Add worley noise optional feature

Cargo.toml

@@ -41,7 +41,7 @@ mysql = { version = "20.0", optional = true }
 dashmap = { version = "4.0", optional = true }
 zip = { version = "0.5.8", optional = true }
 rand = {version = "0.8", optional = true}
-
+dmsort = {version = "1.0.0", optional = true}
 
 [features]
 default = ["cellularnoise", "dmi", "file", "git", "http", "json", "log", "noise", "sql", "url"]
@@ -60,6 +60,7 @@ url = ["url-dep", "percent-encoding"]
 # non-default features
 hash = ["base64", "const-random", "md-5", "hex", "sha-1", "sha2",  "twox-hash"]
 unzip = ["zip", "jobs"]
+worleynoise = ["rand","dmsort"]
 
 # internal feature-like things
 jobs = ["flume"]

README.md

@@ -93,6 +93,7 @@ Additional features are:
 * hash: Faster replacement for `md5`, support for SHA-1, SHA-256, and SHA-512. Requires OpenSSL on Linux.
 * url: Faster replacements for `url_encode` and `url_decode`.
 * unzip: Function to download a .zip from a URL and unzip it to a directory.
+* worleynoise: Function that generates a type of nice looking cellular noise, more expensive than cellularnoise
 
 ## Installing
 

src/lib.rs

@@ -30,6 +30,8 @@ pub mod sql;
 pub mod unzip;
 #[cfg(feature = "url")]
 pub mod url;
+#[cfg(feature = "worleynoise")]
+pub mod worleynoise;
 
 #[cfg(not(target_pointer_width = "32"))]
 compile_error!("rust-g must be compiled for a 32-bit target");

src/worleynoise.rs

@@ -0,0 +1,229 @@
+use crate::error::Result;
+use rand::*;
+use std::fmt::Write;
+use std::rc::Rc;
+
+byond_fn! { worley_generate(region_size, threshold, node_per_region_chance, width, height) {
+    worley_noise(region_size, threshold, node_per_region_chance, width, height).ok()
+} }
+
+// This is a quite complex algorithm basically what it does is it creates 2 maps, one filled with cells and the other with 'regions' that map onto these cells.
+// Each region can spawn 1 node, the cell then determines wether it is true or false depending on the distance from it to the nearest node in the region minus the second closest node.
+// If this distance is greater than the threshold then the cell is true, otherwise it is false.
+fn worley_noise(
+    str_reg_size: &str,
+    str_positive_threshold: &str,
+    str_node_per_region_chance: &str,
+    str_width: &str,
+    str_height: &str,
+) -> Result<String> {
+    let region_size = str_reg_size.parse::<i32>()?;
+    let positive_threshold = str_positive_threshold.parse::<f32>()?;
+    let width = str_width.parse::<i32>()?;
+    let height = str_height.parse::<i32>()?;
+    let node_per_region_chance = str_node_per_region_chance.parse::<f32>()?;
+
+    //i fucking mixed up width and height again. it really doesnt matter but here is a comment just warning you.
+    let mut map = Map::new(region_size, height, width, node_per_region_chance);
+
+    map.generate_noise(positive_threshold as f32);
+
+    let mut output = String::new();
+
+    for row in map.cell_map {
+        for cell in row {
+            if cell.value {
+                let _ = write!(output, "1");
+            } else {
+                let _ = write!(output, "0");
+            }
+        }
+    }
+    Ok(output)
+}
+
+struct Map {
+    region_size: i32,
+    region_map: Vec<Vec<Rc<Region>>>,
+    cell_map: Vec<Vec<Cell>>,
+    cell_map_width: i32,
+    cell_map_height: i32,
+    node_chance: f32,
+}
+
+impl Map {
+    fn new(region_size: i32, cell_map_width: i32, cell_map_height: i32, node_chance: f32) -> Map {
+        let mut map = Map {
+            region_size: region_size,
+            region_map: Vec::new(),
+            cell_map: Vec::new(),
+            cell_map_width: cell_map_width,
+            cell_map_height: cell_map_height,
+            node_chance: node_chance,
+        };
+
+        map.init_regions();
+
+        for x in 0..cell_map_width {
+            map.cell_map.push(Vec::new());
+            for y in 0..cell_map_height {
+                let cell = Cell::new(
+                    x,
+                    y,
+                    map.region_map[(x / region_size) as usize][(y / region_size) as usize].clone(),
+                );
+                map.cell_map[(x) as usize].push(cell);
+            }
+        }
+        map
+    }
+    fn init_regions(&mut self) {
+        let mut rng = rand::thread_rng();
+
+        let regions_x = self.cell_map_width / self.region_size;
+        let regions_y = self.cell_map_height / self.region_size;
+        //those two variables ensure that we dont EVER panic due to not having enough nodes spawned for the distance algorithm to function.
+        let mut node_count = 0;
+        let mut distance_in_regions_since_last_node = 0;
+
+        for i in 0..regions_x {
+            distance_in_regions_since_last_node += 1;
+            self.region_map.push(Vec::new());
+            for j in 0..regions_y {
+                distance_in_regions_since_last_node += 1;
+                let mut region = Region::new(i, j);
+                if rng.gen_range(0..100) as f32 <= self.node_chance || node_count < 2 {
+                    let xcord = rng.gen_range(0..self.region_size);
+                    let ycord = rng.gen_range(0..self.region_size);
+                    let node =
+                        Node::new(xcord + i * self.region_size, ycord + j * self.region_size);
+                    region.node = Some(node);
+                    node_count += 1;
+                    distance_in_regions_since_last_node = 0;
+                }
+
+                if distance_in_regions_since_last_node > 3 {
+                    node_count = 0;
+                }
+
+                let rcregion = Rc::new(region);
+
+                self.region_map[i as usize].push(rcregion);
+            }
+        }
+    }
+
+    fn get_regions_in_bound(&self, x: i32, y: i32, radius: i32) -> Vec<&Region> {
+        let mut regions = Vec::new();
+        let x_min = x - radius;
+        let x_max = x + radius;
+        let y_min = y - radius;
+        let y_max = y + radius;
+        for i in x_min..x_max {
+            for j in y_min..y_max {
+                let region_x = i;
+                let region_y = j;
+                if region_x >= 0
+                    && region_x < self.region_map.len() as i32
+                    && region_y >= 0
+                    && region_y < self.region_map[region_x as usize].len() as i32
+                {
+                    let region = &self.region_map[region_x as usize][region_y as usize];
+                    regions.push(region.as_ref());
+                }
+            }
+        }
+        regions
+    }
+
+    fn generate_noise(&mut self, threshold: f32) {
+        for i in 0..self.cell_map.len() {
+            for j in 0..self.cell_map[i as usize].len() {
+                let cell = &self.cell_map[i as usize][j as usize];
+                let region = &self.region_map[cell.region.as_ref().reg_x as usize]
+                    [cell.region.as_ref().reg_y as usize];
+                let neighbours = self.get_regions_in_bound(region.reg_x, region.reg_y, 3);
+
+                let mut node_vec = Vec::new();
+                for neighbour in neighbours {
+                    if neighbour.node.is_some() {
+                        let node = neighbour.node.as_ref().unwrap();
+                        node_vec.push(node);
+                    }
+                }
+
+                dmsort::sort_by(&mut node_vec, |a, b| {
+                    quick_distance_from_to(cell.x, cell.y, a.x, a.y)
+                        .partial_cmp(&quick_distance_from_to(cell.x, cell.y, b.x, b.y))
+                        .unwrap()
+                });
+                let dist = distance_from_to(cell.x, cell.y, node_vec[0].x, node_vec[0].y)
+                    - distance_from_to(cell.x, cell.y, node_vec[1].x, node_vec[1].y);
+                //
+                let mutable_cell = &mut self.cell_map[i as usize][j as usize];
+                if dist.abs() > threshold {
+                    mutable_cell.value = true;
+                }
+            }
+        }
+    }
+}
+
+fn distance_from_to(x1: i32, y1: i32, x2: i32, y2: i32) -> f32 {
+    let x_diff = x1 - x2;
+    let y_diff = y1 - y2;
+    let distance = (((x_diff * x_diff) + (y_diff * y_diff)) as f32).sqrt();
+    distance
+}
+
+fn quick_distance_from_to(x1: i32, y1: i32, x2: i32, y2: i32) -> f32 {
+    let x_diff = x1 - x2;
+    let y_diff = y1 - y2;
+    let distance = (x_diff.abs() + y_diff.abs()) as f32;
+    distance
+}
+
+struct Cell {
+    x: i32,
+    y: i32,
+    value: bool,
+    region: Rc<Region>,
+}
+
+impl Cell {
+    fn new(x: i32, y: i32, region: Rc<Region>) -> Cell {
+        Cell {
+            x: x,
+            y: y,
+            value: false,
+            region: region,
+        }
+    }
+}
+
+struct Region {
+    reg_x: i32,
+    reg_y: i32,
+    node: Option<Node>,
+}
+
+impl Region {
+    fn new(reg_x: i32, reg_y: i32) -> Region {
+        Region {
+            reg_x: reg_x,
+            reg_y: reg_y,
+            node: None,
+        }
+    }
+}
+
+struct Node {
+    x: i32,
+    y: i32,
+}
+
+impl Node {
+    fn new(x: i32, y: i32) -> Node {
+        Node { x: x, y: y }
+    }
+}