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Add shameless self-promotion for my book.
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‎Cargo.lock

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‎book/src/chapter23-prefix.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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This started out as part of section 2, but I realized it was a *large*, open topic. The larger roguelike games, such as Dungeon Crawl Stone Soup, Cogmind, Caves of Qud, etc. all have a variety of maps. Section 3 is all about map building, and will cover many of the available algorithms for procedurally building interesting maps.

‎book/src/chapter_0.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Every year, the fine fellows over at [r/roguelikedev](https://www.reddit.com/r/roguelikedev/new/) run a *Tutorial Tuesday* series - encouraging new programmers to join the ranks of roguelike developers. Most languages end up being represented, and this year (2019) I decided that I'd use it as an excuse to learn Rust. I didn't really want to use `libtcod`, the default engine - so I created my own, [RLTK](https://github.com/thebracket/bracket-lib). My initial entry into the series isn't very good, but I learned a lot from it - you can find it [here](https://github.com/thebracket/rustyroguelike), if you are curious.

‎book/src/chapter_1.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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This tutorial is primarily about learning to make roguelikes (and by extension other games), but it should also help you get used to Rust and RLTK - The *Roguelike Tool Kit* we'll be using to provide input/output. Even if you don't want to use Rust, my hope is that you can benefit from the structure, ideas and general game development advice.

‎book/src/chapter_10.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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In the last chapter, we added items and inventory - and a single item type, a health potion. Now we'll add a second item type: *a scroll of magic missile*, that lets you zap an entity at range.

‎book/src/chapter_11.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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In the last few chapters, we've focused on getting a playable (if not massively fun) game going. You can run around, slay monsters, and make use of various items. That's a great start! Most games let you stop playing, and come back later to continue. Fortunately, Rust (and associated libraries) makes it relatively easy.

‎book/src/chapter_12.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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We have all the basics of a dungeon crawler now, but only having a single level is a big limitation! This chapter will introduce depth, with a new dungeon being spawned on each level down. We'll track the player's depth, and encourage ever-deeper exploration. What could possibly go wrong for the player?

‎book/src/chapter_13.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Currently, you can advance through multiple dungeon levels - but they all have the same spawns. There's no ramp-up of difficulty as you advance, and no easy-mode to get you through the beginning. This chapter aims to change that.

‎book/src/chapter_14.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Now that we have a dungeon with increasing difficulty, it's time to start giving the player some ways to improve their performance! In this chapter, we'll start with the most basic of human tasks: equipping a weapon and shield.

‎book/src/chapter_15.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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I've been enjoying writing this tutorial, and people are using it (thank you!) - so I decided to keep adding content. Section 2 is more of a smorgasbord of content than a structured tutorial. I'll keep adding content as we try to build a great roguelike as a community.

‎book/src/chapter_16.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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So far, we've used a very traditional rendering style for the map. Hash symbols for walls, periods for floors. It looks pretty nice, but games like *Dwarf Fortress* do a lovely job of using codepage 437's line-drawing characters to make the walls of the dungeon look smooth. This short chapter will show how to use a `bitmask` to calculate appropriate walls and render them appropriately. As usual, we'll start with our previous code from the end of Section 1.

‎book/src/chapter_17.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Our character lives the life of a "murder-hobo", looting and slaying at will - so it only makes sense that the pristine dungeon will start to resemble a charnel house. It also gives us a bridge into a future chapter, in which we'll start to add some particle and visual effects (in ASCII/CP437) to the game.

‎book/src/chapter_18.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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There's no real visual feedback for your actions - you hit something, and it either goes away, or it doesn't. Bloodstains give a good impression of what *previously* happened in a location - but it would be nice to give some sort of instant reaction to your actions. These need to be fast, non-blocking (so you don't have to wait for the animation to finish to keep playing), and not too intrusive. Particles are a good fit for this, so we'll implement a simple ASCII/CP437 particle system.

‎book/src/chapter_19.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Hunger clocks are a controversial feature of a lot of roguelikes. They can really irritate the player if you are spending all of your time looking for food, but they also drive you forward - so you can't sit around without exploring more. Resting to heal becomes more of a risk/reward system, in particular. This chapter will implement a basic hunger clock for the player.

‎book/src/chapter_2.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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This chapter will introduce the entire of an Entity Component System (ECS), which will form the backbone of the rest of this tutorial. Rust has a very good ECS, called Specs - and this tutorial will show you how to use it, and try to demonstrate some of the early benefits of using it.

‎book/src/chapter_20.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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A really common item in roguelikes is the *scroll of magic mapping*. You read it, and the dungeon is revealed. Fancier roguelikes have nice graphics for it. In this chapter, we'll start by making it work - and then make it pretty!

‎book/src/chapter_21.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Our main menu is really boring, and not a good way to attract players! This chapter will spice it up a bit.

‎book/src/chapter_22.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Most roguelikes, like their D&D precursors, feature traps in the dungeon. Walk down an innocent looking hallway, and *oops* - an arrow flies out and hits you. This chapter will implement some simple traps, and then examine some of the game implications they bring.

‎book/src/chapter_23.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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So far, we've really just had one map design. It's different every time (unless you hit a repeat random seed), which is a great start - but the world of procedural generation leaves so many more possibilities. Over the next few chapters, we'll start building a few different map types.

‎book/src/chapter_24.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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As we're diving into generating new and interesting maps, it would be helpful to provide a way to *see* what the algorithms are doing. This chapter will build a test harness to accomplish this, and extend the `SimpleMapBuilder` from the previous chapter to support it. This is going to be a relatively large task, and we'll learn some new techniques along the way!

‎book/src/chapter_25.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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A popular method of map generation uses "binary space partition" to sub-divide your map into rectangles of varying size, and then link the resulting rooms together into corridors. You can go a *long* way with this method: Nethack uses it extensively, Dungeon Crawl: Stone Soup uses it sometimes, and my project - One Knight in the Dungeon - uses it for sewer levels. This chapter will use the visualizer from the previous chapter to walk you through using this technique.

‎book/src/chapter_26.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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In the last chapter, we used binary space partition (BSP) to build a dungeon with rooms. BSP is flexible, and can help you with a lot of problems; in this example, we're going to modify BSP to design an interior dungeon - completely inside a rectangular structure (for example, a castle) and with no wasted space other than interior walls.

‎book/src/chapter_27.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Sometimes, you need a break from rectangular rooms. You might want a nice, organic looking cavern; a winding forest trail, or a spooky quarry. *One Knight in the Dungeon* uses cellular automata for this purpose, inspired by [this excellent article](http://www.roguebasin.com/index.php?title=Cellular_Automata_Method_for_Generating_Random_Cave-Like_Levels). This chapter will help you create natural looking maps.

‎book/src/chapter_28.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Ever wondered what would happen if an Umber Hulk (or other tunneling creature) got *really* drunk, and went on a dungeon carving bender? The *Drunkard's Walk* algorithm answers the question - or more precisely, what would happen if a *whole bunch* of monsters had far too much to drink. As crazy it sounds, this is a good way to make organic dungeons.

‎book/src/chapter_29.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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A mainstay of dungeon crawl games is the good old-fashioned labyrinth, often featuring a Minotaur. Dungeon Crawl: Stone Soup has a literal minotaur labyrinth, Tome 4 has sand-worm mazes, One Knight has an elven hedge maze. These levels can be annoying for the player, and should be used sparingly: a lot of players don't really enjoy the tedium of exploring to find an exit. This chapter will show you how to make a labyrinth!

‎book/src/chapter_3.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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The remainder of this tutorial will be dedicated to making a Roguelike. [Rogue](https://en.wikipedia.org/wiki/Rogue_(video_game) appeared in 1980, as a text-mode dungeon exploration game. It has spawned an entire genre of "roguelikes": procedurally generated maps, hunting an objective over multiple levels and "permadeath" (restart when you die). The definition is the source of many online fights; I'd rather avoid that!

‎book/src/chapter_30.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Diffusion-Limited Aggregation (DLA) is a fancy name for a constrained form of the drunken walk. It makes organic looking maps, with more of an emphasis on a central area and "arms" coming out of it. With some tricks, it can be made to look quite alien - or quite real. See this [excellent article on Rogue Basin](http://www.roguebasin.com/index.php?title=Diffusion-limited_aggregation).

‎book/src/chapter_31.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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In the previous chapter on Diffusion-Limited Aggregation, we introduced two new concepts for map building: *symmetry* and *brush size*. These readily apply to other algorithms, so we're going to take a moment to move them into library functions (in `map_builders/common.rs`), make them generic, and demonstrate how they can alter the Drunkard's Walk.

‎book/src/chapter_32.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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We've touched on Voronoi diagrams before, in our spawn placement. In this section, we'll use them to make a map. The algorithm basically subdivides the map into regions, and places walls between them. The result is a bit like a hive. You can play with the distance/adjacency algorithm to adjust the results.

‎book/src/chapter_33.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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A few years ago, *Wave Function Collapse* (WFC) exploded onto the procedural generation scene. Apparently magical, it took images in - and made a similar image. Demos showed it spitting out great looking game levels, and the amazing Caves of Qud started using it for generating fun levels. The canonical demonstrations - along with the original algorithm in C# and various explanatory links/ports - may be [found here](https://github.com/mxgmn/WaveFunctionCollapse).

‎book/src/chapter_34.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Despite being essentially pseudorandom (that is, random - but constrained in a way that makes for a fun, cohesive game), *many* roguelikes feature some hand-crafted content. Typically, these can be divided into a few categories:

‎book/src/chapter_35.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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The last chapter was getting overly long, so it was broken into two. In the previous chapter, we learned how to load prefabricated maps and map sections, modified the spawn system so that *meta-builders* could affect the spawn patterns from the previous builder, and demonstrated integration of whole map chunks into levels. In this chapter, we'll explode *room vaults* - prefabricated content that integrates itself into your level. So you might hand-craft some rooms, and have them seamlessly fit into your existing map.

‎book/src/chapter_36.md

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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The last few chapters have introduced an important concept in procedural generation: chained builders. We're happily building a map, calling Wave Function Collapse to mutate the map, calling our `PrefabBuilder` to change it again, and so on. This chapter will formalize this process a bit, expand upon it, and leave you with a framework that lets you *clearly* build new maps by chaining concepts together.

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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Now that we have a nice, clean layering system we'll take the opportunity to play with it a bit. This chapter is a collection of fun things you can do with layers, and will introduce a few new layer types. It's meant to whet your appetite to write more: the sky really is the limit!

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*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
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In the last chapter, we abstracted out room *layout* - but kept the actual placement of the rooms the same: they are always rectangles, although this can be mitigated with room explosion and corner rounding. This chapter will add the ability to use rooms of different shapes.

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