2 use sdl2::event::Event;
4 use sdl2::keyboard::Keycode;
5 use sdl2::pixels::Color;
6 use sdl2::render::BlendMode;
7 use sdl2::render::Canvas;
8 use sdl2::video::Window;
10 use {SCREEN_HEIGHT, SCREEN_WIDTH};
13 use sprites::SpriteManager;
16 macro_rules! point { // because I don't know how to import it from common.rs ...
17 ( $x:expr, $y:expr ) => { Point2D { x:$x, y:$y } };
20 pub type Nanoseconds = u64;
23 pub canvas: Canvas<Window>,
24 pub event_pump: EventPump,
25 pub sprites: SpriteManager,
26 pub state: Box<AppState>,
31 let context = sdl2::init().unwrap();
32 sdl2::image::init(sdl2::image::InitFlag::PNG).unwrap();
33 let window = context.video().unwrap().window("SDL test", SCREEN_WIDTH, SCREEN_HEIGHT)
38 context.mouse().show_cursor(false);
39 let mut canvas = window.into_canvas().build().unwrap();
40 canvas.set_blend_mode(BlendMode::Add);
41 canvas.set_draw_color(Color::RGB(0, 0, 0));
44 let event_pump = context.event_pump().unwrap();
45 let sprites = SpriteManager::new(canvas.texture_creator());
50 state: Box::new(ActiveState::new()),
54 pub fn load_sprites(&mut self, sprites: &[(&'static str, &str)]) {
55 for (name, file) in sprites {
56 self.sprites.load(name, file);
62 fn update(&mut self, dt: Nanoseconds);
63 fn render(&self, canvas: &mut Canvas<Window>);
65 fn on_event(&mut self, event: Event);
68 type Bollar = Vec<Box<dyn Boll>>;
70 pub struct ActiveState {
76 fn new() -> ActiveState {
83 fn change_boll_count(&mut self, delta: i32) {
95 fn add_boll(&mut self) {
96 let mut rng = rand::thread_rng();
97 self.bolls.push(Box::new(SquareBoll {
98 pos: point!(rng.gen_range(0, SCREEN_WIDTH) as f64, rng.gen_range(0, SCREEN_HEIGHT) as f64),
99 vel: point!(rng.gen_range(-2.0, 2.0), rng.gen_range(-2.0, 2.0)),
104 impl AppState for ActiveState {
105 fn update(&mut self, dt: Nanoseconds) {
106 for mut b in &mut self.bolls {
111 ns if ns < (NS_PER_FRAME - 90_0000) as u64 => { self.change_boll_count(100) }
112 ns if ns > (NS_PER_FRAME + 90_0000) as u64 => { self.change_boll_count(-100) }
117 fn render(&self, canvas: &mut Canvas<Window>) {
118 for mut b in &self.bolls {
119 b.draw(canvas, self.boll_size);
124 println!("number of bolls: {}", self.bolls.len());
127 fn on_event(&mut self, event: Event) {
129 Event::KeyDown { keycode: Some(Keycode::KpPlus), .. } => { self.boll_size = std::cmp::min(self.boll_size + 1, 32) }
130 Event::KeyDown { keycode: Some(Keycode::KpMinus), .. } => { self.boll_size = std::cmp::max(self.boll_size - 1, 1) }
131 Event::MouseMotion { x, y, .. } => {
132 self.bolls.push(Box::new(CircleBoll::new(
133 point!(x as f64, y as f64),