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
extern crate graphics;
extern crate input;
use std::collections::HashMap;
use input::{GenericEvent, Touch};
use graphics::{Context, Graphics};
pub type TouchValues = HashMap<(i64, i64), ([f64; 2], f64)>;
#[derive(Clone, Debug)]
pub struct TouchVisualizer {
pub touch_values: TouchValues,
window_size: Option<[u32; 2]>,
}
impl TouchVisualizer {
pub fn new() -> TouchVisualizer {
TouchVisualizer {
touch_values: HashMap::new(),
window_size: None,
}
}
pub fn draw<G: Graphics>(&self, c: &Context, g: &mut G) {
use graphics::ellipse::Ellipse;
let window_size = if let Some(size) = self.window_size {
size
} else {
return;
};
let color = [1.0, 0.0, 0.0, 0.4];
let radius = 20.0;
let mut draw = |pos: [f64; 2], pressure: f64| {
let r = radius * pressure;
let x = pos[0] * window_size[0] as f64 - r;
let y = pos[1] * window_size[1] as f64 - r;
let w = 2.0 * r;
Ellipse::new(color)
.resolution(16)
.draw([x, y, w, w], &c.draw_state, c.transform, g);
};
for &(pos, pressure) in self.touch_values.values() {
draw(pos, pressure);
}
}
pub fn event<E: GenericEvent, S: Into<[u32; 2]>>(&mut self, window_size: S, e: &E) {
self.window_size = Some(window_size.into());
if let Some(args) = e.touch_args() {
match args.touch {
Touch::Start | Touch::Move => {
self.touch_values
.insert((args.device, args.id), (args.position(), args.pressure()));
}
Touch::End | Touch::Cancel => {
self.touch_values.remove(&(args.device, args.id));
}
}
}
}
}