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polygon detection from line segments

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Click and drag to draw line segments <br/> 'd' finds polygons/toggle drawing polygons<br/> 's' toggles drawing line segments<br/> 'i' toggles drawing intersections<br/> 'n' toggles drawing nodes<br/> 'c' toggles drawing connections<br/> Right-click to find the polygon bounding your click. 'p' toggles drawing this polygon
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