package Lecture5;

public class SimplePoint2 {
    public static void main(String[] args) {
        SimplePt a= new SimplePt();
        SimplePt b= new SimplePt();
        double xa= a.getX();
        double ya= a.getY();
        System.out.println("a= (" + xa + " , " + ya + ")");
        a.move(-9.0, 7.5);
        System.out.println("a= (" + a.getX() + " , " + a.getY() + ")");
    }
}   

class SimplePt {
    private double r, theta;    // Miembros de datos
    public SimplePt() {  // Constructor
        r= 0.0;
        theta= 0.0; }
    // Métodos    
    public double getX() { return r* Math.cos(theta);}
    public double getY() { return r* Math.sin(theta);}
    public void setX(double xval) { 
        double yval= r*Math.sin(theta);
        r= Math.sqrt(xval*xval + yval*yval);
        theta= Math.atan2(yval, xval); }
    public void setY(double yval) { 
        double xval= r*Math.cos(theta);
        r= Math.sqrt(xval*xval + yval*yval);
        theta= Math.atan2(yval, xval); }
    public void move(double deltaX, double deltaY) {
        double xval= r*Math.cos(theta);
        double yval= r*Math.sin(theta);
        xval += deltaX;
        yval += deltaY;
        r= Math.sqrt(xval*xval + yval*yval);
        theta= Math.atan2(yval, xval); 
    }
}   // Fin de la clase SimplePt