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

/** Czech Republic - this time we need slanted lines.
 */
public class Flag3
{
  public static void main(String [] args)
  {
    // First, create an image object.
    // The parameters to the constructor are: 
    //   width, height, and image type (we use 1)
    BufferedImage image = new BufferedImage (300,200,1);

    // Second, write pixel values into the image.
    // For values x from 0 to 149:
    //   Use white for y = 0 to (2/3)x.
    //   Use blue for y = (2/3)x to 200-(2/3)x
    //   Use red for y = 200-(2/3) to 199.
    // For values of x from 150 to 299:
    //   Use white for y = 0 to 99.
    //   Use red for y = 100 to 199.

    // I should take the color definitions out of the loop.
    int blueNumber  =   0*65536 +   0*256 + 255;
    int whiteNumber = 255*65536 + 255*256 + 255;
    int redNumber   = 255*65536 +   0*256 +   0;

    for (int x = 0; x < 150; ++x)
    {
      // white
      for (int y = 0; y < 2*x/3; ++y)
        image.setRGB(x, y, whiteNumber);

      // blue
      for (int y = 2*x/3; y < 200 - 2*x/3; ++y)
        image.setRGB(x, y, blueNumber);

      // red
      for (int y = 200 - 2*x/3; y < 200; ++y)
        image.setRGB(x, y, redNumber);
    }

    for (int x = 150; x < 300; ++x)
    {
      // white
      for (int y = 0; y < 100; ++y)
        image.setRGB(x, y, whiteNumber);

      // red
      for (int y = 100; y < 200; ++y)
        image.setRGB(x, y, redNumber);
    }

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