Examples with RectIter javax.media.jai.iterator.RectIter used on opensource projects

Example 1 with RectIter

use of javax.media.jai.iterator.RectIter in project imageio-ext by geosolutions-it.

the class AsciiGridsImageWriter method writeRaster.

/**
 * Write the raster to file.
 *
 * @throws IOException
 */
private void writeRaster() throws IOException {
    // we need to cobble rasters of the same row together in order to
    // respect the way our writer works.
    final RectIter iterator = RectIterFactory.create(inputRenderedImage, null);
    // writing
    final Double noDataDouble = new Double(rasterWriter.getNoData());
    final String noDataMarker = rasterWriter.getNoDataMarker();
    rasterWriter.writeRaster(iterator, noDataDouble, noDataMarker);
}

Example 2 with RectIter

use of javax.media.jai.iterator.RectIter in project polymap4-core by Polymap4.

the class PredefinedColorMap method minMax3.

/**
 * @return double[] {min, max, novalue}
 */
protected double[] minMax3(GridCoverage2D grid, IProgressMonitor monitor) {
    @SuppressWarnings("hiding") double // see OmsRasterReader
    novalue = -9999.0;
    double min = Double.POSITIVE_INFINITY;
    double max = Double.NEGATIVE_INFINITY;
    RenderedImage renderedImage = grid.getRenderedImage();
    monitor.beginTask("calculating min/max", renderedImage.getHeight());
    RectIter iter = RectIterFactory.create(renderedImage, null);
    Timer timer = new Timer();
    int sampleCount = 0;
    do {
        do {
            double value = iter.getSampleDouble();
            if (value == novalue) {
                continue;
            }
            if (value < novalue) {
                throw new IllegalStateException("XXX value < novalue : " + value);
            }
            if (value < min) {
                min = value;
            }
            if (value > max) {
                max = value;
            }
            sampleCount++;
        } while (!iter.nextPixelDone());
        iter.startPixels();
        monitor.worked(1);
    // monitor.subTask( String.valueOf( sampleCount ) );
    } while (// http://github.com/Polymap4/polymap4-core/issues/108 will be better/faster
    !iter.nextLineDone() && timer.elapsedTime() < 5000);
    monitor.done();
    log.info("minMax(): " + sampleCount + " samples in " + timer.elapsedTime() + "ms");
    // XXX check novalue
    return new double[] { min, max, novalue };
}