83 lines
2.7 KiB
Java
83 lines
2.7 KiB
Java
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package ch.epfl.alpano.dem;
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import static java.lang.Math.max;
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import static java.lang.Math.min;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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import ch.epfl.alpano.GeoPoint;
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import static java.lang.Math.toRadians;
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final class DrawHgtDEM {
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final static File HGT_FILE = new File("HGT"+File.separatorChar+"N46E006.hgt");
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final static double ORIGIN_LON = toRadians(6.25);
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final static double ORIGIN_LAT = toRadians(46.25);
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final static double WIDTH = toRadians(0.5);
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final static int IMAGE_SIZE = 300;
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final static double MIN_ELEVATION = 200;
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final static double MAX_ELEVATION = 1_500;
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public static void main(String[] as) throws Exception {
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DiscreteElevationModel dDEM =
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new HgtDiscreteElevationModel(HGT_FILE);
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ContinuousElevationModel cDEM =
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new ContinuousElevationModel(dDEM);
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double step = WIDTH / (IMAGE_SIZE - 1);
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BufferedImage i = new BufferedImage(IMAGE_SIZE,
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IMAGE_SIZE,
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BufferedImage.TYPE_INT_RGB);
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for (int x = 0; x < IMAGE_SIZE; ++x) {
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double lon = ORIGIN_LON + x * step;
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for (int y = 0; y < IMAGE_SIZE; ++y) {
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double lat = ORIGIN_LAT + y * step;
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GeoPoint p = new GeoPoint(lon, lat);
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double el =
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(cDEM.elevationAt(p) - MIN_ELEVATION)
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/ (MAX_ELEVATION - MIN_ELEVATION);
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i.setRGB(x, IMAGE_SIZE - 1 - y, gray(el));
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}
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}
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dDEM.close();
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ImageIO.write(i, "png", new File("tests/ch/epfl/alpano/dem/dem.png"));
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}
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public static void drawDem(ContinuousElevationModel cDem){
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double step = WIDTH / (IMAGE_SIZE - 1);
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BufferedImage i = new BufferedImage(IMAGE_SIZE,
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IMAGE_SIZE,
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BufferedImage.TYPE_INT_RGB);
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for (int x = 0; x < IMAGE_SIZE; ++x) {
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double lon = ORIGIN_LON + x * step;
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for (int y = 0; y < IMAGE_SIZE; ++y) {
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double lat = ORIGIN_LAT + y * step;
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GeoPoint p = new GeoPoint(lon, lat);
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double el =
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(cDem.elevationAt(p) - MIN_ELEVATION)
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/ (MAX_ELEVATION - MIN_ELEVATION);
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i.setRGB(x, IMAGE_SIZE - 1 - y, gray(el));
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}
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}
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try {
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ImageIO.write(i, "png", new File("tests/ch/epfl/alpano/dem/dem.png"));
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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private static int gray(double v) {
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double clampedV = max(0, min(v, 1));
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int gray = (int) (255.9999 * clampedV);
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return (gray << 16) | (gray << 8) | gray;
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}
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}
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