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use viewport::Viewport;
use Input;
#[derive(Copy, Clone, PartialEq, Debug, RustcDecodable, RustcEncodable)]
pub struct RenderArgs {
pub ext_dt: f64,
pub width: u32,
pub height: u32,
pub draw_width: u32,
pub draw_height: u32,
}
impl RenderArgs {
pub fn viewport(&self) -> Viewport {
Viewport {
rect: [0, 0, self.draw_width as i32, self.draw_height as i32],
window_size: [self.width, self.height],
draw_size: [self.draw_width, self.draw_height],
}
}
}
pub trait RenderEvent: Sized {
fn from_render_args(args: &RenderArgs, old_event: &Self) -> Option<Self>;
fn render<U, F>(&self, f: F) -> Option<U> where F: FnMut(&RenderArgs) -> U;
fn render_args(&self) -> Option<RenderArgs> {
self.render(|args| args.clone())
}
}
impl RenderEvent for Input {
fn from_render_args(args: &RenderArgs, _old_event: &Self) -> Option<Self> {
Some(Input::Render(*args))
}
fn render<U, F>(&self, mut f: F) -> Option<U>
where F: FnMut(&RenderArgs) -> U
{
match *self {
Input::Render(ref args) => Some(f(args)),
_ => None,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_input_render() {
use Input;
use RenderArgs;
let e = Input::Render(RenderArgs {
ext_dt: 0.0,
width: 0,
height: 0,
draw_width: 0,
draw_height: 0,
});
let x: Option<Input> = RenderEvent::from_render_args(&RenderArgs {
ext_dt: 1.0,
width: 10,
height: 10,
draw_width: 10,
draw_height: 10,
},
&e);
let y: Option<Input> = x.clone()
.unwrap()
.render(|args| RenderEvent::from_render_args(args, x.as_ref().unwrap()))
.unwrap();
assert_eq!(x, y);
}
}