/* Written by Nick Exner on 7/22/98                        *
 * Free to distribute                                      */
/***********************************************************
 * Modified by Michael McKelvey                            *
 * 3/25/02                                                 *
 * Fixed repainting issue-now it only shows the triples    *
 *  when the calculate button is pressed, not when the     *
 *  number of triples is selected from the drop-down menu  *
 ***********************************************************/

import java.applet.Applet;
import java.awt.*;

public class prime extends Applet
{
	boolean statusNum = false, showStats = false;
	int xpos=55, ypos=300, numTrials=10;

	int upto=1000;
	TextArea ta = new TextArea("Ready...",15,40);
	String line;
	StringBuffer buf = new StringBuffer();

	int num1=0,
		 num2=0,
		 xpos1=5,
		 ypos1=105,
		 success=0,
		 failure=0;

	public void init()
	{
		setBackground(new Color(180,180,255));
		Choice d= new Choice();

		d.addItem("10");
		d.addItem("50");
		d.addItem("100");
		d.addItem("500");
		d.addItem("1000");
		d.addItem("5000");
		d.addItem("10000");
		d.addItem("50000");

		add(new Label("Select Number of Trials: "));
		add(d);
		add(new Button("Calculate"));
		add(ta);
	}

	public void paint(Graphics g)
	{
		g.setColor(Color.lightGray);
		g.drawRect(xpos-3,ypos-13,175,40);
		g.setColor(Color.white);
		g.fillRect(xpos-4,ypos-14,175,40);

		g.setColor(Color.black);
		g.drawRect(xpos-5,ypos-15,175,40);
		g.drawRect(xpos-4,ypos-14,175,40);

		g.drawString("Success #",xpos,ypos);
		g.drawString("Fail #",xpos+70,ypos);	
		g.drawString("Ratio",xpos+120,ypos);

		if (statusNum)
		{
			num1=0;
			num2=0;
			xpos1=5;
			ypos1=105;
			success=0;
			failure=0;
			buf.append(numTrials + " trials:\n\n");
			
			for(int i=1;i <= numTrials; i++)
			{
				num1=(int)(Math.random()*upto);
				num2=(int)(Math.random()*upto);

				if (tryRelative(num1,num2))
				{
					buf.append("("+num1+" , "+num2+")*");
					success++;

					if (i%2==0 && i>0) 
						buf.append("\n");
					else
					{
						if (num1>99 && num2 > 99)
							buf.append("      ");
						else	if (num1>9 && num2 > 9)
							buf.append("        ");
						else
							buf.append("          ");
					}
				}
				else
				{
					buf.append("("+num1+" , "+num2+")");
					failure++;
					if (i%2==0 && i>0) 
						buf.append("\n");
					else if (num1>99 && num2 > 99)
						buf.append("        ");
					else 	if (num1>9 && num2 > 9)
						buf.append("          ");
					else
						buf.append("           ");	
				}
			}
			ta.setText(buf.toString());
			buf = new StringBuffer();

			statusNum = false;
		} // statusNum

		if(showStats)
		{
			g.drawString(""+success,xpos,ypos+15);

			g.drawString(""+failure,xpos+70,ypos+15);

			if (success > failure)
			{
				g.drawString(""+roundDouble((1.0*failure/success),2),xpos+120,ypos+15);
				g.drawString("-/+",xpos+151,ypos);
			}
			else
			{
				g.drawString(""+roundDouble((1.0*success/failure),2),xpos+120,ypos+15);	
				g.drawString("+/-",xpos+151,ypos);
			}
		}
	} // Paint

	public boolean tryRelative(int a, int b)
	{
		for (int i=2; i<((a<b) ? (a-1) : (b-1));i++)
			if (a%i==0 && b%i==0)
				return false;
		return true;
	}

	public boolean action(Event evt, Object arg)
	{
		if (evt.target instanceof Choice)
		{
			numTrials=(Integer.parseInt((String)arg));
			statusNum = false;
			ta.setText("Ready...");
			showStats = false;
		}
		else if (evt.target instanceof Button)
		{
			statusNum = true;
			ta.setText("Calculating...");
			showStats = true;
		}
		repaint();
		return true;
	}

	public double roundDouble(double x, int place)
	{
		double times=1.0;
		for (int j=0;j<place;j++)
			times=times*10;
		return (Math.round(x*times)/times);
	}

	public Insets insets()
	{
		return new Insets(0,0,0,0);
	}

} // End class Prime