Am Sun, 17 Aug 2008 12:50:03 -0700 schrieb Dane Springmeyer:
Sorry, I don't know much about the python binding. Never used it in the
past.
regards
Andreas
> Andreas,
>
> Thats great. So do you know if the `mapnik::memory_datasource` is
> exposed in the python bindings?
>
> Dane
>
>
> On Aug 17, 2008, at 11:58 AM, Andreas Volz wrote:
>
> > Am Thu, 07 Aug 2008 11:15:02 +0200 schrieb Ric S:
> >
> >> Hi folks,
> >>
> >> I have successfully setup mapnik. Generating a map already works.
> >> Now I would like to draw gps points into the map, I was searching
> >> the net for a few hours to get some info, unfortunately
> >> I still have now clue yet how this can be done with mapnik.
> >> I assume I have to create a layer and add points to it. I could not
> >> find an example how to draw points.
> >>
> >> I would like to set gps points in my map. Could you please show me
> >> how to add a single gps point to this map/layer. The code from
> >> generate_image which I used:
> >> ...
> >> z = 10
> >> imgx = 100 * z
> >> imgy = 100 * z
> >>
> >> m = Map(imgx,imgy)
> >> load_map(m,mapfile)
> >> prj = Projection("+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0
> >> +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m [EMAIL PROTECTED] +no_defs
> >> +over") c0 = prj.forward(Coord(ll[0],ll[1]))
> >> c1 = prj.forward(Coord(ll[2],ll[3]))
> >> bbox = Envelope(c0.x,c0.y,c1.x,c1.y)
> >> m.zoom_to_box(bbox)
> >> im = Image(imgx,imgy)
> >> render(m, im)
> >> view = im.view(0,0,imgx,imgy) # x,y,width,height
> >> view.save(map_uri,'png')
> >
> > I've done that some time ago. Worked well. But then I deactivated
> > the code for some reason. Not sure if it works at the moment:
> >
> > void MapnikSource::insertDataPoint (double x, double y, const char
> > *key, const char *value, const char* layer)
> > {
> > /*Layer lyr (layer);
> > datasource_ptr ds (new mapnik::memory_datasource);
> > feature_ptr f (feature_factory::create (keyID));
> >
> > geometry_ptr point (new point_impl (-1));
> > point->move_to (x, y);
> >
> > f->set_geometry(point);
> >
> > transcoder tr ("utf-8");
> > (*f)[key] = tr.transcode (value);
> >
> > if (ds)
> > {
> > mapnik::memory_datasource *mem = dynamic_cast
> > <mapnik::memory_datasource*> (ds.get ());
> >
> > if (mem) // check if cast is ok!
> > {
> > // do something with memory_datasource e.g.
> > push some features
> > mem->push(mapnik::feature_ptr(new
> > mapnik::Feature(-1)));
> > mem->push (f);
> > }
> > }
> >
> > lyr.set_srs ("+proj=latlong +datum=WGS84");
> > lyr.add_style ("enigator");
> > lyr.set_datasource(mapnik::datasource_ptr(ds));
> > map->addLayer (lyr);
> >
> > keyID++;*/
> > }
> >
> > This is how I called it:
> >
> > m_mapnikSource.insertDataPoint (x, y, "enigator", "wptred",
> > "enigator");
> >
> > This is the reference in the XML file:
> >
> > <Style name="enigator">
> > <Rule>
> > <MaxScaleDenominator>50000</MaxScaleDenominator>
> > <Filter>[enigator]='wptred'</Filter>
> > <PointSymbolizer file="/home/andreas/src/svn/enigator/trunk/
> > data/symbols/wptred.png" type="png" width="32" height="32" />
> > </Rule>
> > </Style>
> >
> > Search the history of this list with my name and around 10-12
> > month ago or so.
> > Maybe this helps you...
> >
> > regards
> > Andreas
> > _______________________________________________
> > Mapnik-users mailing list
> > [email protected]
> > https://lists.berlios.de/mailman/listinfo/mapnik-users
>
_______________________________________________
Mapnik-users mailing list
[email protected]
https://lists.berlios.de/mailman/listinfo/mapnik-users
