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Handle stationary points in #getWinding method.

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This commit is contained in:
hkrish 2014-02-22 18:56:19 +01:00
parent b4d8315484
commit 49ddfafe4d
2 changed files with 13 additions and 6 deletions
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17
src/path/PathItem.Boolean.js
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@ -251,7 +251,7 @@ PathItem.inject(new function() {
* Private method that returns the winding contribution of the given point
* with respect to a given set of monotone curves.
*/
function getWinding(point, curves, horizontal) {
function getWinding(point, curves, horizontal, testContains) {
var TOLERANCE = /*#=*/ Numerical.TOLERANCE,
x = point.x,
y = point.y,
@ -318,7 +318,10 @@ PathItem.inject(new function() {
if (abs(slope) < TOLERANCE && !Curve.isLinear(values)
|| t < TOLERANCE && slope * Curve.evaluate(
curve.previous.values, t, 1).y < 0) {
// TODO: Handle stationary points here!
if (testContains && x0 >= xBefore && x0 <= xAfter) {
++windLeft;
++windRight;
}
} else if (x0 <= xBefore) {
windLeft += curve.winding;
} else if (x0 >= xAfter) {
@ -448,12 +451,16 @@ PathItem.inject(new function() {
*
* @param {Point} point the location for which to determine the winding
* direction
* @param {Boolean} horizontal wether we need to consider this point as
* @param {Boolean} horizontal whether we need to consider this point as
* part of a horizontal curve
* @param {Boolean} testContains whether we need to consider this point
* as part of stationary points on the curve itself, used when checking
* the winding about a point.
* @return {Number} the winding number
*/
_getWinding: function(point, horizontal) {
return getWinding(point, this._getMonoCurves(), horizontal);
_getWinding: function(point, horizontal, testContains) {
return getWinding(point, this._getMonoCurves(),
horizontal, testContains);
},
/**

2
src/path/PathItem.js
View file

@ -296,7 +296,7 @@ var PathItem = Item.extend(/** @lends PathItem# */{
CanvasProvider.release(ctx);
return res;
/*#*/ } else { // !__options.nativeContains && __options.booleanOperations
var winding = this._getWinding(point);
var winding = this._getWinding(point, false, true);
return !!(this.getWindingRule() === 'evenodd' ? winding & 1 : winding);
/*#*/ } // !__options.nativeContains && __options.booleanOperations
},