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Gothic windows

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Program for drawing basic gothic window tracery. Based on E. C. Philip's article "Some Applications of Mathematics to Architecture: Gothic Tracery Curves".
Hold 1-6 (below) and use mouse to change parameters: 1. Left/right mouse button increases/decreases number of petals. 2. Left/right mouse button increases/decreases number of times each petal wraps around centre. 3. Drag left mouse button left/right to change displacement of petals from centre. 4. Drag left mouse button left/right to change extrusion of petals. 5. Drag left mouse button left/right to twirl petals ccw/cw.
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