include/svx/e3dsceneupdater.hxx

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  19
  20 #ifndef INCLUDED_SVX_E3DSCENEUPDATER_HXX
  21 #define INCLUDED_SVX_E3DSCENEUPDATER_HXX
  22
  23 #include <svx/svxdllapi.h>
  24
  25 class SdrObject;
  26 class E3dScene;
  27
  28 namespace drawinglayer { namespace geometry {
  29     class ViewInformation3D;
  30 }}
  31
  32 /** Helper for 3d object changes affecting 2d geometry
  33
  34    This class is a helper to encapsulate 3D object changes which shall
  35    change the scene's 2D geometry. E.g. when moving one 3D object in a
  36    scene, the visualisation would not change since the scene's 2D
  37    attributes are defined by its 2D object transformation and the
  38    changed content would be projected to the same 2D bounds as
  39    before. To reflect the fact that the 2D positions may 'change' for
  40    the user's imagination, it is necessary to calculate a new 2D
  41    object transformation of the scene (the SnapRect) using the old 3D
  42    transformation stack and the possibly modified 3D content and to
  43    use it. This is only desirable if changes to the scene's content
  44    are intended to change the scene's 2D geometry attributes
  45 */
  46 class SVX_DLLPUBLIC E3DModifySceneSnapRectUpdater
  47 {
  48     // the scene which may be changed. This gets set to the outmost scene
  49     // of the to-be-changed 3D object when the scene has a 3d transformation
  50     // stack at construction time. In all other cases it's set to zero and
  51     // no action needs to be taken
  52     E3dScene*                                   mpScene;
  53
  54     // the 3d transformation stack at the time of construction, valid when
  55     // mpScene is not zero
  56     drawinglayer::geometry::ViewInformation3D*  mpViewInformation3D;
  57
  58 public:
  59     // the constructor evaluates and sets the members at construction time
  60     E3DModifySceneSnapRectUpdater(const SdrObject* pObject);
  61
  62     // the destructor will take action if mpScene is not zero and modify the
  63     // 2D geomeztry of the target scene
  64     ~E3DModifySceneSnapRectUpdater();
  65 };
  66
  67 #endif // INCLUDED_SVX_E3DSCENEUPDATER_HXX
  68
  69 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */