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Re: Programming question determining two circle's relation

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On Apr 30, 5:33 pm, byhesed <byhe...@gmail.com> wrote:
> What's wrong with contains and overlaps method in Circle2D class?
> It returns incorrect answers.
>
> - A method contains(double x, double y) returns true if the specified
> point(x,y) is inside this circle.
> - A method contains(Circle2D circle) returns true if the specified
> circle is inside this circle.
> - A method overlaps(Circle2D circle) return true if the specified
> circle overlaps with this circle.
>
> I calculate the distance between two circles:
> - double distance = Math.sqrt(Math.pow(circle.x - getX(), 2.0) +
> Math.pow(circle.y - getY(), 2.0));
>
> It's wired too me because I think it is not wrong.
>
> // TEST CODE
> public class Exercise10_11 {
>         public static void main(String[] args) {
>                 Circle2D c1 = new Circle2D(2, 2, 5.5);
>                 System.out.println("Area is " + c1.getArea());
>                 System.out.println("Perimeter is " + c1.getPerimeter());
>                 System.out.println(c1.contains(3, 3));
>                 System.out.println(c1.contains(new Circle2D(4, 5, 10.5)));
>                 System.out.println(c1.overlaps(new Circle2D(3, 5, 2.3)));
>         }
>
> }
>
> // Circle2D Class
> public class Circle2D {
>         private double x;
>         private double y;
>         private double radius;
>
>         public Circle2D() {
>                 x = 0;
>                 y = 0;
>                 radius = 1;
>         }
>
>         public Circle2D(double x, double y, double radius) {
>                 this.x = x;
>                 this.y = y;
>                 this.radius = radius;
>         }
>
>         public double getX() {
>                 return x;
>         }
>
>         public double getY() {
>                 return y;
>         }
>
>         public double getArea() {
>                 return radius * radius * Math.PI;
>         }
>
>         public double getPerimeter() {
>                 return 2 * radius * Math.PI;
>         }
>
>         public boolean contains(double x, double y) {
>                 double distance = Math.pow(getX() - x, 2.0) + Math.pow(getY() - y,
> 2.0);
>                 if (distance <= radius)
>                         return true;
>                 else
>                         return false;
>         }
>
>         public boolean contains(Circle2D circle) {
>                 double distance = Math.sqrt(Math.pow(circle.x - getX(), 2.0) +
> Math.pow(circle.y - getY(), 2.0));
>                 if (distance <= Math.abs(radius - circle.radius))
>                         return true;
>                 else
>                         return false;
>
>         }
>
>         public boolean overlaps(Circle2D circle) {
>                 double distance = Math.sqrt(Math.pow(circle.x - getX(), 2.0) +
> Math.pow(circle.y - getY(), 2.0));
>                 if (distance > Math.abs(radius - circle.radius) && distance <
> Math.abs(radius + circle.radius))
>                         return true;
>                 else
>                         return false;
>         }
>
>
>
>
>
>
>
> }

Sorry, I found answers. Formulas were wrong. :)

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Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 01:33 -0700
  Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 01:59 -0700
    Re: Programming question determining two circle's relation "Gavino" <invalid@invalid.invalid> - 2011-04-30 17:51 +0200
      Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 09:01 -0700
        Re: Programming question determining two circle's relation "Gavino" <invalid@invalid.invalid> - 2011-04-30 18:33 +0200
    Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 02:03 -0700
  Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 02:50 -0700
    Re: Programming question determining two circle's relation byhesed <byhesed@gmail.com> - 2011-04-30 08:42 -0700
      Re: Programming question determining two circle's relation "Gavino" <invalid@invalid.invalid> - 2011-04-30 17:59 +0200
    Re: Programming question determining two circle's relation "John B. Matthews" <nospam@nospam.invalid> - 2011-04-30 17:25 -0400
      Re: Programming question determining two circle's relation Patricia Shanahan <pats@acm.org> - 2011-04-30 17:03 -0700
        Re: Programming question determining two circle's relation "John B. Matthews" <nospam@nospam.invalid> - 2011-05-01 03:10 -0400
  Re: Programming question determining two circle's relation Patricia Shanahan <pats@acm.org> - 2011-04-30 02:08 -0700
  Re: Programming question determining two circle's relation Roedy Green <see_website@mindprod.com.invalid> - 2011-04-30 11:49 -0700

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