include/svx/e3dsceneupdater.hxx

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  19
  20 #ifndef _E3D_SCENEUPDATER_HXX
  21 #define _E3D_SCENEUPDATER_HXX
  22
  23 #include <svx/svxdllapi.h>
  24
  25 //////////////////////////////////////////////////////////////////////////////
  26 // predeclarations
  27
  28 class SdrObject;
  29 class E3dScene;
  30 namespace drawinglayer { namespace geometry {
  31     class ViewInformation3D;
  32 }}
  33
  34 //////////////////////////////////////////////////////////////////////////////
  35 // This class is a helper to encapsulate 3D object changes which shall change the
  36 // scene's 2D geometry. E.g. when moving one 3D object in a scene, the visualisation
  37 // would not change since the scene's 2D attributes are defined by it's 2D object
  38 // transformation and the changed content would be projected to the same 2D bounds
  39 // as before. To reflect the fact that the 2D positions may 'change' for the user's
  40 // imagination, it is necessary to calculate a new 2D object transformation of the scene
  41 // (the SnapRect) using the old 3D transformation stack and the eventually changed
  42 // 3D content and tu use it. This is only wanted if changes to the scene's
  43 // content are intended to change the scene's 2D geometry attributes
  44
  45 class SVX_DLLPUBLIC E3DModifySceneSnapRectUpdater
  46 {
  47     // the scene which may be changed. This gets set to the outmost scene
  48     // of the to-be-changed 3D object when the scene has a 3d transformation
  49     // stack at construction time. In all other cases it's set to zero and
  50     // no action needs to be taken
  51     E3dScene*                                   mpScene;
  52
  53     // the 3d transformation stack at the time of construction, valid when
  54     // mpScene is not zero
  55     drawinglayer::geometry::ViewInformation3D*  mpViewInformation3D;
  56
  57 public:
  58     // the constructor evaluates and sets the members at construction time
  59     E3DModifySceneSnapRectUpdater(const SdrObject* pObject);
  60
  61     // the destructor will take action if mpScene is not zero and modify the
  62     // 2D geomeztry of the target scene
  63     ~E3DModifySceneSnapRectUpdater();
  64 };
  65
  66 #endif          // _E3D_SCENEUPDATER_HXX
  67
  68 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */