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Fixed problem when rotation is applied

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This commit is contained in:
k1w1 2022-07-17 09:55:39 -07:00
parent c64d8283d4
commit 6e7449a639
2 changed files with 30 additions and 9 deletions
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32
context.js
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@ -1038,12 +1038,13 @@ export default (function () {
return;
}
x = this.__matrixTransform(x, y).x;
y = this.__matrixTransform(x, y).y;
var scaleX = Math.hypot(this.__transformMatrix.a, this.__transformMatrix.b);
var scaleY = Math.hypot(this.__transformMatrix.c, this.__transformMatrix.d);
radiusX = radiusX * scaleX;
radiusY = radiusY * scaleY;
var transformedCenter = this.__matrixTransform(x, y);
x = transformedCenter.x;
y = transformedCenter.y;
var scale = this.__getTransformScale();
radiusX = radiusX * scale.x;
radiusY = radiusY * scale.y;
rotation = rotation + this.__getTransformRotation()
startAngle = startAngle % (2*Math.PI);
endAngle = endAngle % (2*Math.PI);
@ -1338,6 +1339,25 @@ export default (function () {
return new DOMPoint(x, y).matrixTransform(this.__transformMatrix)
}
/**
*
* @returns The scale component of the transform matrix as {x,y}.
*/
Context.prototype.__getTransformScale = function() {
return {
x: Math.hypot(this.__transformMatrix.a, this.__transformMatrix.b),
y: Math.hypot(this.__transformMatrix.c, this.__transformMatrix.d)
};
}
/**
*
* @returns The rotation component of the transform matrix in radians.
*/
Context.prototype.__getTransformRotation = function() {
return Math.atan2(this.__transformMatrix.b, this.__transformMatrix.a);
}
/**
*
* @param {*} sx The x-axis coordinate of the top-left corner of the rectangle from which the ImageData will be extracted.

7
test/tests/ellipse2.js
View File

@ -2,10 +2,11 @@
export default function ellipse2(ctx) {
// Draw a cylinder using ellipses and lines.
var w = 100, h = 100, rx = 50, ry = 10;
var scaleX = 1.5, scaleY = 2.5;
var scaleX = 1.5, scaleY = 1.2;
ctx.rotate(Math.PI / 10);
ctx.scale(scaleX, scaleY);
ctx.translate(100, 75);
ctx.translate(200, 25);
ctx.beginPath();
ctx.moveTo(-w / 2, -h / 2 + ry);
@ -27,6 +28,6 @@ export default function ellipse2(ctx) {
// Remove scale before stroking because the SVG conversion is not correctly
// scaling the stroke as well. Without this the pixel differences are too
// high.
ctx.scale(1 / scaleX, 1 / scaleY);
ctx.resetTransform();
ctx.stroke();
};