Andrew Ross wrote: > On Sun, Jul 05, 2009 at 09:15:24PM -0400, Hazen Babcock wrote: >> Hello, >> >> As of v10119 you can now specify the color table to use for color table >> 0 or color table 1 as a command line argument to PLplot. For example: >> >> ./x01c -cmap0 /path/to/cmap0a.pal -dev xcairo >> >> Will load the cmap0a.pal file and use the information in that file to >> initialize PLplot's color table 0 prior to plotting. Similarly: >> >> ./x01c -cmap1 /path/to/cmap1a.pal -dev xcairo >> >> Will load the cmap1a.pal file and use the information in that file to >> initialize PLplot's color table 1 prior to plotting. >> >> As part of this effort the PLplot API has two new additions: >> plspal0(filename) - Set the color table 0 palette based on the cmap0.pal >> format file specified by filename. >> plspal1(filename) - Set the color table 1 palette based on the cmap1.pal >> format file specified by filename. >> >> Example .pal format files can be found in plplot-source/bindings/tk. >> Hopefully this addition will make it easier for people to use their >> preferred color scheme. > > Hazen, > > Sorry for joining this thread rather late in the day, but I've just > got chance to try this out. Firstly, I think it is a great idea, so > thank you Hazen for implementing it. Some comments. > > 1) The .pal files in bindings/tk are pretty hideous! Can we get some > better examples. I have some palettes I regularly use which I would > be willing to donate...
Sounds good to me. Should we go ahead with the plan to create a cmaps directory and put all the palettes there? > 2) When I tried to create a .pal file I realised that the current file > format assumes that the position value is an integer in the range 0-100, > whereas plplot actually uses a PLFLT in the range 0-1. This might not > be significant for most purposes, but for example I sometimes use > continuous colour scales with a narrow band of values picked out in a > different colour, either for emphasis or for ensuring that values around > zero are white. The resolution offered by the .pal files might not be > sufficient and I would rather not saddle us with something now that might > cause problems later on. I think the original reason was that tk provided > poor float support. Let's not saddle the rest of plplot with that. How about we assume that the control points are specified from low to high and renormalize the range to 0.0 - 1.0? This would allow specifying the scale with either integers or floating point numbers. -Hazen ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
