ArcBallCamera.h

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#ifndef GlobeEngine_ArcBallCamera_h
#define GlobeEngine_ArcBallCamera_h

#include "Camera.h"
#include <vmmlib/quaternion.hpp>

namespace ge {
    
#define Epsilon 1.0e-5
    
    class ArcBallCamera : public Camera
    {
    public:
        ArcBallCamera();
        ~ArcBallCamera();
        void clear();
        void create() {};
        void create(float _width, float _height,ViewFrustumProperties _in, vmml::Vector3d _pos);
        
        //Set new bounds
        inline void setBounds(vmml::Vector2d _viewport)
        {
            //Set adjustment factor for width/height
            this->adjustWidth = 1.0f / ((_viewport.x() - 1.0f) * 0.5f);
            this->adjustHeight = 1.0f / ((_viewport.y() - 1.0f) * 0.5f);
        }
        
        vmml::Vector3d mapToSphere(const vmml::Vector2d NewPt);
        vmml::Quaterniond calculateRotationQuat();
        vmml::Matrix4d setRotationFromQuaternion(vmml::Quaterniond q1);
        
        void update();
        void setClicked(bool _in);
        void setZooming(bool _in);
        void setMousePointer(float _x, float _y);
            
        void setPanning(bool _in);
        void resetPanning();

        void setCenter(vmml::Vector3d);

        vmml::Vector3d getCenter();

        void resetZoom();
        void setZoomFactorLimit(double _radius);


protected:
        void calculateViewMatrix();

        vmml::Quaterniond rot_quat;
        vmml::Vector3d lastVec;
        vmml::Vector3d activeVec;

        vmml::Matrix4d activeRot;
        vmml::Matrix4d lastRot;
        vmml::Matrix4d zoomMatrix;
        vmml::Vector2d activePan;
        vmml::Vector2d lastPan;

        vmml::Matrix4d trans;
        vmml::Vector3d center;

        double adjustWidth;    //Mouse bounds width
        double adjustHeight;   //Mouse bounds height
        
        bool isRotating;
        bool isDragging;
        bool isPanning;

        double zoomfactor;
        
        vmml::Vector2d MousePt;
        vmml::Vector2d firstMousePt;
        vmml::Vector3d initPos;

        float zoomFactorLimit;
    };
}
#endif