A number of folks on both mapnik-users@ and mapnik-devel@ have wanted to be able to add points dynamically, whether in C++ or in Python. A short while ago, I posted a patch to fix commented-out functionality in mapnik::memory_datasource that was needed to do so in C++ (see http://trac.mapnik.org/ticket/111).
Here I am contributing a patch (a superset of the patch attached to ticket #111) which also implements the requisite Python bindings needed to utilize the proposed "point_datasource" functionality. Artem will probably need to sort through the patch and figure out how to adapt it to his larger Mapnik design vision, but in the meanwhile, users / developers looking for this functionality can use it in the meantime. The patch file is attached to this message and to http://trac.mapnik.org/ticket/113 Sample use of this functionality is demonstrated here on github: http://gist.github.com/8702#LID26 The patch adds basic mapnik::query support, to allow geometry-based programmatic filtering, as well as a "PointDatasource" object (line 50). Points are added programmatically simply by calling "add_point", and linking the point datasource to its corresponding data layer. In this example, we plot three Mountains in Washington State. ~L
python_point_datasource.patch
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