Ellipse drawing
The following functions provide support for drawing ellipses and
elliptical arcs, either as outlines or solid filled with the current
pen pattern. Note that SciTech MGL provides the ability to draw
ellipses given a center coordinate and integer radii, or by providing a
bounding rectangle for the ellipse. The bounding rectangle versions
allow you to draw any sized ellipse, some of which will have the center
coordinate located on a non-integer half-pixel boundary.
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