Hi Larry, Le 06/02/2014 19:31, Larry Shaffer a écrit : > Hi Hugo, >
> What about generating individual PDF outputs for each 'layer' (i.e. a > layer or group of layers in layer legend) first, then combining them > into a PDF as layers? Hmmm, that could also work :) > > This is totally untested, but when using GDAL to generate a geospatial, > layered PDF, could the individual 'layer' PDF outputs be piped back into > GDAL as DATASOURCEs for individual layers? There seems to be a set order > for generating the layers, e.g. raster on bottom with vector layers over > top, instead of random instertion, e.g. raster on bottom, then vector, > then raster. You might want to ask Mr. Warmerdam about how flexible the > PDF layer writing process is, and whether external PDF content can be > streamed through to layered output (instead of having any geometries > read and styled). There is the EXTRA_STREAM=content creation option, but > I don't know if it can be used multiple times to insert external PDFs as > layers. Thanks for this. I have to dig deeper GDAL's PDF writing capabilities, but it seems promising. > > Also, I think the blending modes of individual layers/groups would have > to be migrated to PDF-specific (Postcript?) definitions, since each will > be rendered separately. Surely standard blending modes for layers can be > defined in PDFs (?). That would not be that easy to correctly support blending modes. There is something in the PDF reference related to standard blending modes, but I have no idea yet how it could be linked to layers ... -- Hugo Mercier Oslandia _______________________________________________ Qgis-developer mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-developer
