Hello to all.
I know some Python and I am able to use inkscape develop curve B-Spline. The Spyro curbas are fine for artistic themes but the B-Spline give greater accuracy with less work. Not quite where to begin. I have the mathematical formula for creating splines that I got Internet, I have always worked with programs in script and not much to compile C or anything Can you help me with the first / ... steps?
Greetings from Pamplona. Sorry for my English.
Hi Jabier,
An extension to draw B-Spline curves sounds good, but how do you plan on storing these curves in SVG format? SVG only supports quadratic and cubic Bézier curves, and Inkscape only cubic Béziers. Therefore I guess you should store the B-Spline curve as a group of Bézier curves (I assume you know that a B-Spline can be described as a piecewise Bézier curve).
Therefore, a cubic B-Spline curve should be the easiest. A quadratic one is also possible, but you would have to degree-elevate these quadratic Béziers to cubic Béziers. Higher order doesn't seem to be possible.
Regarding the formula/expression for B-Splines, I take it that you mean the Cox-deBoor recurrence relation?
Do you plan on supporting any knot-vector, or only uniform ones that are closed (i.e. repetitive knots at the start and end)? Also, NURBS (Non-Uniform Rational B-Spline) don't seem to be possible at the moment (no support for rational curves, at least not yet).
Furthermore, the Inkscape forum would also be a good place to discuss this. Looking forward to any progress!
Best regards, Pieter
On Sun, 02 Sep 2012 11:24:23 +0200 Jabiertxo Arraiza Cenoz <jabier.arraiza@...2893...> wrote:
Hello to all.
I know some Python and I am able to use inkscape develop curve B-Spline. The Spyro curbas are fine for artistic themes but the B-Spline give greater accuracy with less work. Not quite where to begin. I have the mathematical formula for creating splines that I got Internet, I have always worked with programs in script and not much to compile C or anything Can you help me with the first / ... steps?
Greetings from Pamplona. Sorry for my English.
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participants (2)
-
Jabiertxo Arraiza Cenoz -
Pieter Barendrecht