1 use sdl2::pixels::Color;
4 use sdl2::render::Canvas;
5 use sdl2::video::Window;
7 use {SCREEN_HEIGHT, SCREEN_WIDTH};
12 fn draw(&mut self, canvas: &mut Canvas<Window>, size: u32);
15 pub struct SquareBoll {
16 pub pos: Point2D<f64>,
17 pub vel: Point2D<f64>,
20 impl Boll for SquareBoll {
21 fn update(&mut self) {
26 self.pos.x = -self.pos.x;
27 self.vel.x = -self.vel.x;
29 if self.pos.x > SCREEN_WIDTH as f64 {
30 self.pos.x = SCREEN_WIDTH as f64 - (self.pos.x - SCREEN_WIDTH as f64);
31 self.vel.x = -self.vel.x;
34 self.pos.y = -self.pos.y;
35 self.vel.y = -self.vel.y;
37 if self.pos.y > SCREEN_HEIGHT as f64 {
38 self.pos.y = SCREEN_HEIGHT as f64 - (self.pos.y - SCREEN_HEIGHT as f64);
39 self.vel.y = -self.vel.y;
43 fn draw(&mut self, canvas: &mut Canvas<Window>, size: u32) {
44 canvas.set_draw_color(Color::RGBA(
45 255 - std::cmp::min(255, (self.vel.length() * 25.0) as u8),
46 (255.0 * (self.pos.x / SCREEN_WIDTH as f64)) as u8,
47 (255.0 * (self.pos.y / SCREEN_HEIGHT as f64)) as u8, 128
49 let mut r = Rect::new(0, 0, size, size);
50 r.center_on(Point::new(self.pos.x as i32, self.pos.y as i32));
51 canvas.fill_rect(r).unwrap();