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use crate::core::{Point, Rectangle, Size, Vector};
use glam::{Mat4, Vec3, Vec4};
use std::ops::Mul;
/// A 2D transformation matrix.
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Transformation(Mat4);
impl Transformation {
/// A [`Transformation`] that preserves whatever is transformed.
pub const IDENTITY: Self = Self(Mat4::IDENTITY);
/// Creates an orthographic projection.
#[rustfmt::skip]
pub fn orthographic(width: u32, height: u32) -> Transformation {
Transformation(Mat4::orthographic_rh_gl(
0.0, width as f32,
height as f32, 0.0,
-1.0, 1.0
))
}
/// Creates a translate transformation.
pub fn translate(x: f32, y: f32) -> Transformation {
Transformation(Mat4::from_translation(Vec3::new(x, y, 0.0)))
}
/// Creates a scale transformation.
pub fn scale(x: f32, y: f32) -> Transformation {
Transformation(Mat4::from_scale(Vec3::new(x, y, 1.0)))
}
/// The scale factor on the X axis.
pub fn scale_x(&self) -> f32 {
self.0.x_axis.x
}
/// The scale factor on the Y axis.
pub fn scale_y(&self) -> f32 {
self.0.y_axis.y
}
/// The translation on the X axis.
pub fn translation_x(&self) -> f32 {
self.0.w_axis.x
}
/// The translation on the Y axis.
pub fn translation_y(&self) -> f32 {
self.0.w_axis.y
}
}
impl Mul for Transformation {
type Output = Self;
fn mul(self, rhs: Self) -> Self {
Transformation(self.0 * rhs.0)
}
}
impl Mul<Transformation> for Point {
type Output = Self;
fn mul(self, transformation: Transformation) -> Self {
let point = transformation
.0
.mul_vec4(Vec4::new(self.x, self.y, 1.0, 1.0));
Point::new(point.x, point.y)
}
}
impl Mul<Transformation> for Vector {
type Output = Self;
fn mul(self, transformation: Transformation) -> Self {
let new_vector = transformation
.0
.mul_vec4(Vec4::new(self.x, self.y, 1.0, 0.0));
Vector::new(new_vector.x, new_vector.y)
}
}
impl Mul<Transformation> for Size {
type Output = Self;
fn mul(self, transformation: Transformation) -> Self {
let new_size = transformation.0.mul_vec4(Vec4::new(
self.width,
self.height,
1.0,
0.0,
));
Size::new(new_size.x, new_size.y)
}
}
impl Mul<Transformation> for Rectangle {
type Output = Self;
fn mul(self, transformation: Transformation) -> Self {
let position = self.position();
let size = self.size();
Self::new(position * transformation, size * transformation)
}
}
impl AsRef<[f32; 16]> for Transformation {
fn as_ref(&self) -> &[f32; 16] {
self.0.as_ref()
}
}
impl From<Transformation> for [f32; 16] {
fn from(t: Transformation) -> [f32; 16] {
*t.as_ref()
}
}
impl From<Transformation> for Mat4 {
fn from(transformation: Transformation) -> Self {
transformation.0
}
}
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