22 Mar
2012
22 Mar
'12
9:17 a.m.
On 21-03-12 23:52, Johan Engelen wrote:
Hi all, After busting my brain for two evenings, I've succeeded in creating properly rounded joins for powerstroked paths... The quick explanation:
- for constant stroke width paths: looks like SVG rounded joins
(circular arc)
- for non-constant width paths, it is not possible to round with a
circle and keep the curve smooth (tangents will not match). So the rounding is done with an elliptical arc, for which the tangents *do* match. There are many possible ellipses, and I decided for the one with minimum eccentricity. This converges to a circle for constant stroke width.
Another interesting option could be a spiro curve, as it has constant change in curvature and will probably also converge to a circle.