I fixed it. No bug in GT! Was a fault of myself!!
When I specify new colors for an existing GridCoverage, I create a new
BufferedImage with a corresponding ColorModel and then a new
GridCoverage of the BufferedImage.
And there was a (copy/paste-)bug in the creation of the BufferedImage:
I created it with
BufferedImage bufIm = new BufferedImage(
raster.getHeight(),
raster.getHeight(),
...
)
instead of
BufferedImage bufIm = new BufferedImage(
raster.getWidth(),
raster.getHeight(),
...
)
So my displayed raster was a little bit deformed compared to my original
raster (from which I determined the raster value to the mouse position)!
Sorry for my unnecessary question...
Martin Schmitz
Martin Desruisseaux schrieb:
Martin Schmitz a écrit :
In the vertical direction everything is exactly correct. The problem
is the horizontal.
As I found out just a minute ago, the reason seems not to be the
method GeoMouseEvent.getMapCoordinate(.) because if I move the cursor
in the lower left corner, it returns the correct lat/lon position of
my raster! So the problem must be GridCoverage.evaluate(Point2D,.).
Is there a bug in the transformation from the lat/lon to raster
coordinates? Rounding problems?
Not as far as I know. It seems to work correctly on my own software (but
I may be wrong - more tests would be better). There is no separated
processing for the horizontal and the vertical axis. Most
transformations are handled by java.awt.geom.AffineTransform, which
handle both axis simultaneously. An error may occurs while setting up
the AffineTransform however. I suggest to try the following:
MathTransform tr =
gridCoverage.getGridGeometry().getGridToCoordinateSystem();
System.out.println(tr);
Make sure that the affine transform coefficients are the expected one.
The AffineTransform can be setup by GridCoverage2D at construction time
from the image size and an user-supplied Envelope. Make sure that the
envelope is correct. If the envelope is correct but GridCoverage2D setup
an incorrect AffineTransform, please let me know.
Martin.
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