Add ellipse rotation (optional) to THREE.Path.

Adds an optional rotation parameter to THREE.Path.ellipse and THREE.Path.absellipse.

src/extras/core/Path.js

@@ -153,24 +153,24 @@ THREE.Path.prototype.arc = function ( aX, aY, aRadius,
  };
 
 THREE.Path.prototype.ellipse = function ( aX, aY, xRadius, yRadius,
-									  aStartAngle, aEndAngle, aClockwise ) {
+									  aStartAngle, aEndAngle, aClockwise, aRotation ) {
 
 	var lastargs = this.actions[ this.actions.length - 1 ].args;
 	var x0 = lastargs[ lastargs.length - 2 ];
 	var y0 = lastargs[ lastargs.length - 1 ];
 
 	this.absellipse( aX + x0, aY + y0, xRadius, yRadius,
-		aStartAngle, aEndAngle, aClockwise );
+		aStartAngle, aEndAngle, aClockwise, aRotation );
 
  };
 
 
 THREE.Path.prototype.absellipse = function ( aX, aY, xRadius, yRadius,
-									  aStartAngle, aEndAngle, aClockwise ) {
+									  aStartAngle, aEndAngle, aClockwise, aRotation ) {
 
 	var args = Array.prototype.slice.call( arguments );
 	var curve = new THREE.EllipseCurve( aX, aY, xRadius, yRadius,
-									aStartAngle, aEndAngle, aClockwise );
+									aStartAngle, aEndAngle, aClockwise, aRotation );
 	this.curves.push( curve );
 
 	var lastPoint = curve.getPoint( 1 );
@@ -386,13 +386,22 @@ THREE.Path.prototype.getPoints = function( divisions, closedPath ) {
 				xRadius = args[ 2 ],
 				yRadius = args[ 3 ],
 				aStartAngle = args[ 4 ], aEndAngle = args[ 5 ],
-				aClockwise = !! args[ 6 ];
+				aClockwise = !! args[ 6 ],
+				aRotation = args[ 7 ] || 0;
 
 
 			var deltaAngle = aEndAngle - aStartAngle;
 			var angle;
 			var tdivisions = divisions * 2;
 
+			var cos, sin;
+			if ( aRotation ) {
+		
+				cos = Math.cos( aRotation );
+				sin = Math.sin( aRotation );
+
+			}
+
 			for ( j = 1; j <= tdivisions; j ++ ) {
 
 				t = j / tdivisions;
@@ -408,6 +417,14 @@ THREE.Path.prototype.getPoints = function( divisions, closedPath ) {
 				tx = aX + xRadius * Math.cos( angle );
 				ty = aY + yRadius * Math.sin( angle );
 
+				if ( aRotation ) {
+
+					// Rotate the point about the center of the ellipse.
+					tx = ( tx - aX ) * cos - ( ty - aY ) * sin + aX;
+					ty = ( tx - aX ) * sin + ( ty - aY ) * cos + aY;
+
+				}
+
 				//console.log('t', t, 'angle', angle, 'tx', tx, 'ty', ty);
 
 				points.push( new THREE.Vector2( tx, ty ) );