[cairo] Length of bezier curve

[Plugin Everything]

Hi. I'm drawing a bezier curve and want to only stroke a portion of it, 50%
for example. So I'm using cairo_set_dash to do that, but I need to know the
length of the curve for that to work. Does anyone know how to calculate the
length of the bezier curve? Thank you.

[Behdad Esfahbod]

See:
https://github.com/fonttools/fonttools/blob/master/Lib/fontTools/misc/bezierTools.py#L142

Post by Plugin Everything
Hi. I'm drawing a bezier curve and want to only stroke a portion of it,
50% for example. So I'm using cairo_set_dash to do that, but I need to know
the length of the curve for that to work. Does anyone know how to calculate
the length of the bezier curve? Thank you.
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[Bill Spitzak]

See also the function splitCubicAtT in the same code, this may be a
better approach.

Post by Behdad Esfahbod
https://github.com/fonttools/fonttools/blob/master/Lib/fontTools/misc/bezierTools.py#L142

Post by Plugin Everything
Hi. I'm drawing a bezier curve and want to only stroke a portion of it,
50% for example. So I'm using cairo_set_dash to do that, but I need to know
the length of the curve for that to work. Does anyone know how to calculate
the length of the bezier curve? Thank you.
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behdad
http://behdad.org/
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[c***@aol.com]

Hi James,

If you have the points to your curve, then you can get the bezier points for each segment and draw each segment a different color. What kind of curve are you drawing?

This program has a couple of different cairo drawings that you can experiment with. You can change the color of a curve segment in one of the drawings to see how it looks.

Eric

https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/fish1.c