npm install
Use Mapnik 2.3.x branch at https://github.com/mapnik/mapnik/commit/68aaec5ac705791d59a410b0c21d335fa1985c63
Optionally use mapnik-vector-tile branch to reduce the testcase futher: https://github.com/mapbox/mapnik-vector-tile/compare/offset-debug
node test.js
out.png will have a black triangle artifact in the upper right
out2.png likely will not (for unknown reasons)
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| <Style name="contour"> | |
| <Rule> | |
| <Filter>[ele]=2330</Filter> | |
| <LineSymbolizer stroke="#000000" offset="1" clip="false" stroke-width="1" stroke-linejoin="round" /> | |
| </Rule> | |
| </Style> | |
| <Layer name="contour" | |
| srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over"> | |
| <StyleName>contour</StyleName> | |
| <Datasource> | |
| <Parameter name="type">ogr</Parameter> | |
| <Parameter name="file">merc.json</Parameter> | |
| <Parameter name="layer">OGRGeoJSON</Parameter> | |
| </Datasource> | |
| </Layer> | |
| </Map> |
| { | |
| "type": "FeatureCollection", | |
| "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::3857" } }, | |
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| ] | |
| } |
| <Map srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over" maximum-extent="-20037508.34,-20037508.34,20037508.34,20037508.34"> | |
| <Style name="contour"> | |
| <Rule> | |
| <Filter>[ele]=2330</Filter> | |
| <LineSymbolizer stroke="#000000" offset="1" clip="false" stroke-width="1" stroke-linejoin="round" /> | |
| </Rule> | |
| </Style> | |
| <Layer name="contour" | |
| srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over"> | |
| <StyleName>contour</StyleName> | |
| </Layer> | |
| </Map> |
| { | |
| "name" : "vtile-test", | |
| "main" : "./vtile-mem.js", | |
| "dependencies" : { | |
| "mapnik":"1.4.x", | |
| "queue-async":"*", | |
| "bytes":"*" | |
| } | |
| } |
| var fs = require('fs'); | |
| var zlib = require('zlib'); | |
| var bytes = require('bytes'); | |
| var mapnik = require('mapnik'); | |
| mapnik.register_default_fonts(); | |
| function vtile() { | |
| var map = new mapnik.Map(256,256); | |
| map.loadSync('./original.xml'); | |
| var filename = '14_10083_6161.vector.pbf.z'; | |
| var data = fs.readFileSync(filename); | |
| zlib.inflate(data, function(err, buf) { | |
| if (err) throw err; | |
| var parts = filename.split('_'); | |
| var z = +parts[0]; | |
| var x = +parts[1]; | |
| var y = +(parts[2].split('.')[0]); | |
| var vt = new mapnik.VectorTile(z,x,y); | |
| vt.setData(buf); | |
| var im = new mapnik.Image(256,256); | |
| vt.parse(function(err) { | |
| if (err) throw err; | |
| fs.writeFileSync('out.json',JSON.stringify(vt.toGeoJSON(1),null,1)); | |
| vt.render(map, im, {buffer_size:0}, function(err,image) { | |
| if (err) throw err; | |
| image.save('out.png',"png24") | |
| }); | |
| }); | |
| }); | |
| } | |
| function normal() { | |
| mapnik.register_default_input_plugins(); | |
| var map2 = new mapnik.Map(256,256); | |
| map2.loadSync('./json.xml'); | |
| map2.extent = [4625357.4555925857275724,4965349.357405048795044,4627803.4404977113008499,4967795.3423101771622896]; | |
| map2.render(new mapnik.Image(256,256),function(err,im) { | |
| if (err) throw err; | |
| im.save('out2.png',"png24"); | |
| }); | |
| } | |
| //normal() | |
| vtile() |
