var shape = Cx.Shape({
  polyregions: [...],
  brush:{ color:{ rgb: '000000' }}
});

shape.addPowerClipContents(figures);

var rectangle = Cx.Shape.Rectangle({
  bounds: Cx.Bounds(lx,ly,hx,hy)
, brush: brush, pen: pen
};

var rectangle = Cx.Shape.Rectangle({
  center: Px(0,0), width: 200, height: 100
, brush: brush, pen: pen
};

var polyline = Cx.Shape.Polyline({
  points: [...]
, brush: brush, pen: pen
});