basic/
basic.rs

1extern crate sdl2_mt;
2
3use sdl2_mt::event::Event::*;
4use sdl2_mt::event::WindowEvent;
5use sdl2_mt::keyboard::Keycode;
6use sdl2_mt::pixels::Color;
7
8use std::sync::mpsc;
9use std::thread::sleep;
10use std::time::Duration;
11
12fn main() {
13    //sdlh is "sdl handle"
14    let sdlh = sdl2_mt::init();
15
16    let window = sdlh.create_simple_window("2D plot", 720, 720).unwrap();
17
18    // example of running arbitrary code on the UI thread
19    sdlh.run_on_ui_thread(Box::new(move |_sdl, windows| {
20        let canvas = windows.get_mut(&window).unwrap();
21        canvas.set_draw_color(Color::RGBA(128, 128, 128, 255));
22        canvas.clear();
23        canvas.present();
24    })).unwrap();
25
26    // create a channel we can use to easily break the loop
27    // from inside the closure.
28    let (tx, rx) = mpsc::channel();
29    while rx.try_recv().is_err() {
30        let tx = tx.clone();
31
32        // handle any new UI events that have happened
33        sdlh.handle_ui_events(Box::new(move |_sdl, windows, event| {
34            match event {
35                &Quit { .. } | &KeyDown { keycode: Some(Keycode::Escape), .. } => {
36                    // send a message to rx to cancel the loop
37                    tx.send(()).unwrap();
38                },
39
40                &KeyDown { keycode: Some(keycode), .. } => {
41                    use sdl2_mt::video::WindowPos::Positioned;
42                    let mut canvas = windows.get_mut(&window).unwrap();
43                    let (mut x, mut y) = canvas.window().position();
44                    match keycode {
45                        Keycode::Up    => y -= 5,
46                        Keycode::Down  => y += 5,
47                        Keycode::Left  => x -= 5,
48                        Keycode::Right => x += 5,
49                        _ => {}
50                    }
51                    canvas.window_mut().set_position(Positioned(x), Positioned(y));
52                },
53
54                &Window { win_event: WindowEvent::Resized(new_w, new_h), .. } => {
55                    let mut canvas = windows.get_mut(&window).unwrap();
56                    canvas.set_draw_color(Color::RGBA(128, (new_h % 256) as u8, (new_w % 256) as u8, 255));
57                    canvas.clear();
58                    canvas.present();
59                },
60                
61                // false means "this event handler function did not handle this event"
62                // in a multithreaded application, you might have an event handler per window.
63                // this makes it easier to juggle events between handlers.
64                _ => return false
65            }
66            // true means we handled this event
67            true
68        })).unwrap();
69
70        // keep the CPU usage down
71        sleep(Duration::from_millis(15));
72    }
73
74    // not strictly necessary, since when the main thread exits in Rust the entire program is killed.
75    // the exit() function has the effect of terminating the SDL2 UI thread.
76    sdlh.exit().unwrap();
77}
basic/basic.rs

basic/
basic.rs
