Ah, thank you very much for the suggestions. I'll give them a shot.
-Tom
On 5/7/07, Martin Schmitz <[EMAIL PROTECTED]> wrote:
Hi Tom,
some time ago, I found out that the raster colorization does not work
when I give labels to my ColorMap-Categories, e.g. you did:
ColorMap map = sb.createColorMap(
new String[] { "1", "2", "3", "4", "5" },
breaks,
colors,
ColorMap.TYPE_RAMP
);
At that time, I did not figure it out exactly and was content to deal
without labels on my Categories.
But today I hit on some strange thing again:
Although using empty Category labels, my GridCoverage2D created by
GridCoverage2D gc = new GridCoverageFactory().create(name, data, env);
does not become colorized. But when I created a dummy-copy of that grid,
the colors became visible!
GridCoverage2D gc = new GridCoverageFactory().create(name, data, env);
GridCoverage2D gc2 = new GridCoverageFactory().create(
"", gc.getRenderedImage(), gc.getEnvelope() );
After debugging some time I figured out, that THE NAME OF THE
GRIDCOVERAGE was the reason of the hole colorization trouble!
I do not know, what the programmer of the RasterSymbolizer stuff thought
when coding the classes, but: To colorize a grid with ColorMap, THE
CATEGORY NAMES MUST BE EXACTLY CORRESPOND TO THE GRID NAME!
So, to cut a long story short:
Although it is not a solution, leaving both - category names and grid
coverage names - empty string, is a appropriate work-around for the grid
colorization problem...
Kind regards
Martin Schmitz
Tom Howe schrieb:
> Hi, I'm trying to use a Raster symbolizer to display some data that I
> extracted from a netcdf file. Here's my code:
>
> StyleBuilder sb = new StyleBuilder();
> double interval = (minMax.getMax() - minMax.getMin()) / 5;
> double min = minMax.getMin();
> ColorBrewer brewer = ColorBrewer.instance();
> brewer.loadPalettes();
> BrewerPalette[] palettes = brewer.getPalettes
> (ColorBrewer.SEQUENTIAL);
> Color[] colors = palettes[1].getColors(5);
> double[] breaks = new double[] { min, min + interval, min +
> 2 * interval, min + 3 * interval,
> min + 4 * interval };
> ColorMap map = sb.createColorMap(new String[] { "1", "2",
> "3", "4", "5" }, breaks, colors,
> ColorMap.TYPE_RAMP);
> Style style = sb.createStyle(sb.createRasterSymbolizer(map,
1));
> MapContext context = new
> DefaultMapContext(set.getCoordAxes().getBoundingBox()
> .getCoordinateReferenceSystem());
> context.setAreaOfInterest (set.getCoordAxes
().getBoundingBox());
> context.addLayer(gridCoverage, style);
> JMapPane mapPane = new JMapPane();
> JFrame jf = new JFrame("MapPane");
> jf.setSize (500, 500);
> jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
> jf.setLayout(new BorderLayout());
> jf.getContentPane().add(mapPane);
> mapPane.setMapArea(context.getAreaOfInterest ());
> GTRenderer renderer = new StreamingRenderer();
> HashMap hints = new HashMap();
> hints.put("memoryPreloadingEnabled", Boolean.TRUE);
> renderer.setRendererHints (hints);
> mapPane.setRenderer(renderer);
> mapPane.setContext(context);
> jf.setVisible(true);
>
> but, the image still comes out as a grayscale. Am I doing something
> wrong or is the color map stuff not supported by streaming renderer or
> something else all together?
>
> Thanks,
> Tom
>
>
> ------------------------------------------------------------------------
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