[#1] Adds test of coloring a raster reprojected to EPSG:3857

README.md

@@ -9,6 +9,7 @@ Example of Mapnik raster colorizer
 ### Run test
 
     docker-compose run mapnik /usr/local/src/run.sh test.js
+    docker-compose run mapnik /usr/local/src/run.sh test2.js
 
 ## Raster dataset license
 

src/pg2.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Map srs="+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 +nadgrids=@null +wktext  +no_defs" background-color="white">
+  <Style name="style">
+    <Rule>
+      <RasterSymbolizer opacity="1" scaling="bilinear">
+	<RasterColorizer default-mode="linear" default-color="black" epsilon="0.5">
+          <stop color="yellow" value="0" />
+	  <stop color="green" value="240" />
+	</RasterColorizer>
+      </RasterSymbolizer>
+    </Rule>
+  </Style>
+
+
+  <Layer name="sierra_leone" srs="+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 +nadgrids=@null +wktext  +no_defs">
+    <StyleName>style</StyleName>
+    <Datasource>
+      <Parameter name="type">pgraster</Parameter>
+      <Parameter name="host">postgres</Parameter>
+      <Parameter name="dbname">sierra_leone</Parameter>
+      <Parameter name="user">postgres</Parameter>
+      <Parameter name="password">sa</Parameter>
+      <Parameter name="table">sle_pop_wm</Parameter>
+      <Parameter name="raster_table">sle_pop_wm</Parameter>
+      <Parameter name="raster_field">rast</Parameter>
+      <Parameter name="estimate_extent">true</Parameter>
+      <Parameter name="band">1</Parameter>
+      <Parameter name="srid">3857</Parameter>
+    </Datasource>
+  </Layer>
+</Map>

src/test2.js

@@ -0,0 +1,27 @@
+var mapnik = require('mapnik');
+var fs = require('fs');
+
+mapnik.Logger.setSeverity(mapnik.Logger.DEBUG);
+
+// register fonts and datasource plugins
+mapnik.register_default_fonts();
+mapnik.register_default_input_plugins();
+
+var map = new mapnik.Map(1000, 1000);
+var file = Date.now() + '.png'
+
+map.load('./pg.xml', function(err,map) {
+    if (err) throw err;
+    map.zoomAll();
+    var im = new mapnik.Image(1000, 1000);
+    map.render(im, function(err,im) {
+	if (err) throw err;
+	im.encode('png', function(err,buffer) {
+            if (err) throw err;
+            fs.writeFile('/tmp/' + file, buffer, function(err) {
+		if (err) throw err;
+		console.log(file);
+            });
+	});
+    });
+});