GraphicStroke : RelativeOrientation

[ebocher]

Implement all RelativeOrientation properties

RelativeOrientation tells what angle to rotate the graphic to when it is plotted. Allowed values are “normal” (default) meaning rotated to the mathematical normal (perpendicular) of the line at the plotting point, “line” which means to rotate to the direction of the line at the plotting point, “portrayal” which means always upright with respect to the parent portrayal environment (usually the map), and “normalUp” which means to rotate with respect to the normal of the line, but rotate an additional 180 degrees if the graphic would otherwise end up pointing downward with respect to the parent portrayal environment.