public class Circle extends GeometricFigure implements Calculate {

private double ratio;

private Dot center;

public Circle(int x, int y, double ratio, String color){

super(color);

this.center = new Dot(x, y);

this.ratio = ratio;

}

@Override

public boolean compare(GeometricFigure fig) {

Circle c = (Circle) fig; //casting

return this.center.equals(c.center) &&

this.ratio == c.ratio &&

this.getColor().equals(c.getColor());

}

@Override

public double area() {

//A = π * r2

return Math.PI * this.ratio*this.ratio;

}

@Override

public double perimeter() {

//P = 2π * r

return 2*Math.PI * (this.ratio);

}

public boolean intersection (Circle c){

//If the distance of circle centers are lower than the sum of the ratios, then it areoverlapping

double centerDistance = this.center.distance(c.center);

return centerDistance <= this.ratio + c.ratio;

}

}