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LVectorBase::GetViewport

Summary

Gets the current view port.

Syntax

#include "ltwrappr.h"

virtual L_INT LVectorBase::GetViewport(pViewport)

Parameters

RECT *pViewport

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

Returns

Value	Meaning
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 double buffer mode is selected.

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

Required DLLs and Libraries

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

Example

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; 
}