Possible enhancements

OGLEdit is very simplistic and does not employ the more advanced features of OGL, such as:

• attachment points (arcs are drawn to particular points on a shape)
• metafile and bitmaps shapes
• divided rectangles
• composite shapes, and constraints
• creating labels in shape regions
• arc labels (OGL has support for three movable labels per arc)
• spline and multiple-segment line arcs
• adding annotations to node and arc shapes
• line-straightening (supported by OGL) and alignment (not supported directly by OGL)

These could be added to OGLEdit, at the risk of making it a less useful example for beginners.