NaN

mas/fractals/mandel/src/main.rs

@@ -13,8 +13,10 @@ fn main() {
     let height: u32 = args[2].parse::<u32>().unwrap();
     println!("{} {}", width, height);
     */
-    let (width, height) = (640, 480);
+    let (width, height) = (640, 640);
-    let (xr, yr) = ([0, 320], [0, 240]);
+    let (xr, yr) = ([-2.0, 0.47], [-2.12, 2.12]);
+    let theta = 0.01;
+    let scale = 100.0;
     let depth = 100;
     
     let (window, ctx, vid_sys) = render::create_window("Mandelbrot set", width, height);
@@ -25,6 +27,7 @@ fn main() {
     canvas.present();
 
     // render stuff
+    /*
     println!("Init mandel render");
     for dx in xr[0]..xr[1] {
         for dy in yr[0]..yr[1] {
@@ -34,6 +37,42 @@ fn main() {
             canvas.present();
         }
     }
+    */
+    let (mut dx, mut dy) = (xr[0], yr[0]);
+    let (mut x, mut y) = (0.0, 0.0);
+    let mut tempx = 0.0;
+    let col: Color; // color buffer
+    while dx <= xr[1] {
+        dy = yr[0];
+        while dy <= yr[1] {
+            let col: Color = mandel::get_point_color(dx, dy, depth); 
+            /*
+                xtemp := x*x - y*y + x0
+                y := 2*x*y + y0
+                x := xtemp
+            */
+
+            tempx = x*x - y*y + xr[0];
+            y = 2.0*x*y + yr[0];
+            x = tempx;
+
+            // scale coords and apply offsets
+            /*
+            x = dx as f64 * scale;
+            x += (width as f64)/2.0;
+
+            y = dy as f64 * scale;
+            y += (height as f64)/2.0;
+            */
+
+            // render pixel
+            render::set_pixel(&mut canvas, x as i32, y as i32, col);
+            println!("({dx} {dy}) - {x} {y}: {col:?}");
+            dy += theta;
+        }
+        dx += theta;
+        canvas.present();
+    }
     println!("Post mandel render");
 
     let mut event_pump = ctx.event_pump().unwrap();

mas/fractals/mandel/src/mandel.rs

@@ -24,16 +24,16 @@ fn mandel(n: u64, c: Complex64) -> Complex64 {
     }
 }
 
-pub fn get_point_color(x: i32, y: i32, depth: u64) -> Color {
+pub fn get_point_color(x: f32, y: f32, depth: u64) -> Color {
     let c = Complex64::new(x.into(), y.into());
     let mut z = mandel(depth, c);
     let mut norm = z.re*z.re + z.im*z.im;
 
-    println!("{:?} {:?} < 2?", z, norm);
+    //println!("{:?} {:?} < 2?", z, norm);
     
-    if norm < 4.0 {
+    if norm < 2.0 {
         return Color::RGB(0, 0, 0);
     } else {
-        return Color::RGB(25, 25, 25);
+        return Color::RGB(250, 250, 250);
     }
 }