vislight.h

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#ifndef vislight_h
#define vislight_h

/*+
________________________________________________________________________

 (C) dGB Beheer B.V.; (LICENSE) http://opendtect.org/OpendTect_license.txt
 Author:        Kristofer Tingdahl
 Date:          4-11-2002
 RCS:           $Id$
________________________________________________________________________


-*/

#include "visbasemod.h"
#include "visdata.h"
#include "visnodestate.h"
#include "visosg.h"


namespace osg
{
    class Light;
 }

namespace visBase
{

mExpClass( visBase ) Light : public NodeState
{
public:
                        Light();
    void                setLightNum(int);
    int                 getLightNum() const;

    void                turnOn(bool n)  { ison_ = n; updateLights(); }
    bool                isOn() const    { return ison_; }

    void                setAmbient(float);
    float               getAmbient() const;

    void                setDiffuse(float);
    float               getDiffuse() const;

    void                setDirection(float x,float y,float z);
    float               direction(int dim) const;
    void                fillPar( IOPar& ) const;
    bool                usePar( const IOPar& );
 

protected:
                                ~Light();
    void                        updateLights();
    void                        initLight();
    bool                        ison_;
    float                       ambient_;
    float                       diffuse_;
    osg::Light*                 light_;

    static const char*  sKeyIsOn();
    static const char*  sKeyAmbient();
    static const char*  sKeyDiffuse();
    static const char*  sKeyLightNum();
    static const char*  sKeyDirection();
private:
    void                        applyAttribute(
                                osg::StateSet*,osg::StateAttribute*);
};


} //visBase

#endif