#ifndef GEOMETRY_H

 #define GEOMETRY_H

 #include <QPointF>

 #include <QRectF>

 #include <QPolygonF>

 QRectF addBBox(QRectF r1, QRectF r2);

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

 QPointF normalize (const QPointF &p);

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

 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