What algorithm is used to draw smooth curves in real time?

[sergey900553]

Perfect freehand creates smooth curves in real time. In other applications, this requires some kind of post-processing.

It looks like some kind of spline, like a Catmull-Rom spline. But this app shows too good results. What algorithm are you using for this?

Perfect freehand smoothes in real time.

Another application uses post-processing

[colbyn]

@sergey900553 I don't think perfect-freehand is using any such formal algorithm, if you look at the implementation everything looks relatively ad-hoc (although there is a remark that comes to mind about smoothing points along a more "perfect curve").

[GreatTA1998]

Which specific files contain the implementation detail for perfect-freehand's continuous smoothing?

[colbyn]

Also for context if it helps, the perfect-freehand algorithm basically just gives you offset points, and you don't even need to render stroke outline point as as curves, if you have a high enough sampling frequency (and I suppose if the stroke diameter isn't too big) lines will be indistinguishable from curves.