1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
use std::cell::RefCell;
use std::sync::{Mutex};
use std::rc::Rc;
use log::{Level, info, debug};
use wasm_bindgen::prelude::*;
use state::State;
mod line;
mod point;
mod state;
struct RenderLoop {
animation_id: Option<i32>,
pub closure: Option<Closure<dyn FnMut(f64)>>,
}
impl RenderLoop {
pub fn new() -> Self {
Self {
animation_id: None,
closure: None,
}
}
}
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)?;
//
// from https://users.rust-lang.org/t/wasm-web-sys-how-to-use-window-request-animation-frame-resolved/20882
//
let render_loop: Rc<RefCell<RenderLoop>> = Rc::new(RefCell::new(RenderLoop::new()));
{
let closure: Closure<dyn FnMut(f64)> = {
let render_loop_clone = render_loop.clone();
Closure::wrap(Box::new(move |t| {
s.render_frame(t).expect("should render frame");
let p = paused.lock().unwrap();
if !*p {
let mut render_loop_mut = render_loop_clone.borrow_mut();
render_loop_mut.animation_id = if let Some(ref closure) = render_loop_mut.closure {
Some(
window()
.request_animation_frame(closure.as_ref().unchecked_ref())
.expect("req anim frame"),
)
} else {
None
}
}
}))
};
let mut render_loop_last = render_loop.borrow_mut();
render_loop_last.animation_id = Some(
window()
.request_animation_frame(closure.as_ref().unchecked_ref())
.expect("req anim frame"),
);
render_loop_last.closure = Some(closure);
}
//
//
//
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 {
let render_loop_clone = render_loop.clone();
let mut render_loop_mut = render_loop_clone.borrow_mut();
render_loop_mut.animation_id = if let Some(ref closure) = render_loop_mut.closure {
Some(
window()
.request_animation_frame(closure.as_ref().unchecked_ref())
.expect("req anim frame"),
)
} else {
None
};
"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(())
}
|
