Hi,
I am loading a tif image to a MapContent and then writing it to a grayscale
png file, but the resulting image is rotated.
I used code from the raster image tutorial, but something is missing or
incorrect.
Can someone help me with the following code?
public class Convert {
private static final String INPUT_FILE = "/tmp/bluemarble.tif";
private static final String OUTPUT_FILE = "/tmp/image.png";
private static StyleFactory sf = CommonFactoryFinder.getStyleFactory();
private static FilterFactory2 ff =
CommonFactoryFinder.getFilterFactory2();
public static void main(String[] args) {
File rasterFile = new File(INPUT_FILE);
AbstractGridFormat format = GridFormatFinder.findFormat(rasterFile);
AbstractGridCoverage2DReader reader = format.getReader(rasterFile);
Style rasterStyle = createGreyscaleStyle(1);
final MapContent map = new MapContent();
Layer rasterLayer = new GridReaderLayer(reader, rasterStyle);
map.addLayer(rasterLayer);
saveImage(map, OUTPUT_FILE, 1000);
}
private static Style createGreyscaleStyle(int band) {
ContrastEnhancement ce = sf.contrastEnhancement(ff.literal(1.0),
ContrastMethod.NORMALIZE);
SelectedChannelType sct =
sf.createSelectedChannelType(String.valueOf(band), ce);
RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
ChannelSelection sel = sf.channelSelection(sct);
sym.setChannelSelection(sel);
return SLD.wrapSymbolizers(sym);
}
public static void saveImage(final MapContent map, final String file,
final int imageWidth) {
GTRenderer renderer = new StreamingRenderer();
renderer.setMapContent(map);
Rectangle imageBounds = null;
ReferencedEnvelope mapBounds = null;
try {
mapBounds = map.getMaxBounds();
double heightToWidth = mapBounds.getSpan(1) /
mapBounds.getSpan(0);
imageBounds = new Rectangle(0, 0, imageWidth, (int)
Math.round(imageWidth
* heightToWidth));
} catch (Exception e) {
throw new RuntimeException(e);
}
BufferedImage image = new BufferedImage(imageBounds.width,
imageBounds.height,
BufferedImage.TYPE_INT_RGB);
Graphics2D gr = image.createGraphics();
gr.setPaint(Color.WHITE);
gr.fill(imageBounds);
try {
renderer.paint(gr, imageBounds, mapBounds);
File fileToSave = new File(file);
ImageIO.write(image, "png", fileToSave);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
<geotools-gt2-users@lists.sourceforge.net>Best regards,
Miguel
--
Miguel Figueiredo
Software Developer
http://jaragua.hopto.org <http://jaragua.dyndns.org>
"I'm a pretty lazy person and am prepared to work quite hard in order to
avoid work."
-- Martin Fowler
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