L_GetRgnPerimeterLength

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#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_GetRgnPerimeterLength (pBitmap, pXForm, puLength, uFlags)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
pRGNXFORM pXForm;	/* pointer to a coordinate-translation structure */
L_SIZE_T *puLength;	/* pointer to a variable to be updated */
L_UINT32 uFlags;	/* flags */

Computes the length of the perimeter of a region.

Parameter	Description
pBitmap	Pointer to the bitmap handle.
pXForm	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.
puLength	Address of a variable to be updated with the perimeter length of the region. The length is expressed in pixels.
uFlags	Reserved for future use. Must be 0.

Returns

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

Comments

This function works only on bitmaps having a region. If a bitmap does not have a region the function returns the error: Not Initialized.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in the Document and Medical Imaging toolkits.

Required DLLs and Libraries

LTIMGEFX

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_AddShadowBitmap, L_AllocFTArray, L_ChangeHueSatIntBitmap, L_ColorReplaceBitmap, L_ColorThresholdBitmap, L_DFTBitmap, L_DirectionEdgeStatisticalBitmap, L_FFTBitmap, L_FreeFTArray, L_FrqFilterBitmap, L_FrqFilterMaskBitmap, L_FTDisplayBitmap, L_GetBitmapStatisticsInfo, L_GetFeretsDiameter, L_GetObjectInfo, L_GetRgnContourPoints, L_MathFunctionBitmap, L_RevEffectBitmap, L_SegmentBitmap, L_SubtractBackgroundBitmap, L_UserFilterBitmap
Topics:	Working with the Existing Bitmap Region
	Raster Image Functions: Creating and Using a Region
	Raster Image Functions: Analysis Image Object or Region Analysis

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


#if defined (LEADTOOLS_V16_OR_LATER)
 L_INT GetRgnPerimeterLengthExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */
   RECT   rcRect; 
   L_SIZE_T   uPerimeter; 
   /* Load a bitmap at its own bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS)
      return nRet;
   rcRect.top = LeadBitmap.Height/3; 
   rcRect.bottom = LeadBitmap.Height*2/3; 
   rcRect.left = LeadBitmap.Width/3; 
   rcRect.right = LeadBitmap.Width*2/3; 
   nRet = L_SetBitmapRgnEllipse (&LeadBitmap, NULL, &rcRect, L_RGN_SET); 
   if(nRet !=SUCCESS)
      return nRet;
   nRet = L_GetRgnPerimeterLength(&LeadBitmap, NULL, &uPerimeter, 0);
   if(nRet !=SUCCESS)
      return nRet;
   
   //free bitmap 
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);  
   

   return SUCCESS;
}
#else
 L_INT GetRgnPerimeterLengthExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */
   RECT   rcRect; 
   L_SIZE_T   uPerimeter; 
   /* Load a bitmap at its own bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image3.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS)
      return nRet;
   rcRect.top = LeadBitmap.Height/3; 
   rcRect.bottom = LeadBitmap.Height*2/3; 
   rcRect.left = LeadBitmap.Width/3; 
   rcRect.right = LeadBitmap.Width*2/3; 
   nRet = L_SetBitmapRgnEllipse (&LeadBitmap, NULL, &rcRect, L_RGN_SET); 
   if(nRet !=SUCCESS)
      return nRet;
   nRet = L_GetRgnPerimeterLength(&LeadBitmap, NULL, &uPerimeter);
   if(nRet !=SUCCESS)
      return nRet;
   
   //free bitmap 
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);  
   

   return SUCCESS;
}
#endif // LEADTOOLS_V16_OR_LATER