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71 lines
1.7 KiB
71 lines
1.7 KiB
extern crate glutin_window;
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extern crate graphics;
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extern crate opengl_graphics;
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extern crate piston;
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use glutin_window::GlutinWindow as Window;
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use opengl_graphics::{GlGraphics, OpenGL};
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use piston::event_loop::{EventSettings, Events};
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use piston::input::{RenderArgs, RenderEvent, UpdateArgs, UpdateEvent};
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use piston::window::WindowSettings;
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pub struct App {
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gl: GlGraphics,
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rotation: f64,
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}
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impl App {
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fn render(&mut self, args: &RenderArgs) {
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use graphics::*;
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const GREEN: [f32; 4] = [0.0, 1.0, 0.0, 1.0];
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const RED: [f32; 4] = [1.0, 0.0, 0.0, 1.0];
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let square = rectangle::square(0.0, 0.0, 50.0);
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let rotation = self.rotation;
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let (x, y) = (args.window_size[0] / 2.0, args.window_size[1] / 2.0);
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self.gl.draw(args.viewport(), |c, gl| {
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clear(GREEN, gl);
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let transform = c
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.transform
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.trans(x, y)
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.rot_rad(rotation)
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.trans(-25.0, -25.0);
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rectangle(RED, square, transform, gl);
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})
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}
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fn update(&mut self, args: &UpdateArgs) {
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self.rotation += 2.0 * args.dt;
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}
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}
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fn main() {
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let opengl = OpenGL::V3_2;
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let mut window: Window = WindowSettings::new("spinning-square", [200, 200])
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.graphics_api(opengl)
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.exit_on_esc(true)
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.build()
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.unwrap();
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let mut app = App {
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gl: GlGraphics::new(opengl),
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rotation: 0.0,
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};
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let mut events = Events::new(EventSettings::new());
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while let Some(e) = events.next(&mut window) {
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if let Some(args) = e.render_args() {
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app.render(&args);
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}
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if let Some(args) = e.update_args() {
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app.update(&args);
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}
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}
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}
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