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True Offset Ellipse
Tip# 3590 By Kent Cooper On 28-Feb-2011
Rated By 1 users Downloaded : 677
Categories : Curved Objects, 2D Operations
Software type : AutoCAD 2011
Rename File To : OffsetEllipse.lsp
Offset and get a true ellipse as a result, not a spline.

Frequent contributor Kent Cooper shares a routine that allows you to offset an ellipse where the result is also a true ellipse. Normally if you offset an ellipse in AutoCAD, the resulting object is a spline. Kent's routine creates an ellipse whose quadrant points are exactly the desired distance away from the equivalent points on the original ellipse. Other points along the new ellipse entity are not necessarily a consistent distance away from the old one, and that is why AutoCAD creates a spline. Start by loading the LISP file, then type in the command OFEL. Kent's code contains lots of comments, and plenty of technical details about how this routine works and why. Good job, Kent.


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