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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
use std::sync::Mutex;
use std::{cell::RefCell, rc::Rc};
use log::{Level, debug, info};
use wasm_bindgen::prelude::*;
use render_loop::RenderLoop;
use state::State;
use web_sys::Event;
mod line;
mod point;
mod render_loop;
mod state;
type JSResult<T> = Result<T, JsValue>;
type HandlerClosure = Closure<dyn FnMut(Event) -> JSResult<()>>;
fn window() -> web_sys::Window {
web_sys::window().expect("no window")
}
fn document() -> web_sys::Document {
window().document().expect("no document")
}
fn canvas() -> JSResult<web_sys::HtmlCanvasElement> {
let x = document()
.query_selector("section.watch canvas")?
.ok_or("no canvas")?;
Ok(x.dyn_into()?)
}
fn fps() -> JSResult<web_sys::HtmlElement> {
let x = document()
.query_selector("section.watch .fps")?
.ok_or("no fps counter")?;
Ok(x.dyn_into()?)
}
fn go() -> JSResult<web_sys::HtmlElement> {
let x = document()
.query_selector("section.watch button")?
.ok_or("no go button")?;
Ok(x.dyn_into()?)
}
fn iters() -> JSResult<web_sys::HtmlInputElement> {
let x = document()
.query_selector("section.bench input")?
.ok_or("no iters input")?;
Ok(x.dyn_into()?)
}
fn bench() -> JSResult<web_sys::HtmlElement> {
let x = document()
.query_selector("section.bench button")?
.ok_or("no bench button")?;
Ok(x.dyn_into()?)
}
fn results() -> JSResult<web_sys::HtmlElement> {
let x = document()
.query_selector("section.bench .results")?
.ok_or("no results element")?;
Ok(x.dyn_into()?)
}
fn dots() -> JSResult<web_sys::HtmlInputElement> {
let x = document()
.query_selector("#dots")?
.ok_or("no dots element")?;
Ok(x.dyn_into()?)
}
fn dots_val() -> JSResult<usize> {
Ok(dots()?.value().parse().map_err(|_| "dots isn't int")?)
}
#[wasm_bindgen(start)]
pub fn init() -> JSResult<()> {
console_log::init_with_level(Level::Debug)
.map_err(|e| format!("couldn't init console: {e}"))?;
info!("wasm init");
let paused = Rc::new(Mutex::new(true));
let p1 = paused.clone();
let mut s = State::new(canvas()?, fps()?)?;
s.set_dot_count(dots_val()?);
s.render_frame(0.0)?;
let shared_s = Rc::new(RefCell::new(s));
let s1 = shared_s.clone();
let s2 = shared_s.clone();
let render_loop = RenderLoop::new(move |t| {
let mut s = shared_s.borrow_mut();
s.update()?;
s.render_frame(t)?;
Ok(!*paused.lock().unwrap())
});
let dot_count_handler: HandlerClosure = Closure::new(move |e| {
debug!("dot count changed {:?} - {}", e, dots_val()?);
let mut s = s2.borrow_mut();
s.set_dot_count(dots_val()?);
s.render_frame(0.0)?;
Ok(())
});
dots()?.set_onchange(Some(dot_count_handler.as_ref().unchecked_ref()));
// otherwise it gets dropped after we're done, invalidating the
// handler.
dot_count_handler.forget();
let go_handler: HandlerClosure = Closure::new(move |e| {
debug!("go clicked: {:?}", e);
let mut p = p1.lock().unwrap();
*p = !*p;
let text = if *p {
"go"
} else {
render_loop.start()?;
"pause"
};
go()?.set_text_content(Some(text));
Ok(())
});
go()?.set_onclick(Some(go_handler.as_ref().unchecked_ref()));
// ibid.
go_handler.forget();
let bench_handler: HandlerClosure = Closure::new(move |e| {
debug!("bench clicked {:?}", e);
let iters = iters()?
.value()
.parse::<u32>()
.map_err(|_| "iters isn't int")?;
let mut s = s1.borrow_mut();
let perf = window().performance().unwrap();
let start = perf.now();
for _ in 0..iters {
s.points.sort_by(|a, b| {
if a.y > b.y {
std::cmp::Ordering::Greater
} else if a.y == b.y {
std::cmp::Ordering::Equal
} else {
std::cmp::Ordering::Less
}
});
s.find_poly();
s.update()?;
}
let end = perf.now();
let delta = end - start;
let iters_per_ms = Into::<f64>::into(iters) / delta;
results()?.set_text_content(Some(
format!(
"{} iters in {:0.2} ms ({:0.2} iters per ms)",
iters, delta, iters_per_ms
)
.as_str(),
));
Ok(())
});
bench()?.set_onclick(Some(bench_handler.as_ref().unchecked_ref()));
// ibid.
bench_handler.forget();
Ok(())
}
|
