ILookEx Interface
- ScreenTo3D
- ProjectToScreen
- ScreenTo3DEx
- ScreenToEyeFrame
This interface allows mapping between the screen coordinates and 3D global
coordinates of the correspondent point on the Viewing Plane.
ILookEx can be queried from the correspondent IView interface.
See also Interface List
HRESULT ScreenTo3D( int xWnd, int yWnd, DIPoint *pPt )
Parameters
xWnd, yWnd- [in] - coordinates of the point
in pixels relative to the upper left corner of the display window.
pPt - [out] - Correspondent 3D point
on the Viewing Plane. Coordinates of pPt are relative the
global frame.
Returns
- S_OK in case of
success.
- Remarks:
This method allows mapping between the screen coordinates and 3D global
coordinates of the correspondent point on the Viewing Plane. Coordinates of
pPt are relative to the global frame. Normally xWnd, yWnd are
coordinates of a point in pixels, which are supplied in a handler for a windows
mouse action message like mouse down, mouse move, or mouse up messages.
HRESULT ProjectToScreen( DIPoint pt, int *pxWnd, int *pyWnd)
Parameters
pt - [in] 3D point in global
coordinates.
pxWnd, pyWnd - [out] - mapped window
coordinates in pixels of projection of pt to the Viewing Plane.
Return Values
- S_OK in case of success.
-
- Remarks:
For any 3D point pt in space the method will find projection if pt to
the Viewing Plane and will return windows
coordinates of its mapping to the computer screen.
HRESULT ScreenTo3DEx( int xWnd, int yWnd, double dist, DIPoint *pPt )
Parameters
xWnd, yWnd- [in] - coordinates of the point
in pixels relative to the upper left corner of the display window.
pPt - [out] - Correspondent 3D point. Coordinates of pPt are relative the
global frame.
dist - [in] Required distance from the Viewing Plane.
Returns
- S_OK in case of
success.
- Remarks:
This method calculates point in 3D space, which is translation of point
identical to one returned by ScreenTo3D above by dist along
positive direction of normal to the Viewing Plane,
which can be called line of view. There is no need to call ScreenTo3D prior
this method. Call to this method with dist = 0.0 will return the same point as ScreenTo3D.
HRESULT ScreenToEyeFrame(int xWnd, int yWnd, double* x, double* y)
Returns point in View plane (x,y palne of eye frame), which corresponds to the specified window point.
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