Reproducible clouds

package.json

@@ -27,6 +27,7 @@
     "canvas": "^1.2.1"
   },
   "devDependencies": {
-    "jsdom": "^3.0.0"
+    "jsdom": "^3.0.0",
+    "mersenne-twister": "^1.0.1"
   }
-}
+}

src/d3.layout.cloud.js

@@ -7,7 +7,9 @@ else cloud(this.d3);
 function cloud(d3) {
   var random = Math.random;
   d3.layout.cloud = function cloud() {
-    var size = [256, 256],
+    var DEFAULT_WIDTH = 256,
+      DEFAULT_HEIGHT = 256,
+      size = [DEFAULT_WIDTH, DEFAULT_HEIGHT],
       startPoint = null,
       text = cloudText,
       font = cloudFont,
@@ -179,6 +181,9 @@ function cloud(d3) {
     };
 
     cloud.size = function(_) {
+      if (!arguments.length) return size;
+      if (!_[0] || _[0] < 0) _[0] = DEFAULT_WIDTH;
+      if (!_[1] || _[1] < 1) _[1] = DEFAULT_HEIGHT;
       return arguments.length ? (size = [+_[0], +_[1]], cloud) : size;
     };
 

test/SpecRunner.html

@@ -12,13 +12,16 @@
   <script type="text/javascript" src="bower_components/jasmine/lib/jasmine-core/jasmine-html.js"></script>
   <script type="text/javascript" src="bower_components/jasmine/lib/jasmine-core/boot.js"></script>
 
+  <script type="text/javascript" src="../node_modules/mersenne-twister/src/mersenne-twister.js"></script>
+
   <script type="text/javascript" src="bower_components/d3/d3.js"></script>
   <script type="text/javascript" src="../src/d3.layout.cloud.js"></script>
 
   <!-- include spec files here... -->
   <script type="text/javascript" src="d3.layout.cloud-spec.js"></script>
   <script type="text/javascript" src="amd-spec.js"></script>
   <script type="text/javascript" src="simple-cloud-spec.js"></script>
+  <script type="text/javascript" src="replicable-layout-spec.js"></script>
 
 </body>
 </html>

test/d3.layout.cloud-spec.js

@@ -140,6 +140,28 @@
 
       });
 
+      describe('size()', function() {
+
+        var mySizeCloud = cloud()
+          .size([300, 400]);
+
+        it('should have a size() function which sets and/or returns the size of the svg of the cloud', function() {
+          expect(mySizeCloud.size()).toEqual([300, 400]);
+        });
+
+        it('should survive an invalid a size()', function() {
+          expect(mySizeCloud.size([null, null]).size()).toEqual([256, 256]);
+        });
+
+        it('should survive a string size()', function() {
+          expect(mySizeCloud.size(['22', '505.4']).size()).toEqual([22, 505.4]);
+        });
+
+        it('should survive a negative size()', function() {
+          expect(mySizeCloud.size([-20, -30.5]).size()).toEqual([256, 256]);
+        });
+      });
+
       describe('start()', function() {
 
         var myStartedCloud = cloud()