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
use types::{ FontSize, Scalar };
use ImageSize;
#[derive(Clone)]
pub struct Character<'a, T: 'a + ImageSize> {
pub offset: [Scalar; 2],
pub size: [Scalar; 2],
pub texture: &'a T,
}
impl<'a, T: ImageSize> Character<'a, T> {
pub fn left(&self) -> Scalar {
self.offset[0]
}
pub fn top(&self) -> Scalar {
self.offset[1]
}
pub fn width(&self) -> Scalar {
self.size[0]
}
pub fn height(&self) -> Scalar {
self.size[1]
}
}
pub trait CharacterCache {
type Texture: ImageSize;
fn character<'a>(
&'a mut self,
font_size: FontSize,
ch: char
) -> Character<'a, <Self as CharacterCache>::Texture>;
fn width(&mut self, size: FontSize, text: &str) -> ::math::Scalar {
text.chars().fold(0.0, |a, ch| {
let character = self.character(size, ch);
a + character.width()
})
}
}