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This module includes any mathematical methods needed for PIDDLE.
It should have no dependencies beyond the Python library.
So far, just Robert Kern's bezierArc.
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f� � ��9|S ) a� bezierArc(x1,y1, x2,y2, startAng=0, extent=90) --> List of Bezier
curve control points.
(x1, y1) and (x2, y2) are the corners of the enclosing rectangle. The
coordinate system has coordinates that increase to the right and down.
Angles, measured in degress, start with 0 to the right (the positive X
axis) and increase counter-clockwise. The arc extends from startAng
to startAng+extent. I.e. startAng=0 and extent=180 yields an openside-down
semi-circle.
The resulting coordinates are of the form (x1,y1, x2,y2, x3,y3, x4,y4)
such that the curve goes from (x1, y1) to (x4, y4) with (x2, y2) and
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