Examples:
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Processing SketchPad is an experiment into just how "live" live programming can get.

The right half is taken up by the script editor -- note that when you change the script, the PApplet updates itself pretty soon after!

The upper-left panel is the PApplet display screen.

The lower-left panel is a "BeanShell" instance, which lets you manipulate the fields within the current PApplet.

Note that this is in no way tested... please post to the Processing discussion board with your comments and suggestions!

Source code