Projective Transformations

```rust use projective::Projective;

[derive(Debug, Copy, Clone, PartialEq)]

pub struct Point(f64, f64);

impl Projective 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 testtransform() { let p0 = Point(1.0, 2.0); asserteq!(p0.translate(2.0, 1.0), Point(3.0, 3.0)); asserteq!(p0.scale(2.0, 3.0), Point(2.0, 6.0)); // floating precision error, implement rotate manually to reduce errors asserteq!(p0.rotate(std::f64::consts::PI), Point(-0.9999999999999998, -2.0)); } ```