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Simple 2D Linkage Simulation

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A simple simulation of a 2D mechanical linkage. This is an example of a robotic arm, and its reach. For demonstration, both possible states of the arm is displayed. The yellow circle shows the reach of the linkage. The red/blue dot shows the position of the linkage joint (also the intersections of the circles). Math: http://paulbourke.net/geometry/circlesphere/ Controls: Click / Drag - Moves the intended location around. Up / Down - Increase / Decrease radius of outer link. Left / Right - Increase / Decrease radius of inner link. ENTER - Sets intended location to the center.
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