sweepAngle

Clockwise angular sweep of a partial ellipse (sector / pie slice), starting at startAzimuth. When 0° or 360° the ellipse renders as a closed shape (default behavior). Otherwise the geometry becomes a wedge: the perimeter spans `startAzimuth`, `startAzimuth + sweepAngle` and is closed through the ellipse center, producing a pie-slice fill plus two radial outline edges from the center to the arc endpoints.

Throws