/**  This is a Supporting Class which has Rho/Theta values in a method to be added
 *   into an ArrayList. Once added, it will calculate the values of
 *   X and Y. Main will then print each of the X/Y values to stdout
 *   and calculate its distances. After Distance has been computed, it will print 
 *   out its values.  
 *    
 *  http://www.mathsisfun.com/polar-cartesian-coordinates.html
 *  http://math.ucsd.edu/~wgarner/math4c/textbook/chapter9/polar_coordinates.htm
 *  http://math.ucsd.edu/~wgarner/math4c/derivations/distance/distancepolar.htm
 *
 * @author Freeman Lo
 * @version 0.0.1 Build 1 Feb 1, 2014.
 * Limitations -  Besides not having try-catch error handling blocks
 * Everything else seem to work pretty well, it is a standalone software 
 * with embedded values in each Cartesian and Polar class. 
 *
 */

import java.util.*;
import java.text.*;

public class Polar {
	private double rho; //  hypothneus
	private double theta; // degree
	
	private List <String> arrList = new ArrayList<String>(); 
	private List <Double> rhoList = new ArrayList<Double>(); 
	private List <Double> thetaList = new ArrayList<Double>();
	private List <Double> dist = new ArrayList<Double>(); 
	
	private DecimalFormat df = new DecimalFormat("####.00000000");
	
	public Polar () {
		arrList = new ArrayList<String>();
		rhoList = new ArrayList<Double>();
		thetaList = new ArrayList<Double>();
		dist = new ArrayList<Double>();
	}

	public List<Double> getRho() {
		return rhoList;
	}
	
	public List<Double> getTheta() {
		return thetaList;
	}
	
	public void addXY(){

		this.arrList.add("86.92 2.47");
		this.arrList.add("70.93 27.81");
		this.arrList.add("97.74 34.36");
		this.arrList.add("30.90 35.14");
		this.arrList.add("51.66 31.70");
		this.arrList.add("0.830 21.77");
		this.arrList.add("55.91 66.62");
		this.arrList.add("32.92 75.23");
		this.arrList.add("65.26 72.53");
		this.arrList.add("83.90 4.710");
	}

	public void printValues() {
		for (int i = 0; i < arrList.size(); i++) { 		// loop through arraylist
		   String item = arrList.get(i);			// grab element from arraylist
		   System.out.println("Item " + i + " : " + item);	// printout its element
		}
	}
	
	public void printRhoThetaValues() {
		for (int i = 0; i < rhoList.size(); i++) {	
		   Double rItem = rhoList.get(i);
		   Double tItem = thetaList.get(i);	
		   System.out.println( i + "\t" + "Rho: " + rItem + "  Theta: " + tItem);
		}
	}
	
	public void printDistanceResults() {
		System.out.println();
		for (int i = 0; i < dist.size(); i++) {			// loop through the distance arraylist
		   String item = df.format(dist.get(i));		// grab dist element in the arraylist
		   System.out.println("Distance " + i + " : " + item);	// print out its values / elements in the dist arraylist
		}
	}
	
	public void calRho() {
		String item = "";
		String [] ele;

		for ( int c=0; c<this.arrList.size(); c++ ){
			item = (String) this.arrList.get(c);
			ele = item.split(" ");	
			this.rho = Double.parseDouble(df.format(Math.hypot(Double.parseDouble(ele[0]),Double.parseDouble(ele[1]))));	
			this.rhoList.add(this.rho);	
		}	
	}

	public void calTheta() {
		String item = "";
		String [] ele;

		for ( int c=0; c<this.arrList.size(); c++ ){
			item = (String) this.arrList.get(c);
			ele = item.split(" ");			
			this.theta = Double.parseDouble(df.format(Math.toDegrees(Math.atan2(Double.parseDouble(ele[1]),Double.parseDouble(ele[0])))));
			this.thetaList.add(this.theta);
		}
	}

	public void calDistance() {
		double result = 0.00;		
		
		for ( int x = 1; x<11; x+=2) {			
			result = Math.sqrt(Math.pow(this.rhoList.get(x-1),2)+ Math.pow(this.rhoList.get(x),2)- 2*this.rhoList.get(x-1)*this.rhoList.get(x)* Math.cos(this.thetaList.get(x-1)-this.thetaList.get(x)));
			this.dist.add(result);	
		}
	}
}