import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;

/** Can we try the UK (Union jack) ?
 */
public class Flag4
{
  public static void main(String [] args)
  {
    // First, create an image object.
    // We need 600 by 300.
    BufferedImage image = new BufferedImage (600,300,1);

    // Second, write pixel values into the image.
    // 1.  paint everything blue.
    // 2.  fill in diagonals.  (hardest part)
    // 3.  fill in horizontal and vertical stripes.
    // Note that it's ok to overwrite pixel values like this.

    int blueNumber  =   0*65536 +   0*256 + 140;
    int whiteNumber = 255*65536 + 255*256 + 255;
    int redNumber   = 255*65536 +   0*256 +   0;

    // everything blue
    for (int x = 0; x < 600; ++x)
      for (int y = 0; y < 300; ++y)
        image.setRGB(x, y, blueNumber);

    // Diagonals!
    // Left half of flag:  (values of x from 0 to 299)
    //   white from y = (1/2)x - 30 to y = (1/2)x:  beware bounds!
    //   red from y = (1/2)x to y = (1/2)x + 20
    //   white from y = (1/2)x + 20 to y = (1/2)x + 30
    //
    //   white from y = (-1/2)x + 270 to y = (-1/2)x + 300
    //   red from y = (-1/2)x + 300 to y = (-1/2)x + 320):  beware bounds
    //   white from y = (-1/2)x + 320 to y = (-1/2)x + 330: beware bounds
    //
    // Right half of flag:  (values of x from 300 to 599)
    //   white from y = (-1/2)x + 270 to y = (-1/2)x + 280:  beware bounds
    //   red from y = (-1/2)x + 280 to y = (-1/2)x + 300:  beware bounds
    //   white from y = (-1/2)x + 300 to y = (-1/2)x + 330
    //
    //   white from y = (1/2)x - 30 to y = (1/2)x - 20
    //   red from y = (1/2)x - 20 to y = (1/2)x
    //   white from y = (1/2)x to y = (1/2)x + 30:  beware bounds

    for (int x = 0; x < 300; ++x)
    {
      for (int y = x/2 - 30; y < x/2; ++y)
      {
        if (y < 0)
          continue;
        image.setRGB(x, y, whiteNumber);
      }
      for (int y = x/2; y < x/2 + 20; ++y)
        image.setRGB(x, y, redNumber);
      for (int y = x/2 + 20; y < x/2 + 30; ++y)
        image.setRGB(x, y, whiteNumber);

      for (int y = -x/2 + 270; y < -x/2 + 300; ++y)
        image.setRGB(x, y, whiteNumber);
      for (int y = -x/2 + 300; y < -x/2 + 320; ++y)
      {
        if (y >= 300)
          continue;
        image.setRGB(x, y, redNumber);
      }
      for (int y = -x/2 + 320; y < -x/2 + 330; ++y)
      {
        if (y >= 300)
          continue;
        image.setRGB(x, y, whiteNumber);
      }
    }

    // right half of flag
    for (int x = 300; x < 600; ++x)
    {
      for (int y = -x/2 + 270; y < -x/2 + 280; ++y)
      {
        if (y < 0)
          continue;
        image.setRGB(x, y, whiteNumber);
      }
      for (int y = -x/2 + 280; y < -x/2 + 300; ++y)
      {
        if (y < 0)
          continue;
        image.setRGB(x, y, redNumber);
      }
      for (int y = -x/2 + 300; y < -x/2 + 330; ++y)
        image.setRGB(x, y, whiteNumber);

      for (int y = x/2 - 30; y < x/2 - 20; ++y)
        image.setRGB(x, y, whiteNumber);
      for (int y = x/2 - 20; y < x/2; ++y)
        image.setRGB(x, y, redNumber);
      for (int y = x/2; y < x/2 + 30; ++y)
      {
        if (y >= 300)
          continue;
        image.setRGB(x, y, whiteNumber);
      }
    }

    // Horizontal and vertical
    // So far, so good!  This is what we need to finish.  :)
    // White horizontal stripe first:
    for (int x = 0; x < 600; ++x)
      for (int y = 100; y < 200; ++y)
        image.setRGB(x, y, whiteNumber);

    // white vertical
    for (int x = 250; x < 350; ++x)
      for (int y = 0; y < 300; ++y)
        image.setRGB(x, y, whiteNumber);

    // red horizontal
    for (int x = 0; x < 600; ++x)
      for (int y = 120; y < 180; ++y)
        image.setRGB(x, y, redNumber);

    // red vertical
    for (int x = 270; x < 330; ++x)
      for (int y = 0; y < 300; ++y)
        image.setRGB(x, y, redNumber);
    

    // Third, write the image to a file.  
    // May automatically throw "IOException"
    try
    {
      ImageIO.write(image, "png", new File ("uk.png"));
    }
    catch (IOException e)
    {
      System.out.printf("Encountered problem trying to write to file\n");
    }
  }
}