On Sun, Apr 26, 2009 at 8:53 PM, Alan W. Irwin <ir...@beluga.phys.uvic.ca> wrote: > I suggest you go ahead and implement any improvement you would like to see > in PLplot axis scaling. Of course, be sure and test such improvements for > all anticipated QSAS axis scaling needs.
Would it be considered reasonable to some form of user-customizable axis labeling API in PLplot by providing callbacks similar to the pltr functions used by plcont and friends? The axis labeling code could remain mostly as-is. However, when a custom labeling function is defined, rather than rendering the text which matches the actual number at a given axis location, that number would be passed to the user-provided function. This function would return a string with the appropriate label based on the provided floating point value. If the user wants to capture extra label information in this function (scale magnitude, for example) they could do so. Something along the lines of (pseudo-code): --- function geo_label_x x: if x > 0 then "abs(x) E" else if x < 0 then "abs(x) W" else "0" function geo_label_y y: if y < 0 then "abs(y) S" else if y > 0 then "abs(y) N" else "Equator" plset_axis_label_funcs(geo_label_x, geo_label_y) --- >From here, rather than the axis labels for (-5, -5) being rendered as "-5" and "-5", then would be rendered as "5 W" and "5 S" respectively. I have something along these lines in place for the OCaml PLplot bindings, though I am still getting the code cleaned up before releasing it. Having this or something similar as a part of core PLplot would, I think, be useful. It could be used for time axes (either separate from or in conjunction with the new time handling code in PLplot), lat/lon labeling or other custom labeling purposes. If this approach is deemed acceptable I would be happy to help as much as I am able with the implementation. Hez -- Hezekiah M. Carty Graduate Research Assistant University of Maryland Department of Atmospheric and Oceanic Science ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensign option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
