In Kicad an arc is defined by Center point X and Y, Radius, Start and End angles in 10ths of a degree and Start and End points X and Y.
This is overkill since the polar representation fully defines the Arc and the Cartesian start and end points are redundant. Some quick experiments on how kicad handles errors between the two systems tells me that I always want to make sure that the two sets of data always agree if I want to avoid surprises. A better way to express an Arc would be Center point X and Y, Start and End points X and Y and direction (clockwise or counter). This would allow you to create closed shapes that mixed straight lines with arcs to produce logic gates. The current fill option for an arc doesn't work on OR gates since one arc needs to fill on its outside. If the Start and End points are equidistant from the center then this would produce a true arc. Sometimes the start and end points are required to match other line segments end points and you need to taper the arc to make it look right. This form could handle that. Any thoughts? John Eaton
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