The Custom Shape allows you to create your own shape.
* With the Custom Shape toolbar button selected, click in the Canvas where you want to place the first vertex.
* Click where you want to place the next vertex to create a straight segment.
* By continuing to click, you create a path made of straight line segments connected by corner points.
* To create a curved segment, click and drag the direction line handle to create the curve that you want.
* To finish editing press the Enter or Escape key.