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Improve CurveLocation#equals().

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This commit is contained in:
Jürg Lehni 2015-10-21 01:15:46 +02:00
parent 1f476c2107
commit eb62530958
1 changed files with 16 additions and 14 deletions
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30
src/path/CurveLocation.js
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@ -301,31 +301,33 @@ var CurveLocation = Base.extend(/** @lends CurveLocation# */{
* @return {Boolean} {@true if the locations are equal}
*/
equals: function(loc, _ignoreOther) {
var res = this === loc;
var res = this === loc,
epsilon = /*#=*/Numerical.GEOMETRIC_EPSILON;
// NOTE: We need to compare both by (index + parameter) and by proximity
// of points. See:
// https://github.com/paperjs/paper.js/issues/784#issuecomment-143161586
if (!res && loc instanceof CurveLocation
&& this.getPath() === loc.getPath()) {
// NOTE: We need to compare both by (index + parameter) and by
// proximity of points, see:
// https://github.com/paperjs/paper.js/issues/784#issuecomment-143161586
// We need to wrap the diff value around the path's beginning / end.
&& this.getPath() === loc.getPath()
&& this.getPoint().isClose(loc.getPoint(), epsilon)) {
// The position is the same, but it could still be in a different
// location on the path. Perform more thorough checks now:
var c1 = this.getCurve(),
c2 = loc.getCurve(),
abs = Math.abs,
// We need to wrap diff around the path's beginning / end:
diff = abs(
((c1.isLast() && c2.isFirst() ? -1 : c1.getIndex())
+ this.getParameter()) -
((c2.isLast() && c1.isFirst() ? -1 : c2.getIndex())
+ loc.getParameter())),
eps = /*#=*/Numerical.GEOMETRIC_EPSILON;
+ loc.getParameter()));
res = (diff < /*#=*/Numerical.CURVETIME_EPSILON
// When the location is close enough, compare the offsets of
// If diff isn't close enough, compare the actual offsets of
// both locations to determine if they're in the same spot,
// taking into account the wrapping around path ends too.
|| this.getPoint().isClose(loc.getPoint(), eps)
// Use GEOMETRIC_EPSILON * 2 when comparing offsets, to
// slightly increase tolerance when in the same spot.
&& ((diff = abs(this.getOffset() - loc.getOffset())) < eps * 2
|| abs(this.getPath().getLength() - diff) < eps * 2))
// This is necessary in order to handle very short consecutive
// curves (length ~< 1e-7), which would lead to diff > 1.
|| ((diff = abs(this.getOffset() - loc.getOffset())) < epsilon
|| abs(this.getPath().getLength() - diff) < epsilon))
&& (_ignoreOther
|| (!this._intersection && !loc._intersection
|| this._intersection && this._intersection.equals(