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use crate::Point;
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Rect {
upper_left: [f32; 2],
lower_right: [f32; 2],
}
impl Rect {
pub fn new(x1: f32, y1: f32, x2: f32, y2: f32) -> Option<Rect> {
if appx_eq(x1, x2) || appx_eq(y1, y2) {
None
} else {
let upper_left = [min(x1, x2), min(y1, y2)];
let lower_right = [max(x1, x2), max(y1, y2)];
Some(Self {
upper_left,
lower_right,
})
}
}
pub const fn upper_left(&self) -> [f32; 2] {
self.upper_left
}
pub const fn lower_right(&self) -> [f32; 2] {
self.lower_right
}
}
impl From<[f32; 4]> for Rect {
fn from(arr: [f32; 4]) -> Rect {
match Rect::new(arr[0], arr[1], arr[2], arr[3]) {
Some(r) => r,
None => panic!("Tried to construct degenerate a2d Rect"),
}
}
}
impl From<[[f32; 2]; 2]> for Rect {
fn from(arr: [[f32; 2]; 2]) -> Rect {
[arr[0][0], arr[0][1], arr[1][0], arr[1][1]].into()
}
}
impl From<[Point; 2]> for Rect {
fn from(points: [Point; 2]) -> Self {
[points[0].to_array(), points[1].to_array()].into()
}
}
fn appx_eq(a: f32, b: f32) -> bool {
a == b || {
const EPSILON: f32 = f32::EPSILON * 128.0;
const RELTH: f32 = EPSILON;
let diff = (a - b).abs();
let norm = min(a.abs() + b.abs(), f32::MAX);
diff < max(RELTH, EPSILON * norm)
}
}
fn min(a: f32, b: f32) -> f32 {
if a < b {
a
} else {
b
}
}
fn max(a: f32, b: f32) -> f32 {
if a > b {
a
} else {
b
}
}