On 2011-03-03 12:41-0800 Alan W. Irwin wrote: > Please test -eofill (and not) for example 27 for both the Apple > platform and the Microsoft Windows platform and report back results. > Such tests will show whether there exists any platform that does > correct filling in either the even-odd or nonzero winding number fill > rule cases for self-intersecting boundaries. The results may also > support the hypothesis that every platform has consistently copied bad > fill code from a common (X?) source, and that would be an interesting > result as well.
As of revision 11594 I have sorted out all the Linux fill issues (with and without -eofill) for example 27 for both python and C. The results with -eofill are not only correct but also beautiful. The results without -eofill are also correct (symmetrical). The issue was an incorrect windings number that so complicated the boundary (with many duplicate boundaries) that correct fills were being generated that looked incorrect for the -eofill case. The incorrect windings also caused a large last boundary segment that introduced asymmetries into the case without -eofill. My thanks to M Joonas Pihlaja of the cairo team who gave me a strong hint that helped me solve this windings issue. Now that the issue has been fixed, a nice side benefit is NPTS can be reduced by a factor of 10 without compromising the smooth-looking results. Please propagate these example 27 changes to all other languages. Also, please try out example 27 with and without -eofill for both Mac and Windows platforms to make sure fills on non-Linux platforms are also working correctly for self-intersecting boundaries. Assuming that is verified the urgency of figuring out the Master's thesis on partitioning polygons with self-intersecting boundaries is not nearly as urgent. However, at some date in the distant future I think we may need to implement that logic for the case where we are dealing with filling a _clipped_ polygon with self-intersecting boundaries. Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); PLplot scientific plotting software package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
