commit d19dbf96fd9ad0498235e5f08ac5a24c80a1dfc5
Author: Niko Abeler <niko@rerere.org>
Date:   Fri Dec 30 21:07:36 2022 +0100

    can createa a map

diff --git a/.gitignore b/.gitignore
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index 0000000..130bb75
--- /dev/null
+++ b/.gitignore
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+
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# debug output
+world.png
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a7665da
--- /dev/null
+++ b/Cargo.toml
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+[package]
+name = "tavern_keeper"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+noise = { version = "0.8.2", features = ["images"] }
+rand = "0.8.5"
+image = "0.24.5"
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diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..13a6d94
--- /dev/null
+++ b/src/main.rs
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+use noise::{Perlin, ScalePoint, Add, NoiseFn, Multiply, ScaleBias};
+use noise::utils::{NoiseMapBuilder, PlaneMapBuilder};
+use image::{RgbImage, Rgb};
+use rand::prelude::*;
+
+struct BorderNoise {
+    pub center: [f64; 2],
+    pub radius: f64,
+    pub falloff: f64,
+}
+
+impl BorderNoise {
+    pub fn new(center: [f64; 2], radius: f64, falloff: f64) -> BorderNoise {
+        BorderNoise {
+            center: center,
+            radius: radius,
+            falloff: falloff
+        }
+    }
+}
+
+impl NoiseFn<f64, 2> for BorderNoise {
+    fn get(&self, _point: [f64; 2]) -> f64 {
+        let dist = (
+            (self.center[0] - _point[0]).powi(2) +
+            (self.center[1] - _point[1]).powi(2)
+        ).sqrt();
+        if dist > self.radius {
+            1.0 - ((dist - self.radius) * self.falloff)
+        } else {
+            1.0
+        }
+    }
+}
+
+fn main() {
+
+    let mut rng = rand::thread_rng();
+
+    let map_size = 256;
+    let map_center = map_size / 2;
+    let height = Add::new(
+        ScaleBias::new(
+            Add::new(
+                ScalePoint::new(Perlin::new(rng.gen::<u32>()))
+                    .set_x_scale(0.04)
+                    .set_y_scale(0.04),
+                ScalePoint::new(Perlin::new(rng.gen::<u32>()))
+                    .set_x_scale(0.011)
+                    .set_y_scale(0.011),        
+            ),
+        ).set_scale(2000.0).set_bias(1000.0),
+        BorderNoise::new(
+            [map_center as f64, map_center as f64],
+            map_size as f64 * 0.4,
+            100.0
+        ),
+    );
+
+    let plane = PlaneMapBuilder::<_, 2>::new(&height)
+        .set_size(map_size, map_size)
+        .set_x_bounds(0.0, map_size as f64)
+        .set_y_bounds(0.0, map_size as f64)
+        .build();
+
+    let min = plane.iter().fold(f64::MAX, |min, &val| val.min(min));
+    let max = plane.iter().fold(f64::MIN, |max, &val| val.max(max));
+
+    println!("Min: {}", min);
+    println!("Max: {}", max);
+
+
+    let mut img = RgbImage::new(map_size as u32, map_size as u32);
+
+    for x in 0..map_size {
+        for y in 0..map_size {
+            let h = plane.get_value(x, y);
+            if h < -2000.0 {
+                // deep ocean
+                img.put_pixel(x as u32, y as u32, Rgb([20, 60, 255]));
+            } else if h < 0.0 {
+                // ocean
+                img.put_pixel(x as u32, y as u32, Rgb([20, 120, 255]));
+            } else if h < 10.0 {
+                // beach
+                img.put_pixel(x as u32, y as u32, Rgb([255, 255, 100]));
+            } else if h < 1000.0 {
+                // grass
+                img.put_pixel(x as u32, y as u32, Rgb([0, 204, 0]));
+            } else if h < 2000.0 {
+                // hills
+                img.put_pixel(x as u32, y as u32, Rgb([102, 153, 0]));
+            } else if h < 3500.0 {
+                // mountains
+                img.put_pixel(x as u32, y as u32, Rgb([153, 153, 102]));
+            } else {
+                // snow
+                img.put_pixel(x as u32, y as u32, Rgb([230, 230, 230]));
+            }
+        }
+    }
+    img.save("world.png").unwrap();
+
+
+
+}
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