Draw a geodesic curve
Note that the geodesic curve is transformed into graphical coordinate space for plotting, so that a straight line in physical coordinates may result in a curved line being drawn if the Mapping involved is non-linear. Any discontinuities in the Mapping between physical and graphical coordinates are catered for, as is any clipping established using astClip.
If you need to draw many geodesic curves end-to-end, then the astPolyCurve function is equivalent to repeatedly using astCurve, but will usually be more efficient.
If you need to draw curves which are not geodesics, see astGenCurve or astGridLine.
No curve is drawn if either of the "
start"
or "
finish"
arrays contains any
coordinates with the value AST__BAD.
An error results if the base Frame of the Plot is not 2-dimensional.
An error also results if the transformation between the current and base Frames of
the Plot is not defined (i.e. the Plot’
s TranInverse attribute is zero).