The simplicity of this routine is why I like it so much. You simply run the command and then select a polyline and it displays temporary arrows that show the direction of the polyline. Once you either zoom in or out, or even use RE [enter] for a REGEN, the temporary arrows will stop displaying.
All credit goes to Luis Esquival and RonJon from the.swamp.org for sharing and editing this routine.
Below – Various polylines have their directions shown
As an extra bonus, this routine works on 3DPOLYLINEs. Even though the arrows aren’t exactly aligned, it is still nice to have a way to show the direction…
getarcsegment cen r fromvertex p2 a1 a2 d fromvertex p2 a1 cen fromvertex a2 cen p2 a1 a2 a1 a2 d r a2 a1 d r a2 a1 d r getbulgedata bulge fromvertex p2 dir theta beta radio dat bulge theta
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