LVectorBase::GetViewport

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#include "ltwrappr.h"

virtual L_INT LVectorBase::GetViewport(pViewport)

RECT *pViewport;

/* pointer to a structure */

Gets the current view port.

Parameter	Description
pViewport	Pointer to a RECT structure to be updated with the current view port data.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

Use this function to get the view port associated with the vector handle.

If the vector is attached to a window, you must call this function when processing WM_SIZE messages, since the VECTOR library needs to know when the window size has changed (DirectX), or when the double buffer mode is selected in the current VECTOR engine.

This function and LVectorBase::SetCamera are required to complete the projection process from the vector image onto a 2D surface.

Required DLLs and Libraries

LVKRN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LVectorBase::SetViewport, LVectorBase::SetPan, LVectorBase::GetPan
Topics:	Viewing a Vector Images
	Vector Images: Viewing a Vector Image

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LVectorBase__GetViewportExample(HWND hWnd)
{
   L_INT    nRet;
   RECT     viewportRect;
   L_TCHAR  szTemp[100];
   LVectorBase Vector;
   nRet = Vector.Load(MAKE_IMAGE_PATH(TEXT("random.dxf")));
   if(nRet != SUCCESS)
      return nRet;
   nRet = Vector.GetViewport(&viewportRect);
   if(nRet != SUCCESS)
      return nRet;
   wsprintf(szTemp, 
            TEXT("Old View Port (%d,%d) (%d,%d)"), 
            viewportRect.left,
            viewportRect.top,
            viewportRect.right,
            viewportRect.bottom);
   MessageBox(hWnd, szTemp, TEXT(""), MB_OK);
   viewportRect.left = 0;
   viewportRect.top = 0;
   viewportRect.right = 200;
   viewportRect.bottom = 200;
   nRet = Vector.SetViewport(&viewportRect);
   if(nRet != SUCCESS)
      return nRet;
   wsprintf(szTemp, 
            TEXT("New View Port (%d,%d) (%d,%d)"), 
            viewportRect.left,
            viewportRect.top,
            viewportRect.right,
            viewportRect.bottom);
   MessageBox(hWnd, szTemp, TEXT(""), MB_OK);
   return SUCCESS;
}