Commit | Line | Data |
---|---|---|
296187ca TW |
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 struct Boll { | |
11 | pub pos: Point2D<f64>, | |
12 | pub vel: Point2D<f64>, | |
13 | } | |
14 | ||
15 | impl Boll { | |
16 | pub fn update(&mut self) { | |
17 | self.vel.y += 0.1; | |
18 | self.pos += self.vel; | |
19 | ||
20 | if self.pos.x < 0.0 { | |
21 | self.pos.x = -self.pos.x; | |
22 | self.vel.x = -self.vel.x; | |
23 | } | |
24 | if self.pos.x > SCREEN_WIDTH as f64 { | |
25 | self.pos.x = SCREEN_WIDTH as f64 - (self.pos.x - SCREEN_WIDTH as f64); | |
26 | self.vel.x = -self.vel.x; | |
27 | } | |
28 | if self.pos.y < 0.0 { | |
29 | self.pos.y = -self.pos.y; | |
30 | self.vel.y = -self.vel.y; | |
31 | } | |
32 | if self.pos.y > SCREEN_HEIGHT as f64 { | |
33 | self.pos.y = SCREEN_HEIGHT as f64 - (self.pos.y - SCREEN_HEIGHT as f64); | |
34 | self.vel.y = -self.vel.y; | |
35 | } | |
36 | } | |
37 | ||
38 | pub fn draw(&mut self,canvas: &mut Canvas<Window>, size: u32) { | |
39 | canvas.set_draw_color(Color::RGBA( | |
40 | 255 - std::cmp::min(255, (self.vel.length() * 25.0) as u8), | |
41 | (255.0 * (self.pos.x / SCREEN_WIDTH as f64)) as u8, | |
42 | (255.0 * (self.pos.y / SCREEN_HEIGHT as f64)) as u8, 128 | |
43 | )); | |
44 | let mut r = Rect::new(0, 0, size, size); | |
45 | r.center_on(Point::new(self.pos.x as i32, self.pos.y as i32)); | |
46 | canvas.fill_rect(r).unwrap(); | |
47 | } | |
48 | } |