game_toolkit_platformer/sim/
rect.rs

1//! [`Rect`]: an integer axis-aligned box, in units or in a terrain's pixels.
2
3/// An axis-aligned box: top-left `x, y`, size `w` x `h`. Units inside the movement, a
4/// terrain's pixels at the facade with a `Builder::scale` (see `docs/scale.md`).
5#[derive(Clone, Copy, Debug, PartialEq, Eq)]
6pub struct Rect {
7    /// Left edge.
8    pub x: i32,
9    /// Top edge.
10    pub y: i32,
11    /// Width.
12    pub w: i32,
13    /// Height.
14    pub h: i32,
15}
16
17impl Rect {
18    /// The box moved by `dx, dy`.
19    pub fn shifted(self, dx: i32, dy: i32) -> Self {
20        Self {
21            x: self.x + dx,
22            y: self.y + dy,
23            ..self
24        }
25    }
26
27    /// The box `k` times as large, from the origin: units to pixels at `k` pixels per
28    /// unit.
29    pub fn scaled(self, k: i32) -> Self {
30        Self {
31            x: self.x * k,
32            y: self.y * k,
33            w: self.w * k,
34            h: self.h * k,
35        }
36    }
37
38    /// One past the right edge.
39    pub fn right(self) -> i32 {
40        self.x + self.w
41    }
42
43    /// One past the bottom edge.
44    pub fn bottom(self) -> i32 {
45        self.y + self.h
46    }
47
48    /// Whether the two boxes overlap (share any unit square).
49    pub fn intersects(self, o: Rect) -> bool {
50        self.x < o.right() && o.x < self.right() && self.y < o.bottom() && o.y < self.bottom()
51    }
52}
game_toolkit_platformer/sim/rect.rs

game_toolkit_platformer/sim/
rect.rs
