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L_GetRgnPerimeterLength

Summary

Computes the length of the perimeter of a region.

Syntax

#include "l_bitmap.h"

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

Parameters

pRGNXFORM 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.

L_SIZE_T *puLength

Address of a variable to be updated with the perimeter length of the region. The length is expressed in pixels.

Returns

Value	Meaning
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.

Example

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("Master.jpg")), &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; 
}