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