1 // Created on: 2011-10-11
2 // Created by: Roman KOZLOV
3 // Copyright (c) 2011-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef __IVTK_IVIEW_H__
17 #define __IVTK_IVIEW_H__
19 #include <IVtk_Interface.hxx>
23 #include <Graphic3d_Mat4d.hxx>
25 DEFINE_STANDARD_HANDLE( IVtk_IView, IVtk_Interface )
28 //! @brief Interface for obtaining view transformation parameters.
30 //! These parameters are used by selection algorithm to compute
31 //! projections of selectable (active) 3D shapes.
32 class IVtk_IView : public IVtk_Interface
36 typedef Handle(IVtk_IView) Handle;
39 virtual ~IVtk_IView() { }
41 //! @return true if this is a perspective view, and false otherwise.
42 virtual bool IsPerspective() const = 0;
44 //! @return The focal distance of the view
45 virtual double GetDistance() const = 0;
47 //! @return The world coordinates of the view position
48 virtual void GetPosition (double& theX, double& theY, double& theZ) const = 0;
50 //! @return The "view up" direction of the view
51 virtual void GetViewUp (double& theDx, double& theDy, double& theDz) const = 0;
53 //! @return The projection direction vector of this view
54 virtual void GetDirectionOfProjection (double& theDx,
56 double& theDz) const = 0;
58 //! @return Three doubles contaning scale components of the view transformation
59 virtual void GetScale (double& theX, double& theY, double& theZ) const = 0;
61 //! @return The current view's zoom factor (for parallel projection)
62 virtual double GetParallelScale() const = 0;
64 //! @return The current view angle (for perspective projection)
65 virtual double GetViewAngle() const = 0;
67 //! @return Two doubles containing the display coordinates of the view window center
68 virtual void GetViewCenter (double& theX, double& theY) const = 0;
70 //! Gets window size in screen coordinates in pixels
71 virtual void GetWindowSize (int& theX, int& theY) const = 0;
73 //! Gets camera projection and orientation matrices
74 virtual void GetCamera (Graphic3d_Mat4d& theProj,
75 Graphic3d_Mat4d& theOrient,
76 Standard_Boolean& theIsOrtho) const = 0;
78 //! Converts 3D display coordinates into 3D world coordinates.
79 //! @param [in] theDisplayPnt 2d point of display coordinates
80 //! @param [out] theWorldPnt 3d point of world coordinates
81 //! @return true if conversion was successful, false otherwise
82 virtual bool DisplayToWorld (const gp_XY& theDisplayPnt, gp_XYZ& theWorldPnt) const = 0;
84 //! Gets viewport coordinates
85 virtual void GetViewport (Standard_Real& theX,
87 Standard_Real& theWidth,
88 Standard_Real& theHeight) const = 0;
90 DEFINE_STANDARD_RTTI( IVtk_IView )
93 #endif // __IVTK_IVIEW_H__