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
|
/// An axis-aligned rectangle in screen space, used for window and monitor bounds.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct Rect {
pub x: i32,
pub y: i32,
pub width: u32,
pub height: u32,
}
impl Rect {
pub fn new(x: i32, y: i32, width: u32, height: u32) -> Self {
Self { x, y, width, height }
}
pub fn right(&self) -> i32 {
self.x + self.width as i32
}
pub fn bottom(&self) -> i32 {
self.y + self.height as i32
}
pub fn contains_point(&self, x: i32, y: i32) -> bool {
x >= self.x && x < self.right() && y >= self.y && y < self.bottom()
}
pub fn overlaps(&self, other: &Rect) -> bool {
!(self.right() <= other.x
|| other.right() <= self.x
|| self.bottom() <= other.y
|| other.bottom() <= self.y)
}
/// Shrinks the rect on all sides by `margin`, saturating at zero size.
pub fn inset(&self, margin: u32) -> Rect {
let m = margin as i32;
let width = self.width.saturating_sub(margin * 2);
let height = self.height.saturating_sub(margin * 2);
Rect { x: self.x + m, y: self.y + m, width, height }
}
pub fn center(&self) -> (i32, i32) {
(self.x + self.width as i32 / 2, self.y + self.height as i32 / 2)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn overlap_detection_matches_aabb_semantics() {
let a = Rect::new(0, 0, 100, 100);
let b = Rect::new(50, 50, 100, 100);
let c = Rect::new(100, 100, 50, 50); // touches corner, should not overlap (half-open)
let d = Rect::new(200, 200, 10, 10);
assert!(a.overlaps(&b));
assert!(!a.overlaps(&c));
assert!(!a.overlaps(&d));
}
#[test]
fn inset_shrinks_symmetrically() {
let r = Rect::new(0, 0, 100, 60);
let inset = r.inset(10);
assert_eq!(inset, Rect::new(10, 10, 80, 40));
}
#[test]
fn contains_point_is_half_open() {
let r = Rect::new(0, 0, 10, 10);
assert!(r.contains_point(0, 0));
assert!(!r.contains_point(10, 10));
assert!(r.contains_point(9, 9));
}
}
|