scratchfoundation/paper.js
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Further simplify getNearestPoint() algorithm.

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This commit is contained in:
Jürg Lehni 2013-05-07 00:07:18 -07:00
parent f34fe102a4
commit 7b8e27ddd9
2 changed files with 13 additions and 17 deletions
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29
src/path/Curve.js
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@ -910,46 +910,41 @@ statics: {
},
getNearestLocation: function(point) {
point = Point.read(arguments);
var values = this.getValues(),
precision = 1 / 100,
step = 1 / 100,
tolerance = Numerical.TOLERANCE,
minDist = Infinity,
minT = 0,
max = 1 + tolerance; // Accomodate imprecision
// First scan roughly for a close location
for (var t = 0; t <= max; t += precision) {
var pt = Curve.evaluate(values, t, true, 0),
dist = point.getDistance(pt, true);
if (dist < minDist) {
minDist = dist;
minT = t;
}
}
function closer(t) {
function refine(t) {
if (t >= 0 && t <= 1) {
var dist = point.getDistance(
Curve.evaluate(values, t, true, 0), true);
if (dist < minDist) {
minT = t;
minDist = dist;
minT = t;
return true;
}
}
}
for (var t = 0; t <= max; t += step)
refine(t);
// Now iteratively refine solution until we reach desired precision.
while (precision > tolerance) {
if (!closer(minT - precision) && !closer(minT + precision))
precision /= 2;
step /= 2;
while (step > tolerance) {
if (!refine(minT - step) && !refine(minT + step))
step /= 2;
}
var pt = Curve.evaluate(values, minT, true, 0);
return new CurveLocation(this, minT, pt, null, point.getDistance(pt));
},
getNearestPoint: function(point) {
return this.getNearestLocation(point).getPoint();
return this.getNearestLocation.apply(this, arguments).getPoint();
}
/**

1
src/path/Path.js
View file

@ -1539,6 +1539,7 @@ var Path = this.Path = PathItem.extend(/** @lends Path# */{
* the specified point
*/
getNearestLocation: function(point) {
point = this._matrix.inverseTransform(Point.read(arguments));
var curves = this.getCurves(),
minDist = Infinity,
minLoc = null;