scratchfoundation/paper.js
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Add support for all strokeCaps in getStrokeBounds, joins are still pending.

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This commit is contained in:
Jürg Lehni 2011-03-06 13:11:25 +00:00
parent 15f124bd9c
commit de9a406dc0
1 changed files with 15 additions and 8 deletions
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23
src/path/Path.js
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@ -568,18 +568,25 @@ var Path = this.Path = PathItem.extend({
bounds = bounds.unite(joinBounds);
}
function addCap(segment, cap) {
var capBounds;
function addCap(segment, cap, t) {
switch (cap) {
case 'round':
return addJoin(segment, cap);
case 'square':
break;
case 'butt':
case 'square':
// Calculate the corner points of butt and square caps
var point = segment._point,
curve = segment.getCurve(),
normal = curve.getNormal(t).normalize(radius);
// For square caps, we need to step away from point in the
// direction of the tangent, which is the rotated normal
if (cap == 'square') {
point = point.add(-normal.y, normal.x);
}
bounds = bounds.include(point.add(normal));
bounds = bounds.include(point.subtract(normal));
break;
}
if (capBounds)
bounds = bounds.unite(capBounds);
}
for (var i = 1, l = length - (closed ? 0 : 1); i < l; i++) {
@ -588,8 +595,8 @@ var Path = this.Path = PathItem.extend({
if (closed) {
addJoin(segments[0], join);
} else {
addCap(segments[0], cap);
addCap(segments[length - 1], cap);
addCap(segments[0], cap, 0);
addCap(segments[length - 1], cap, 1);
}
return bounds;