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Huge error message when worksheet contains plots #193

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Huge error message when worksheet contains plots#193
@fabriziojpiva

Description

@fabriziojpiva
fabriziojpiva
opened on Nov 25, 2017

Hi everyone, I was using ein as usual and it was working everything fine until I wanted to plot some graphics. If the worksheet does not have any plot, it works fine, but when trying to excecute my code with C-c C-c:

from sklearn.datasets import make_classification, make_blobs
from matplotlib.colors import ListedColormap
from sklearn.datasets import load_breast_cancer
from adspy_shared_utilities import load_crime_dataset

cmap_bold = ListedColormap(['#FFFF00', '#00FF00', '#0000FF','#000000'])


# synthetic dataset for simple regression
from sklearn.datasets import make_regression
plt.figure()
plt.title('Sample regression problem with one input variable')
X_R1, y_R1 = make_regression(n_samples = 100, n_features=1,
                            n_informative=1, bias = 150.0,
                            noise = 30, random_state=0)
plt.scatter(X_R1, y_R1, marker= 'o', s=50)
plt.show()


# synthetic dataset for more complex regression
from sklearn.datasets import make_friedman1
plt.figure()
plt.title('Complex regression problem with one input variable')
X_F1, y_F1 = make_friedman1(n_samples = 100,
                           n_features = 7, random_state=0)

plt.scatter(X_F1[:, 2], y_F1, marker= 'o', s=50)
plt.show()

# synthetic dataset for classification (binary) 
plt.figure()
plt.title('Sample binary classification problem with two informative features')
X_C2, y_C2 = make_classification(n_samples = 100, n_features=2,
                                n_redundant=0, n_informative=2,
                                n_clusters_per_class=1, flip_y = 0.1,
                                class_sep = 0.5, random_state=0)
plt.scatter(X_C2[:, 0], X_C2[:, 1], c=y_C2,
           marker= 'o', s=50, cmap=cmap_bold)
plt.show()
# more difficult synthetic dataset for classification (binary) 
# with classes that are not linearly separable
X_D2, y_D2 = make_blobs(n_samples = 100, n_features = 2, centers = 8,
                       cluster_std = 1.3, random_state = 4)
y_D2 = y_D2 % 2
plt.figure()
plt.title('Sample binary classification problem with non-linearly separable classes')
plt.scatter(X_D2[:,0], X_D2[:,1], c=y_D2,
           marker= 'o', s=50, cmap=cmap_bold)
plt.show()


# Breast cancer dataset for classification
cancer = load_breast_cancer()
(X_cancer, y_cancer) = load_breast_cancer(return_X_y = True)


# Communities and Crime dataset
(X_crime, y_crime) = load_crime_dataset()

EIN plots fine but in counterpart I get this huge and annoying message:

/* Put everything inside the global mpl namespace */
window.mpl = {};

mpl.get_websocket_type = function() {
if (typeof(WebSocket) !== 'undefined') {
return WebSocket;
} else if (typeof(MozWebSocket) !== 'undefined') {
return MozWebSocket;
} else {
alert('Your browser does not have WebSocket support.' +
'Please try Chrome, Safari or Firefox ≥ 6. ' +
'Firefox 4 and 5 are also supported but you ' +
'have to enable WebSockets in about:config.');
};
}

mpl.figure = function(figure_id, websocket, ondownload, parent_element) {
this.id = figure_id;

this.ws = websocket;

this.supports_binary = (this.ws.binaryType != undefined);

if (!this.supports_binary) {
    var warnings = document.getElementById("mpl-warnings");
    if (warnings) {
        warnings.style.display = 'block';
        warnings.textContent = (
            "This browser does not support binary websocket messages. " +
                "Performance may be slow.");
    }
}

this.imageObj = new Image();

this.context = undefined;
this.message = undefined;
this.canvas = undefined;
this.rubberband_canvas = undefined;
this.rubberband_context = undefined;
this.format_dropdown = undefined;

this.image_mode = 'full';

this.root = $('<div/>');
this._root_extra_style(this.root)
this.root.attr('style', 'display: inline-block');

$(parent_element).append(this.root);

this._init_header(this);
this._init_canvas(this);
this._init_toolbar(this);

var fig = this;

this.waiting = false;

this.ws.onopen =  function () {
        fig.send_message("supports_binary", {value: fig.supports_binary});
        fig.send_message("send_image_mode", {});
        if (mpl.ratio != 1) {
            fig.send_message("set_dpi_ratio", {'dpi_ratio': mpl.ratio});
        }
        fig.send_message("refresh", {});
    }

this.imageObj.onload = function() {
        if (fig.image_mode == 'full') {
            // Full images could contain transparency (where diff images
            // almost always do), so we need to clear the canvas so that
            // there is no ghosting.
            fig.context.clearRect(0, 0, fig.canvas.width, fig.canvas.height);
        }
        fig.context.drawImage(fig.imageObj, 0, 0);
    };

this.imageObj.onunload = function() {
    fig.ws.close();
}

this.ws.onmessage = this._make_on_message_function(this);

this.ondownload = ondownload;

}

mpl.figure.prototype._init_header = function() {
var titlebar = $(
'

');
var titletext = $(
'
');
titlebar.append(titletext)
this.root.append(titlebar);
this.header = titletext[0];
}

mpl.figure.prototype._canvas_extra_style = function(canvas_div) {

}

mpl.figure.prototype._root_extra_style = function(canvas_div) {

}

mpl.figure.prototype._init_canvas = function() {
var fig = this;

var canvas_div = $('<div/>');

canvas_div.attr('style', 'position: relative; clear: both; outline: 0');

function canvas_keyboard_event(event) {
    return fig.key_event(event, event['data']);
}

canvas_div.keydown('key_press', canvas_keyboard_event);
canvas_div.keyup('key_release', canvas_keyboard_event);
this.canvas_div = canvas_div
this._canvas_extra_style(canvas_div)
this.root.append(canvas_div);

var canvas = $('<canvas/>');
canvas.addClass('mpl-canvas');
canvas.attr('style', "left: 0; top: 0; z-index: 0; outline: 0")

this.canvas = canvas[0];
this.context = canvas[0].getContext("2d");

var backingStore = this.context.backingStorePixelRatio ||

this.context.webkitBackingStorePixelRatio ||
this.context.mozBackingStorePixelRatio ||
this.context.msBackingStorePixelRatio ||
this.context.oBackingStorePixelRatio ||
this.context.backingStorePixelRatio || 1;

mpl.ratio = (window.devicePixelRatio || 1) / backingStore;

var rubberband = $('<canvas/>');
rubberband.attr('style', "position: absolute; left: 0; top: 0; z-index: 1;")

var pass_mouse_events = true;

canvas_div.resizable({
    start: function(event, ui) {
        pass_mouse_events = false;
    },
    resize: function(event, ui) {
        fig.request_resize(ui.size.width, ui.size.height);
    },
    stop: function(event, ui) {
        pass_mouse_events = true;
        fig.request_resize(ui.size.width, ui.size.height);
    },
});

function mouse_event_fn(event) {
    if (pass_mouse_events)
        return fig.mouse_event(event, event['data']);
}

rubberband.mousedown('button_press', mouse_event_fn);
rubberband.mouseup('button_release', mouse_event_fn);
// Throttle sequential mouse events to 1 every 20ms.
rubberband.mousemove('motion_notify', mouse_event_fn);

rubberband.mouseenter('figure_enter', mouse_event_fn);
rubberband.mouseleave('figure_leave', mouse_event_fn);

canvas_div.on("wheel", function (event) {
    event = event.originalEvent;
    event['data'] = 'scroll'
    if (event.deltaY < 0) {
        event.step = 1;
    } else {
        event.step = -1;
    }
    mouse_event_fn(event);
});

canvas_div.append(canvas);
canvas_div.append(rubberband);

this.rubberband = rubberband;
this.rubberband_canvas = rubberband[0];
this.rubberband_context = rubberband[0].getContext("2d");
this.rubberband_context.strokeStyle = "#000000";

this._resize_canvas = function(width, height) {
    // Keep the size of the canvas, canvas container, and rubber band
    // canvas in synch.
    canvas_div.css('width', width)
    canvas_div.css('height', height)

    canvas.attr('width', width * mpl.ratio);
    canvas.attr('height', height * mpl.ratio);
    canvas.attr('style', 'width: ' + width + 'px; height: ' + height + 'px;');

    rubberband.attr('width', width);
    rubberband.attr('height', height);
}

// Set the figure to an initial 600x600px, this will subsequently be updated
// upon first draw.
this._resize_canvas(600, 600);

// Disable right mouse context menu.
$(this.rubberband_canvas).bind("contextmenu",function(e){
    return false;
});

function set_focus () {
    canvas.focus();
    canvas_div.focus();
}

window.setTimeout(set_focus, 100);

}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items) {
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) {
        // put a spacer in here.
        continue;
    }
    var button = $('<button/>');
    button.addClass('ui-button ui-widget ui-state-default ui-corner-all ' +
                    'ui-button-icon-only');
    button.attr('role', 'button');
    button.attr('aria-disabled', 'false');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);

    var icon_img = $('<span/>');
    icon_img.addClass('ui-button-icon-primary ui-icon');
    icon_img.addClass(image);
    icon_img.addClass('ui-corner-all');

    var tooltip_span = $('<span/>');
    tooltip_span.addClass('ui-button-text');
    tooltip_span.html(tooltip);

    button.append(icon_img);
    button.append(tooltip_span);

    nav_element.append(button);
}

var fmt_picker_span = $('<span/>');

var fmt_picker = $('<select/>');
fmt_picker.addClass('mpl-toolbar-option ui-widget ui-widget-content');
fmt_picker_span.append(fmt_picker);
nav_element.append(fmt_picker_span);
this.format_dropdown = fmt_picker[0];

for (var ind in mpl.extensions) {
    var fmt = mpl.extensions[ind];
    var option = $(
        '<option/>', {selected: fmt === mpl.default_extension}).html(fmt);
    fmt_picker.append(option)
}

// Add hover states to the ui-buttons
$( ".ui-button" ).hover(
    function() { $(this).addClass("ui-state-hover");},
    function() { $(this).removeClass("ui-state-hover");}
);

var status_bar = $('<span class="mpl-message"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

}

mpl.figure.prototype.request_resize = function(x_pixels, y_pixels) {
// Request matplotlib to resize the figure. Matplotlib will then trigger a resize in the client,
// which will in turn request a refresh of the image.
this.send_message('resize', {'width': x_pixels, 'height': y_pixels});
}

mpl.figure.prototype.send_message = function(type, properties) {
properties['type'] = type;
properties['figure_id'] = this.id;
this.ws.send(JSON.stringify(properties));
}

mpl.figure.prototype.send_draw_message = function() {
if (!this.waiting) {
this.waiting = true;
this.ws.send(JSON.stringify({type: "draw", figure_id: this.id}));
}
}

mpl.figure.prototype.handle_save = function(fig, msg) {
var format_dropdown = fig.format_dropdown;
var format = format_dropdown.options[format_dropdown.selectedIndex].value;
fig.ondownload(fig, format);
}

mpl.figure.prototype.handle_resize = function(fig, msg) {
var size = msg['size'];
if (size[0] != fig.canvas.width || size[1] != fig.canvas.height) {
fig._resize_canvas(size[0], size[1]);
fig.send_message("refresh", {});
};
}

mpl.figure.prototype.handle_rubberband = function(fig, msg) {
var x0 = msg['x0'] / mpl.ratio;
var y0 = (fig.canvas.height - msg['y0']) / mpl.ratio;
var x1 = msg['x1'] / mpl.ratio;
var y1 = (fig.canvas.height - msg['y1']) / mpl.ratio;
x0 = Math.floor(x0) + 0.5;
y0 = Math.floor(y0) + 0.5;
x1 = Math.floor(x1) + 0.5;
y1 = Math.floor(y1) + 0.5;
var min_x = Math.min(x0, x1);
var min_y = Math.min(y0, y1);
var width = Math.abs(x1 - x0);
var height = Math.abs(y1 - y0);

fig.rubberband_context.clearRect(
    0, 0, fig.canvas.width, fig.canvas.height);

fig.rubberband_context.strokeRect(min_x, min_y, width, height);

}

mpl.figure.prototype.handle_figure_label = function(fig, msg) {
// Updates the figure title.
fig.header.textContent = msg['label'];
}

mpl.figure.prototype.handle_cursor = function(fig, msg) {
var cursor = msg['cursor'];
switch(cursor)
{
case 0:
cursor = 'pointer';
break;
case 1:
cursor = 'default';
break;
case 2:
cursor = 'crosshair';
break;
case 3:
cursor = 'move';
break;
}
fig.rubberband_canvas.style.cursor = cursor;
}

mpl.figure.prototype.handle_message = function(fig, msg) {
fig.message.textContent = msg['message'];
}

mpl.figure.prototype.handle_draw = function(fig, msg) {
// Request the server to send over a new figure.
fig.send_draw_message();
}

mpl.figure.prototype.handle_image_mode = function(fig, msg) {
fig.image_mode = msg['mode'];
}

mpl.figure.prototype.updated_canvas_event = function() {
// Called whenever the canvas gets updated.
this.send_message("ack", {});
}

// A function to construct a web socket function for onmessage handling.
// Called in the figure constructor.
mpl.figure.prototype._make_on_message_function = function(fig) {
return function socket_on_message(evt) {
if (evt.data instanceof Blob) {
/* FIXME: We get "Resource interpreted as Image but
* transferred with MIME type text/plain:" errors on
* Chrome. But how to set the MIME type? It doesn't seem
* to be part of the websocket stream */
evt.data.type = "image/png";

        /* Free the memory for the previous frames */
        if (fig.imageObj.src) {
            (window.URL || window.webkitURL).revokeObjectURL(
                fig.imageObj.src);
        }

        fig.imageObj.src = (window.URL || window.webkitURL).createObjectURL(
            evt.data);
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }
    else if (typeof evt.data === 'string' && evt.data.slice(0, 21) == "data:image/png;base64") {
        fig.imageObj.src = evt.data;
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }

    var msg = JSON.parse(evt.data);
    var msg_type = msg['type'];

    // Call the  "handle_{type}" callback, which takes
    // the figure and JSON message as its only arguments.
    try {
        var callback = fig["handle_" + msg_type];
    } catch (e) {
        console.log("No handler for the '" + msg_type + "' message type: ", msg);
        return;
    }

    if (callback) {
        try {
            // console.log("Handling '" + msg_type + "' message: ", msg);
            callback(fig, msg);
        } catch (e) {
            console.log("Exception inside the 'handler_" + msg_type + "' callback:", e, e.stack, msg);
        }
    }
};

}

// from http://stackoverflow.com/questions/1114465/getting-mouse-location-in-canvas
mpl.findpos = function(e) {
//this section is from http://www.quirksmode.org/js/events_properties.html
var targ;
if (!e)
e = window.event;
if (e.target)
targ = e.target;
else if (e.srcElement)
targ = e.srcElement;
if (targ.nodeType == 3) // defeat Safari bug
targ = targ.parentNode;

// jQuery normalizes the pageX and pageY
// pageX,Y are the mouse positions relative to the document
// offset() returns the position of the element relative to the document
var x = e.pageX - $(targ).offset().left;
var y = e.pageY - $(targ).offset().top;

return {"x": x, "y": y};

};

/*

  • return a copy of an object with only non-object keys
  • we need this to avoid circular references
  • http://stackoverflow.com/a/24161582/3208463
    */
    function simpleKeys (original) {
    return Object.keys(original).reduce(function (obj, key) {
    if (typeof original[key] !== 'object')
    obj[key] = original[key]
    return obj;
    }, {});
    }

mpl.figure.prototype.mouse_event = function(event, name) {
var canvas_pos = mpl.findpos(event)

if (name === 'button_press')
{
    this.canvas.focus();
    this.canvas_div.focus();
}

var x = canvas_pos.x * mpl.ratio;
var y = canvas_pos.y * mpl.ratio;

this.send_message(name, {x: x, y: y, button: event.button,
                         step: event.step,
                         guiEvent: simpleKeys(event)});

/* This prevents the web browser from automatically changing to
 * the text insertion cursor when the button is pressed.  We want
 * to control all of the cursor setting manually through the
 * 'cursor' event from matplotlib */
event.preventDefault();
return false;

}

mpl.figure.prototype._key_event_extra = function(event, name) {
// Handle any extra behaviour associated with a key event
}

mpl.figure.prototype.key_event = function(event, name) {

// Prevent repeat events
if (name == 'key_press')
{
    if (event.which === this._key)
        return;
    else
        this._key = event.which;
}
if (name == 'key_release')
    this._key = null;

var value = '';
if (event.ctrlKey && event.which != 17)
    value += "ctrl+";
if (event.altKey && event.which != 18)
    value += "alt+";
if (event.shiftKey && event.which != 16)
    value += "shift+";

value += 'k';
value += event.which.toString();

this._key_event_extra(event, name);

this.send_message(name, {key: value,
                         guiEvent: simpleKeys(event)});
return false;

}

mpl.figure.prototype.toolbar_button_onclick = function(name) {
if (name == 'download') {
this.handle_save(this, null);
} else {
this.send_message("toolbar_button", {name: name});
}
};

mpl.figure.prototype.toolbar_button_onmouseover = function(tooltip) {
this.message.textContent = tooltip;
};
mpl.toolbar_items = [["Home", "Reset original view", "fa fa-home icon-home", "home"], ["Back", "Back to previous view", "fa fa-arrow-left icon-arrow-left", "back"], ["Forward", "Forward to next view", "fa fa-arrow-right icon-arrow-right", "forward"], ["", "", "", ""], ["Pan", "Pan axes with left mouse, zoom with right", "fa fa-arrows icon-move", "pan"], ["Zoom", "Zoom to rectangle", "fa fa-square-o icon-check-empty", "zoom"], ["", "", "", ""], ["Download", "Download plot", "fa fa-floppy-o icon-save", "download"]];

mpl.extensions = ["eps", "pdf", "png", "ps", "raw", "svg"];

mpl.default_extension = "png";var comm_websocket_adapter = function(comm) {
// Create a "websocket"-like object which calls the given IPython comm
// object with the appropriate methods. Currently this is a non binary
// socket, so there is still some room for performance tuning.
var ws = {};

ws.close = function() {
    comm.close()
};
ws.send = function(m) {
    //console.log('sending', m);
    comm.send(m);
};
// Register the callback with on_msg.
comm.on_msg(function(msg) {
    //console.log('receiving', msg['content']['data'], msg);
    // Pass the mpl event to the overriden (by mpl) onmessage function.
    ws.onmessage(msg['content']['data'])
});
return ws;

}

mpl.mpl_figure_comm = function(comm, msg) {
// This is the function which gets called when the mpl process
// starts-up an IPython Comm through the "matplotlib" channel.

var id = msg.content.data.id;
// Get hold of the div created by the display call when the Comm
// socket was opened in Python.
var element = $("#" + id);
var ws_proxy = comm_websocket_adapter(comm)

function ondownload(figure, format) {
    window.open(figure.imageObj.src);
}

var fig = new mpl.figure(id, ws_proxy,
                       ondownload,
                       element.get(0));

// Call onopen now - mpl needs it, as it is assuming we've passed it a real
// web socket which is closed, not our websocket->open comm proxy.
ws_proxy.onopen();

fig.parent_element = element.get(0);
fig.cell_info = mpl.find_output_cell("<div id='" + id + "'></div>");
if (!fig.cell_info) {
    console.error("Failed to find cell for figure", id, fig);
    return;
}

var output_index = fig.cell_info[2]
var cell = fig.cell_info[0];

};

mpl.figure.prototype.handle_close = function(fig, msg) {
var width = fig.canvas.width/mpl.ratio
fig.root.unbind('remove')

// Update the output cell to use the data from the current canvas.
fig.push_to_output();
var dataURL = fig.canvas.toDataURL();
// Re-enable the keyboard manager in IPython - without this line, in FF,
// the notebook keyboard shortcuts fail.
IPython.keyboard_manager.enable()
$(fig.parent_element).html('<img src="' + dataURL + '" width="' + width + '">');
fig.close_ws(fig, msg);

}

mpl.figure.prototype.close_ws = function(fig, msg){
fig.send_message('closing', msg);
// fig.ws.close()
}

mpl.figure.prototype.push_to_output = function(remove_interactive) {
// Turn the data on the canvas into data in the output cell.
var width = this.canvas.width/mpl.ratio
var dataURL = this.canvas.toDataURL();
this.cell_info[1]['text/html'] = '';
}

mpl.figure.prototype.updated_canvas_event = function() {
// Tell IPython that the notebook contents must change.
IPython.notebook.set_dirty(true);
this.send_message("ack", {});
var fig = this;
// Wait a second, then push the new image to the DOM so
// that it is saved nicely (might be nice to debounce this).
setTimeout(function () { fig.push_to_output() }, 1000);
}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items){
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) { continue; };

    var button = $('<button class="btn btn-default" href="#" title="' + name + '"><i class="fa ' + image + ' fa-lg"></i></button>');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);
    nav_element.append(button);
}

// Add the status bar.
var status_bar = $('<span class="mpl-message" style="text-align:right; float: right;"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

// Add the close button to the window.
var buttongrp = $('<div class="btn-group inline pull-right"></div>');
var button = $('<button class="btn btn-mini btn-primary" href="#" title="Stop Interaction"><i class="fa fa-power-off icon-remove icon-large"></i></button>');
button.click(function (evt) { fig.handle_close(fig, {}); } );
button.mouseover('Stop Interaction', toolbar_mouse_event);
buttongrp.append(button);
var titlebar = this.root.find($('.ui-dialog-titlebar'));
titlebar.prepend(buttongrp);

}

mpl.figure.prototype._root_extra_style = function(el){
var fig = this
el.on("remove", function(){
fig.close_ws(fig, {});
});
}

mpl.figure.prototype._canvas_extra_style = function(el){
// this is important to make the div 'focusable
el.attr('tabindex', 0)
// reach out to IPython and tell the keyboard manager to turn it's self
// off when our div gets focus

// location in version 3
if (IPython.notebook.keyboard_manager) {
    IPython.notebook.keyboard_manager.register_events(el);
}
else {
    // location in version 2
    IPython.keyboard_manager.register_events(el);
}

}

mpl.figure.prototype._key_event_extra = function(event, name) {
var manager = IPython.notebook.keyboard_manager;
if (!manager)
manager = IPython.keyboard_manager;

// Check for shift+enter
if (event.shiftKey && event.which == 13) {
    this.canvas_div.blur();
    event.shiftKey = false;
    // Send a "J" for go to next cell
    event.which = 74;
    event.keyCode = 74;
    manager.command_mode();
    manager.handle_keydown(event);
}

}

mpl.figure.prototype.handle_save = function(fig, msg) {
fig.ondownload(fig, null);
}

mpl.find_output_cell = function(html_output) {
// Return the cell and output element which can be found uniquely in the notebook.
// Note - this is a bit hacky, but it is done because the "notebook_saving.Notebook"
// IPython event is triggered only after the cells have been serialised, which for
// our purposes (turning an active figure into a static one), is too late.
var cells = IPython.notebook.get_cells();
var ncells = cells.length;
for (var i=0; i<ncells; i++) {
var cell = cells[i];
if (cell.cell_type === 'code'){
for (var j=0; j<cell.output_area.outputs.length; j++) {
var data = cell.output_area.outputs[j];
if (data.data) {
// IPython >= 3 moved mimebundle to data attribute of output
data = data.data;
}
if (data['text/html'] == html_output) {
return [cell, data, j];
}
}
}
}
}

// Register the function which deals with the matplotlib target/channel.
// The kernel may be null if the page has been refreshed.
if (IPython.notebook.kernel != null) {
IPython.notebook.kernel.comm_manager.register_target('matplotlib', mpl.mpl_figure_comm);
}

/* Put everything inside the global mpl namespace */
window.mpl = {};

mpl.get_websocket_type = function() {
if (typeof(WebSocket) !== 'undefined') {
return WebSocket;
} else if (typeof(MozWebSocket) !== 'undefined') {
return MozWebSocket;
} else {
alert('Your browser does not have WebSocket support.' +
'Please try Chrome, Safari or Firefox ≥ 6. ' +
'Firefox 4 and 5 are also supported but you ' +
'have to enable WebSockets in about:config.');
};
}

mpl.figure = function(figure_id, websocket, ondownload, parent_element) {
this.id = figure_id;

this.ws = websocket;

this.supports_binary = (this.ws.binaryType != undefined);

if (!this.supports_binary) {
    var warnings = document.getElementById("mpl-warnings");
    if (warnings) {
        warnings.style.display = 'block';
        warnings.textContent = (
            "This browser does not support binary websocket messages. " +
                "Performance may be slow.");
    }
}

this.imageObj = new Image();

this.context = undefined;
this.message = undefined;
this.canvas = undefined;
this.rubberband_canvas = undefined;
this.rubberband_context = undefined;
this.format_dropdown = undefined;

this.image_mode = 'full';

this.root = $('<div/>');
this._root_extra_style(this.root)
this.root.attr('style', 'display: inline-block');

$(parent_element).append(this.root);

this._init_header(this);
this._init_canvas(this);
this._init_toolbar(this);

var fig = this;

this.waiting = false;

this.ws.onopen =  function () {
        fig.send_message("supports_binary", {value: fig.supports_binary});
        fig.send_message("send_image_mode", {});
        if (mpl.ratio != 1) {
            fig.send_message("set_dpi_ratio", {'dpi_ratio': mpl.ratio});
        }
        fig.send_message("refresh", {});
    }

this.imageObj.onload = function() {
        if (fig.image_mode == 'full') {
            // Full images could contain transparency (where diff images
            // almost always do), so we need to clear the canvas so that
            // there is no ghosting.
            fig.context.clearRect(0, 0, fig.canvas.width, fig.canvas.height);
        }
        fig.context.drawImage(fig.imageObj, 0, 0);
    };

this.imageObj.onunload = function() {
    fig.ws.close();
}

this.ws.onmessage = this._make_on_message_function(this);

this.ondownload = ondownload;

}

mpl.figure.prototype._init_header = function() {
var titlebar = $(
'

');
var titletext = $(
'
');
titlebar.append(titletext)
this.root.append(titlebar);
this.header = titletext[0];
}

mpl.figure.prototype._canvas_extra_style = function(canvas_div) {

}

mpl.figure.prototype._root_extra_style = function(canvas_div) {

}

mpl.figure.prototype._init_canvas = function() {
var fig = this;

var canvas_div = $('<div/>');

canvas_div.attr('style', 'position: relative; clear: both; outline: 0');

function canvas_keyboard_event(event) {
    return fig.key_event(event, event['data']);
}

canvas_div.keydown('key_press', canvas_keyboard_event);
canvas_div.keyup('key_release', canvas_keyboard_event);
this.canvas_div = canvas_div
this._canvas_extra_style(canvas_div)
this.root.append(canvas_div);

var canvas = $('<canvas/>');
canvas.addClass('mpl-canvas');
canvas.attr('style', "left: 0; top: 0; z-index: 0; outline: 0")

this.canvas = canvas[0];
this.context = canvas[0].getContext("2d");

var backingStore = this.context.backingStorePixelRatio ||

this.context.webkitBackingStorePixelRatio ||
this.context.mozBackingStorePixelRatio ||
this.context.msBackingStorePixelRatio ||
this.context.oBackingStorePixelRatio ||
this.context.backingStorePixelRatio || 1;

mpl.ratio = (window.devicePixelRatio || 1) / backingStore;

var rubberband = $('<canvas/>');
rubberband.attr('style', "position: absolute; left: 0; top: 0; z-index: 1;")

var pass_mouse_events = true;

canvas_div.resizable({
    start: function(event, ui) {
        pass_mouse_events = false;
    },
    resize: function(event, ui) {
        fig.request_resize(ui.size.width, ui.size.height);
    },
    stop: function(event, ui) {
        pass_mouse_events = true;
        fig.request_resize(ui.size.width, ui.size.height);
    },
});

function mouse_event_fn(event) {
    if (pass_mouse_events)
        return fig.mouse_event(event, event['data']);
}

rubberband.mousedown('button_press', mouse_event_fn);
rubberband.mouseup('button_release', mouse_event_fn);
// Throttle sequential mouse events to 1 every 20ms.
rubberband.mousemove('motion_notify', mouse_event_fn);

rubberband.mouseenter('figure_enter', mouse_event_fn);
rubberband.mouseleave('figure_leave', mouse_event_fn);

canvas_div.on("wheel", function (event) {
    event = event.originalEvent;
    event['data'] = 'scroll'
    if (event.deltaY < 0) {
        event.step = 1;
    } else {
        event.step = -1;
    }
    mouse_event_fn(event);
});

canvas_div.append(canvas);
canvas_div.append(rubberband);

this.rubberband = rubberband;
this.rubberband_canvas = rubberband[0];
this.rubberband_context = rubberband[0].getContext("2d");
this.rubberband_context.strokeStyle = "#000000";

this._resize_canvas = function(width, height) {
    // Keep the size of the canvas, canvas container, and rubber band
    // canvas in synch.
    canvas_div.css('width', width)
    canvas_div.css('height', height)

    canvas.attr('width', width * mpl.ratio);
    canvas.attr('height', height * mpl.ratio);
    canvas.attr('style', 'width: ' + width + 'px; height: ' + height + 'px;');

    rubberband.attr('width', width);
    rubberband.attr('height', height);
}

// Set the figure to an initial 600x600px, this will subsequently be updated
// upon first draw.
this._resize_canvas(600, 600);

// Disable right mouse context menu.
$(this.rubberband_canvas).bind("contextmenu",function(e){
    return false;
});

function set_focus () {
    canvas.focus();
    canvas_div.focus();
}

window.setTimeout(set_focus, 100);

}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items) {
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) {
        // put a spacer in here.
        continue;
    }
    var button = $('<button/>');
    button.addClass('ui-button ui-widget ui-state-default ui-corner-all ' +
                    'ui-button-icon-only');
    button.attr('role', 'button');
    button.attr('aria-disabled', 'false');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);

    var icon_img = $('<span/>');
    icon_img.addClass('ui-button-icon-primary ui-icon');
    icon_img.addClass(image);
    icon_img.addClass('ui-corner-all');

    var tooltip_span = $('<span/>');
    tooltip_span.addClass('ui-button-text');
    tooltip_span.html(tooltip);

    button.append(icon_img);
    button.append(tooltip_span);

    nav_element.append(button);
}

var fmt_picker_span = $('<span/>');

var fmt_picker = $('<select/>');
fmt_picker.addClass('mpl-toolbar-option ui-widget ui-widget-content');
fmt_picker_span.append(fmt_picker);
nav_element.append(fmt_picker_span);
this.format_dropdown = fmt_picker[0];

for (var ind in mpl.extensions) {
    var fmt = mpl.extensions[ind];
    var option = $(
        '<option/>', {selected: fmt === mpl.default_extension}).html(fmt);
    fmt_picker.append(option)
}

// Add hover states to the ui-buttons
$( ".ui-button" ).hover(
    function() { $(this).addClass("ui-state-hover");},
    function() { $(this).removeClass("ui-state-hover");}
);

var status_bar = $('<span class="mpl-message"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

}

mpl.figure.prototype.request_resize = function(x_pixels, y_pixels) {
// Request matplotlib to resize the figure. Matplotlib will then trigger a resize in the client,
// which will in turn request a refresh of the image.
this.send_message('resize', {'width': x_pixels, 'height': y_pixels});
}

mpl.figure.prototype.send_message = function(type, properties) {
properties['type'] = type;
properties['figure_id'] = this.id;
this.ws.send(JSON.stringify(properties));
}

mpl.figure.prototype.send_draw_message = function() {
if (!this.waiting) {
this.waiting = true;
this.ws.send(JSON.stringify({type: "draw", figure_id: this.id}));
}
}

mpl.figure.prototype.handle_save = function(fig, msg) {
var format_dropdown = fig.format_dropdown;
var format = format_dropdown.options[format_dropdown.selectedIndex].value;
fig.ondownload(fig, format);
}

mpl.figure.prototype.handle_resize = function(fig, msg) {
var size = msg['size'];
if (size[0] != fig.canvas.width || size[1] != fig.canvas.height) {
fig._resize_canvas(size[0], size[1]);
fig.send_message("refresh", {});
};
}

mpl.figure.prototype.handle_rubberband = function(fig, msg) {
var x0 = msg['x0'] / mpl.ratio;
var y0 = (fig.canvas.height - msg['y0']) / mpl.ratio;
var x1 = msg['x1'] / mpl.ratio;
var y1 = (fig.canvas.height - msg['y1']) / mpl.ratio;
x0 = Math.floor(x0) + 0.5;
y0 = Math.floor(y0) + 0.5;
x1 = Math.floor(x1) + 0.5;
y1 = Math.floor(y1) + 0.5;
var min_x = Math.min(x0, x1);
var min_y = Math.min(y0, y1);
var width = Math.abs(x1 - x0);
var height = Math.abs(y1 - y0);

fig.rubberband_context.clearRect(
    0, 0, fig.canvas.width, fig.canvas.height);

fig.rubberband_context.strokeRect(min_x, min_y, width, height);

}

mpl.figure.prototype.handle_figure_label = function(fig, msg) {
// Updates the figure title.
fig.header.textContent = msg['label'];
}

mpl.figure.prototype.handle_cursor = function(fig, msg) {
var cursor = msg['cursor'];
switch(cursor)
{
case 0:
cursor = 'pointer';
break;
case 1:
cursor = 'default';
break;
case 2:
cursor = 'crosshair';
break;
case 3:
cursor = 'move';
break;
}
fig.rubberband_canvas.style.cursor = cursor;
}

mpl.figure.prototype.handle_message = function(fig, msg) {
fig.message.textContent = msg['message'];
}

mpl.figure.prototype.handle_draw = function(fig, msg) {
// Request the server to send over a new figure.
fig.send_draw_message();
}

mpl.figure.prototype.handle_image_mode = function(fig, msg) {
fig.image_mode = msg['mode'];
}

mpl.figure.prototype.updated_canvas_event = function() {
// Called whenever the canvas gets updated.
this.send_message("ack", {});
}

// A function to construct a web socket function for onmessage handling.
// Called in the figure constructor.
mpl.figure.prototype._make_on_message_function = function(fig) {
return function socket_on_message(evt) {
if (evt.data instanceof Blob) {
/* FIXME: We get "Resource interpreted as Image but
* transferred with MIME type text/plain:" errors on
* Chrome. But how to set the MIME type? It doesn't seem
* to be part of the websocket stream */
evt.data.type = "image/png";

        /* Free the memory for the previous frames */
        if (fig.imageObj.src) {
            (window.URL || window.webkitURL).revokeObjectURL(
                fig.imageObj.src);
        }

        fig.imageObj.src = (window.URL || window.webkitURL).createObjectURL(
            evt.data);
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }
    else if (typeof evt.data === 'string' && evt.data.slice(0, 21) == "data:image/png;base64") {
        fig.imageObj.src = evt.data;
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }

    var msg = JSON.parse(evt.data);
    var msg_type = msg['type'];

    // Call the  "handle_{type}" callback, which takes
    // the figure and JSON message as its only arguments.
    try {
        var callback = fig["handle_" + msg_type];
    } catch (e) {
        console.log("No handler for the '" + msg_type + "' message type: ", msg);
        return;
    }

    if (callback) {
        try {
            // console.log("Handling '" + msg_type + "' message: ", msg);
            callback(fig, msg);
        } catch (e) {
            console.log("Exception inside the 'handler_" + msg_type + "' callback:", e, e.stack, msg);
        }
    }
};

}

// from http://stackoverflow.com/questions/1114465/getting-mouse-location-in-canvas
mpl.findpos = function(e) {
//this section is from http://www.quirksmode.org/js/events_properties.html
var targ;
if (!e)
e = window.event;
if (e.target)
targ = e.target;
else if (e.srcElement)
targ = e.srcElement;
if (targ.nodeType == 3) // defeat Safari bug
targ = targ.parentNode;

// jQuery normalizes the pageX and pageY
// pageX,Y are the mouse positions relative to the document
// offset() returns the position of the element relative to the document
var x = e.pageX - $(targ).offset().left;
var y = e.pageY - $(targ).offset().top;

return {"x": x, "y": y};

};

/*

  • return a copy of an object with only non-object keys
  • we need this to avoid circular references
  • http://stackoverflow.com/a/24161582/3208463
    */
    function simpleKeys (original) {
    return Object.keys(original).reduce(function (obj, key) {
    if (typeof original[key] !== 'object')
    obj[key] = original[key]
    return obj;
    }, {});
    }

mpl.figure.prototype.mouse_event = function(event, name) {
var canvas_pos = mpl.findpos(event)

if (name === 'button_press')
{
    this.canvas.focus();
    this.canvas_div.focus();
}

var x = canvas_pos.x * mpl.ratio;
var y = canvas_pos.y * mpl.ratio;

this.send_message(name, {x: x, y: y, button: event.button,
                         step: event.step,
                         guiEvent: simpleKeys(event)});

/* This prevents the web browser from automatically changing to
 * the text insertion cursor when the button is pressed.  We want
 * to control all of the cursor setting manually through the
 * 'cursor' event from matplotlib */
event.preventDefault();
return false;

}

mpl.figure.prototype._key_event_extra = function(event, name) {
// Handle any extra behaviour associated with a key event
}

mpl.figure.prototype.key_event = function(event, name) {

// Prevent repeat events
if (name == 'key_press')
{
    if (event.which === this._key)
        return;
    else
        this._key = event.which;
}
if (name == 'key_release')
    this._key = null;

var value = '';
if (event.ctrlKey && event.which != 17)
    value += "ctrl+";
if (event.altKey && event.which != 18)
    value += "alt+";
if (event.shiftKey && event.which != 16)
    value += "shift+";

value += 'k';
value += event.which.toString();

this._key_event_extra(event, name);

this.send_message(name, {key: value,
                         guiEvent: simpleKeys(event)});
return false;

}

mpl.figure.prototype.toolbar_button_onclick = function(name) {
if (name == 'download') {
this.handle_save(this, null);
} else {
this.send_message("toolbar_button", {name: name});
}
};

mpl.figure.prototype.toolbar_button_onmouseover = function(tooltip) {
this.message.textContent = tooltip;
};
mpl.toolbar_items = [["Home", "Reset original view", "fa fa-home icon-home", "home"], ["Back", "Back to previous view", "fa fa-arrow-left icon-arrow-left", "back"], ["Forward", "Forward to next view", "fa fa-arrow-right icon-arrow-right", "forward"], ["", "", "", ""], ["Pan", "Pan axes with left mouse, zoom with right", "fa fa-arrows icon-move", "pan"], ["Zoom", "Zoom to rectangle", "fa fa-square-o icon-check-empty", "zoom"], ["", "", "", ""], ["Download", "Download plot", "fa fa-floppy-o icon-save", "download"]];

mpl.extensions = ["eps", "pdf", "png", "ps", "raw", "svg"];

mpl.default_extension = "png";var comm_websocket_adapter = function(comm) {
// Create a "websocket"-like object which calls the given IPython comm
// object with the appropriate methods. Currently this is a non binary
// socket, so there is still some room for performance tuning.
var ws = {};

ws.close = function() {
    comm.close()
};
ws.send = function(m) {
    //console.log('sending', m);
    comm.send(m);
};
// Register the callback with on_msg.
comm.on_msg(function(msg) {
    //console.log('receiving', msg['content']['data'], msg);
    // Pass the mpl event to the overriden (by mpl) onmessage function.
    ws.onmessage(msg['content']['data'])
});
return ws;

}

mpl.mpl_figure_comm = function(comm, msg) {
// This is the function which gets called when the mpl process
// starts-up an IPython Comm through the "matplotlib" channel.

var id = msg.content.data.id;
// Get hold of the div created by the display call when the Comm
// socket was opened in Python.
var element = $("#" + id);
var ws_proxy = comm_websocket_adapter(comm)

function ondownload(figure, format) {
    window.open(figure.imageObj.src);
}

var fig = new mpl.figure(id, ws_proxy,
                       ondownload,
                       element.get(0));

// Call onopen now - mpl needs it, as it is assuming we've passed it a real
// web socket which is closed, not our websocket->open comm proxy.
ws_proxy.onopen();

fig.parent_element = element.get(0);
fig.cell_info = mpl.find_output_cell("<div id='" + id + "'></div>");
if (!fig.cell_info) {
    console.error("Failed to find cell for figure", id, fig);
    return;
}

var output_index = fig.cell_info[2]
var cell = fig.cell_info[0];

};

mpl.figure.prototype.handle_close = function(fig, msg) {
var width = fig.canvas.width/mpl.ratio
fig.root.unbind('remove')

// Update the output cell to use the data from the current canvas.
fig.push_to_output();
var dataURL = fig.canvas.toDataURL();
// Re-enable the keyboard manager in IPython - without this line, in FF,
// the notebook keyboard shortcuts fail.
IPython.keyboard_manager.enable()
$(fig.parent_element).html('<img src="' + dataURL + '" width="' + width + '">');
fig.close_ws(fig, msg);

}

mpl.figure.prototype.close_ws = function(fig, msg){
fig.send_message('closing', msg);
// fig.ws.close()
}

mpl.figure.prototype.push_to_output = function(remove_interactive) {
// Turn the data on the canvas into data in the output cell.
var width = this.canvas.width/mpl.ratio
var dataURL = this.canvas.toDataURL();
this.cell_info[1]['text/html'] = '';
}

mpl.figure.prototype.updated_canvas_event = function() {
// Tell IPython that the notebook contents must change.
IPython.notebook.set_dirty(true);
this.send_message("ack", {});
var fig = this;
// Wait a second, then push the new image to the DOM so
// that it is saved nicely (might be nice to debounce this).
setTimeout(function () { fig.push_to_output() }, 1000);
}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items){
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) { continue; };

    var button = $('<button class="btn btn-default" href="#" title="' + name + '"><i class="fa ' + image + ' fa-lg"></i></button>');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);
    nav_element.append(button);
}

// Add the status bar.
var status_bar = $('<span class="mpl-message" style="text-align:right; float: right;"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

// Add the close button to the window.
var buttongrp = $('<div class="btn-group inline pull-right"></div>');
var button = $('<button class="btn btn-mini btn-primary" href="#" title="Stop Interaction"><i class="fa fa-power-off icon-remove icon-large"></i></button>');
button.click(function (evt) { fig.handle_close(fig, {}); } );
button.mouseover('Stop Interaction', toolbar_mouse_event);
buttongrp.append(button);
var titlebar = this.root.find($('.ui-dialog-titlebar'));
titlebar.prepend(buttongrp);

}

mpl.figure.prototype._root_extra_style = function(el){
var fig = this
el.on("remove", function(){
fig.close_ws(fig, {});
});
}

mpl.figure.prototype._canvas_extra_style = function(el){
// this is important to make the div 'focusable
el.attr('tabindex', 0)
// reach out to IPython and tell the keyboard manager to turn it's self
// off when our div gets focus

// location in version 3
if (IPython.notebook.keyboard_manager) {
    IPython.notebook.keyboard_manager.register_events(el);
}
else {
    // location in version 2
    IPython.keyboard_manager.register_events(el);
}

}

mpl.figure.prototype._key_event_extra = function(event, name) {
var manager = IPython.notebook.keyboard_manager;
if (!manager)
manager = IPython.keyboard_manager;

// Check for shift+enter
if (event.shiftKey && event.which == 13) {
    this.canvas_div.blur();
    event.shiftKey = false;
    // Send a "J" for go to next cell
    event.which = 74;
    event.keyCode = 74;
    manager.command_mode();
    manager.handle_keydown(event);
}

}

mpl.figure.prototype.handle_save = function(fig, msg) {
fig.ondownload(fig, null);
}

mpl.find_output_cell = function(html_output) {
// Return the cell and output element which can be found uniquely in the notebook.
// Note - this is a bit hacky, but it is done because the "notebook_saving.Notebook"
// IPython event is triggered only after the cells have been serialised, which for
// our purposes (turning an active figure into a static one), is too late.
var cells = IPython.notebook.get_cells();
var ncells = cells.length;
for (var i=0; i<ncells; i++) {
var cell = cells[i];
if (cell.cell_type === 'code'){
for (var j=0; j<cell.output_area.outputs.length; j++) {
var data = cell.output_area.outputs[j];
if (data.data) {
// IPython >= 3 moved mimebundle to data attribute of output
data = data.data;
}
if (data['text/html'] == html_output) {
return [cell, data, j];
}
}
}
}
}

// Register the function which deals with the matplotlib target/channel.
// The kernel may be null if the page has been refreshed.
if (IPython.notebook.kernel != null) {
IPython.notebook.kernel.comm_manager.register_target('matplotlib', mpl.mpl_figure_comm);
}

/* Put everything inside the global mpl namespace */
window.mpl = {};

mpl.get_websocket_type = function() {
if (typeof(WebSocket) !== 'undefined') {
return WebSocket;
} else if (typeof(MozWebSocket) !== 'undefined') {
return MozWebSocket;
} else {
alert('Your browser does not have WebSocket support.' +
'Please try Chrome, Safari or Firefox ≥ 6. ' +
'Firefox 4 and 5 are also supported but you ' +
'have to enable WebSockets in about:config.');
};
}

mpl.figure = function(figure_id, websocket, ondownload, parent_element) {
this.id = figure_id;

this.ws = websocket;

this.supports_binary = (this.ws.binaryType != undefined);

if (!this.supports_binary) {
    var warnings = document.getElementById("mpl-warnings");
    if (warnings) {
        warnings.style.display = 'block';
        warnings.textContent = (
            "This browser does not support binary websocket messages. " +
                "Performance may be slow.");
    }
}

this.imageObj = new Image();

this.context = undefined;
this.message = undefined;
this.canvas = undefined;
this.rubberband_canvas = undefined;
this.rubberband_context = undefined;
this.format_dropdown = undefined;

this.image_mode = 'full';

this.root = $('<div/>');
this._root_extra_style(this.root)
this.root.attr('style', 'display: inline-block');

$(parent_element).append(this.root);

this._init_header(this);
this._init_canvas(this);
this._init_toolbar(this);

var fig = this;

this.waiting = false;

this.ws.onopen =  function () {
        fig.send_message("supports_binary", {value: fig.supports_binary});
        fig.send_message("send_image_mode", {});
        if (mpl.ratio != 1) {
            fig.send_message("set_dpi_ratio", {'dpi_ratio': mpl.ratio});
        }
        fig.send_message("refresh", {});
    }

this.imageObj.onload = function() {
        if (fig.image_mode == 'full') {
            // Full images could contain transparency (where diff images
            // almost always do), so we need to clear the canvas so that
            // there is no ghosting.
            fig.context.clearRect(0, 0, fig.canvas.width, fig.canvas.height);
        }
        fig.context.drawImage(fig.imageObj, 0, 0);
    };

this.imageObj.onunload = function() {
    fig.ws.close();
}

this.ws.onmessage = this._make_on_message_function(this);

this.ondownload = ondownload;

}

mpl.figure.prototype._init_header = function() {
var titlebar = $(
'

');
var titletext = $(
'
');
titlebar.append(titletext)
this.root.append(titlebar);
this.header = titletext[0];
}

mpl.figure.prototype._canvas_extra_style = function(canvas_div) {

}

mpl.figure.prototype._root_extra_style = function(canvas_div) {

}

mpl.figure.prototype._init_canvas = function() {
var fig = this;

var canvas_div = $('<div/>');

canvas_div.attr('style', 'position: relative; clear: both; outline: 0');

function canvas_keyboard_event(event) {
    return fig.key_event(event, event['data']);
}

canvas_div.keydown('key_press', canvas_keyboard_event);
canvas_div.keyup('key_release', canvas_keyboard_event);
this.canvas_div = canvas_div
this._canvas_extra_style(canvas_div)
this.root.append(canvas_div);

var canvas = $('<canvas/>');
canvas.addClass('mpl-canvas');
canvas.attr('style', "left: 0; top: 0; z-index: 0; outline: 0")

this.canvas = canvas[0];
this.context = canvas[0].getContext("2d");

var backingStore = this.context.backingStorePixelRatio ||

this.context.webkitBackingStorePixelRatio ||
this.context.mozBackingStorePixelRatio ||
this.context.msBackingStorePixelRatio ||
this.context.oBackingStorePixelRatio ||
this.context.backingStorePixelRatio || 1;

mpl.ratio = (window.devicePixelRatio || 1) / backingStore;

var rubberband = $('<canvas/>');
rubberband.attr('style', "position: absolute; left: 0; top: 0; z-index: 1;")

var pass_mouse_events = true;

canvas_div.resizable({
    start: function(event, ui) {
        pass_mouse_events = false;
    },
    resize: function(event, ui) {
        fig.request_resize(ui.size.width, ui.size.height);
    },
    stop: function(event, ui) {
        pass_mouse_events = true;
        fig.request_resize(ui.size.width, ui.size.height);
    },
});

function mouse_event_fn(event) {
    if (pass_mouse_events)
        return fig.mouse_event(event, event['data']);
}

rubberband.mousedown('button_press', mouse_event_fn);
rubberband.mouseup('button_release', mouse_event_fn);
// Throttle sequential mouse events to 1 every 20ms.
rubberband.mousemove('motion_notify', mouse_event_fn);

rubberband.mouseenter('figure_enter', mouse_event_fn);
rubberband.mouseleave('figure_leave', mouse_event_fn);

canvas_div.on("wheel", function (event) {
    event = event.originalEvent;
    event['data'] = 'scroll'
    if (event.deltaY < 0) {
        event.step = 1;
    } else {
        event.step = -1;
    }
    mouse_event_fn(event);
});

canvas_div.append(canvas);
canvas_div.append(rubberband);

this.rubberband = rubberband;
this.rubberband_canvas = rubberband[0];
this.rubberband_context = rubberband[0].getContext("2d");
this.rubberband_context.strokeStyle = "#000000";

this._resize_canvas = function(width, height) {
    // Keep the size of the canvas, canvas container, and rubber band
    // canvas in synch.
    canvas_div.css('width', width)
    canvas_div.css('height', height)

    canvas.attr('width', width * mpl.ratio);
    canvas.attr('height', height * mpl.ratio);
    canvas.attr('style', 'width: ' + width + 'px; height: ' + height + 'px;');

    rubberband.attr('width', width);
    rubberband.attr('height', height);
}

// Set the figure to an initial 600x600px, this will subsequently be updated
// upon first draw.
this._resize_canvas(600, 600);

// Disable right mouse context menu.
$(this.rubberband_canvas).bind("contextmenu",function(e){
    return false;
});

function set_focus () {
    canvas.focus();
    canvas_div.focus();
}

window.setTimeout(set_focus, 100);

}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items) {
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) {
        // put a spacer in here.
        continue;
    }
    var button = $('<button/>');
    button.addClass('ui-button ui-widget ui-state-default ui-corner-all ' +
                    'ui-button-icon-only');
    button.attr('role', 'button');
    button.attr('aria-disabled', 'false');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);

    var icon_img = $('<span/>');
    icon_img.addClass('ui-button-icon-primary ui-icon');
    icon_img.addClass(image);
    icon_img.addClass('ui-corner-all');

    var tooltip_span = $('<span/>');
    tooltip_span.addClass('ui-button-text');
    tooltip_span.html(tooltip);

    button.append(icon_img);
    button.append(tooltip_span);

    nav_element.append(button);
}

var fmt_picker_span = $('<span/>');

var fmt_picker = $('<select/>');
fmt_picker.addClass('mpl-toolbar-option ui-widget ui-widget-content');
fmt_picker_span.append(fmt_picker);
nav_element.append(fmt_picker_span);
this.format_dropdown = fmt_picker[0];

for (var ind in mpl.extensions) {
    var fmt = mpl.extensions[ind];
    var option = $(
        '<option/>', {selected: fmt === mpl.default_extension}).html(fmt);
    fmt_picker.append(option)
}

// Add hover states to the ui-buttons
$( ".ui-button" ).hover(
    function() { $(this).addClass("ui-state-hover");},
    function() { $(this).removeClass("ui-state-hover");}
);

var status_bar = $('<span class="mpl-message"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

}

mpl.figure.prototype.request_resize = function(x_pixels, y_pixels) {
// Request matplotlib to resize the figure. Matplotlib will then trigger a resize in the client,
// which will in turn request a refresh of the image.
this.send_message('resize', {'width': x_pixels, 'height': y_pixels});
}

mpl.figure.prototype.send_message = function(type, properties) {
properties['type'] = type;
properties['figure_id'] = this.id;
this.ws.send(JSON.stringify(properties));
}

mpl.figure.prototype.send_draw_message = function() {
if (!this.waiting) {
this.waiting = true;
this.ws.send(JSON.stringify({type: "draw", figure_id: this.id}));
}
}

mpl.figure.prototype.handle_save = function(fig, msg) {
var format_dropdown = fig.format_dropdown;
var format = format_dropdown.options[format_dropdown.selectedIndex].value;
fig.ondownload(fig, format);
}

mpl.figure.prototype.handle_resize = function(fig, msg) {
var size = msg['size'];
if (size[0] != fig.canvas.width || size[1] != fig.canvas.height) {
fig._resize_canvas(size[0], size[1]);
fig.send_message("refresh", {});
};
}

mpl.figure.prototype.handle_rubberband = function(fig, msg) {
var x0 = msg['x0'] / mpl.ratio;
var y0 = (fig.canvas.height - msg['y0']) / mpl.ratio;
var x1 = msg['x1'] / mpl.ratio;
var y1 = (fig.canvas.height - msg['y1']) / mpl.ratio;
x0 = Math.floor(x0) + 0.5;
y0 = Math.floor(y0) + 0.5;
x1 = Math.floor(x1) + 0.5;
y1 = Math.floor(y1) + 0.5;
var min_x = Math.min(x0, x1);
var min_y = Math.min(y0, y1);
var width = Math.abs(x1 - x0);
var height = Math.abs(y1 - y0);

fig.rubberband_context.clearRect(
    0, 0, fig.canvas.width, fig.canvas.height);

fig.rubberband_context.strokeRect(min_x, min_y, width, height);

}

mpl.figure.prototype.handle_figure_label = function(fig, msg) {
// Updates the figure title.
fig.header.textContent = msg['label'];
}

mpl.figure.prototype.handle_cursor = function(fig, msg) {
var cursor = msg['cursor'];
switch(cursor)
{
case 0:
cursor = 'pointer';
break;
case 1:
cursor = 'default';
break;
case 2:
cursor = 'crosshair';
break;
case 3:
cursor = 'move';
break;
}
fig.rubberband_canvas.style.cursor = cursor;
}

mpl.figure.prototype.handle_message = function(fig, msg) {
fig.message.textContent = msg['message'];
}

mpl.figure.prototype.handle_draw = function(fig, msg) {
// Request the server to send over a new figure.
fig.send_draw_message();
}

mpl.figure.prototype.handle_image_mode = function(fig, msg) {
fig.image_mode = msg['mode'];
}

mpl.figure.prototype.updated_canvas_event = function() {
// Called whenever the canvas gets updated.
this.send_message("ack", {});
}

// A function to construct a web socket function for onmessage handling.
// Called in the figure constructor.
mpl.figure.prototype._make_on_message_function = function(fig) {
return function socket_on_message(evt) {
if (evt.data instanceof Blob) {
/* FIXME: We get "Resource interpreted as Image but
* transferred with MIME type text/plain:" errors on
* Chrome. But how to set the MIME type? It doesn't seem
* to be part of the websocket stream */
evt.data.type = "image/png";

        /* Free the memory for the previous frames */
        if (fig.imageObj.src) {
            (window.URL || window.webkitURL).revokeObjectURL(
                fig.imageObj.src);
        }

        fig.imageObj.src = (window.URL || window.webkitURL).createObjectURL(
            evt.data);
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }
    else if (typeof evt.data === 'string' && evt.data.slice(0, 21) == "data:image/png;base64") {
        fig.imageObj.src = evt.data;
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }

    var msg = JSON.parse(evt.data);
    var msg_type = msg['type'];

    // Call the  "handle_{type}" callback, which takes
    // the figure and JSON message as its only arguments.
    try {
        var callback = fig["handle_" + msg_type];
    } catch (e) {
        console.log("No handler for the '" + msg_type + "' message type: ", msg);
        return;
    }

    if (callback) {
        try {
            // console.log("Handling '" + msg_type + "' message: ", msg);
            callback(fig, msg);
        } catch (e) {
            console.log("Exception inside the 'handler_" + msg_type + "' callback:", e, e.stack, msg);
        }
    }
};

}

// from http://stackoverflow.com/questions/1114465/getting-mouse-location-in-canvas
mpl.findpos = function(e) {
//this section is from http://www.quirksmode.org/js/events_properties.html
var targ;
if (!e)
e = window.event;
if (e.target)
targ = e.target;
else if (e.srcElement)
targ = e.srcElement;
if (targ.nodeType == 3) // defeat Safari bug
targ = targ.parentNode;

// jQuery normalizes the pageX and pageY
// pageX,Y are the mouse positions relative to the document
// offset() returns the position of the element relative to the document
var x = e.pageX - $(targ).offset().left;
var y = e.pageY - $(targ).offset().top;

return {"x": x, "y": y};

};

/*

  • return a copy of an object with only non-object keys
  • we need this to avoid circular references
  • http://stackoverflow.com/a/24161582/3208463
    */
    function simpleKeys (original) {
    return Object.keys(original).reduce(function (obj, key) {
    if (typeof original[key] !== 'object')
    obj[key] = original[key]
    return obj;
    }, {});
    }

mpl.figure.prototype.mouse_event = function(event, name) {
var canvas_pos = mpl.findpos(event)

if (name === 'button_press')
{
    this.canvas.focus();
    this.canvas_div.focus();
}

var x = canvas_pos.x * mpl.ratio;
var y = canvas_pos.y * mpl.ratio;

this.send_message(name, {x: x, y: y, button: event.button,
                         step: event.step,
                         guiEvent: simpleKeys(event)});

/* This prevents the web browser from automatically changing to
 * the text insertion cursor when the button is pressed.  We want
 * to control all of the cursor setting manually through the
 * 'cursor' event from matplotlib */
event.preventDefault();
return false;

}

mpl.figure.prototype._key_event_extra = function(event, name) {
// Handle any extra behaviour associated with a key event
}

mpl.figure.prototype.key_event = function(event, name) {

// Prevent repeat events
if (name == 'key_press')
{
    if (event.which === this._key)
        return;
    else
        this._key = event.which;
}
if (name == 'key_release')
    this._key = null;

var value = '';
if (event.ctrlKey && event.which != 17)
    value += "ctrl+";
if (event.altKey && event.which != 18)
    value += "alt+";
if (event.shiftKey && event.which != 16)
    value += "shift+";

value += 'k';
value += event.which.toString();

this._key_event_extra(event, name);

this.send_message(name, {key: value,
                         guiEvent: simpleKeys(event)});
return false;

}

mpl.figure.prototype.toolbar_button_onclick = function(name) {
if (name == 'download') {
this.handle_save(this, null);
} else {
this.send_message("toolbar_button", {name: name});
}
};

mpl.figure.prototype.toolbar_button_onmouseover = function(tooltip) {
this.message.textContent = tooltip;
};
mpl.toolbar_items = [["Home", "Reset original view", "fa fa-home icon-home", "home"], ["Back", "Back to previous view", "fa fa-arrow-left icon-arrow-left", "back"], ["Forward", "Forward to next view", "fa fa-arrow-right icon-arrow-right", "forward"], ["", "", "", ""], ["Pan", "Pan axes with left mouse, zoom with right", "fa fa-arrows icon-move", "pan"], ["Zoom", "Zoom to rectangle", "fa fa-square-o icon-check-empty", "zoom"], ["", "", "", ""], ["Download", "Download plot", "fa fa-floppy-o icon-save", "download"]];

mpl.extensions = ["eps", "pdf", "png", "ps", "raw", "svg"];

mpl.default_extension = "png";var comm_websocket_adapter = function(comm) {
// Create a "websocket"-like object which calls the given IPython comm
// object with the appropriate methods. Currently this is a non binary
// socket, so there is still some room for performance tuning.
var ws = {};

ws.close = function() {
    comm.close()
};
ws.send = function(m) {
    //console.log('sending', m);
    comm.send(m);
};
// Register the callback with on_msg.
comm.on_msg(function(msg) {
    //console.log('receiving', msg['content']['data'], msg);
    // Pass the mpl event to the overriden (by mpl) onmessage function.
    ws.onmessage(msg['content']['data'])
});
return ws;

}

mpl.mpl_figure_comm = function(comm, msg) {
// This is the function which gets called when the mpl process
// starts-up an IPython Comm through the "matplotlib" channel.

var id = msg.content.data.id;
// Get hold of the div created by the display call when the Comm
// socket was opened in Python.
var element = $("#" + id);
var ws_proxy = comm_websocket_adapter(comm)

function ondownload(figure, format) {
    window.open(figure.imageObj.src);
}

var fig = new mpl.figure(id, ws_proxy,
                       ondownload,
                       element.get(0));

// Call onopen now - mpl needs it, as it is assuming we've passed it a real
// web socket which is closed, not our websocket->open comm proxy.
ws_proxy.onopen();

fig.parent_element = element.get(0);
fig.cell_info = mpl.find_output_cell("<div id='" + id + "'></div>");
if (!fig.cell_info) {
    console.error("Failed to find cell for figure", id, fig);
    return;
}

var output_index = fig.cell_info[2]
var cell = fig.cell_info[0];

};

mpl.figure.prototype.handle_close = function(fig, msg) {
var width = fig.canvas.width/mpl.ratio
fig.root.unbind('remove')

// Update the output cell to use the data from the current canvas.
fig.push_to_output();
var dataURL = fig.canvas.toDataURL();
// Re-enable the keyboard manager in IPython - without this line, in FF,
// the notebook keyboard shortcuts fail.
IPython.keyboard_manager.enable()
$(fig.parent_element).html('<img src="' + dataURL + '" width="' + width + '">');
fig.close_ws(fig, msg);

}

mpl.figure.prototype.close_ws = function(fig, msg){
fig.send_message('closing', msg);
// fig.ws.close()
}

mpl.figure.prototype.push_to_output = function(remove_interactive) {
// Turn the data on the canvas into data in the output cell.
var width = this.canvas.width/mpl.ratio
var dataURL = this.canvas.toDataURL();
this.cell_info[1]['text/html'] = '';
}

mpl.figure.prototype.updated_canvas_event = function() {
// Tell IPython that the notebook contents must change.
IPython.notebook.set_dirty(true);
this.send_message("ack", {});
var fig = this;
// Wait a second, then push the new image to the DOM so
// that it is saved nicely (might be nice to debounce this).
setTimeout(function () { fig.push_to_output() }, 1000);
}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items){
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) { continue; };

    var button = $('<button class="btn btn-default" href="#" title="' + name + '"><i class="fa ' + image + ' fa-lg"></i></button>');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);
    nav_element.append(button);
}

// Add the status bar.
var status_bar = $('<span class="mpl-message" style="text-align:right; float: right;"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

// Add the close button to the window.
var buttongrp = $('<div class="btn-group inline pull-right"></div>');
var button = $('<button class="btn btn-mini btn-primary" href="#" title="Stop Interaction"><i class="fa fa-power-off icon-remove icon-large"></i></button>');
button.click(function (evt) { fig.handle_close(fig, {}); } );
button.mouseover('Stop Interaction', toolbar_mouse_event);
buttongrp.append(button);
var titlebar = this.root.find($('.ui-dialog-titlebar'));
titlebar.prepend(buttongrp);

}

mpl.figure.prototype._root_extra_style = function(el){
var fig = this
el.on("remove", function(){
fig.close_ws(fig, {});
});
}

mpl.figure.prototype._canvas_extra_style = function(el){
// this is important to make the div 'focusable
el.attr('tabindex', 0)
// reach out to IPython and tell the keyboard manager to turn it's self
// off when our div gets focus

// location in version 3
if (IPython.notebook.keyboard_manager) {
    IPython.notebook.keyboard_manager.register_events(el);
}
else {
    // location in version 2
    IPython.keyboard_manager.register_events(el);
}

}

mpl.figure.prototype._key_event_extra = function(event, name) {
var manager = IPython.notebook.keyboard_manager;
if (!manager)
manager = IPython.keyboard_manager;

// Check for shift+enter
if (event.shiftKey && event.which == 13) {
    this.canvas_div.blur();
    event.shiftKey = false;
    // Send a "J" for go to next cell
    event.which = 74;
    event.keyCode = 74;
    manager.command_mode();
    manager.handle_keydown(event);
}

}

mpl.figure.prototype.handle_save = function(fig, msg) {
fig.ondownload(fig, null);
}

mpl.find_output_cell = function(html_output) {
// Return the cell and output element which can be found uniquely in the notebook.
// Note - this is a bit hacky, but it is done because the "notebook_saving.Notebook"
// IPython event is triggered only after the cells have been serialised, which for
// our purposes (turning an active figure into a static one), is too late.
var cells = IPython.notebook.get_cells();
var ncells = cells.length;
for (var i=0; i<ncells; i++) {
var cell = cells[i];
if (cell.cell_type === 'code'){
for (var j=0; j<cell.output_area.outputs.length; j++) {
var data = cell.output_area.outputs[j];
if (data.data) {
// IPython >= 3 moved mimebundle to data attribute of output
data = data.data;
}
if (data['text/html'] == html_output) {
return [cell, data, j];
}
}
}
}
}

// Register the function which deals with the matplotlib target/channel.
// The kernel may be null if the page has been refreshed.
if (IPython.notebook.kernel != null) {
IPython.notebook.kernel.comm_manager.register_target('matplotlib', mpl.mpl_figure_comm);
}

/* Put everything inside the global mpl namespace */
window.mpl = {};

mpl.get_websocket_type = function() {
if (typeof(WebSocket) !== 'undefined') {
return WebSocket;
} else if (typeof(MozWebSocket) !== 'undefined') {
return MozWebSocket;
} else {
alert('Your browser does not have WebSocket support.' +
'Please try Chrome, Safari or Firefox ≥ 6. ' +
'Firefox 4 and 5 are also supported but you ' +
'have to enable WebSockets in about:config.');
};
}

mpl.figure = function(figure_id, websocket, ondownload, parent_element) {
this.id = figure_id;

this.ws = websocket;

this.supports_binary = (this.ws.binaryType != undefined);

if (!this.supports_binary) {
    var warnings = document.getElementById("mpl-warnings");
    if (warnings) {
        warnings.style.display = 'block';
        warnings.textContent = (
            "This browser does not support binary websocket messages. " +
                "Performance may be slow.");
    }
}

this.imageObj = new Image();

this.context = undefined;
this.message = undefined;
this.canvas = undefined;
this.rubberband_canvas = undefined;
this.rubberband_context = undefined;
this.format_dropdown = undefined;

this.image_mode = 'full';

this.root = $('<div/>');
this._root_extra_style(this.root)
this.root.attr('style', 'display: inline-block');

$(parent_element).append(this.root);

this._init_header(this);
this._init_canvas(this);
this._init_toolbar(this);

var fig = this;

this.waiting = false;

this.ws.onopen =  function () {
        fig.send_message("supports_binary", {value: fig.supports_binary});
        fig.send_message("send_image_mode", {});
        if (mpl.ratio != 1) {
            fig.send_message("set_dpi_ratio", {'dpi_ratio': mpl.ratio});
        }
        fig.send_message("refresh", {});
    }

this.imageObj.onload = function() {
        if (fig.image_mode == 'full') {
            // Full images could contain transparency (where diff images
            // almost always do), so we need to clear the canvas so that
            // there is no ghosting.
            fig.context.clearRect(0, 0, fig.canvas.width, fig.canvas.height);
        }
        fig.context.drawImage(fig.imageObj, 0, 0);
    };

this.imageObj.onunload = function() {
    fig.ws.close();
}

this.ws.onmessage = this._make_on_message_function(this);

this.ondownload = ondownload;

}

mpl.figure.prototype._init_header = function() {
var titlebar = $(
'

');
var titletext = $(
'
');
titlebar.append(titletext)
this.root.append(titlebar);
this.header = titletext[0];
}

mpl.figure.prototype._canvas_extra_style = function(canvas_div) {

}

mpl.figure.prototype._root_extra_style = function(canvas_div) {

}

mpl.figure.prototype._init_canvas = function() {
var fig = this;

var canvas_div = $('<div/>');

canvas_div.attr('style', 'position: relative; clear: both; outline: 0');

function canvas_keyboard_event(event) {
    return fig.key_event(event, event['data']);
}

canvas_div.keydown('key_press', canvas_keyboard_event);
canvas_div.keyup('key_release', canvas_keyboard_event);
this.canvas_div = canvas_div
this._canvas_extra_style(canvas_div)
this.root.append(canvas_div);

var canvas = $('<canvas/>');
canvas.addClass('mpl-canvas');
canvas.attr('style', "left: 0; top: 0; z-index: 0; outline: 0")

this.canvas = canvas[0];
this.context = canvas[0].getContext("2d");

var backingStore = this.context.backingStorePixelRatio ||

this.context.webkitBackingStorePixelRatio ||
this.context.mozBackingStorePixelRatio ||
this.context.msBackingStorePixelRatio ||
this.context.oBackingStorePixelRatio ||
this.context.backingStorePixelRatio || 1;

mpl.ratio = (window.devicePixelRatio || 1) / backingStore;

var rubberband = $('<canvas/>');
rubberband.attr('style', "position: absolute; left: 0; top: 0; z-index: 1;")

var pass_mouse_events = true;

canvas_div.resizable({
    start: function(event, ui) {
        pass_mouse_events = false;
    },
    resize: function(event, ui) {
        fig.request_resize(ui.size.width, ui.size.height);
    },
    stop: function(event, ui) {
        pass_mouse_events = true;
        fig.request_resize(ui.size.width, ui.size.height);
    },
});

function mouse_event_fn(event) {
    if (pass_mouse_events)
        return fig.mouse_event(event, event['data']);
}

rubberband.mousedown('button_press', mouse_event_fn);
rubberband.mouseup('button_release', mouse_event_fn);
// Throttle sequential mouse events to 1 every 20ms.
rubberband.mousemove('motion_notify', mouse_event_fn);

rubberband.mouseenter('figure_enter', mouse_event_fn);
rubberband.mouseleave('figure_leave', mouse_event_fn);

canvas_div.on("wheel", function (event) {
    event = event.originalEvent;
    event['data'] = 'scroll'
    if (event.deltaY < 0) {
        event.step = 1;
    } else {
        event.step = -1;
    }
    mouse_event_fn(event);
});

canvas_div.append(canvas);
canvas_div.append(rubberband);

this.rubberband = rubberband;
this.rubberband_canvas = rubberband[0];
this.rubberband_context = rubberband[0].getContext("2d");
this.rubberband_context.strokeStyle = "#000000";

this._resize_canvas = function(width, height) {
    // Keep the size of the canvas, canvas container, and rubber band
    // canvas in synch.
    canvas_div.css('width', width)
    canvas_div.css('height', height)

    canvas.attr('width', width * mpl.ratio);
    canvas.attr('height', height * mpl.ratio);
    canvas.attr('style', 'width: ' + width + 'px; height: ' + height + 'px;');

    rubberband.attr('width', width);
    rubberband.attr('height', height);
}

// Set the figure to an initial 600x600px, this will subsequently be updated
// upon first draw.
this._resize_canvas(600, 600);

// Disable right mouse context menu.
$(this.rubberband_canvas).bind("contextmenu",function(e){
    return false;
});

function set_focus () {
    canvas.focus();
    canvas_div.focus();
}

window.setTimeout(set_focus, 100);

}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items) {
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) {
        // put a spacer in here.
        continue;
    }
    var button = $('<button/>');
    button.addClass('ui-button ui-widget ui-state-default ui-corner-all ' +
                    'ui-button-icon-only');
    button.attr('role', 'button');
    button.attr('aria-disabled', 'false');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);

    var icon_img = $('<span/>');
    icon_img.addClass('ui-button-icon-primary ui-icon');
    icon_img.addClass(image);
    icon_img.addClass('ui-corner-all');

    var tooltip_span = $('<span/>');
    tooltip_span.addClass('ui-button-text');
    tooltip_span.html(tooltip);

    button.append(icon_img);
    button.append(tooltip_span);

    nav_element.append(button);
}

var fmt_picker_span = $('<span/>');

var fmt_picker = $('<select/>');
fmt_picker.addClass('mpl-toolbar-option ui-widget ui-widget-content');
fmt_picker_span.append(fmt_picker);
nav_element.append(fmt_picker_span);
this.format_dropdown = fmt_picker[0];

for (var ind in mpl.extensions) {
    var fmt = mpl.extensions[ind];
    var option = $(
        '<option/>', {selected: fmt === mpl.default_extension}).html(fmt);
    fmt_picker.append(option)
}

// Add hover states to the ui-buttons
$( ".ui-button" ).hover(
    function() { $(this).addClass("ui-state-hover");},
    function() { $(this).removeClass("ui-state-hover");}
);

var status_bar = $('<span class="mpl-message"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

}

mpl.figure.prototype.request_resize = function(x_pixels, y_pixels) {
// Request matplotlib to resize the figure. Matplotlib will then trigger a resize in the client,
// which will in turn request a refresh of the image.
this.send_message('resize', {'width': x_pixels, 'height': y_pixels});
}

mpl.figure.prototype.send_message = function(type, properties) {
properties['type'] = type;
properties['figure_id'] = this.id;
this.ws.send(JSON.stringify(properties));
}

mpl.figure.prototype.send_draw_message = function() {
if (!this.waiting) {
this.waiting = true;
this.ws.send(JSON.stringify({type: "draw", figure_id: this.id}));
}
}

mpl.figure.prototype.handle_save = function(fig, msg) {
var format_dropdown = fig.format_dropdown;
var format = format_dropdown.options[format_dropdown.selectedIndex].value;
fig.ondownload(fig, format);
}

mpl.figure.prototype.handle_resize = function(fig, msg) {
var size = msg['size'];
if (size[0] != fig.canvas.width || size[1] != fig.canvas.height) {
fig._resize_canvas(size[0], size[1]);
fig.send_message("refresh", {});
};
}

mpl.figure.prototype.handle_rubberband = function(fig, msg) {
var x0 = msg['x0'] / mpl.ratio;
var y0 = (fig.canvas.height - msg['y0']) / mpl.ratio;
var x1 = msg['x1'] / mpl.ratio;
var y1 = (fig.canvas.height - msg['y1']) / mpl.ratio;
x0 = Math.floor(x0) + 0.5;
y0 = Math.floor(y0) + 0.5;
x1 = Math.floor(x1) + 0.5;
y1 = Math.floor(y1) + 0.5;
var min_x = Math.min(x0, x1);
var min_y = Math.min(y0, y1);
var width = Math.abs(x1 - x0);
var height = Math.abs(y1 - y0);

fig.rubberband_context.clearRect(
    0, 0, fig.canvas.width, fig.canvas.height);

fig.rubberband_context.strokeRect(min_x, min_y, width, height);

}

mpl.figure.prototype.handle_figure_label = function(fig, msg) {
// Updates the figure title.
fig.header.textContent = msg['label'];
}

mpl.figure.prototype.handle_cursor = function(fig, msg) {
var cursor = msg['cursor'];
switch(cursor)
{
case 0:
cursor = 'pointer';
break;
case 1:
cursor = 'default';
break;
case 2:
cursor = 'crosshair';
break;
case 3:
cursor = 'move';
break;
}
fig.rubberband_canvas.style.cursor = cursor;
}

mpl.figure.prototype.handle_message = function(fig, msg) {
fig.message.textContent = msg['message'];
}

mpl.figure.prototype.handle_draw = function(fig, msg) {
// Request the server to send over a new figure.
fig.send_draw_message();
}

mpl.figure.prototype.handle_image_mode = function(fig, msg) {
fig.image_mode = msg['mode'];
}

mpl.figure.prototype.updated_canvas_event = function() {
// Called whenever the canvas gets updated.
this.send_message("ack", {});
}

// A function to construct a web socket function for onmessage handling.
// Called in the figure constructor.
mpl.figure.prototype._make_on_message_function = function(fig) {
return function socket_on_message(evt) {
if (evt.data instanceof Blob) {
/* FIXME: We get "Resource interpreted as Image but
* transferred with MIME type text/plain:" errors on
* Chrome. But how to set the MIME type? It doesn't seem
* to be part of the websocket stream */
evt.data.type = "image/png";

        /* Free the memory for the previous frames */
        if (fig.imageObj.src) {
            (window.URL || window.webkitURL).revokeObjectURL(
                fig.imageObj.src);
        }

        fig.imageObj.src = (window.URL || window.webkitURL).createObjectURL(
            evt.data);
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }
    else if (typeof evt.data === 'string' && evt.data.slice(0, 21) == "data:image/png;base64") {
        fig.imageObj.src = evt.data;
        fig.updated_canvas_event();
        fig.waiting = false;
        return;
    }

    var msg = JSON.parse(evt.data);
    var msg_type = msg['type'];

    // Call the  "handle_{type}" callback, which takes
    // the figure and JSON message as its only arguments.
    try {
        var callback = fig["handle_" + msg_type];
    } catch (e) {
        console.log("No handler for the '" + msg_type + "' message type: ", msg);
        return;
    }

    if (callback) {
        try {
            // console.log("Handling '" + msg_type + "' message: ", msg);
            callback(fig, msg);
        } catch (e) {
            console.log("Exception inside the 'handler_" + msg_type + "' callback:", e, e.stack, msg);
        }
    }
};

}

// from http://stackoverflow.com/questions/1114465/getting-mouse-location-in-canvas
mpl.findpos = function(e) {
//this section is from http://www.quirksmode.org/js/events_properties.html
var targ;
if (!e)
e = window.event;
if (e.target)
targ = e.target;
else if (e.srcElement)
targ = e.srcElement;
if (targ.nodeType == 3) // defeat Safari bug
targ = targ.parentNode;

// jQuery normalizes the pageX and pageY
// pageX,Y are the mouse positions relative to the document
// offset() returns the position of the element relative to the document
var x = e.pageX - $(targ).offset().left;
var y = e.pageY - $(targ).offset().top;

return {"x": x, "y": y};

};

/*

  • return a copy of an object with only non-object keys
  • we need this to avoid circular references
  • http://stackoverflow.com/a/24161582/3208463
    */
    function simpleKeys (original) {
    return Object.keys(original).reduce(function (obj, key) {
    if (typeof original[key] !== 'object')
    obj[key] = original[key]
    return obj;
    }, {});
    }

mpl.figure.prototype.mouse_event = function(event, name) {
var canvas_pos = mpl.findpos(event)

if (name === 'button_press')
{
    this.canvas.focus();
    this.canvas_div.focus();
}

var x = canvas_pos.x * mpl.ratio;
var y = canvas_pos.y * mpl.ratio;

this.send_message(name, {x: x, y: y, button: event.button,
                         step: event.step,
                         guiEvent: simpleKeys(event)});

/* This prevents the web browser from automatically changing to
 * the text insertion cursor when the button is pressed.  We want
 * to control all of the cursor setting manually through the
 * 'cursor' event from matplotlib */
event.preventDefault();
return false;

}

mpl.figure.prototype._key_event_extra = function(event, name) {
// Handle any extra behaviour associated with a key event
}

mpl.figure.prototype.key_event = function(event, name) {

// Prevent repeat events
if (name == 'key_press')
{
    if (event.which === this._key)
        return;
    else
        this._key = event.which;
}
if (name == 'key_release')
    this._key = null;

var value = '';
if (event.ctrlKey && event.which != 17)
    value += "ctrl+";
if (event.altKey && event.which != 18)
    value += "alt+";
if (event.shiftKey && event.which != 16)
    value += "shift+";

value += 'k';
value += event.which.toString();

this._key_event_extra(event, name);

this.send_message(name, {key: value,
                         guiEvent: simpleKeys(event)});
return false;

}

mpl.figure.prototype.toolbar_button_onclick = function(name) {
if (name == 'download') {
this.handle_save(this, null);
} else {
this.send_message("toolbar_button", {name: name});
}
};

mpl.figure.prototype.toolbar_button_onmouseover = function(tooltip) {
this.message.textContent = tooltip;
};
mpl.toolbar_items = [["Home", "Reset original view", "fa fa-home icon-home", "home"], ["Back", "Back to previous view", "fa fa-arrow-left icon-arrow-left", "back"], ["Forward", "Forward to next view", "fa fa-arrow-right icon-arrow-right", "forward"], ["", "", "", ""], ["Pan", "Pan axes with left mouse, zoom with right", "fa fa-arrows icon-move", "pan"], ["Zoom", "Zoom to rectangle", "fa fa-square-o icon-check-empty", "zoom"], ["", "", "", ""], ["Download", "Download plot", "fa fa-floppy-o icon-save", "download"]];

mpl.extensions = ["eps", "pdf", "png", "ps", "raw", "svg"];

mpl.default_extension = "png";var comm_websocket_adapter = function(comm) {
// Create a "websocket"-like object which calls the given IPython comm
// object with the appropriate methods. Currently this is a non binary
// socket, so there is still some room for performance tuning.
var ws = {};

ws.close = function() {
    comm.close()
};
ws.send = function(m) {
    //console.log('sending', m);
    comm.send(m);
};
// Register the callback with on_msg.
comm.on_msg(function(msg) {
    //console.log('receiving', msg['content']['data'], msg);
    // Pass the mpl event to the overriden (by mpl) onmessage function.
    ws.onmessage(msg['content']['data'])
});
return ws;

}

mpl.mpl_figure_comm = function(comm, msg) {
// This is the function which gets called when the mpl process
// starts-up an IPython Comm through the "matplotlib" channel.

var id = msg.content.data.id;
// Get hold of the div created by the display call when the Comm
// socket was opened in Python.
var element = $("#" + id);
var ws_proxy = comm_websocket_adapter(comm)

function ondownload(figure, format) {
    window.open(figure.imageObj.src);
}

var fig = new mpl.figure(id, ws_proxy,
                       ondownload,
                       element.get(0));

// Call onopen now - mpl needs it, as it is assuming we've passed it a real
// web socket which is closed, not our websocket->open comm proxy.
ws_proxy.onopen();

fig.parent_element = element.get(0);
fig.cell_info = mpl.find_output_cell("<div id='" + id + "'></div>");
if (!fig.cell_info) {
    console.error("Failed to find cell for figure", id, fig);
    return;
}

var output_index = fig.cell_info[2]
var cell = fig.cell_info[0];

};

mpl.figure.prototype.handle_close = function(fig, msg) {
var width = fig.canvas.width/mpl.ratio
fig.root.unbind('remove')

// Update the output cell to use the data from the current canvas.
fig.push_to_output();
var dataURL = fig.canvas.toDataURL();
// Re-enable the keyboard manager in IPython - without this line, in FF,
// the notebook keyboard shortcuts fail.
IPython.keyboard_manager.enable()
$(fig.parent_element).html('<img src="' + dataURL + '" width="' + width + '">');
fig.close_ws(fig, msg);

}

mpl.figure.prototype.close_ws = function(fig, msg){
fig.send_message('closing', msg);
// fig.ws.close()
}

mpl.figure.prototype.push_to_output = function(remove_interactive) {
// Turn the data on the canvas into data in the output cell.
var width = this.canvas.width/mpl.ratio
var dataURL = this.canvas.toDataURL();
this.cell_info[1]['text/html'] = '';
}

mpl.figure.prototype.updated_canvas_event = function() {
// Tell IPython that the notebook contents must change.
IPython.notebook.set_dirty(true);
this.send_message("ack", {});
var fig = this;
// Wait a second, then push the new image to the DOM so
// that it is saved nicely (might be nice to debounce this).
setTimeout(function () { fig.push_to_output() }, 1000);
}

mpl.figure.prototype._init_toolbar = function() {
var fig = this;

var nav_element = $('<div/>')
nav_element.attr('style', 'width: 100%');
this.root.append(nav_element);

// Define a callback function for later on.
function toolbar_event(event) {
    return fig.toolbar_button_onclick(event['data']);
}
function toolbar_mouse_event(event) {
    return fig.toolbar_button_onmouseover(event['data']);
}

for(var toolbar_ind in mpl.toolbar_items){
    var name = mpl.toolbar_items[toolbar_ind][0];
    var tooltip = mpl.toolbar_items[toolbar_ind][1];
    var image = mpl.toolbar_items[toolbar_ind][2];
    var method_name = mpl.toolbar_items[toolbar_ind][3];

    if (!name) { continue; };

    var button = $('<button class="btn btn-default" href="#" title="' + name + '"><i class="fa ' + image + ' fa-lg"></i></button>');
    button.click(method_name, toolbar_event);
    button.mouseover(tooltip, toolbar_mouse_event);
    nav_element.append(button);
}

// Add the status bar.
var status_bar = $('<span class="mpl-message" style="text-align:right; float: right;"/>');
nav_element.append(status_bar);
this.message = status_bar[0];

// Add the close button to the window.
var buttongrp = $('<div class="btn-group inline pull-right"></div>');
var button = $('<button class="btn btn-mini btn-primary" href="#" title="Stop Interaction"><i class="fa fa-power-off icon-remove icon-large"></i></button>');
button.click(function (evt) { fig.handle_close(fig, {}); } );
button.mouseover('Stop Interaction', toolbar_mouse_event);
buttongrp.append(button);
var titlebar = this.root.find($('.ui-dialog-titlebar'));
titlebar.prepend(buttongrp);

}

mpl.figure.prototype._root_extra_style = function(el){
var fig = this
el.on("remove", function(){
fig.close_ws(fig, {});
});
}

mpl.figure.prototype._canvas_extra_style = function(el){
// this is important to make the div 'focusable
el.attr('tabindex', 0)
// reach out to IPython and tell the keyboard manager to turn it's self
// off when our div gets focus

// location in version 3
if (IPython.notebook.keyboard_manager) {
    IPython.notebook.keyboard_manager.register_events(el);
}
else {
    // location in version 2
    IPython.keyboard_manager.register_events(el);
}

}

mpl.figure.prototype._key_event_extra = function(event, name) {
var manager = IPython.notebook.keyboard_manager;
if (!manager)
manager = IPython.keyboard_manager;

// Check for shift+enter
if (event.shiftKey && event.which == 13) {
    this.canvas_div.blur();
    event.shiftKey = false;
    // Send a "J" for go to next cell
    event.which = 74;
    event.keyCode = 74;
    manager.command_mode();
    manager.handle_keydown(event);
}

}

mpl.figure.prototype.handle_save = function(fig, msg) {
fig.ondownload(fig, null);
}

mpl.find_output_cell = function(html_output) {
// Return the cell and output element which can be found uniquely in the notebook.
// Note - this is a bit hacky, but it is done because the "notebook_saving.Notebook"
// IPython event is triggered only after the cells have been serialised, which for
// our purposes (turning an active figure into a static one), is too late.
var cells = IPython.notebook.get_cells();
var ncells = cells.length;
for (var i=0; i<ncells; i++) {
var cell = cells[i];
if (cell.cell_type === 'code'){
for (var j=0; j<cell.output_area.outputs.length; j++) {
var data = cell.output_area.outputs[j];
if (data.data) {
// IPython >= 3 moved mimebundle to data attribute of output
data = data.data;
}
if (data['text/html'] == html_output) {
return [cell, data, j];
}
}
}
}
}

// Register the function which deals with the matplotlib target/channel.
// The kernel may be null if the page has been refreshed.
if (IPython.notebook.kernel != null) {
IPython.notebook.kernel.comm_manager.register_target('matplotlib', mpl.mpl_figure_comm);
}

Does anyone can help me please?

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