[Geotools-gt2-users] GridCoverage2D with LiteRenderer?

[Martin S. <sp...@mo...>]

Hello,

I'm working with combined display of raster and geometry data.
Until now I used GT2.1.M3 with the StyledMapPane, creating a 
RenderedGridCoverage from my GridCoverage and put it directly into the 
Renderer (received by StyledMapPane.getRenderer()). The geometries with 
RenderedGeometries as well.

Because of different reasons (e.g. update problems after the grid 
changed, MapContext did not support Grids) I now want to switch to 
version 2.1.M5.
Unfortunately the StyledMapPane isn's supported in this version anymore 
and trying to integrate the old 2.1.M3-StyledMapPane (from 'migrate' 
package) failed because of 
CoordinateSystem/CoordinateReferenceSystem-collisions in 
StyledMapRenderer.setMapContext(MapContext).

So I tried to manage it without StyledMapPane:
In an former email I read something about LiteRenderer and I tried the 
following (it's a combination of the GT-tutorial-sections "Maps and 
styles > RendererLite" and "Maps and styles > Putting everything together"):

   import java.awt.Graphics2D;
   import java.awt.Color;
   import java.awt.geom.AffineTransform;
   import javax.swing.JPanel;
   import org.geotools.coverage.grid.GridCoverage2D;
   import org.geotools.map.MapContext;
   import org.geotools.map.DefaultMapContext;
   import org.geotools.renderer.lite.LiteRenderer;
   import org.geotools.styling.StyleBuilder;
   import org.geotools.styling.ColorMap;
   import org.geotools.styling.RasterSymbolizer;
   import org.geotools.styling.Style;

   ...

   JPanel         mapPanel     = ... // create an JPanel in a JFrame
   GridCoverage2D gridCoverage = ... // import the raster data which
                                     // contains only int-values from
                                     // 0 to 5

   MapContext     mapContext   = new DefaultMapContext();
   LiteRenderer   renderer     = new LiteRenderer(mapContext);

   // create a style for the grid
   StyleBuilder   styleBuilder = new StyleBuilder();
   ColorMap       cm           = styleBuilder.createColorMap(
     new double[] {0,1,2,3,4,5},
     new Color[]  {Color.WHITE,Color.BLUE,Color.RED,Color.YELLOW,
                   Color.GREEN,Color.WHITE},
     ColorMap.TYPE_VALUES
   );
   RasterSymbolizer symb = styleBuilder.createRasterSymbolizer(cm,1);
   Style style = styleBuilder.createStyle(symb);

   // adding the grid and showing it
   mapContext.addLayer(gridCoverage,style);
   renderer.paint(
     (Graphics2D)mapPanel.getGraphics(),
     mapPanel.getBounds(),
     new AffineTransform()
   );


But nothing is displayed. What's wrong?

The finest solution - in my opinion - is to re-integrate the 
StyledMapPane in version 2.1.M5. I think it is an fantastic class!! :-)

Thanks for help

Martin