kue/circle.h


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#ifndef _CIRCLE_H
#define _CIRCLE_H

#include "point.h"

// Billards and pockets are both circles
// The collison detection code likes to deal with circles, not billards and pockets

class circle : public point {
  public:
	circle(double x, double y, double r) : point(x, y) { _radius = r; }
	~circle() {}

	// Accessors
	double radius() { return _radius; }
	void setRadius(double radius) { _radius = radius; }

	// Returns true if we intersect the other circle
	double intersects(const circle &other_circle) { return (distance(other_circle) - other_circle._radius) <= _radius; }
	// Returns the distance from the edge of this circle to the edge of the other
	double edgeDistance(const circle &other_circle) { return distance(other_circle) - _radius - other_circle._radius; }

  protected:
	double _radius;
};

#endif