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Implement Curve#divide().

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Jürg Lehni 2012-12-30 19:49:17 +01:00
parent 4185b63d99
commit e066db4577
1 changed files with 59 additions and 1 deletions
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60
src/path/Curve.js
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@ -371,7 +371,65 @@ var Curve = this.Curve = Base.extend(/** @lends Curve# */{
return new Curve(this._segment2.reverse(), this._segment1.reverse());
},
// TODO: divide
/**
* Divides the curve into two at the specified position. The curve itself is
* modified and becomes the first part, the second part is returned as a new
* curve. If the modified curve belongs to a path item, the second part is
* added to it.
*
* @param parameter the position at which to split the curve as a value
* between 0 and 1 {@default 0.5}
* @return {Curve} the second part of the divided curve
*/
divide: function(parameter) {
var res = null;
// Accept CurveLocation objects, and objects that act like them:
if (parameter && parameter.curve === this)
parameter = parameter.parameter;
if (parameter > 0 && parameter < 1) {
var parts = Curve.subdivide(this.getValues(), parameter),
left = parts[0],
right = parts[1],
point1 = this._segment1._point,
point2 = this._segment2._point;
// Write back the results:
this._segment1._handleOut.set(left[2] - point1._x,
left[3] - point1._y);
// segment2 is the end segment. By inserting newSegment
// between segment1 and 2, 2 becomes the end segment.
// absolute->relative
this._segment2._handleIn.set(right[4] - point2._x,
right[5] - point2._y);
// Create the new segment, absolute -> relative:
var x = left[6], y = left[7],
segment = new Segment(Point.create(x, y),
Point.create(left[4] - x, left[5] - y),
Point.create(right[2] - x, right[3] - y));
// Insert it in the segments list, if needed:
if (this._path) {
// Insert at the end if this curve is a closing curve
// of a closed path, since otherwise it would be inserted
// at 0
if (this._segment1._index > 0 && this._segment2._index == 0) {
this._path.add(segment);
} else {
this._path.insert(this._segment2._index, segment);
}
res = this.getNext();
} else {
// otherwise create it from the result of split
var end = this._segment2;
this._segment2 = segment;
res = new Curve(segment, end);
}
}
return res;
},
// TODO: split
/**