Re: [Geotools-gt2-users] Bug in StreamingRenderer.java (geotool 2.3)

[Simone G. <sim...@gm...>]

Ciao Gabriella,
I tried to reproduce the erroneous behaviour you are experiencing with
no luck, everything seems to work. I have to point out that I am not
using 2.3.M0 but the source of what is about the become 2.3-RC1.

Here is the code I am using:

                                //
/////////////////////////////////////////////////////////////////
//
// CREATING A GRID COVERAGE
//
//
// /////////////////////////////////////////////////////////////////
final RenderedImage image = ImageIO.read(TestData.getResource(this,
FILENAME));
final GeneralEnvelope myEnvelope = new GeneralEnvelope(
new Rectangle2D.Double(35, -41, 45, 46));
GridCoverageFactory factory = FactoryFinder
.getGridCoverageFactory(null);
GridCoverage2D gc = factory.create("Map", image, myEnvelope);

// /////////////////////////////////////////////////////////////////
//
// MAP CONTEXT
//
//
// /////////////////////////////////////////////////////////////////
final MapContext context = new DefaultMapContext(
DefaultGeographicCRS.WGS84);
StyleBuilder sb = new StyleBuilder();
RasterSymbolizer rs = sb.createRasterSymbolizer();

final Style style = sb.createStyle(rs);
context.addLayer(gc, style);

// /////////////////////////////////////////////////////////////////
//
// Streaming renderer
//
//
// ///////////////////////////////////////////////////////////////
final StreamingRenderer renderer = new StreamingRenderer();
renderer.setContext(context);

RendererBaseTest.showRender("testGridCoverage", renderer, 1000, context
.getLayerBounds());

This code works fine for me.

Now, I understand you are trying to visualize some georeferenced image
(image+world file). Here you have a couple of suggestions.
1>Always use an appropriate prj file otherwise the plugin for world
images will send a warning to the output and use WGS84 geographic.
2>Use the code that I am providing here below:



// /////////////////////////////////////////////////////////////////
//
// CREATING A GRID COVERAGE
//
//
// /////////////////////////////////////////////////////////////////
WorldImageReader wr = new WorldImageReader(TestData
.file(this, FILENAME));
// /////////////////////////////////////////////////////////////////
//
// MAP CONTEXT
//
//
// /////////////////////////////////////////////////////////////////
final MapContext context = new DefaultMapContext(
DefaultGeographicCRS.WGS84);
StyleBuilder sb = new StyleBuilder();
RasterSymbolizer rs = sb.createRasterSymbolizer();

final Style style = sb.createStyle(rs);
context.addLayer(wr, style);

// /////////////////////////////////////////////////////////////////
//
// Streaming renderer
//
//
// ///////////////////////////////////////////////////////////////
final StreamingRenderer renderer = new StreamingRenderer();
renderer.setContext(context);


The good news about 2.3.x is that you can pass directly a reader to
the renderer so that the the best fitting image will be chose in order
to increase speed and reduce memory usage.
3>Always tell the MapContext which CRS to use.

Try the suggestions I gave you and if you still have problems, please,
 send me privately an isolate test case (code+sample coverage) and I
will do my best to solve this issue.


Regards,
Simone.

On 11/13/06, Gabriella Turek <g....@ni...> wrote:
> I think I found the source of the null point exception:
>
> Nov 13, 2006 2:19:49 PM StreamingRenderer processStylers
> SEVERE: null
> java.lang.NullPointerException
>        at com.vividsolutions.jts.geom.Envelope.init(Envelope.java:254)
>        at com.vividsolutions.jts.geom.Envelope.<init>(Envelope.java:186)
>        at
> org.geotools.geometry.jts.ReferencedEnvelope.<init>(ReferencedEnvelope.ja
> va:112)
>        at
> org.geotools.renderer.lite.gridcoverage2d.GridCoverageRenderer.<init>(Gri
> dCoverageRenderer.java:158)
>        at StreamingRenderer.renderRaster(StreamingRenderer.java:1731)
>        at StreamingRenderer.processSymbolizers(StreamingRenderer.java:1590)
>        at StreamingRenderer.process(StreamingRenderer.java:1534)
>        at StreamingRenderer.processStylers(StreamingRenderer.java:1476)
>        at StreamingRenderer.paint(StreamingRenderer.java:542)
>        at StreamingRenderer.paint(StreamingRenderer.java:406)
>
>
>
> that's been driving me crazy (and others it seems) when trying to plot
> georeferenced  files with geo tools 2.3, when it workd perfectly fine 2.2
>
> Apparently mapExtent is never passed along so that on line 1715 when
>  GridCoverageRenderer is instatiated the mapExtent is null.
> I will try to see how I can fix this, as I *really* would like to use
> 2.3 over 2.2.
> gaby
> --
> ***************************************************************
> **     Gabriella Turek               g....@ni...      **
> ** National Institute of Water & Atmospheric Research (NIWA) **
> ** PO Box 8602 Christchurch New Zealand +64-3-348-8987x3724  **
> ***************************************************************
>
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-- 
-------------------------------------------------------
Eng. Simone Giannecchini
President /CEO GeoSolutions

http://www.geo-solutions.it

-------------------------------------------------------