Examples with ImageRenderer org.apache.sis.coverage.grid.ImageRenderer used on opensource projects

Example 1 with ImageRenderer

use of org.apache.sis.coverage.grid.ImageRenderer in project sis by apache.

the class RenderingData method ensureImageLoaded.

/**
 * Fetches the rendered image if {@linkplain #data} is null. This method needs to be invoked at least
 * once after {@link #setCoverageSpace(GridGeometry, List)}. The {@code coverage} given in argument
 * may be the value returned by {@link #ensureCoverageLoaded(LinearTransform, DirectPosition)}.
 *
 * @param  coverage     the coverage from which to read data, or {@code null} if the coverage did not changed.
 * @param  sliceExtent  a subspace of the grid coverage extent where all dimensions except two have a size of 1 cell.
 *         May be {@code null} if this grid coverage has only two dimensions with a size greater than 1 cell.
 * @return whether the {@linkpalin #data} changed.
 * @throws FactoryException if the CRS changed but the transform from old to new CRS can not be determined.
 * @throws TransformException if an error occurred while transforming coordinates from old to new CRS.
 */
public final boolean ensureImageLoaded(GridCoverage coverage, final GridExtent sliceExtent) throws FactoryException, TransformException {
    if (data != null || coverage == null) {
        return false;
    }
    coverage = coverage.forConvertedValues(true);
    final GridGeometry old = dataGeometry;
    final List<SampleDimension> ranges = coverage.getSampleDimensions();
    final RenderedImage image = coverage.render(sliceExtent);
    final Object value = image.getProperty(PlanarImage.GRID_GEOMETRY_KEY);
    final GridGeometry domain = (value instanceof GridGeometry) ? (GridGeometry) value : new ImageRenderer(coverage, sliceExtent).getImageGeometry(BIDIMENSIONAL);
    setCoverageSpace(domain, ranges);
    data = image;
    /*
         * Update the transforms in a way that preserve the current zoom level, translation, etc.
         * We compute the change in the "data grid to objective CRS" transforms caused by the change
         * in data grid geometry, then we concatenate that change to the existing transforms.
         * That way, the objective CRS is kept unchanged.
         */
    if (old != null && cornerToObjective != null && objectiveToCenter != null) {
        MathTransform toNew = null, toOld = null;
        if (old.isDefined(GridGeometry.CRS) && domain.isDefined(GridGeometry.CRS)) {
            final CoordinateReferenceSystem oldCRS = old.getCoordinateReferenceSystem();
            final CoordinateReferenceSystem newCRS = dataGeometry.getCoordinateReferenceSystem();
            if (newCRS != oldCRS) {
                // Quick check for the vast majority of cases.
                /*
                     * Transform computed below should always be the identity transform,
                     * but we check anyway as a safety. A non-identity transform would be
                     * a pyramid where the CRS changes according the pyramid level.
                     */
                final GeographicBoundingBox areaOfInterest = Extents.union(dataGeometry.getGeographicExtent().orElse(null), old.getGeographicExtent().orElse(null));
                toNew = CRS.findOperation(oldCRS, newCRS, areaOfInterest).getMathTransform();
                toOld = toNew.inverse();
            }
        }
        final MathTransform forward = concatenate(PixelInCell.CELL_CORNER, dataGeometry, old, toOld);
        final MathTransform inverse = concatenate(PixelInCell.CELL_CENTER, old, dataGeometry, toNew);
        cornerToObjective = MathTransforms.concatenate(forward, cornerToObjective);
        objectiveToCenter = MathTransforms.concatenate(objectiveToCenter, inverse);
    }
    return true;
}

Example 2 with ImageRenderer

use of org.apache.sis.coverage.grid.ImageRenderer in project sis by apache.

the class Raster method render.

/**
 * Returns a two-dimensional slice of grid data as a rendered image.
 * This returns a view as much as possible; sample values are not copied.
 */
@Override
public RenderedImage render(final GridExtent target) {
    final ImageRenderer renderer = new ImageRenderer(this, target);
    try {
        renderer.setData(data);
        if (bandOffsets != null) {
            renderer.setInterleavedPixelOffsets(pixelStride, bandOffsets);
        }
        if (colors != null) {
            renderer.setCategoryColors(colors);
        }
        renderer.setVisibleBand(visibleBand);
        return renderer.createImage();
    } catch (IllegalArgumentException | ArithmeticException | RasterFormatException e) {
        throw new RuntimeException(Resources.format(Resources.Keys.CanNotRender_2, label, e), e);
    }
}