Function GraMarker() Foundation
Displays a marker (point).
GraMarker( [<oPS>], [<aPoint>] ) --> lSuccess
The return value of GraMarker() is .T. (true) if the marker was drawn, otherwise it is .F. (false). If the return value is .F., the cause of error can be determined with GraError().
The function GraMarker() marks a single point at the position <aPoint>. Various marker types are available (cross, circle, square etc.). They must be selected before the output of a marker by calling the function GraSetAttrMarker(). The default marker is the #define constant GRA_MARKSYM_CROSS. The function GraMarker() does not change the pen position.
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