Examples with ImageData ol.ImageData used on opensource projects

Example 1 with ImageData

use of ol.ImageData in project gwt-ol3 by TDesjardins.

the class RasterExample method getRasterSource.

private static Raster getRasterSource(Source source, RasterOperationType type) {
    // wrap source with raster source layer
    RasterOptions rasterOptions = OLFactory.createRasterOptionsWithSource(source);
    rasterOptions.setOperationType(type);
    RasterOperation<?> rasterOperation = null;
    switch(type) {
        case PIXEL:
            rasterOperation = (PixelColor[] pixels) -> {
                final int channel = 0;
                final int threshold = 245;
                // get pixel of first source
                PixelColor pixel = pixels[0];
                // extract pixel value and apply operation
                int value = pixel.getChannel(channel);
                pixel.clear();
                if (value > threshold) {
                    pixel.setChannel(channel, 255);
                    pixel.setAlpha(128);
                }
                return pixel;
            };
            break;
        case IMAGE:
            rasterOperation = (ImageData[] sourceImages) -> {
                // get image of first source
                ImageData image = sourceImages[0];
                // apply image wide operation, make the lower part of the image darker
                final int width = image.width;
                final int height = image.height;
                PixelColor pixel = new PixelColor(0, 0, 0, 128);
                for (int y = height / 2; y < height; ++y) {
                    for (int x = 0; x < width; ++x) {
                        image.putPixel(x, y, pixel);
                    }
                }
                return image;
            };
            break;
    }
    // set raster operation and return raster
    rasterOptions.setOperation(rasterOperation);
    return new Raster(rasterOptions);
}