toolbelt/
rect.rs

1//! A rectangle type with utility functions for manipulating and testing against geometry.
2
3use num::{Num, NumCast};
4
5#[derive(Default, Clone, Copy, Debug)]
6pub struct Rect<N: Num + NumCast + Copy + PartialOrd> {
7    pub x: N,
8    pub y: N,
9    pub w: N,
10    pub h: N,
11}
12
13#[inline]
14fn _cast<N: NumCast>(value: f32) -> N {
15    num::cast::<f32, N>(value).unwrap()
16}
17
18impl<N: Num + NumCast + Copy + PartialOrd> Rect<N> {
19    pub fn test(&self, pos_x: N, pos_y: N) -> bool {
20        pos_x >= self.x && pos_x <= self.x + self.w && pos_y >= self.y && pos_y <= self.y + self.h
21    }
22
23    pub fn adjusted_by(&self, dx: N, dy: N, dw: N, dh: N) -> Rect<N> {
24        Rect {
25            x: self.x + dx,
26            y: self.y + dy,
27            w: self.w + dw,
28            h: self.h + dh
29        }
30    }
31
32    pub fn retracted_by(&self, retract_x: N, retract_y: N) -> Rect<N> {
33        self.adjusted_by(retract_x, retract_y, retract_x * _cast(-2.0), retract_y * _cast(-2.0))
34    }
35
36    pub fn expanded_by(&self, expand_x: N, expand_y: N) -> Rect<N> {
37        self.adjusted_by(expand_x * _cast(-1.0), expand_x * _cast(-1.0), expand_y * _cast(2.0), expand_y * _cast(2.0))
38    }
39
40    pub fn position(&self) -> cgmath::Point2<N> {
41        cgmath::Point2::new(self.x, self.y)
42    }
43
44    pub fn size(&self) -> cgmath::Vector2<N> {
45        cgmath::Vector2::new(self.x, self.y)
46    }
47}
toolbelt/rect.rs

toolbelt/
rect.rs
