How much is it rotated? If it is rotated 90 degrees you may have your axis
order in correct (very easy to do!).
For more information check the user manual:
http://docs.geotools.org/latest/userguide/library/referencing/order.html
Jody Garnett
On Sat, Jul 19, 2014 at 6:59 AM, Miguel Figueiredo <ollliega...@gmail.com>
wrote:
> 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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