| 1 | use sdl2::pixels::Color; |
| 2 | use sdl2::rect::Point; |
| 3 | use sdl2::rect::Rect; |
| 4 | use sdl2::render::Canvas; |
| 5 | use sdl2::video::Window; |
| 6 | |
| 7 | use {SCREEN_HEIGHT, SCREEN_WIDTH}; |
| 8 | use common::Point2D; |
| 9 | |
| 10 | pub trait Boll { |
| 11 | fn update(&mut self); |
| 12 | fn draw(&mut self, canvas: &mut Canvas<Window>, size: u32); |
| 13 | } |
| 14 | |
| 15 | pub struct SquareBoll { |
| 16 | pub pos: Point2D<f64>, |
| 17 | pub vel: Point2D<f64>, |
| 18 | } |
| 19 | |
| 20 | impl Boll for SquareBoll { |
| 21 | fn update(&mut self) { |
| 22 | self.vel.y += 0.1; |
| 23 | self.pos += self.vel; |
| 24 | |
| 25 | if self.pos.x < 0.0 { |
| 26 | self.pos.x = -self.pos.x; |
| 27 | self.vel.x = -self.vel.x; |
| 28 | } |
| 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; |
| 32 | } |
| 33 | if self.pos.y < 0.0 { |
| 34 | self.pos.y = -self.pos.y; |
| 35 | self.vel.y = -self.vel.y; |
| 36 | } |
| 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; |
| 40 | } |
| 41 | } |
| 42 | |
| 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 |
| 48 | )); |
| 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(); |
| 52 | } |
| 53 | } |