#include "l_bitmap.h"

L_LTDIS_API L_INT L_SetBitmapRgnCurve(pBitmap, pXForm, pCurve, uCombineMode)


pointer to the bitmap handle


pointer to a coordinate-translation structure

pCURVE pCurve;

pointer to a structure

L_UINT uCombineMode;

action to take regarding the existing region

Creates or updates the bitmap region by adding a curved region.




Pointer to the bitmap handle referencing the bitmap where the region is to be created or updated.


Pointer to an RGNXFORM structure that LEADTOOLS uses to translate between display coordinates and bitmap coordinates.


If you specify NULL in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the bitmap's view perspective.


Pointer to the CURVE structure that specifies the curve region. You specify the structure using device context coordinates, and LEADTOOLS translates the coordinates using the values specified in the pXForm parameter.


Flag that indicates the action to take regarding the existing bitmap region, if one is defined. For descriptions of the possible values, refer to Creating a Bitmap Region.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


Before calling this function, declare an RGNXFORM structure and set its values, which LEADTOOLS uses to translate between device context coordinates and bitmap coordinates. For details about how the structure works refer to the RGNXFORM structure description. For a description of common usage, refer to Translating Coordinates for a Bitmap Region.

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

Required DLLs and Libraries


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


Win32, x64.

See Also


L_SetBitmapRgnColor, L_SetBitmapRgnEllipse, L_SetBitmapRgnPolygon, L_SetBitmapRgnRect, L_SetBitmapRgnRoundRect, L_SetBitmapRgnColorHSVRange, L_SetBitmapRgnColorRGBRange


Raster Image Functions: Creating and Using a Region


Raster Image Functions: Region Processing


Creating a Bitmap Region


Working with the Existing Bitmap Region


Saving a Region


This sample creates a smooth region that goes through five points, and inverts the region.

L_INT  SetBitmapRgnCurveExample(pBITMAPHANDLE    pBitmap) 
   L_INT nRet; 
   CURVE Curve; 
   POINT points[5]; 
   //Define the points of the curve 
   points[0].x = 30; 
   points[0].y = 30; 
   points[1].x = 30; 
   points[1].y = 200; 
   points[2].x = 130; 
   points[2].y = 130; 
   points[3].x = 75; 
   points[3].y = 75; 
   points[4].x = 130; 
   points[4].y = 30; 
   Curve.uStructSize = sizeof(CURVE); 
   Curve.nType       = CURVE_STANDARD; 
   Curve.nPointCount = 5; 
   Curve.pPoints     = points; 
   Curve.uFillMode   = L_POLY_WINDING; 
   Curve.dTension    = 0.5; 
   Curve.nClose      = CURVE_CLOSE; 
   Curve.nReserved   = 0; 
   nRet = L_SetBitmapRgnCurve(pBitmap, NULL, &Curve, L_RGN_SET); 
   if(nRet != SUCCESS) 
      return nRet; 
   //Do something with the region 
   nRet = L_InvertBitmap(pBitmap, 0); 
   if(nRet != SUCCESS) 
      return nRet; 
   //When finished, free the region 
   return SUCCESS; 

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