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Diffstat (limited to 'src')
| -rw-r--r-- | src/live_effects/lpe-powerstroke-interpolators.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/live_effects/lpe-powerstroke-interpolators.h b/src/live_effects/lpe-powerstroke-interpolators.h index f08259eb3..986bd3544 100644 --- a/src/live_effects/lpe-powerstroke-interpolators.h +++ b/src/live_effects/lpe-powerstroke-interpolators.h @@ -203,11 +203,18 @@ private: CubicBezier calc_bezier(Point p0, Point p1, Point p2, Point p3) const { // create interpolating bezier between p1 and p2 + // Part of the code comes from StackOverflow user eriatarka84 + // http://stackoverflow.com/a/23980479/2929337 + // calculate time coords (deltas) of points + // the factor 0.25 can be generalized for other Catmull-Rom interpolation types + // see alpha in Yuksel et al. "On the Parameterization of Catmull-Rom Curves", + // --> http://www.cemyuksel.com/research/catmullrom_param/catmullrom.pdf double dt0 = powf(distanceSq(p0, p1), 0.25); double dt1 = powf(distanceSq(p1, p2), 0.25); double dt2 = powf(distanceSq(p2, p3), 0.25); + // safety check for repeated points double eps = Geom::EPSILON; if (dt1 < eps) |