Posted by flywire on Sep 05, 2023; 12:30am
URL: https://forum.librecad.org/Distance-along-a-curve-tp5723382p5723403.html

I've been there. I started the cattle yards with a quarter circle arc but then realised the x and y offset was different so it was an elipse arc. The inner arc had to be adjusted to a multiple of panel sizes. An open spline requires 4 Points for 3-point splines.

LordOfBikes wrote

For an exact straight distance usually a circle is used. Then  the intersection is the desired point.
But, I just tested it, this doesn't work for splines too, neither does Snap on Intersection work nor can I divide the spline near the intersection.

It seems snapping to an intersection with a spline is unreliable, I snapped to the circle estimating the spline intersection within a tolerance.

Drawing a circle and then snapping a line is really clunky. What is really required here is to draw a line, say horizontal (given the angle is zero) with a given length with rotation turned on. The first point is the rotation point and the second point is the reference point. I imagine users could define that tool in lc3.