Note: the following is about the demo there:
http://svn.geotools.org/geotools/trunk/gt/demo/coverage/src/main/java/org/geotools/demo/coverage/FloatRasterDemo.java
Gabriella Turek a écrit :
> How do I make the image layer transparent?
The GridCoverageFactory.create(...) method used in the demo was an other
convenience method, sligthly more elaborated then the one with float[][]
argument. If you need more control, we need to go one other level in the
'create' method (i.e. choose one a little bit less convenient). You need to
create GridSampleDimension explicitly; this is the path that give the maximum
control.
Choose a linear relationship going from your floating point values to some
integer values in the range 1 to 255 inclusive. Lets assume that this linear
relationship is expressed by 'scale' and 'offset' double values. Then (replace
"Temperature" by the actual name of your data; also select a Unit appropriatly.
Note that the Category and SampleDimension name doesn't need to be the same):
Category nodata = Category.NODATA;
Category data = new Category("Temperature", colors, 1, 255, scale, offset);
GridSampleDimension band = new GridSampleDimension("Temperature", new
Category[] {nodata, data}, NonSI.CELSIUS);
GridCoverage2D coverage = GridCoverageFactory.create("Temperature June 1st",
envelope, new GridSampleDimension[] {band});
Martin
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