// This program copies line segment data from a file to a png file.
// Each line segment to be drawn is 4 words, 4 bytes each, in big-endian order.
import java.awt.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
import java.io.*;
class Main {
    static final int X = 700, Y = 700;
    static int gs(FileInputStream s) throws IOException
      {byte x[] = new byte[4]; int c = s.read(x, 0, 4);
      if(c != 4) return -1;
      int r = 0; for(int i=0; i<4; ++i) r = (r<<8) | (0xff&x[i]);
           return r;}
   
    static public void main( String[] args )
      throws FileNotFoundException, IOException
      { FileInputStream is;
        BufferedImage I = new BufferedImage(X, Y, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = I.createGraphics();
        g.setColor(Color.white);
        try{is = new FileInputStream("trnsp");}
        catch(java.io.FileNotFoundException nf){
            System.out.println("No input trnsp."); return;}
        while(true) {
          int x=gs(is);
          if (x < 0) break;
          g.drawLine(x, Y-1-gs(is), gs(is), Y-1-gs(is));}
        try {ImageIO.write(I, "png", new File("cnf.png"));}
        catch (IOException e) {System.err.println("image not saved.");}}}