1 files changed, 9 insertions, 12 deletions
diff --git a/src/main.rs b/src/main.rs
index 9855cdc..50320b7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,8 +12,7 @@ use sdl2::rect::Rect;
 use sdl2::render::Texture;
 use sdl2::surface::Surface;
 use std::ops::DerefMut;
-use std::sync::Arc;
-use std::time::Duration;
+use std::time::{Duration, SystemTime};
 
 pub fn main() {
   let sdl_context = sdl2::init().unwrap();
@@ -34,16 +33,15 @@ pub fn main() {
   let mut i = 0;
 
   // amount to incr sin_offset by per frame
-  // TODO: do not bind to framerate u silly bean
-  let sin_speed = 0.0025;
-  let mut sin_offset = 0.5;
+  let start_time = SystemTime::now();
+  let movement_per_second = 0.5;
   'running: loop {
+    let time = SystemTime::now()
+      .duration_since(start_time)
+      .expect("Time went back between frames");
+    let time = f64::from(time.as_millis() as u32) / 1000.0;
     i = (i + 1) % 255;
 
-    if sin_offset > 1.0 {
-      sin_offset -= 1.0;
-    }
-
     canvas.set_draw_color(Color::RGB(12, 12, 12));
     canvas.clear();
 
@@ -73,7 +71,7 @@ pub fn main() {
         let f64_w = f64::from(w);
         let f64_h = f64::from(h);
         let sin_x = {
-          let mut sin_x = f64::from(x) + (sin_offset * f64_w);
+          let mut sin_x = f64::from(x) + ((time * movement_per_second) * f64_w);
           if sin_x > f64_w {
             sin_x = sin_x - f64_w;
           }
@@ -91,7 +89,6 @@ pub fn main() {
           f[idx + 3] = if sin_y < y as usize { 255 } else { 0 };
         }
       }
-      sin_offset += sin_speed;
 
       let sin_texture = Texture::from_surface(&sin_surface, &texture_creator).unwrap();
 
@@ -125,6 +122,6 @@ pub fn main() {
     }
     // The rest of the game loop goes here...
     canvas.present();
-    ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 120));
+    ::std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 12000));
   }
 }