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