Convert Spline / Polyline with bulges

[tukuyomi]

Hello !

Qcad has tools to explode Splines in straight segments, but not in arcs.

Is anyone familiar with an algorithm to convert spline to Arcs --with a bit of tolerance, of course?

Thanks

[Husky]

Hi,

Qcad has tools to explode Splines in straight segments, but not in arcs.

Explode a Spline = Polyline,
Explode a Polyline = Lines and Arcs - whenever possible,

[tukuyomi]

Am I missing some settings here ?

Please consider the attached drawing. If I explode the splines here, I only get straight segments.

Even if I select minimal values in App Preferences > Modify > Explode, I still get too much straight segments, meaning too much G01 gcode to write to my old Laser cutting machine.

What I would like is the possibility to explode Splines as Lines and Arcs --as Ellipses do--, with some kind of tolerance.

By the way, the function that draws those Splines is a Sine function.

I'm trying to write with a script based --not on splines this time, but-- on Polylines with bulges values, but those are tricky to find/calculate :p

[andrew]

tukuyomi: Please indicate what version of QCAD you are using, thanks.

[tukuyomi]

Oops I updated to 3.15.5, and indeed, Splines are exploded to polylines and arcs ! Thanks !

I increased the Spline Tolerance in the Apps Preferences, but I still get too much entities ; weird, using the drawing I posted above, on the bottom spline, there are far more arcs toward the left.

Is it possible to increase the tolerance more ? I tried to put a big value (10 and even 100), but it did not have effect on the exploded spline.

[andrew]

I've issued a report at:
http://www.qcad.org/bugtracker/index.ph ... sk_id=1479