Below are some java experiments in interactivity.

Dotty

Click below to make a dot.

Lines

Click and drag below to make lines. Or just click to make a dot.

Go back to the beginning.
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Simple Drawing 1

Click and drag to do a simple drawing.

Simple Drawing 2

Click and drag to do a simple drawing. Now refreshes.

Simple Drawing 3

Click and drag to do a simple drawing. Now refreshes, with lines.

Simple Circles

Click to draw with circles too.

Moving Circles

Click to draw with animated circles.

Random Boxes

Random Coloured Boxes. Click to change.