Hi, I would like to get some feedback on the implementation of vector legend which Adam will start working on soon as part of GSoC.
Basically, the implementation would be in Python using d.graph which allows to draw shapes, symbols, lines and text. The first implementation would solve only basic things. GUI takes the series of d.vect commands and turns it into a text file in format: symbol color1 color2 size width text the legend symbols would be always the GRASS symbols, so even line, areas would be symbols. We would add new symbols for lines and areas, for example straight and crooked line, some irregular shape for areas. color1 is outline color color2 is fill color size is symbol size width is line width text is legend label so for example: legend/line red none 5 2 State border then each line of the legend will be drawn with d.graph. This format could be general enough to support more complicated cases (thematic vector?). What is not clear to me now is how the legend module will be called from d.mon wx0 and cairo. In GUI, it can automatically create this text file, but in d.mon cairo there is currently no way to get the d.vect commands (d.save is not in G7). So when scripting, users would have to write the input text file specifying the legend. Or the input could be a list of d.vect commands in a file if that would be more convenient. But when using d.mon wx0, it would be convenient to use d.vect.legend without any parameters, because the GUI knows the layers. So maybe we need some kind of wrapper module on top of the lower level implementation. I am sorry if this sounds confusing, but this can be decided later. What about the name? d.vect.legend (like t.vect.list) d.legend.vect (like v.what.rast) d.vlegend Thanks for any feedback, Anna _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
