pst-fourbarlinkage – Draw articulated quadrilaterals

An Articulated Quadrilateral is a four-bar linkage mechanism (four rods connected by hinges) that changes shape as its joints move, creating complex, predictable motions used in machines like pedal cranks, lamps, and even for generating curves, functioning as a simple, one-degree-of-freedom system with fascinating, non-intuitive movements and applications in engineering.

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