I found a great doc I am linking. The 4 spline method we are using has an error tolerance of 2.7*10^-4, which I am pretty sure is coming into play here. If we move to an 8 spline approach, it would reduce the error a few orders of magnitude.
http://www.tinaja.com/glib/ellipse4.pdf - Charlie On Dec 8, 2007 9:09 AM, John Hunter <[EMAIL PROTECTED]> wrote: > On Dec 7, 2007 6:02 PM, James Evans <[EMAIL PROTECTED]> wrote: > > > There appears to be an issue with the agg backend with how it is drawing > > ellipses (or maybe it is how matplotlib uses agg), but the attached script > > shows how a point, which should be coincident with the center circle, but it > > is not. The second plot shows the same data, but using a custom (and much > > slower) algorithm for drawing the ellipses, where the point is properly > > coincident. > > Thanks for the test case James -- I will try and sort this out ASAP. > Michael, do you see the same on the transforms branch? The branch is > on a newer version of agg so if not, perhaps it is a simple matter of > upgrading agg on the trunk. I'm travelling currently bt will be back > omorrow and ill look at this ASAP. > > JDH > > ------------------------------------------------------------------------- > SF.Net email is sponsored by: > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://sourceforge.net/services/buy/index.php > _______________________________________________ > Matplotlib-devel mailing list > Matplotlib-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel > ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
