dragcontroller.h

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#ifndef dragcontroller_h
#define dragcontroller_h

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        J.C. Glas
 Date:          May 2016
________________________________________________________________________

-*/

#include "algomod.h"
#include "coord.h"


mExpClass(Algo) DragController
{
public:
                        DragController();
                        ~DragController();

    void                init(const Coord& mousepos,double scalefactor=1.0,
                             const Coord3& dragdir=Coord3(0.0,0.0,0.0));

    void                setFastMaxDragToMouseRatio(float distanceperpixel);
    float               getFastMaxDragToMouseRatio() const;

    void                setSlowMaxDragToMouseRatio(float distanceperpixel);
    float               getSlowMaxDragToMouseRatio() const;

    void                setFastMinDragToMouseRatio(float distanceperpixel);
    float               getFastMinDragToMouseRatio() const;

    void                setSlowMinDragToMouseRatio(float distanceperpixel);
    float               getSlowMinDragToMouseRatio() const;

    void                setFastMouseSpeed(float pixelspersecond);
    float               getFastMouseSpeed() const;

    void                setSlowMouseSpeed(float pixelspersecond);
    float               getSlowMouseSpeed() const;

    void                setLinearBackDragFrac(float fraction);
    float               getLinearBackDragFrac() const;
    void                transform(double& dragval,const Coord& mousepos,
                                  double maxdragdist=mUdf(double));
    void                transform(Coord3& dragvec,const Coord& mousepos,
                                  double maxdragdist=mUdf(double));

    void                dragInScreenSpace(bool fromstart,const Coord& projvec);

protected:

    void                reInit(const Coord& mousepos);

    void                manageScreenDragging(double& dragval,
                                             const Coord& mousepos);

    double              absTransform(double dragval,const Coord& mousepos,
                                     double maxdragdist=mUdf(double));

    float               fastmaxdragtomouseratio_;
    float               slowmaxdragtomouseratio_;
    float               fastmindragtomouseratio_;
    float               slowmindragtomouseratio_;
    float               fastmousespeed_;
    float               slowmousespeed_;
    float               linearbackdragfrac_;

    Coord               initmousepos_;
    Coord3              dragdir_;
    int                 prevdragtime_;

    bool                screendragmode_;
    float               screendragfactor_;
    Coord               screendragprojvec_;

    Coord               prevmousepos_;
    double              prevdragval_;
    double              prevtransval_;
    double              maxdragval_;
    int                 dragsign_;
    double              scalefactor_;
};


#endif