Data commit

Task/Julia-set/Rust/julia-set.rust

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+extern crate image;
+
+use image::{ImageBuffer, Pixel, Rgb};
+
+fn main() {
+    // 4 : 3 ratio is nice
+    let width = 8000;
+    let height = 6000;
+
+    let mut img = ImageBuffer::new(width as u32, height as u32);
+
+    // constants to tweak for appearance
+    let cx = -0.9;
+    let cy = 0.27015;
+    let iterations = 110;
+
+    for x in 0..width {
+        for y in 0..height {
+            let inner_height = height as f32;
+            let inner_width = width as f32;
+            let inner_y = y as f32;
+            let inner_x = x as f32;
+
+            let mut zx = 3.0 * (inner_x - 0.5 * inner_width) / (inner_width);
+            let mut zy = 2.0 * (inner_y - 0.5 * inner_height) / (inner_height);
+
+            let mut i = iterations;
+
+            while zx * zx + zy * zy < 4.0 && i > 1 {
+                let tmp = zx * zx - zy * zy + cx;
+                zy = 2.0 * zx * zy + cy;
+                zx = tmp;
+                i -= 1;
+            }
+
+            // guesswork to make the rgb color values look okay
+            let r = (i << 3) as u8;
+            let g = (i << 5) as u8;
+            let b = (i << 4) as u8;
+            let pixel = Rgb::from_channels(r, g, b, 0);
+            img.put_pixel(x as u32, y as u32, pixel);
+        }
+    }
+
+    let _ = img.save("output.png");
+
+}