2 releases
0.0.1 | Apr 17, 2023 |
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0.0.0 | Apr 17, 2023 |
#5 in #projective
30 downloads per month
88KB
2.5K
SLoC
Projective Transformations
use projective::Projective;
#[derive(Debug, Copy, Clone, PartialEq)]
pub struct Point(f64, f64);
impl Projective<f64> for Point {
fn transform(self, matrix: &[f64; 9]) -> Self {
Point(
matrix[2] + matrix[0] * self.0 + matrix[1] * self.1,
matrix[5] + matrix[3] * self.0 + matrix[4] * self.1
)
}
}
#[test]
fn test_transform() {
let p0 = Point(1.0, 2.0);
assert_eq!(p0.translate(2.0, 1.0), Point(3.0, 3.0));
assert_eq!(p0.scale(2.0, 3.0), Point(2.0, 6.0));
// floating precision error, implement rotate manually to reduce errors
assert_eq!(p0.rotate(std::f64::consts::PI), Point(-0.9999999999999998, -2.0));
}
Dependencies
~670KB
~12K SLoC