/**
 * Draw two circles.  One has an area of Pi (3.1415...) 
 * and the other has an area of 4.  Place random points 
 * in the circles to determin Pi.
 * 
 * @author (Neil) 
 * @version (9/15/08)
 */
 
import java.util.Random;
import javax.swing.JOptionPane;
import java.lang.String;
import java.util.Scanner;
 
public class PiFinder
{
    public static void main(String[] args)
    {
        Turtle sam = new Turtle();      // Create an object that can draw
 
        Random rand1 = new Random();    // Random objects for later, used to 
        Random rand2 = new Random();    // randomize points in circles.
 
        int angle = 0;          // Stores the angle that the Turtle rotated
        double distance = 0;  // Stores the distance traveled by the Turtle
 
        int numInside = 0;    // Number of points in the inner circle
        int numOutside = 0;   // Number of points in the outter part of the bigger circle
 
        String pointsToDraw = JOptionPane.showInputDialog(null, "How many points would you like to place?");
 
        int pointsUser = Integer.parseInt( pointsToDraw );  // The number that the user chaose
        int pointsPlaced = numInside + numOutside;          // The total number of points placed so far
 
        sam.swingAround (100);    // Create the circle that has an area of Pi (for this, 100 = 1)
        sam.swingAround ((4/3.141592654)*100);  // Create the circle with an area of 4 (for this, 400 = 4) (the math is approx. 127.323)
 
        while(pointsPlaced != pointsUser)
        {
            angle = rand1.nextInt(361);     // Store the angle turned
            distance = rand2.nextInt(127);  // Store the distance moved
 
            sam.move(angle, distance);
 
            if( distance < 100)
            {
                numInside = numInside+1;
                sam.switchTo(Turtle.RED);       // Change color to red to distinguish sections
            }
            else
            {
                numOutside = numOutside+1;
                sam.switchTo(Turtle.BLUE);      // Change color to blue to distinguish sections
            }
 
            if(numOutside>1)  // So you don't get:  someNumber/0
            {
                double pi = (numInside/numOutside);
 
                System.out.println("In: "+numInside+".  " + "Out: " +numOutside+".   " +"Pi equals: " +pi);
            }
 
            sam.paint(0,0);    // Paint a dot in current location
            sam.move(180, distance);    // Turn around, move to starting position
            sam.move(-1*angle+180, 0);  // Turn to face left
            sam.sleep(10);     // Pause for 10 milliseconds
 
            pointsPlaced = numInside + numOutside;          // The total number of points placed so far
        }
 
    }
}