// This program copies pixel data from a file to the screeen.
// It reads 256 by 256 bytes from file pic.data and makes each into a gray pixel.
// C code in mpd.c makes such a file as a test.
import java.awt.*;
import java.awt.image.*;
import java.io.*;
class Main {
    static final int X = 1000, Y = 700;
    static short gs(FileInputStream s) throws IOException, java.io.FileNotFoundException
      {byte x = (byte)s.read(), y = (byte)s.read(); 
           short z = (short)(((0xff&y)|(x<<8)));
           if (z<X) return z; return X-1;}
    static BufferedImage I = new BufferedImage(X, Y, BufferedImage.TYPE_INT_RGB);
    static void pp(FileInputStream is, int col)
      throws java.io.FileNotFoundException, java.io.IOException
       {short x = gs(is), y = gs(is); if(y<Y)
       I.setRGB(x, Y-1-y, col);}
    static public void main( String[] args )
      throws FileNotFoundException, IOException
    {
        FileInputStream is = new FileInputStream("trails");
        Frame f = new Frame( "paint Example" );
        f.add("Center", new MainCanvas());
        f.setSize(new Dimension(X,Y+22));
        try {for(int ww=0; ww<50000; ++ww){
           pp(is, 0x00ffff); pp(is, 0xff00ff); pp(is, 0xffff00);
       }}
        catch(Exception e){System.out.println("ex="+e);
       }f.setVisible(0<1);
    }
}
class MainCanvas extends Canvas
{
    public void paint(Graphics g)
    {
        g.drawImage(Main.I, 0, 0, Color.red, null);
    }
}