When a path is transformed, the _length cache of its Curves should be…

… invalidated

src/path/Path.js

@@ -68,6 +68,11 @@ var Path = this.Path = PathItem.extend(/** @lends Path# */{
 			delete this._length;
 			// Clockwise state becomes undefined as soon as geometry changes.
 			delete this._clockwise;
+			// Curves are no longer valid
+			if (this._curves != null) {
+				for (var i = 0; i < this._curves.length; i++)
+					this._curves[i]._changed(Change.GEOMETRY)
+			}
 		} else if (flags & ChangeFlag.STROKE) {
 			// TODO: We could preserve the purely geometric bounds that are not
 			// affected by stroke: _bounds.bounds and _bounds.handleBounds

test/tests/Path_Curves.js

@@ -38,6 +38,11 @@ test('path.curves Synchronisation', function() {
 	path.removeSegments(1, 2);
 	equals(path.segments.toString(), "{ point: { x: 0, y: 100 } },{ point: { x: 100, y: 100 } }", "path.segments: path.add(new Point(100, 100));\npath.removeSegments(1, 2);");
 	equals(path.curves.toString(), "{ point1: { x: 0, y: 100 }, point2: { x: 100, y: 100 } },{ point1: { x: 100, y: 100 }, point2: { x: 0, y: 100 } }", "path.curves: path.add(new Point(100, 100));\npath.removeSegments(1, 2);");
+
+	// Transform the path, and the curves length should be invalidated (first, force-cache the first segment's length by accessing it
+	path.curves[0].length;
+	path.scale(2, [0, 0]);
+	equals(path.curves[0].length, 200, 'Curve length should be updated when path is transformed')
 });
 
 test('path.flatten(maxDistance)', function() {
@@ -53,4 +58,4 @@ test('path.flatten(maxDistance)', function() {
 	equals(function() {
 		return path.lastSegment.point.toString() != path.segments[path.segments.length - 2].point.toString();
 	}, true, 'The points of the last and before last segments should not be so close, that calling toString on them returns the same string value.');
-});
+});