L_CreateZoomView

#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.

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; 
}

Help Version 19.0.2017.10.27

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LEADTOOLS Raster Imaging C API Help

Introduction

Version History

Getting Started

LEADTOOLS Raster Imaging Features

Redistributables/Files To Be Included With Your Application

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