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Improve Path._addSquareCap() for use in path offsetting code.

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Jürg Lehni 2017-03-08 13:41:23 +01:00
parent 6bc24c42c9
commit 155d5b879c
1 changed files with 8 additions and 7 deletions
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15
src/path/Path.js
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@ -1721,7 +1721,7 @@ var Path = PathItem.extend(/** @lends Path# */{
} }
function checkSegmentStroke(segment) { function checkSegmentStroke(segment) {
// Handle joins / caps that are not round specificelly, by // Handle joins / caps that are not round specifically, by
// hit-testing their polygon areas. // hit-testing their polygon areas.
var isJoin = closed || segment._index > 0 var isJoin = closed || segment._index > 0
&& segment._index < numSegments - 1; && segment._index < numSegments - 1;
@ -2834,19 +2834,20 @@ statics: {
// Style#strokeScaling. // Style#strokeScaling.
var point = segment._point.transform(matrix), var point = segment._point.transform(matrix),
loc = segment.getLocation(), loc = segment.getLocation(),
normal = loc.getNormal().multiply(radius).transform(strokeMatrix); // Checking loc.getTime() for 0 is to see whether this is the first
// or the last segment of the open path, in order to determine in
// which direction to flip the normal.
normal = loc.getNormal()
.multiply(loc.getTime() === 0 ? radius : -radius)
.transform(strokeMatrix);
// For square caps, we need to step away from point in the direction of // For square caps, we need to step away from point in the direction of
// the tangent, which is the rotated normal. // the tangent, which is the rotated normal.
// Checking loc.getTime() for 0 is to see whether this is the first
// or the last segment of the open path, in order to determine in which
// direction to move the point.
if (cap === 'square') { if (cap === 'square') {
if (isArea) { if (isArea) {
addPoint(point.subtract(normal)); addPoint(point.subtract(normal));
addPoint(point.add(normal)); addPoint(point.add(normal));
} }
point = point.add(normal.rotate( point = point.add(normal.rotate(-90));
loc.getTime() === 0 ? -90 : 90));
} }
addPoint(point.add(normal)); addPoint(point.add(normal));
addPoint(point.subtract(normal)); addPoint(point.subtract(normal));