On 2010-05-22 04:48+0100 Steve Schwartz wrote: > Alan, > > For what it's worth I have noticed similar parallelogram quirks with > plw3d with the altitude set to 90 degrees and different azimuths. For > azimuths 0, 90, 180, etc. the result is a rectangle corresponding to the > xy plane. But for other azimuths this projection is a parallelogram. See > the attached plots which are from x08 but with the alt set to 90. I > would expect this to always give a rectangle regardless of the azimuth.
Hi Steve: I confirm the issue you reported. Notice also that the axis labels are not correct; those should degenerate into a straight line at alt 90. If nobody comes up with a fix in the next day or so could you please report this issue on the SourceForge bug tracker? We now encourage using that bug tracker to report problems after they have been discussed here to make sure there is no quick solution. Today I plan to report the parallelogram issue separately on the bug tracker. It turns out the high alt bug is not related; uncommenting the one-line fix in calc_diori made no difference to the (bad) high alt results. Further news on the parallelogram issue is -dev psc -portrait (which is the same as -dev psc -ori 1 -freeaspect) illustrates the side effects of the fix (clipping issues and circular symbols rendered as ellipses). Since portrait mode is pretty fundamental for the PostScript devices the fix should remain commented until the reason why it works is understood and all those side effects are dealt with as well. 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 __________________________ ------------------------------------------------------------------------------ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
