Triple Touch Trace Pad
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Three trajectories define a changing triangle. Rays extend its edges to draw a polygon. Use a dual joystick gamepad and its cursor control to draw by triple touching all three vertices of this triangular stencil.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Triple Touch Trace Pad"
http://demonstrations.wolfram.com/TripleTouchTracePad/
Wolfram Demonstrations Project
Published: March 7 2011