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Scale stroking line width when using a tiling pattern.

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This commit is contained in:
Brendan Dahl 2019-05-23 16:47:22 -07:00
parent 1421b2f205
commit 446efab707
4 changed files with 18 additions and 3 deletions
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14
src/display/canvas.js
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@ -1145,9 +1145,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
var ctx = this.ctx;
var strokeColor = this.current.strokeColor;
// Prevent drawing too thin lines by enforcing a minimum line width.
ctx.lineWidth = Math.max(this.getSinglePixelWidth() * MIN_WIDTH_FACTOR,
this.current.lineWidth);
// For stroke we want to temporarily change the global alpha to the
// stroking alpha.
ctx.globalAlpha = this.current.strokeAlpha;
@ -1156,10 +1153,21 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// for patterns, we transform to pattern space, calculate
// the pattern, call stroke, and restore to user space
ctx.save();
// The current transform will be replaced while building the pattern,
// but the line width needs to be adjusted by the current transform, so
// we must scale it. To properly fix this we should be using a pattern
// transform instead (see #10955).
let transform = ctx.mozCurrentTransform;
const scale = Util.singularValueDecompose2dScale(transform)[0];
ctx.strokeStyle = strokeColor.getPattern(ctx, this);
ctx.lineWidth = Math.max(this.getSinglePixelWidth() * MIN_WIDTH_FACTOR,
this.current.lineWidth * scale);
ctx.stroke();
ctx.restore();
} else {
// Prevent drawing too thin lines by enforcing a minimum line width.
ctx.lineWidth = Math.max(this.getSinglePixelWidth() * MIN_WIDTH_FACTOR,
this.current.lineWidth);
ctx.stroke();
}
if (consumePath) {