Added NoiseGenerator

README.md

@@ -7,28 +7,27 @@
 Generate procedural maps for games. [Try it in the browser](https://klangner.github.io/mapgen.rs/) using WebAssembly.
 
 
-## Features
+## Map filters
 
-### Dungeons
+This library consists of different map filters which can be combined to create custom map generator.
 
-  * Map generators
-    * [x] BSP Interior
-    * [x] BSP Rooms
-    * [x] Cellular automata
-    * [ ] Diffusion-Limited Aggregation (DLA)
-    * [x] Drunkard's walk
-    * [ ] Maze
-    * [ ] Prefabs
-    * [x] Simple rooms
-    * [ ] Voronoi hive
-    * [ ] Wave Function Collapse
-  * Map modifiers (filters)
-    * [x] Area exit point
-    * [x] Area starting point
-    * [x] Cellular automata
-    * [x] Cull unreachable areas
-    * [x] Room corridors nearest
-    * [ ] Voronoi spawning
+### Implemented filters
+
+  * [x] Area exit point
+  * [x] Area starting point
+  * [x] BSP Interior
+  * [x] BSP Rooms
+  * [x] Cellular automata
+  * [x] Cull unreachable areas
+  * [ ] Diffusion-Limited Aggregation (DLA)
+  * [x] Drunkard's walk
+  * [ ] Maze
+  * [x] Noise generator
+  * [ ] Prefabs
+  * [x] Room corridors nearest
+  * [x] Simple rooms
+  * [ ] Voronoi hive
+  * [ ] Wave Function Collapse
 
 
 ## Usage

demo/README.md

@@ -5,7 +5,13 @@
 ```
 wasm-pack build
 cd www
-npm run start
+npm run server
+```
+
+Deply application
+```
+cd www
+npm run deploy
 ```
 
 This app uses:

demo/src/lib.rs

@@ -2,16 +2,7 @@ use wasm_bindgen::prelude::*;
 use web_sys;
 use rand::prelude::*;
 use mapgen::{MapBuilder, TileType};
-use mapgen::filter::{
-    CellularAutomata,
-    SimpleRooms,
-    BspInterior,
-    {AreaStartingPosition, XStart, YStart},
-    CullUnreachable,
-    DistantExit,
-    NearestCorridors,
-    DrunkardsWalk,
-};
+use mapgen::filter::*;
 
 
 #[wasm_bindgen]
@@ -36,6 +27,7 @@ impl World {
         World::print_map_info(format!("Cellular Automata with the seed: {}", seed));
         let mut rng = StdRng::seed_from_u64(seed as u64);
         let map = MapBuilder::new()
+            .with(NoiseGenerator::uniform())
             .with(CellularAutomata::new())
             .with(AreaStartingPosition::new(XStart::CENTER, YStart::CENTER))
             .with(CullUnreachable::new())

demo/www/package.json

@@ -8,7 +8,7 @@
   },
   "scripts": {
     "build": "webpack --config webpack.config.js",
-    "start": "webpack-dev-server",
+    "server": "webpack-dev-server",
     "deploy": "gh-pages -d dist"
   },
   "repository": {

src/filter/cellular_automata.rs

@@ -1,12 +1,12 @@
-//! Cellular automata map generator and modifier.
+//! Cellular automata map filter.
 //! 
 //! Check this [article](http://www.roguebasin.com/index.php?title=Cellular_Automata_Method_for_Generating_Random_Cave-Like_Levels)
 //! for more information about the algorithm behind this generator.
 //! 
-//! Since this algorithm works in interations it is possible to take existing map 
-//! and apply single interaction to it. This is the idea behind MapModifier implementation.
+//! This algorithm requires that map first is filtered with some noise.
+//! For example `UniformNoise`. It can also be apply to any other non empty map.
 //! 
-//! Example generator usage:
+//! Example usage:
 //! ```
 //! use rand::prelude::*;
 //! use mapgen::{Map, MapFilter};
@@ -26,35 +26,27 @@ use crate::MapFilter;
 use crate::{Map, TileType};
 
 
-/// Map generator and modifier
-pub struct CellularAutomata {}
+/// Map filter
+pub struct CellularAutomata {
+    num_iteraction: u32,
+}
 
 impl MapFilter for CellularAutomata {
-    fn modify_map(&self, rng: &mut StdRng, map: &Map)  -> Map {
-        self.build(map, rng)
+    fn modify_map(&self, _rng: &mut StdRng, map: &Map)  -> Map {
+        self.build(map)
     }
 }
 
 impl CellularAutomata {
     /// Create generator which will create map with the given dimension.
     pub fn new() -> Box<CellularAutomata> {
-        Box::new(CellularAutomata {})
+        Box::new(CellularAutomata { num_iteraction: 15})
     }
 
     /// Generate map
-    fn build(&self, map: &Map, rng: &mut StdRng) -> Map {
+    fn build(&self, map: &Map) -> Map {
         let mut new_map = map.clone();
-        // First we completely randomize the map, setting 55% of it to be floor.
-        for y in 1..new_map.height-1 {
-            for x in 1..new_map.width-1 {
-                let roll = rng.next_u32() % 100;
-                if roll > 55 { new_map.set_tile(x, y, TileType::Floor) } 
-                else { new_map.set_tile(x, y, TileType::Wall) }
-            }
-        }
-
-        // Now we iteratively apply cellular automata rules
-        for _ in 0..15 {
+        for _ in 0..self.num_iteraction {
             new_map = apply_iteration(&new_map);
         }
 

src/filter/mod.rs

@@ -10,12 +10,14 @@
 //! ```
 //! use mapgen::{MapFilter, MapBuilder, Map, TileType};
 //! use mapgen::filter::{
+//!     NoiseGenerator,
 //!     CellularAutomata,
 //!     starting_point::{AreaStartingPosition, XStart, YStart}
 //! };
 //! use mapgen::geometry::Point;
 //! 
 //! let map = MapBuilder::new()
+//!             .with(NoiseGenerator::uniform())
 //!             .with(CellularAutomata::new())
 //!             .with(AreaStartingPosition::new(XStart::CENTER, YStart::CENTER))
 //!             .build_map(80, 50);
@@ -32,6 +34,7 @@ pub mod cellular_automata;
 pub mod cull_unreachable;
 pub mod distant_exit;
 pub mod drunkard;
+pub mod noise_generator;
 pub mod simple_rooms;
 pub mod rooms_corridors_nearest;
 pub mod starting_point;
@@ -42,6 +45,7 @@ pub use cellular_automata::CellularAutomata;
 pub use cull_unreachable::CullUnreachable;
 pub use distant_exit::DistantExit;
 pub use drunkard::DrunkardsWalk;
+pub use noise_generator::NoiseGenerator;
 pub use simple_rooms::SimpleRooms;
 pub use rooms_corridors_nearest::NearestCorridors;
 pub use starting_point::{AreaStartingPosition, XStart, YStart};

src/filter/noise_generator.rs

@@ -0,0 +1,65 @@
+//! Apply noise to the map.
+//! Each cell will be set to Floor with the given probabilty.
+//! 
+//! Example usage:
+//! ```
+//! use rand::prelude::*;
+//! use mapgen::{Map, MapFilter};
+//! use mapgen::filter::NoiseGenerator;
+//! 
+//! let mut rng = StdRng::seed_from_u64(100);
+//! let gen = NoiseGenerator::uniform();
+//! let map = gen.modify_map(&mut rng, &Map::new(80, 50));
+//! 
+//! assert_eq!(map.width, 80);
+//! assert_eq!(map.height, 50);
+//! ```
+//! 
+
+use rand::prelude::*;
+use crate::MapFilter;
+use crate::{Map, TileType};
+
+
+/// Map noise generator
+pub struct NoiseGenerator {
+    prob: f32,
+}
+
+impl MapFilter for NoiseGenerator {
+    fn modify_map(&self, rng: &mut StdRng, map: &Map)  -> Map {
+        self.build(map, rng)
+    }
+}
+
+impl NoiseGenerator {
+    /// Create noise with custom probability
+    pub fn new(prob: f32) -> Box<NoiseGenerator> {
+        Box::new(NoiseGenerator {
+            prob,
+        })
+    }
+
+    /// Create uniform noise (Probablity 0.5)
+    pub fn uniform() -> Box<NoiseGenerator> {
+        Box::new(NoiseGenerator {
+            prob: 0.5,
+        })
+    }
+
+    /// Generate map
+    fn build(&self, map: &Map, rng: &mut StdRng) -> Map {
+        let mut new_map = map.clone();
+        let p = (self.prob * 100.0) as u32;
+        for y in 1..new_map.height-1 {
+            for x in 1..new_map.width-1 {
+                let roll = rng.next_u32() % 100;
+                if roll > p { new_map.set_tile(x, y, TileType::Floor) } 
+                else { new_map.set_tile(x, y, TileType::Wall) }
+            }
+        }
+
+        new_map
+    }
+
+}

src/lib.rs

@@ -10,12 +10,14 @@
 //! ```
 //! use mapgen::{MapFilter, MapBuilder, Map, TileType};
 //! use mapgen::filter::{
+//!     NoiseGenerator,
 //!     CellularAutomata,
 //!     starting_point::{AreaStartingPosition, XStart, YStart}
 //! };
 //! use mapgen::geometry::Point;
 //! 
 //! let map = MapBuilder::new()
+//!             .with(NoiseGenerator::uniform())
 //!             .with(CellularAutomata::new())
 //!             .with(AreaStartingPosition::new(XStart::CENTER, YStart::CENTER))
 //!             .build_map(80, 50);
@@ -31,6 +33,7 @@ pub mod geometry;
 pub mod map;
 
 pub use map::{Map, Symmetry, TileType};
+pub use filter::*;
 
 pub (crate) mod dijkstra;
 pub (crate) mod random;
@@ -90,12 +93,16 @@ impl MapBuilder {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use filter::CellularAutomata;
-    use filter::{AreaStartingPosition, XStart, YStart};
+    use filter::{
+        CellularAutomata,
+        NoiseGenerator,
+        {AreaStartingPosition, XStart, YStart},
+    };
 
     #[test]
     fn test_ca_map() {
         let map = MapBuilder::new()
+            .with(NoiseGenerator::new(0.55))
             .with(CellularAutomata::new())
             .with(AreaStartingPosition::new(XStart::CENTER, YStart::CENTER))
             .build_map(80, 50);