scratchfoundation/paper.js
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Clean up code a bit and add comment about possible further optimsiations.

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This commit is contained in:
Jürg Lehni 2011-05-06 00:44:54 +01:00
parent a3065a59d1
commit 680ae49ec8
1 changed files with 10 additions and 9 deletions
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19
src/path/Path.js
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@ -801,8 +801,8 @@ var Path = this.Path = PathItem.extend({
centerY = -d / 2,
radius = Math.sqrt(centerX * centerX + centerY * centerY - e),
// Note: reversing the Y equations negates the angle to adjust
// for the upside down coordinate system.
// Note: reversing the Y equations negates the angle to adjust
// for the upside down coordinate system.
angle = Math.atan2(centerY - y1, x1 - centerX),
middle = Math.atan2(centerY - y2, x2 - centerX),
extent = Math.atan2(centerY - y3, x3 - centerX),
@ -836,19 +836,20 @@ var Path = this.Path = PathItem.extend({
z = 4 / 3 * Math.sin(halfInc) / (1 + Math.cos(halfInc));
var segments = [];
// TODO: Use Point#setAngle() and Point vector algebra instead.
for (var i = 0; i <= arcSegs; i++) {
var relx = Math.cos(angle),
rely = Math.sin(angle),
pt = new Point(
centerX + relx * radius,
centerY + rely * radius
);
var out = i == arcSegs
? null
: new Point(
centerX + (relx - z * rely) * radius - pt.x,
centerY + (rely + z * relx) * radius - pt.y
);
),
out = i == arcSegs
? null
: new Point(
centerX + (relx - z * rely) * radius - pt.x,
centerY + (rely + z * relx) * radius - pt.y
);
if (i == 0) {
// Modify startSegment
current.setHandleOut(out);