On Jan 9, 2008 11:53 AM, John Hunter <[EMAIL PROTECTED]> wrote: > On Jan 9, 2008 9:11 AM, Michael Droettboom <[EMAIL PROTECTED]> wrote: > > > You could comment out these two lines: > > > > x = (int)x + 0.5; > > y = (int)y + 0.5; > > > > and see if that corrects your wiggliness problem, just to confirm that > > as the source. > > > > The bigger question is -- there was probably a good reason that this > > code was put in there in the first place, so it probably isn't a good > > idea to remove it en masse. It may need to be exposed as an argument so > > some things get this behavior and others don't. I know that dashed > > lines that are perpendicular to the edges of the figure (e.g. grid > > lines) look much worse if they aren't rounded to pixel centers. But in > > general for polygons, I don't know if that's true. > > For subpixel accuracy in rendering, agg antialiasing causes different > line segments to appear different in their thicknesses if they do not > have the same subpixel values. Maxim wrote the following essay on the > subject: > > http://antigrain.com/tips/line_alignment/line_alignment.agdoc.html#PAGE_LINE_ALIGNMENT > > > For this reason, to preserve visible consistency of the segments, I > have several parts in the agg code which snaps the vertices ot the > pixel centers. I have never found a solution that seems to work in > all cases, since removing the snapto code will cause the > inconsistencies referred to above. I think should probably be a > graphics context property (which could get the information from an > artist property) so at least the user could control it when needed. > > > JDH >
Hi John, Hi Mike, I commented out the two lines in draw_polygon() and am now getting very smooth arrow movement in my animations. It looks GREAT! I've got my system here now set up so I can easily turn the rounding on and off, by switching the PATH, and will watch the results so I can understand more about this issue. The more I understand, the harder it looks. Being able to control this as a property of an artist would definitely work easily enough for my scenario. I'll also give the new hueristic in SVN a try and see how it works for me. Thanks for all the help! ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
