Clicking on a JPanel to draw shapes

Question

I have a JFrame containing 3 JPanels; Options, menu, canvas. In options there are a number of JButtons representing shapes. The aim is to click on the JButton of a shape e.g. re

Answer 1

Absent a complete example, it's hard to say. I'd expect your DrawingCanvas to override paintComponent() in order to render the accumulated Shape instances in shapeList. You might compare your approach to that shown in GaphPanel, cited here.