On 10/29/06, William Henney <[EMAIL PROTECTED]> wrote: > > Just a last one: > > I really need to implement MetaPost-like Bézier curves, "z0..z1" draws a > > Bézier curve from z0 to z1 without having to calculate the control > > points. Is there something similar in PyX and if not, where to find any > > reference ? > > As far as I know, there is nothing built in to PyX for doing this. It > would be great if there were! > > If you want to implement this yourself, then the wikipedia article > looks like a reasonable general introduction > (http://en.wikipedia.org/wiki/B%C3%A9zier_curve). The way metapost > does it seems to be reasonably well documented - see > http://www.tlhiv.org/MetaPost/documentation/, particularly > Metapost_Curves.pdf >
I just found a better reference. This is John Hobby's original paper from 1985 on the algorithm that got used in metapost: ftp://db.stanford.edu/pub/cstr/reports/cs/tr/85/1047/CS-TR-85-1047.pdf You also might want to look at how this is done in asymptote (http://asymptote.sourceforge.net). They seem to have reimplemented Hobby's algorithm and also have generalized it to be invariant under 3D transformations. Cheers Will -- Dr William Henney, Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Campus Morelia ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ PyX-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/pyx-user
