Posted by Allen on Apr 06, 2012; 12:39am
URL: https://forum.librecad.org/Tangent-arcs-circles-or-ellips-tp5604952p5621792.html

On 12-04-03 04:30 PM, dxli [via LibreCAD] wrote:

draw a tangential circle for three existing entities:

currently we have "draw circle inscribed", need to get combinations of:

line/circle (arcs are treated as circles here, ellipse will be added after line/circle)

One way to do it:

find intersections between parabola and hyperbola. LibreCAD has its own quartic equation solver, so, this can be done by algebraic methods.

I wonder whether there's an easier algorithm by approximate methods.

dxli

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NAML

I don't know how much "easier" an algorithm by means of approximate methods would be, but, it's being useful to some users would depend on what kind of resolution they would have need of. One thing about absolutes is you can't go wrong.

Allen