draw-circle-sector

Arguments: stream center radius start-angle length-angle

Draws on stream a circle-sector, that is an arc and the bounding radii to produce a shape like a piece of pie, starting at start-angle and subtending length-angle, with the radius and center as specified.

center must be a position (see make-position). stream should be a cg-stream.

Angles are measured clockwise starting from the positive x-axis (taking the center as the origin). Thus start-angle 0 is the due East point if the circle is thought of as a compass. Start-angle 0 and length-angle 90 draws the lower right quarter, now thinking of the circle as a pie. The endpoint coordinates may be determined by calling ellipse-start-and-end.

See erase-circle-sector.

See also cg-drawing.htm.

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Created 2015.5.21.