package ch.epfl.alpano.dem;

import static java.awt.image.BufferedImage.TYPE_INT_RGB;
import static java.lang.Math.*;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import ch.epfl.alpano.*;

import javax.imageio.ImageIO;

public final class TestWavyDEM {
  @SuppressWarnings("resource")
  public static void main(String[] args)
    throws IOException {

    DiscreteElevationModel dDEM1 =
      new WavyDEM(new Interval2D(new Interval1D(0, 50),
                                 new Interval1D(0, 100)));
    DiscreteElevationModel dDEM2 =
      new WavyDEM(new Interval2D(new Interval1D(50, 100),
                                 new Interval1D(0, 100)));
    DiscreteElevationModel dDEM =
      dDEM1.union(dDEM2);
    ContinuousElevationModel cDEM =
      new ContinuousElevationModel(dDEM);

    int size = 300;
    double scale = (100d / 3600d) / (size - 1);
    BufferedImage elI =
      new BufferedImage(size, size, TYPE_INT_RGB);
    BufferedImage slI =
      new BufferedImage(size, size, TYPE_INT_RGB);
    for (int x = 0; x < size; ++x) {
      for (int y = 0; y < size; ++y) {
        GeoPoint p = new GeoPoint(toRadians(x * scale),
                                  toRadians(y * scale));
        double el = cDEM.elevationAt(p);
        elI.setRGB(x, y, gray(el / 1000d));

        double sl = cDEM.slopeAt(p);
        slI.setRGB(x, y, gray(sl / (PI / 2d)));
      }
    }

    ImageIO.write(elI, "png", new File("tests/ch/epfl/alpano/dem/elevation.png"));
    ImageIO.write(slI, "png", new File("tests/ch/epfl/alpano/dem/slope.png"));
  }

  private static int gray(double v) {
    double clampedV = max(0, min(v, 1));
    int gray = (int) (255.9999 * clampedV);
    return (gray << 16) | (gray << 8) | gray;
  }
}