fix flickering and add movement

src/lib.rs

@@ -71,7 +71,7 @@ impl Iterator for Events {
 
 pub struct Sprite {
     rect: Rect,
-    surf: Surface<'static>
+    surf: Surface<'static>,
 }
 
 impl Sprite {
@@ -84,11 +84,14 @@ impl Sprite {
 
         Ok(Self {
             rect: dest_rect,
-            surf
+            surf,
         })
     }
 
     pub fn draw(&self, canvas: &mut Canvas<Window>, events: &Events) -> Result<()> {
+        canvas.fill_rect(None)?;
+        canvas.clear();
+
         let mut surface = canvas.window().surface(events.as_ref())?;
 
         self.surf.blit(None, &mut *surface, self.rect)?;
@@ -97,6 +100,14 @@ impl Sprite {
 
         Ok(())
     }
+
+    pub fn translate(&mut self, position: (i32, i32)) {
+        let new_x = self.rect.x() - position.0;
+        let new_y = self.rect.y() - position.1;
+
+        self.rect.set_x(new_x);
+        self.rect.set_y(new_y);
+    }
 }
 
 pub struct Game {
@@ -127,18 +138,21 @@ impl Game {
 
         let mut canvas = window.into_canvas().build()?;
 
-        let mut event_pump = sdl_context.event_pump()?;
+        let event_pump = sdl_context.event_pump()?;
 
         let mut events = Events {
             pump: event_pump
         };
 
+
         loop {
             if self.stopped.get() {
                 break;
             }
+            canvas.set_draw_color(Color::RGB(0, 0, 0));
+            canvas.clear();
             func(&mut canvas, &mut events);
-            canvas.present();
+            // canvas.present();
         }
 
         Ok(())

src/main.rs

@@ -4,7 +4,7 @@ fn main() {
     let game = Game::new("catbox demo", 1000, 800);
 
     let mut i = 0;
-    let s = Sprite::new("/home/yashkarandikar/code/catbox/duck.png", 500, 400).unwrap();
+    let mut s = Sprite::new("/home/yashkarandikar/code/catbox/duck.png", 500, 400).unwrap();
     game.run(|canvas, event_pump| {
         i = (i + 1) % 255;
         // canvas.set_draw_color(catbox::Color::RGB(i, 64, 255));
@@ -22,6 +22,18 @@ fn main() {
                     keycode: Some(Keycode::Escape),
                     ..
                 } => game.terminate(),
+
+                Event::KeyDown { keycode, .. } => {
+                    let offset = match keycode.unwrap() {
+                        Keycode::W | Keycode::Up => (0, 5),
+                        Keycode::S | Keycode::Down => (0, -5),
+                        Keycode::A | Keycode::Left => (-5, 0),
+                        Keycode::D | Keycode::Right => (5, 0),
+                        _ => (0, 0)
+                    };
+
+                    s.translate(offset);
+                }
                 _ => {}
             }
         }