Move the mouse in a circle around the knobs. Left knob moves stylus up and down. Right knob moves stylus left and right. To make diagonals mouse wheel or up/down arrow also controls stylus up and down To clear move mouse back and forth quickly in the middle of the screen. (like shaking it)
Credits to Ohio Art Company for the Etch-A-Sketch. TONS of people who have written Etch-A-Sketch programs - Thanks for the idea
