Current API (from wiki):

map drawEllipse [c, a, b, angle, color, fill]

Current function draws a full ellipse.

This ticket requests that an extra optional argument is added, that allows control over how much of the full ellipse is drawn, for example:

map drawEllipse [c, a, b, angle, color, fill, degrees]

Default behavior same as for 'degrees' having value of 360, giving a full ellipse. For smaller values under 360, only part of the span of the ellipse is drawn.