//GrayScale.java
//random points in gray scale 1-10

import java.awt.*;
import javax.swing.*;

public class GrayScale extends JApplet {     

    int rows, cols, height, width, loops;

    public void init() {

	String input;
	input = JOptionPane.showInputDialog("Enter # rows");
	rows = Integer.parseInt(input);
	input = JOptionPane.showInputDialog("Enter # columns");
	cols = Integer.parseInt(input);
	input = JOptionPane.showInputDialog("Enter row height");
	height = Integer.parseInt(input);
	input = JOptionPane.showInputDialog("Enter column width");
	width = Integer.parseInt(input);
	input = JOptionPane.showInputDialog("Enter # iterations");
	loops = Integer.parseInt(input);
/*	input = JOptionPane.showInputDialog("Random percentage rock");
	percent = Integer.parseInt(input);
	input = JOptionPane.showInputDialog("Pixel scale factor");
	scale = Integer.parseInt(input);
	input = JOptionPane.showInputDialog("Seepage rule:"+
					    "\n1. above or either diagonal"+
					    "\n2. above or both diagonals");
	rule = Integer.parseInt(input);
	sideflow = JOptionPane.showInputDialog("Side flow (yes or no)");
*/
    }

    public void paint (Graphics g) {
	int [][]W = new int[rows][cols];
	int r, c;
	int shades=10;
	Color grays[] = new Color[shades+1];
	for (int i=1; i<=shades; i++)
	    grays[i] = new Color(256-i*25, 256-i*25, 256-i*25);
	    	/*new Color((int)(Math.random()*256),
	                         (int)(Math.random()*256),
	                         (int)(Math.random()*256));
	    	*/
	     
	g.setColor(Color.WHITE);
	g.fillRect(0,0, rows/height,cols/width);

	for (int i=0; i<loops; i++) {
	    r = (int)(Math.random()*rows);
	    c = (int)(Math.random()*cols);
	    W[r][c]++;
	    //showStatus(""+W[r][c]);
	    if (W[r][c] <= shades)
	        g.setColor( grays[W[r][c]] );
	    else
	    	g.setColor( grays[W[shades][shades]]);   //max element
	    if (height==1 && width==1)   //pixels
	        g.drawLine(c,r, c,r);
	    else
	    	g.fillRect(c*width,r*height, width, height);
	}
	showStatus("Done");
    }
}