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Add experimental orientation detection for Paths.

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This commit is contained in:
Jürg Lehni 2011-05-15 11:33:09 +01:00
parent 06f16d0c2a
commit 51dbd85db5
1 changed files with 25 additions and 0 deletions
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25
src/path/Path.js
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@ -356,6 +356,31 @@ var Path = this.Path = PathItem.extend({
return false;
},
getOrientation: function() {
var sum = 0;
var xPre, yPre;
function edge(x, y) {
if (xPre !== undefined) {
sum += (xPre - x) * (y + yPre);
}
xPre = x;
yPre = y;
}
for (var i = 0, l = this._segments.length; i < l; i++) {
var seg1 = this._segments[i];
var seg2 = this._segments[i + 1 < l ? i + 1 : 0];
var point1 = seg1._point;
var handle1 = seg1._handleOut;
var handle2 = seg2._handleIn;
var point2 = seg2._point;
edge(point1._x, point1._y);
edge(point1._x + handle1._x, point1._y + handle1._y);
edge(point2._x + handle2._x, point2._y + handle2._y);
edge(point2._x, point2._y);
}
return sum;
},
getLength: function() {
if (this._length == null) {
var curves = this.getCurves();