There are a couple of ways to create your own shapes, but only two are preferred. Unfortunately, the easiest way, using binary operations on shapes (which is covered in a later section) is only available in OmniGraffle Pro.
Using this tool requires some planning ahead as the shape you'll create will be a closed shape from the start. This can be very confusing—and of all the tools available in OmniGraffle, this is the most difficult one to use.
This tool will let you draw both straight lines and Bézier curved lines. You learned about the characteristics of Bézier lines in Chapter 2,
You can start the creation ...