#ifndef GEOMETRY

#define GEOMETRY

#include <QPolygonF>

QRectF addBBox(QRectF r1, QRectF r2);

bool isInBox(const QPointF &p, const QRectF &box);

qreal distance (const QPointF &p, const QPointF &q);

class Vector:public QPointF

{

public:

	Vector ();

	Vector (const QPointF &p);

	Vector (qreal x, qreal y);

	friend inline bool operator==(const Vector &v1, const Vector &v2 )

	{ return v1.x()==v2.x() && v1.y()==v2.y(); }

	bool isNull();

	virtual void normalize ();

	virtual qreal dotProduct (const QPointF &b);

	virtual void scale  (const qreal &f);

	virtual void invert ();

	virtual QPointF toQPointF();

};

class ConvexPolygon:public QPolygonF

{

public:

	ConvexPolygon ();

	ConvexPolygon (QPolygonF p);

	void calcCentroid() ;

	QPointF centroid() const;

	qreal weight() const;

	std::string toStdString ();

	Vector at (const int &i) const ; 

	virtual void translate ( const Vector &offset );

	virtual void translate ( qreal dx, qreal dy );

private:

	Vector _centroid;

	qreal _area;

};

class PolygonCollisionResult {

public:

    // Are the polygons going to intersect forward in time?

    bool willIntersect;

    // Are the polygons currently intersecting?

    bool intersect;

    // The translation to apply to the first polygon to push the polygons apart.

    QPointF minTranslation;

};

void projectPolygon(Vector axis, ConvexPolygon polygon, qreal &min, qreal &max) ;

qreal intervalDistance(qreal minA, qreal maxA, qreal minB, qreal maxB);

PolygonCollisionResult polygonCollision(ConvexPolygon polygonA, 

                              ConvexPolygon polygonB, Vector velocity);

#endif