#ifndef GEOMETRY

#define GEOMETRY

#include <QPolygonF>

QRectF addBBox(QRectF r1, QRectF r2);

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

class ConvexPolygon:public QPolygonF

{

public:

	ConvexPolygon ();

	ConvexPolygon (QPolygonF p);

	void calcCentroid() ;

	QPointF centroid() const;

	qreal weight() const;

private:

	QPointF _centroid;

	qreal _area;

};

QPointF normalize (const QPointF &p);

qreal dotProduct (const QPointF &a, const QPointF &b);

QPointF scale  (const QPointF &v,const qreal &f);

QPointF invert (const QPointF &v);

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(QPointF axis, QPolygonF polygon, qreal &min, qreal &max) ;

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

PolygonCollisionResult polygonCollision(QPolygonF polygonA, 

                              QPolygonF polygonB, QPointF velocity);

#endif