ELLIPTICALARC3

An elliptical arc through three points.

Syntax

ELLIPTICALARC3 start,through,end,ratio
ELLIPTICALARC3 @id,start,through,end,ratio,layer

Argument	Meaning
start	The point it starts at.
through	A point it passes through, between the two.
end	The point it ends at.
ratio	The other axis of its ellipse as a fraction of the one along the line from start to end: a number, a variable or any expression.

The id, layer and any settings after it are the element settings.

Examples

P4=[250,100]
RATIO1=0.5
ELLIPTICALARC3 P0,P4,P1,RATIO1

ELLIPTICALARC3 example

Notes

One axis of the ellipse lies along the line from start to end, and the other is ratio times it. The centre, size and direction are worked out from the three points (and the ratio) whenever they change, so the arc always passes through all three, and it can be joined at its ends. A ratio of 1 is the circular arc through them, as ARC3 draws. The three points must not be in a straight line, and the ratio must be more than 0.