// Point class in Java
// Original code by Sofie Hon and John Morris
//
import java.lang.Math.*;

public class Point {
	private double x,y;

	private static double eps = 1.0e8;	

	public Point( double x, double y ){
		this.x = x;
		this.y = y;
		}


	public Point PointRT( double r, double theta ) {
		Point p = new Point( r*java.lang.Math.cos( theta ), 
                  r*java.lang.Math.sin( theta ) );
		return p;
		}
		

	public Point CopyPoint( ) {
		Point p1 = new Point( x, y );
		return p1;
		}


	public double XCoord( ) {
  		 return x;
  		}


	public double YCoord( ) {
  		return y;
 		}


	public double RPolar( ) {
  		return java.lang.Math.sqrt( x*x + y*y );
  		}


	public double TPolar( ) {
   		if ( java.lang.Math.abs(y) < eps ) {
    			return 0.0;
    			}
  		else {
    		if ( java.lang.Math.abs(x) < eps ) {
      			return java.lang.Math.PI/2.0;
      			}
    		}  
  		return java.lang.Math.atan2( y, x );
  		}

	public double Dist( Point p2 ) {
			double dx, dy, d;
  		dx = x - p2.x;
			dy = y - p2.y;
  		d = java.lang.Math.sqrt( dx*dx + dy*dy );
			return d;
			}


//Wat abt these:
//assert
//#define eps  1.0e-8
//#define abs(x)  (((x)>=0.0)?(x):(-(x)))

	// Make a point the same as p1
	public void SetPoint2(  Point p1 ) {
		this.x = p1.x;
		this.y = p1.y;
		}

	// Change a point's attributes
	public void SetPoint( double x, double y ) {
		this.x = x;
		this.y = y;
		}

	// Displace p by delta: p := p+delta */
	public void Displace( Point delta ) {
  	x = x + delta.x;
  	y = y + delta.y;
		}
  
	// Direction (radians) from p1 to p2 */
	public double Direction( Point p2 ) {
  	double t;
		t = java.lang.Math.atan2( p2.y - y, p2.x - x );
		return t;
		}

	public String PointToString ( ) {
	//	fprintf( stderr, "%s (%6.2f,%6.2f)", s, p->x, p->y ); fflush( stderr );
		return new String( "(" + x + "," + y + ")" );
  	}

	}