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
use euclid::*;
#[derive(Clone, Debug)]
pub struct Region<Space> {
rects: Vec<Rect<f32, Space>>,
}
impl<Space> Region<Space> {
pub const EMPTY: Region<Space> = Region { rects: Vec::new() };
#[inline]
pub fn rects(&self) -> &[Rect<f32, Space>] {
&self.rects
}
pub fn add_rect(&mut self, rect: Rect<f32, Space>) {
if !rect.is_empty() {
self.rects.push(rect);
}
}
pub fn set_rect(&mut self, rect: Rect<f32, Space>) {
self.clear();
self.add_rect(rect);
}
pub fn clear(&mut self) {
self.rects.clear();
}
pub fn bounding_box(&self) -> Rect<f32, Space> {
if self.rects.is_empty() {
Rect::<f32, Space>::default()
} else {
self.rects[1..]
.iter()
.fold(self.rects[0], |r, s| r.union(s))
}
}
pub fn intersects(&self, rect: Rect<f32, Space>) -> bool {
self.rects.iter().any(|r| r.intersects(&rect))
}
pub fn is_empty(&self) -> bool {
self.rects.is_empty()
}
pub fn union_with(&mut self, other: &Region<Space>) {
self.rects.extend_from_slice(&other.rects);
}
}
impl<Space> std::ops::AddAssign<Vector2D<f32, Space>> for Region<Space> {
fn add_assign(&mut self, rhs: Vector2D<f32, Space>) {
for r in &mut self.rects {
*r = r.translate(rhs)
}
}
}
impl<Space> std::ops::SubAssign<Vector2D<f32, Space>> for Region<Space> {
fn sub_assign(&mut self, rhs: Vector2D<f32, Space>) {
for r in &mut self.rects {
*r = r.translate(-rhs)
}
}
}
impl<Space> From<Rect<f32, Space>> for Region<Space> {
fn from(rect: Rect<f32, Space>) -> Region<Space> {
Region { rects: vec![rect] }
}
}