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use nalgebra::Matrix3;
use std::ops::Mul;
/// A 2D transformation matrix.
///
/// It can be used to apply a transformation to a [`Target`].
///
/// [`Target`]: struct.Target.html
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Transformation(Matrix3<f32>);
impl Transformation {
/// Get the identity transformation.
pub fn identity() -> Transformation {
Transformation(Matrix3::identity())
}
/// Creates an orthographic projection.
///
/// You should rarely need this. On creation, a [`Target`] is automatically
/// set up with the correct orthographic projection.
///
/// [`Target`]: struct.Target.html
#[rustfmt::skip]
pub fn orthographic(width: u16, height: u16) -> Transformation {
Transformation(nalgebra::Matrix3::new(
2.0 / f32::from(width), 0.0, -1.0,
0.0, 2.0 / f32::from(height), -1.0,
0.0, 0.0, 1.0
))
}
/// Creates a translate transformation.
///
/// You can use this to pan your camera, for example.
pub fn translate(x: f32, y: f32) -> Transformation {
Transformation(Matrix3::new_translation(&nalgebra::Vector2::new(x, y)))
}
}
impl Mul for Transformation {
type Output = Self;
fn mul(self, rhs: Self) -> Self {
Transformation(self.0 * rhs.0)
}
}
impl From<Transformation> for [f32; 16] {
#[rustfmt::skip]
fn from(t: Transformation) -> [f32; 16] {
[
t.0[0], t.0[1], 0.0, t.0[2],
t.0[3], t.0[4], 0.0, t.0[5],
0.0, 0.0, -1.0, 0.0,
t.0[6], t.0[7], 0.0, t.0[8]
]
}
}
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