abstract class Mask {

 DisplayObject targetSpace = null;
 bool border = false;
 int borderColor = 0xFF000000;
 int borderWidth = 1;

 CanvasRenderingContext2D _context;

 Mask();

 //-----------------------------------------------------------------------------------------------

 factory Mask.rectangle(num x, num y, num width, num height) {
   return new _RectangleMask(x, y, width, height);
 }

 factory Mask.circle(num x, num y, num radius) {
   return new _CirlceMask(x, y, radius);
 }

 factory Mask.custom(List<Point> points) {
   return new _CustomMask(points);
 }

 factory Mask.shape(Shape shape) {
   return new _ShapeMask(shape);
 }

 //-----------------------------------------------------------------------------------------------

 bool hitTest(num x, num y);

 _drawCanvasPath(CanvasRenderingContext2D context);
 _drawTriangles(RenderContext context, Matrix matrix);
}