scratchfoundation/paper.js
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Produce Path#getPointAt(), #getTangentAt(), #getNormalAt() & #getCurvature() in a loop, just like for Curve.

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This commit is contained in:
Jürg Lehni 2014-09-10 11:21:06 +02:00
parent 50c5c6736c
commit 73765e6654
1 changed files with 13 additions and 15 deletions
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28
src/path/Path.js
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@ -414,7 +414,7 @@ var Path = PathItem.extend(/** @lends Path# */{
for (var i = index + amount, l = segments.length; i < l; i++)
segments[i]._index = i;
}
// Keep the curves list in sync all the time in case it as requested
// Keep the curves list in sync all the time in case it was requested
// already.
if (curves || segs._curves) {
if (!curves)
@ -1596,7 +1596,14 @@ var Path = PathItem.extend(/** @lends Path# */{
// TODO: intersects(item)
// TODO: contains(item)
}, /** @lends Path# */{
}, Base.each(['getPoint', 'getTangent', 'getNormal', 'getCurvature'],
function(name, index) {
this[name + 'At'] = function(offset, isParameter) {
var loc = this.getLocationAt(offset, isParameter);
return loc && loc[name]();
};
},
/** @lends Path# */{
// Explicitly deactivate the creation of beans, as we have functions here
// that look like bean getters but actually read arguments.
// See #getLocationOf(), #getNearestLocation(), #getNearestPoint()
@ -1684,6 +1691,7 @@ var Path = PathItem.extend(/** @lends Path# */{
/**
* Calculates the point on the path at the given offset.
*
* @name Path#getPointAt
* @param {Number} offset the offset on the path, where {@code 0} is at
* the beginning of the path and {@link Path#length} at the end.
* @param {Boolean} [isParameter=false]
@ -1741,15 +1749,12 @@ var Path = PathItem.extend(/** @lends Path# */{
* });
* }
*/
getPointAt: function(offset, isParameter) {
var loc = this.getLocationAt(offset, isParameter);
return loc && loc.getPoint();
},
/**
* Calculates the tangent to the path at the given offset as a vector
* point.
*
* @name Path#getTangentAt
* @param {Number} offset the offset on the path, where {@code 0} is at
* the beginning of the path and {@link Path#length} at the end.
* @param {Boolean} [isParameter=false]
@ -1815,14 +1820,11 @@ var Path = PathItem.extend(/** @lends Path# */{
* })
* }
*/
getTangentAt: function(offset, isParameter) {
var loc = this.getLocationAt(offset, isParameter);
return loc && loc.getTangent();
},
/**
* Calculates the normal to the path at the given offset as a vector point.
*
* @name Path#getNormalAt
* @param {Number} offset the offset on the path, where {@code 0} is at
* the beginning of the path and {@link Path#length} at the end.
* @param {Boolean} [isParameter=false]
@ -1888,10 +1890,6 @@ var Path = PathItem.extend(/** @lends Path# */{
* });
* }
*/
getNormalAt: function(offset, isParameter) {
var loc = this.getLocationAt(offset, isParameter);
return loc && loc.getNormal();
},
/**
* Returns the nearest location on the path to the specified point.
@ -1951,7 +1949,7 @@ var Path = PathItem.extend(/** @lends Path# */{
getNearestPoint: function(/* point */) {
return this.getNearestLocation.apply(this, arguments).getPoint();
}
}, new function() { // Scope for drawing
}), new function() { // Scope for drawing
// Note that in the code below we're often accessing _x and _y on point
// objects that were read from segments. This is because the SegmentPoint