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Canvas: implement transformation matrix rotation.

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This commit is contained in:
Mátyás Mustoha 2015-05-05 13:03:34 +02:00
parent 7b87085c18
commit e3e2119c4c
10 changed files with 15 additions and 45 deletions
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14
components/script/dom/canvasrenderingcontext2d.rs
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@ -355,6 +355,20 @@ impl<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D>
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-rotate
fn Rotate(self, angle: f64) {
if angle == 0.0 || !angle.is_finite() {
return;
}
let (sin, cos) = (angle.sin(), angle.cos());
let transform = self.state.borrow().transform;
self.state.borrow_mut().transform = transform.mul(&Matrix2D::new(cos as f32, sin as f32,
-sin as f32, cos as f32,
0.0, 0.0));
self.update_transform()
}
// https://html.spec.whatwg.org/multipage/#dom-context-2d-translate
fn Translate(self, x: f64, y: f64) {
if !(x.is_finite() && y.is_finite()) {

2
components/script/dom/webidls/CanvasRenderingContext2D.webidl
View file

@ -32,7 +32,7 @@ interface CanvasRenderingContext2D {
// transformations (default transform is the identity matrix)
// attribute SVGMatrix currentTransform;
void scale(unrestricted double x, unrestricted double y);
//void rotate(unrestricted double angle);
void rotate(unrestricted double angle);
void translate(unrestricted double x, unrestricted double y);
void transform(unrestricted double a,
unrestricted double b,