/*File: DiceGIF.java */
import java.awt.*;
import java.applet.*;
import java.net.*;
import gjt.Util;
/**
* Main Dice Applet class   			
* @author Charles S. Stanton			
* @version 11/19/96			
*/	
public class DiceGIF extends Applet {
	ControlPanelGIF felt2	;
	DiceCanvasGIF felt1;
	drawHistogram  felt3;
	int ndice = 1;			//number of dice
	int xbins = ndice*5+1;
	int xcount[] = new int[xbins]; 
		 //note that this depends on number of dice!
	double[] theoreticalCount=new double[xbins]; 
		    //total_nrolls*p(x), where p(x) is theoretical value
	int die[]= new int[ndice];
	int total_nrolls=0;
	DiceGIF applet=this;
	// Probabilities are hard coded in
	int[][] probs = {{1,1,1,1,1,1},{1,2,3,4,5,6,5,4,3,2,1},
	{1, 3, 6, 10, 15, 21, 25, 27, 27, 25, 21, 15, 10, 6, 3, 1},
	{1, 4, 10, 20, 35, 56, 80, 104, 125, 140, 146, 140, 125,
 	104, 80, 10, 56, 35, 20, 4, 1},
	{1, 5, 15, 35, 70, 126, 205, 305, 420, 540, 651, 735, 780, 
	780,  735, 651, 540, 420, 305, 205, 126, 70, 35, 15, 5, 1},
	{1, 6, 21, 56, 126, 252, 456, 756, 1161, 1666, 2247, 2856, 3431, 
	3906, 4221,   4332,4221, 3906, 3431, 2856, 
	2247, 1666, 1161, 756, 456, 252, 126, 56, 21, 6, 1},
	{1, 7, 28, 84, 210, 462, 917, 1667, 2807, 4417, 6538, 9142, 
	 12117, 15267, 18327, 20993, 22967, 24017, 24017, 22967, 20993, 
	18327, 15267, 12117, 9142, 6538, 4417, 2807, 1667, 917, 
	462, 210, 84, 28, 7, 1},
	{1, 8, 36, 120, 330, 792, 1708, 3368, 6147, 10480, 
	16808,  25488, 36688, 50288, 65808, 82384, 98813, 113688, 
	125588, 133288, 135954, 133288, 125588, 113688, 98813,
	 82384, 65808, 50288, 36688, 25488, 16808, 10480, 6147, 
	3368, 1708, 792, 330, 120, 36, 8, 1},
	{1, 9, 45, 165, 495, 1287, 2994, 6354, 12465, 22825, 
	 39303, 63999, 98979, 145899,205560, 277464, 359469, 447669, 536569, 
	619569, 689715, 740619, 767394, 767394, 740619, 689715, 
	619569, 536569, 447669, 359469, 277464, 205560, 145899, 
	98979, 63999, 39303, 22825, 12465, 6354, 2994, 1287, 
	495, 165, 45, 9, 1}};
	Image[] Dicegif = new Image[6];
	int  imageWidth , imageHeight;
	Graphics offscreenGraphics;
	Image offscreenImage;


	
	public void init() {
		String diegif;
		int k;
			setLayout(new GridLayout(1,3));
		felt1 = new  DiceCanvasGIF(die,ndice,applet, Dicegif);
		//felt1.pleaseWait();
		for (int j=0; j< 6 ; j++) {
			k=j+1;
			diegif = "die"+k+".gif";
			System.out.println(diegif);
			Dicegif[j] = getImage(getCodeBase(),diegif);
			Util.waitForImage(this,Dicegif[j]);}

		felt2 = new ControlPanelGIF(applet);
		felt3 = new drawHistogram(xcount,xbins, theoreticalCount, applet);
		felt1.setBackground(new Color(0,140,0));
	  	felt3.setBackground(new Color(0,0,140));
		add(felt1);
		add(felt2);
		add(felt3);
	}




	public void paint(Graphics g){	
		felt1.paint(g);
		}



/**
 * rollem simulates the rolling of dice using random number  
 * generators.							
 * @param nrolls is the number of rolls to do.
 */
	public void rollem(int nrolls) {
		int sumX;
				for (int j=0; j< nrolls; j++){
			sumX=0;
			for (int i=0; i< ndice; i++) {
			this.die[i]=(int)Math.floor(1+Math.random()*6);
			sumX += die[i];
			}
		felt1.update(die, sumX);
		xcount[sumX-ndice]++;
		felt3.update(xcount);
		felt2.update();
		}
		total_nrolls += nrolls;
		for (int i=0; i< xbins; i++){	
		 theoreticalCount[i] = (double)total_nrolls*
			probs[ndice-1][i]*Math.pow(6.0,-1*ndice);
			}
		}  
	
	public void clear() {
				ndice = Integer.valueOf(felt2.ndice_cbg.getCurrent().getLabel()).intValue();
		xbins = ndice*5+1;
		xcount = new int[xbins];  //note that this depends on number of dice!
		theoreticalCount= new double[xbins];
		total_nrolls=0;
		die = new int[ndice];
		felt1.clearCanvas(ndice);
		felt3.clearHistogram(xcount,xbins,theoreticalCount);
		}


}