L_CreateZoomView

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#include "l_bitmap.h"

L_LTZMV_API L_INT L_CreateZoomView(hWnd, pBitmap, pZoomViewProps)

HWND hWnd;	/* handle to a window */
pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
pZOOMVIEWPROPS pZoomViewProps;	/* pointer to a structure */

Creates a new Zoom View and associates it with the specified window.

Parameter	Description
hWnd	Handle to a window.
pBitmap	Pointer to the bitmap handle that references the bitmap displayed in hWnd.
pZoomViewProps	Pointer to a ZOOMVIEWPROPS structure containing options for controlling the behavior of the Zoom View.

Returns

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

Comments

Starts a Zoom View procedure by attaching a zoomed view to the specified window.

Note:

Anytime the window's size changes or the bitmap changes, call the L_UpdateZoomView function in order to update the zoomed view settings.

When the zoomed view is no longer needed, call the L_DestroyZoomView function to stop the specified Zoom View procedure and to detach it from the window handle.

Required DLLs and Libraries

LTZMV

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

Platforms

Win32, x64.

See Also

Functions:	L_WindowHasZoomView, L_GetZoomViewProps, L_UpdateZoomView, L_DestroyZoomView, L_GetZoomViewsCount
Topics:	Using the Zoom View
	Raster Image Functions: Displaying Images
	Using the Magnifying Glass

Example

This sample shows how you can start and stop the Zoom View. It also demonstrates how to provide a callback function and how this can help you to update Zoom View options.

 L_INT CreateZoomViewExample(HDC           hMemDC,
                                            HWND          hWnd,
                                            pBITMAPHANDLE pBitmap,
                                            RECT        * prcView)
{

   ZOOMVIEWPROPS ZoomViewProps;
   L_INT nRet;
   memset(&ZoomViewProps,0,sizeof(ZOOMVIEWPROPS));
   ZoomViewProps.uStructSize = sizeof(ZOOMVIEWPROPS);

   SetRect(&ZoomViewProps.rcSrc, 0, 0, 100* 100, 100* 100);
   SetRect(&ZoomViewProps.rcDst, 100* 100, 100* 100, 200* 100, 200* 100);

   ZoomViewProps.nZoom                = 200;
   ZoomViewProps.bForceDst            = FALSE;
   ZoomViewProps.bEnabled             = TRUE;

   ZoomViewProps.bCallouts            = TRUE;
   ZoomViewProps.crCallout            = RGB(255,0,0);
   ZoomViewProps.nCalloutPenStyle     = PS_DASH;

   ZoomViewProps.crZoomViewBorder     = RGB(0,255,0);
   ZoomViewProps.uZoomViewBorderStyle = ZOOMVIEWBORDERSTYLE_SIMPLE;
   ZoomViewProps.nZoomViewPenStyle    = PS_SOLID;

   ZoomViewProps.crSrcBorder          = RGB(0,0,255);
   ZoomViewProps.uSrcBorderStyle      = SOURCEBORDERSTYLE_SIMPLE;
   ZoomViewProps.nSrcPenStyle         = PS_DOT;

   CopyRect(&ZoomViewProps.rcView, prcView);
   
   nRet = L_CreateZoomView (hWnd, pBitmap, &ZoomViewProps);
   if(nRet == SUCCESS)
   {
      HDC hDC = GetDC(hWnd);
      L_RenderZoomView(hDC,hWnd);
      ReleaseDC(hWnd, hDC);
   }
   else
   {
      return nRet;
   }

   nRet = L_RenderZoomView(hMemDC,hWnd);
   if(nRet != SUCCESS)
      return nRet;

   return SUCCESS;
}