VectorToRasterProcess fails for point data
------------------------------------------
Key: GEOT-3509
URL: http://jira.codehaus.org/browse/GEOT-3509
Project: GeoTools
Issue Type: Bug
Affects Versions: 2.7.0
Reporter: Michael Bedward
Fix For: 2.7.1, 8-M0
Reported Mike O'Toole on the user list - rasterizing point features always
results in a grid coverage where all cells are zero. The problem is that the
AWT methods used to draw vectors into the backing image only make sense for
polygons and lines.
The following code produced a correct result with Mike's data:
{code}
GridCoverageFactory gcf =
CoverageFactoryFinder.getGridCoverageFactory(null);
WritableRaster raster =
RasterFactory.createBandedRaster(DataBuffer.TYPE_FLOAT, numCols,
numRows, 1, new java.awt.Point(0, 0));
GridCoverage2D cov = gcf.create("mycov", raster, new
ReferencedEnvelope(minx, maxx, miny, maxy, crs));
GridGeometry2D gg = cov.getGridGeometry();
SimpleFeatureIterator iter = collection.features();
try {
while (iter.hasNext()) {
SimpleFeature feature = iter.next();
Geometry p = (Geometry) feature.getDefaultGeometry();
Float value = (Float) feature.getAttribute("value");
Coordinate pcoord = p.getCoordinate();
DirectPosition pos = new DirectPosition2D(pcoord.x, pcoord.y);
GridCoordinates2D gc = gg.worldToGrid(pos);
raster.setSample(gc.x, gc.y, 0, value);
}
} finally {
iter.close();
}
{code}
Put this into VectorToRasterProcess to deal with point data.
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