This example demonstrates how to place image icons on the vertices. The demo also shows how to extract the outline of the opaque part of a transparent image and create a java.awt.Shape. By doing so:

• Vertex selection is constrained to the visible part of the image
• Edge arrows follow the outline of the visible part of the image.

Be sure to try out the mouse listeners:

Picking Mode:

• MouseButtonOne press on a Vertex or Edge to select it
• MouseButtonOne+Shift press on a Vertex or Edge to add or toggle selection
• MouseButtonOne+drag on a Vertex to move all selected vertices
• MouseButtonOne+drag to select Vertices in a rectangle
• MouseButtonOne+Shift+drag to add to selection with Vertices in a rectangle

TransformingMode:

• MouseButtonOne+drag to translate the display
• MouseButtonOne+Shift+drag to rotate the display
• MouseButtonOne+ctrl(or Command)+drag to shear the display

Both Modes:

• MouseWheel to scale. When scale < 1, view is scaled. When scale > 1, layout is scaled.