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LBitmapRgn::SetRgnEllipse

#include "ltwrappr.h"

virtual L_INT LBitmapRgn::SetRgnEllipse(pRect)

Creates or updates the associated class object's bitmap region by adding an elliptical region.

Parameters

LPRECT pRect

Pointer to the windows RECT structure that specifies the bounding rectangle of the elliptical region. You specify the structure using device context coordinates, and LEADTOOLS translates the coordinates using the values set using LBitmapRgn::SetRgnXForm.

Returns

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

Comments

To update an existing region, you specify how the new region is to be combined with the existing one. For descriptions of the possibilities, refer to Creating a Bitmap Region.

The combine mode is set when the LBitmapRgn object is created. Be sure to set the uCombineMode to L_RGN_LEGACY_ELLIPSE if you are working with older versions of LEADTOOLS, you are using [LBitmapRgn:SetRgnEllipse, and you need backwards compatibility.

Required DLLs and Libraries

LTDIS
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

L_INT LBitmapRgn__SetRgnEllipseExample() 
{ 
   L_INT nRet = FAILURE; 
   LBitmapBase MyBitmap(200,300,ORDER_BGR); 
   RECT Rect={10,10,50,200}; 
 
   nRet = MyBitmap.Load(MAKE_IMAGE_PATH(TEXT("image1.cmp"))); 
   if(nRet !=SUCCESS) 
      return nRet; 
   LBitmapRgn Region(&MyBitmap); 
 
   // check if the bitmap region is valid or not 
   if (Region.IsValid() ==FALSE) 
      Region.SetBitmap(&MyBitmap); 
 
   //set the ellipse as a region 
   nRet = Region.SetRgnEllipse(&Rect);  
   if(nRet !=SUCCESS) 
      return nRet; 
 
   //… 
 
   return SUCCESS; 
}