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Fix zero width lines.

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This commit is contained in:
Brendan Dahl 2012-01-17 20:50:49 -08:00
parent 782b67b967
commit 8aac2256ed
4 changed files with 25 additions and 2 deletions
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19
src/canvas.js
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@ -48,6 +48,7 @@ var CanvasExtraState = (function CanvasExtraStateClosure() {
// Note: fill alpha applies to all non-stroking operations
this.fillAlpha = 1;
this.strokeAlpha = 1;
this.lineWidth = 1;
this.old = old;
}
@ -329,6 +330,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// Graphics state
setLineWidth: function canvasGraphicsSetLineWidth(width) {
this.current.lineWidth = width;
this.ctx.lineWidth = width;
},
setLineCap: function canvasGraphicsSetLineCap(style) {
@ -442,6 +444,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
consumePath = typeof consumePath !== 'undefined' ? consumePath : true;
var ctx = this.ctx;
var strokeColor = this.current.strokeColor;
if (this.current.lineWidth === 0)
ctx.lineWidth = this.getSinglePixelWidth();
// For stroke we want to temporarily change the global alpha to the
// stroking alpha.
ctx.globalAlpha = this.current.strokeAlpha;
@ -640,7 +644,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
ctx.translate(current.x, current.y);
ctx.scale(textHScale, 1);
ctx.lineWidth /= current.textMatrix[0];
if (textSelection) {
this.save();
@ -677,7 +680,15 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
} else {
ctx.save();
this.applyTextTransforms();
ctx.lineWidth /= current.textMatrix[0] * fontMatrix[0];
var lineWidth = current.lineWidth;
var scale = Math.abs(current.textMatrix[0] * fontMatrix[0]);
if (scale == 0 || lineWidth == 0)
lineWidth = this.getSinglePixelWidth();
else
lineWidth /= scale;
ctx.lineWidth = lineWidth;
if (textSelection)
text.geom = this.getTextGeometry();
@ -1142,6 +1153,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
},
restoreFillRule: function canvasGraphicsRestoreFillRule(rule) {
this.ctx.mozFillRule = rule;
},
getSinglePixelWidth: function getSinglePixelWidth(scale) {
var inverse = this.ctx.mozCurrentTransformInverse;
return Math.abs(inverse[0] + inverse[2]);
}
};