56 lines
1.4 KiB
Rust
56 lines
1.4 KiB
Rust
use crate::html::Position;
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use crate::prelude::*;
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use gc_arena::Collect;
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/// Represents the transform for a DisplayObject.
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/// This includes both the transformation matrix and the color transform.
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///
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#[derive(Clone, Collect, Debug, Default)]
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#[collect(require_static)]
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pub struct Transform {
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pub matrix: Matrix,
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pub color_transform: ColorTransform,
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}
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impl From<Position<Twips>> for Transform {
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fn from(pos: Position<Twips>) -> Self {
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Self {
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matrix: Matrix::translate(pos.x(), pos.y()),
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color_transform: Default::default(),
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}
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}
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}
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pub struct TransformStack(Vec<Transform>);
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impl TransformStack {
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pub fn new() -> Self {
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Self(vec![Transform::default()])
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}
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pub fn push(&mut self, transform: &Transform) {
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let cur_transform = self.transform();
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let matrix = cur_transform.matrix * transform.matrix;
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let color_transform = cur_transform.color_transform * transform.color_transform;
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self.0.push(Transform {
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matrix,
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color_transform,
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});
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}
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pub fn pop(&mut self) {
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assert!(self.0.len() > 1, "Transform stack underflow");
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self.0.pop();
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}
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pub fn transform(&self) -> &Transform {
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&self.0[self.0.len() - 1]
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}
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}
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impl Default for TransformStack {
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fn default() -> Self {
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TransformStack::new()
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}
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}
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