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Thread: help guys.. could you tell me what am i doing wrong?

  1. #1
    Junior Member
    Join Date
    Nov 2010
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    Default help guys.. could you tell me what am i doing wrong?

    i am designing this my circle class

    i. It should contain three private doubles for x, y and radius.
    ii. A constructor that accepts three double parameters for x, y, and radius.
    iii. A constructor that accepts a MyPoint and a radius. This constructor should
    call the constructor in ii.
    iv. A no-arg constructor that creates a circle at (0,0) with radius 1. This
    constructor should call the constructor in iii.
    v. Three get methods for the x, y and radius properties.
    vi. Three set methods for the x, y and radius properties.
    vii. A method named distance that returns the distance (a double) between this
    MyCircle and another MyCircle.
    viii. A method named contains that returns true if and only if the MyCircle
    contains a MyPoint passed as a parameter.
    ix. A method named contains that return true if and only if the MyCircle
    completely contains a MyCircle passed as a parameter.
    x. A toString method.
    xi. A static void main method for testing the MyCircle class


    so far i have this code

    public class MyCircle {
    private double x;
    private double y;
    private double radius;


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

    public MyCircle(MyPoint point, double rad){
    this.x = point.getX();
    this.y = point.getY();
    this.radius = rad;
    }

    public MyCircle(){
    this.x = 0;
    this.y = 0;
    this.radius = 0;
    }

    public double getX(){
    return x;
    }

    public double getY(){
    return y;
    }

    public double getRadius(){
    return radius;
    }

    public void setX(double x){
    this.x = x;
    }

    public void setY(double y){
    this.y = y;
    }

    public void setRadius(double radius){
    this.radius = radius;
    }

    public double distance(MyCircle other){
    double result = 0;

    double tmpX = this.x - other.x;
    double tmpY = this.y - other.y;

    result = Math.sqrt((tmpX*tmpX)*(tmpY*tmpY));


    return result;

    }

    public boolean contains(MyPoint o){
    boolean tmp;
    double result;

    double tmpX = this.x - o.getX();
    double tmpY = this.y - o.getY();
    System.out.println(tmpX);
    System.out.println(o.getX() + " + " + this.x);
    result = Math.sqrt((tmpX*tmpX)*(tmpY*tmpY));
    System.out.println(result);
    if(result < this.radius)
    tmp = true;
    else
    tmp = false;
    return tmp;

    }

    public String toString(){
    return "Point x = " + this.x + "\nPoint y = " +this.y
    + "\nRadius = " +this.radius;
    }



    public static void main(String [] args){

    MyPoint p = new MyPoint(1,4);
    MyCircle c = new MyCircle(p,3);
    System.out.println(c);
    MyCircle x = new MyCircle();
    boolean tmp = x.contains(p);
    System.out.println(tmp);

    }
    }


    and could someone explain the rule ix, thx god bless


  2. #2
    Junior Member
    Join Date
    Feb 2011
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    Default Re: help guys.. could you tell me what am i doing wrong?

    If A and B are circles. B is contained in A if and only if the distance between A and B plus the radius of B is smaller than radius of A.

    make sense? I think so.

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