Placeholder for C74.

Cargo.toml

@@ -82,7 +82,8 @@ members = [
     "chapter-70-missiles",
     "chapter-71-logging",
     "chapter-72-textlayers",
-    "chapter-73-systems"
+    "chapter-73-systems",
+    "chapter-74-darkcity"
     ]
 
 [profile.dev]

book/src/chapter_74.md

@@ -0,0 +1,86 @@
+# One Night in the City
+
+---
+
+***About this tutorial***
+
+*This tutorial is free and open source, and all code uses the MIT license - so you are free to do with it as you like. My hope is that you will enjoy the tutorial, and make great games!*
+
+*If you enjoy this and would like me to keep writing, please consider supporting [my Patreon](https://www.patreon.com/blackfuture).*
+
+---
+
+The next level of the game is a dark elven city. The design document is a bit sparse on details, but here's what we know:
+
+* It eventually leads to a portal to the Abyss.
+* Dark elves are infighty, back-stabbing maniacs and should behave as such.
+* Dark elven cities are surprisingly city-like, just deep underground.
+* Lighting will be important.
+
+## Generating a basic city
+
+The `level_builder` function in `map_builder/mod.rs` controls which map algorithm is called for a given level. Add a placeholder entry for a new map type:
+
+```rust
+pub fn level_builder(new_depth: i32, width: i32, height: i32) -> BuilderChain {
+    rltk::console::log(format!("Depth: {}", new_depth));
+    match new_depth {
+        1 => town_builder(new_depth, width, height),
+        2 => forest_builder(new_depth, width, height),
+        3 => limestone_cavern_builder(new_depth, width, height),
+        4 => limestone_deep_cavern_builder(new_depth, width, height),
+        5 => limestone_transition_builder(new_depth, width, height),
+        6 => dwarf_fort_builder(new_depth, width, height),
+        7 => mushroom_entrance(new_depth, width, height),
+        8 => mushroom_builder(new_depth, width, height),
+        9 => mushroom_exit(new_depth, width, height),
+        10 => dark_elf_city(new_depth, width, height),
+        _ => random_builder(new_depth, width, height)
+    }
+}
+```
+
+At the top of the same file, add imports for a new builder module:
+
+```rust
+mod dark_elves;
+use dark_elves::*;
+```
+
+And create the new `map_builders/dark_elves.rs` file with a placeholder builder in it:
+
+```rust
+use super::{BuilderChain, XStart, YStart, AreaStartingPosition, 
+    CullUnreachable, VoronoiSpawning,
+    AreaEndingPosition, XEnd, YEnd, BspInteriorBuilder };
+
+pub fn dark_elf_city(new_depth: i32, width: i32, height: i32) -> BuilderChain {
+    println!("Dark elf builder");
+    let mut chain = BuilderChain::new(new_depth, width, height, "Dark Elven City");
+    chain.start_with(BspInteriorBuilder::new());
+    chain.with(AreaStartingPosition::new(XStart::CENTER, YStart::CENTER));
+    chain.with(CullUnreachable::new());
+    chain.with(AreaStartingPosition::new(XStart::RIGHT, YStart::CENTER));
+    chain.with(AreaEndingPosition::new(XEnd::LEFT, YEnd::CENTER));
+    chain.with(VoronoiSpawning::new());
+    chain
+}
+```
+
+That makes a not-at-all city like map (just a bsp interiors map) - but it's a good start. I chose this as the base builder because it doesn't waste any space. I like to imagine that the city is a big warren of interconnected rooms, with the poorer-elf housing in the dangerous spot (at the top). So we'll populate this level with relatively "normal" dark elves, and their slaves.
+
+## Adding some dark elves
+
+
+
+---
+
+**The source code for this chapter may be found [here](https://github.com/thebracket/rustrogueliketutorial/tree/master/chapter-74-darkcity)**
+
+
+[Run this chapter's example with web assembly, in your browser (WebGL2 required)](https://bfnightly.bracketproductions.com/rustbook/wasm/chapter-74-darkcity)
+---
+
+Copyright (C) 2019, Herbert Wolverson.
+
+---

chapter-74-darkcity/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "chapter-74-darkcity"
+version = "0.1.0"
+authors = ["Herbert Wolverson <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rltk = { version = "0.8.0", features = ["serde"] }
+specs = { version = "0.16.1", features = ["serde"] }
+specs-derive = "0.4.1"
+serde= { version = "^1.0.44", features = ["derive"] }
+serde_json = "^1.0.44"
+lazy_static = "1.4.0"
+regex = "1.3.6"