Bummer.
This might be grasping at straws, but does it make any difference if
you use an iterator ?
For example...
RenderedImage rImg = cov.getRenderedImage();
TiledImage tImg = new TiledImage(rImg, true);
WritableRectIter iter = RectIterFactory.createWritable(tImg, null);
float c = (float)100;
for (int y = tImg.getMinY(); y <= tImg.getMaxY(); y++) {
for (int x = tImg.getMinX(); x <= tImg.getMaxX(); x++) {
iter.setSample(c);
}
iter.nextLine();
iter.startPixels();
}
Michael
> for (int numXtiles=0; numXtiles<tImg .getNumXTiles(); numXtiles++){
> for (int numYtiles=0; numYtiles<tImg .getNumYTiles(); numYtiles++){
> WritableRaster wr = tImg.getWritableTile(numXtiles, numYtiles);
> for (int yy=0; yy<wr.getHeight(); yy++){
> for (int xx=0; xx<wr.getWidth(); xx++){
> wr.setSample(wr.getMinX()+xx, wr.getMinY()+yy,
> 0, c);
> }
> }
> tImg.releaseWritableTile(numXtiles, numYtiles);
> }
> }
2008/9/28 Oleg72 <[EMAIL PROTECTED]>:
>
> Unfortunately it does not work
> I tried:
> RenderedImage rImg = cov.getRenderedImage();
> TiledImage tImg = new TiledImage(rImg, true);
> float c = (float)100;
> for (int numXtiles=0; numXtiles<tImg .getNumXTiles(); numXtiles++){
> for (int numYtiles=0; numYtiles<tImg .getNumYTiles(); numYtiles++){
> WritableRaster wr = tImg.getWritableTile(numXtiles, numYtiles);
> for (int yy=0; yy<wr.getHeight(); yy++){
> for (int xx=0; xx<wr.getWidth(); xx++){
> wr.setSample(wr.getMinX()+xx, wr.getMinY()+yy,
> 0, c);
> }
> }
> tImg.releaseWritableTile(numXtiles, numYtiles);
> }
> }
>
> On the loop 1880 program is terminated with the following error:
> "Exception in thread "main" java.lang.RuntimeException: Cannot construct
> DataBuffer."
>
>
>
> Michael Bedward wrote:
>>
>> try this...
>>
>> RenderedImage rImg = cov.getRenderedImage();
>> TiledImage tImg = new TiledImage(rImg, true);
>>
>> then work with the TiledImage which, in effect, is a writable view of
>> your coverage's raster
>>
>> Caveat: I haven't done this with really large coverages.
>>
>> Let us know how you go.
>>
>> Michael
>>
>> 2008/9/27 Oleg72 <[EMAIL PROTECTED]>:
>>>
>>> Dear All,
>>> I am trying to read and edit large ESRI Ascii Grid.
>>> To edit small grids the following works fine:
>>> (WritableRaster)RenderedImage().getData();
>>>
>>> Unfortunately this approach does not work with large Grids.
>>> * Is there a way to make GridCoverage2D created from large ascii Grid
>>> editable?
>>>
>>> At the moment the only way to solve this problem is to create new
>>> GridCoverage2D using GridCoverageBuilder and copy data (floating) into
>>> it.
>>> The only problem at the moment is to define number of digits after
>>> decimal
>>> point.
>>> If I am writing value 0.001 and reading it back I am getting 0.0 same
>>> problem with saving grid to file.
>>> * How do I define the number of decimal places for values stored in
>>> GridCoverage2D?
>>> Any help would be highly appreciated.
>>> Oleg
>>> --
>>> View this message in context:
>>> http://www.nabble.com/WritableRaster-and-GridCoverageBuilder-tp19690976p19690976.html
>>> Sent from the geotools-gt2-users mailing list archive at Nabble.com.
>>>
>>>
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>
> --
> View this message in context:
> http://www.nabble.com/WritableRaster-and-GridCoverageBuilder-tp19690976p19704613.html
> Sent from the geotools-gt2-users mailing list archive at Nabble.com.
>
>
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