+
+pub struct CircleBoll {
+ pub boll: SquareBoll,
+}
+
+impl CircleBoll {
+ pub fn new(pos: Point2D<f64>, vel: Point2D<f64>) -> CircleBoll {
+ CircleBoll {
+ boll: SquareBoll { pos, vel },
+ }
+ }
+}
+
+impl Boll for CircleBoll {
+ fn update(&mut self) {
+ self.boll.update();
+ }
+
+ fn draw(&self, canvas: &mut Canvas<Window>, size: u32) {
+ let val = 255 - std::cmp::min(255, (self.boll.vel.length() * 20.0) as u8);
+ canvas
+ .filled_circle(
+ self.boll.pos.x as i16,
+ self.boll.pos.y as i16,
+ size as i16,
+ Color::RGBA(val, val, val, 128),
+ )
+ .unwrap();
+ }
+}