viewpt3d.hxx

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#ifndef INCLUDED_SVX_VIEWPT3D_HXX
#define INCLUDED_SVX_VIEWPT3D_HXX

#include <svx/svxdllapi.h>
#include <basegfx/matrix/b3dhommatrix.hxx>
#include <basegfx/point/b3dpoint.hxx>
#include <basegfx/vector/b3dvector.hxx>
#include <tools/gen.hxx>

// predefines
namespace basegfx { class B3DRange; } // end of namespace basegfx

/*************************************************************************
|*
|* enums for projection
|*
\************************************************************************/

enum class ProjectionType { Parallel, Perspective };


/*************************************************************************
|*
|* 3D viewport according to PHIGS
|*
\************************************************************************/

class SVXCORE_DLLPUBLIC Viewport3D
{
 protected:
    basegfx::B3DHomMatrix       aViewTf;        // the real transformations matrix
    basegfx::B3DPoint           aVRP;           // View Reference Point
    basegfx::B3DVector          aVPN;           // View Plane Normal
    basegfx::B3DVector          aVUV;           // View Up Vector
    basegfx::B3DPoint           aPRP;           // Projection Reference Point(View-coordinates)
                                                // up to now only the z-coordinate is considered

    ProjectionType  eProjection;    // kind of the projection
    tools::Rectangle aDeviceRect;          // position and size of the output area

    struct
    {
        double X, Y, W, H;          // position and size of the view window
    } aViewWin;                     // in view coordinates

    basegfx::B3DPoint       aViewPoint;     //observers position in world coordinates;
                                    // is calculated by the transformation
    bool            bTfValid;       // flag, if transformation is valid

 public:
    Viewport3D();

    void SetVRP(const basegfx::B3DPoint& rNewVRP);
    void SetVPN(const basegfx::B3DVector& rNewVPN);
    void SetVUV(const basegfx::B3DVector& rNewVUV);
    void SetPRP(const basegfx::B3DPoint& rNewPRP);

    const basegfx::B3DPoint&    GetVRP() const  { return aVRP; }
    const basegfx::B3DVector&   GetVUV() const  { return aVUV; }

    void SetProjection(ProjectionType ePrj)
        { eProjection = ePrj; bTfValid = false; }
    ProjectionType GetProjection() const { return eProjection; }

    void SetViewWindow(double fX, double fY, double fW, double fH);

    void SetDeviceWindow(const tools::Rectangle& rRect);
    const tools::Rectangle& GetDeviceWindow() const { return aDeviceRect; }

    // returns observers position in world coordinates
    const basegfx::B3DPoint&    GetViewPoint();
};

#endif // INCLUDED_SVX_VIEWPT3D_HXX

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