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use std::rc::Rc;
use std::sync::Mutex;
use log::{Level, debug, info};
use wasm_bindgen::prelude::*;
use state::State;
use render_loop::RenderLoop;
mod line;
mod point;
mod render_loop;
mod state;
fn window() -> web_sys::Window {
web_sys::window().expect("no window")
}
fn document() -> web_sys::Document {
window().document().expect("no document")
}
fn canvas() -> Result<web_sys::HtmlCanvasElement, JsValue> {
let x = document()
.query_selector("canvas")?
.expect("canvas element");
Ok(x.dyn_into::<web_sys::HtmlCanvasElement>()?)
}
fn fps() -> Result<web_sys::HtmlElement, JsValue> {
let x = document()
.query_selector("#fps")?
.expect("fps counter exists");
Ok(x.dyn_into::<web_sys::HtmlElement>()?)
}
fn go() -> Result<web_sys::HtmlElement, JsValue> {
let x = document()
.query_selector("button")?
.expect("go button exists");
Ok(x.dyn_into::<web_sys::HtmlElement>()?)
}
#[wasm_bindgen(start)]
pub fn init() -> Result<(), JsValue> {
console_log::init_with_level(Level::Debug).expect("couldn't init console log");
info!("wasm init");
let paused = Rc::new(Mutex::new(true));
let p1 = paused.clone();
let mut s = State::new(canvas()?, fps()?)?;
s.render_frame(0.0)?;
let render_loop = RenderLoop::new(move |t| {
s.render_frame(t).expect("should render frame");
!*paused.lock().unwrap()
});
let a = Closure::<dyn FnMut()>::new(move || {
let mut p = p1.lock().unwrap();
debug!("go clicked: {}", *p);
*p = !*p;
let text = if *p {
"go"
} else {
render_loop.start().expect("start render loop");
"pause"
};
go().expect("go button works").set_text_content(Some(text));
});
go()?.set_onclick(Some(a.as_ref().unchecked_ref()));
// otherwise it gets dropped after we're done, invalidating the
// handler.
a.forget();
Ok(())
}
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