On 2009-08-19 15:11-0500 Hezekiah M. Carty wrote: > I would like to add support for loading segmented colors scales with > plspal1, using plscmap1a rather than plscmap1la. This way, the colors > would be separated by distinct cut-offs rather than continuous > transitions. See the color bar used by the US National Weather > Service radar images as an example: > > http://radar.weather.gov/ridge/radar.php?rid=lsx&product=N0R&overlay=11101111&loop=no > > This is a fairly straightforward change, and I have prepared it > locally. However, two approaches seem reasonable to me and I would > like to as for others' opinions before settling on one. > > The first, and the one I have implemented, is a new file format. > Rather than a "v2" header, this one has a "v2s" header (s = > segmented). No reverse field is needed, as it is not applicable here. > This format is otherwise the same as the existing v2 format. > > The second option I thought of after implementing the v2s file format > code is to change the plspal1 API to take a second argument to > determine if the file should be interpreted as discrete values or > interpolation points. Something similar to "plspal1(filename, true)" > for an interpolated color map and "plspal1(filename, false)" for a > segmented color map. > > I like the second option more because the same color palette files can > potentially be used for multiple purposes. It does, however, require > a small API change to plspal1 (adding a PLBOOL parameter) which would > then have to be propagated to all the language bindings. > > Any thoughts? I understand that this is rather poor timing, given the > number of "added plspaln to language X bindings" Subversion commits > there have been recently. This has unfortunately been my first chance > to dig in to this section of code and see how it works.
I couldn't get the above link to work for me so I am having some trouble envisaging what you want to do. Just to confirm I understand what you are proposing, will you be calling plscmap1a as an alternative to plscmap1la within plspal1 for the discrete case? Assuming we all agree this is a worthwhile thing to do, now (i.e., before our first official release with plspal1) is the time to be changing the API rather than after the release. I would be willing to help you with the propagation work so let's not be concerned about that prospect, and instead make sure we have the API we want. 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 __________________________ ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
