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fix winding

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bendn 2023-11-02 06:15:51 +07:00
parent 0c490c0005
commit 997da104d2
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GPG key ID: 0D9D3A2A3B2A93D6
1 changed files with 14 additions and 3 deletions
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17
src/drawing/tri.rs
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@ -21,14 +21,25 @@ impl<T: AsMut<[u8]> + AsRef<[u8]>, const CHANNELS: usize> Image<T, CHANNELS> {
/// ```
pub fn tri<F: Float<f32>>(
&mut self,
b: impl Into<Vector2<F>>,
a: impl Into<Vector2<F>>,
b: impl Into<Vector2<F>>,
c: impl Into<Vector2<F>>,
col: [u8; CHANNELS],
) {
let Vector2 { x: x1, y: y1 } = a.into();
let Vector2 { x: x2, y: y2 } = b.into();
let Vector2 {
x: mut x1,
y: mut y1,
} = a.into();
let Vector2 {
x: mut x2,
y: mut y2,
} = b.into();
let Vector2 { x: x3, y: y3 } = c.into();
// fix winding
if (x2 - x1) * (y3 - y1) - (y2 - y1) * (x3 - x1) > 0.0 {
std::mem::swap(&mut x1, &mut x2);
std::mem::swap(&mut y1, &mut y2);
}
let ymin = max(y1.min(y2).min(y3).take() as u32, 0);
let ymax = min(y1.max(y2).max(y3).take() as u32, self.height());
let xmin = max(x1.min(x2).min(x3).take() as u32, 0);