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LAnnPolyRuler::GetDistance

Summary

Gets the distance of the Ruler object(s) in the object's unit of measurement, set by LAnnRuler::SetUnit.

Syntax

#include "ltwrappr.h"

virtual L_INT LAnnPolyRuler::GetDistance(pdDistance, pdDistance2=0)

Parameters

L_DOUBLE *pdDistance

Address of the variable to be updated with the distance of the ruler object. For objects having only one ruler, this variable will be updated with the length. For cross products, which have two rulers, this variable will be updated with the length of the primary ruler.

L_DOUBLE *pdDistance2

Address of the variable to be updated with the distance of the ruler object. For cross products and protractors, which have two rulers, this variable will be updated with the length of the secondary ruler.

Comments

Either pdDistance or pdDistance2 can be NULL, but not both. If either of these pointers is NULL, the distance for that ruler will not be retrieved.

Returns

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

Required DLLs and Libraries

LTANN
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

gets the current measurement unit settings and displays them
if unit is not inches, make it so

L_INT LAnnPolyRuler_GetDistanceExample(LAnnPolyRuler * pAnnObject)  
{ 
	L_INT nRet; 
	L_SIZE_T uLen;  
   L_UINT uUnit;  
   HGLOBAL hUnitAbbrev;  
   L_TCHAR * pUnitAbbrev=NULL;  
   L_SIZE_T uPrecision;  
   L_TCHAR buf[180];  
   L_TCHAR dis[180];  
   L_TCHAR format[180];  
   L_DOUBLE dDistance;  
 
   /* first, get unit abbreviation string len */ 
   uLen = pAnnObject->GetUnitLen(); 
 
   /* allocate enough memory for the abbreviation string */ 
   hUnitAbbrev = GlobalAlloc(GMEM_MOVEABLE, (uLen+1)*sizeof(L_TCHAR));  
   pUnitAbbrev = (L_TCHAR *)GlobalLock(hUnitAbbrev);  
 
   /* get the settings */ 
   uUnit = pAnnObject->GetUnit (pUnitAbbrev, &uPrecision,NULL);  
 
   /* and, get the distance */ 
   nRet = pAnnObject->GetDistance(&dDistance);  
	if(nRet != SUCCESS) 
		return nRet; 
 
   /* display current settings & distance in current unit of measurement */ 
   wsprintf(buf, TEXT("Unit: %d\nAbbrev: %s\nPrecision: %d\n"), 
				uUnit, pUnitAbbrev, uPrecision);  
				wsprintf(format, TEXT("Distance: %%.%df\n"),uPrecision);  
				wsprintf(dis, format, dDistance);  
				lstrcat(buf, dis);  
 
   MessageBox(NULL, buf, TEXT("Units"), MB_OK);  
 
   /* if unit is not inches, make it so */ 
   if(uUnit != ANNUNIT_INCHES)  
	{ 
      nRet = pAnnObject->SetUnit (ANNUNIT_INCHES, TEXT("in"), 2, 0);  
		if(nRet != SUCCESS) 
			return nRet; 
	} 
 
   GlobalUnlock(hUnitAbbrev);  
   GlobalFree(hUnitAbbrev);  
	return SUCCESS; 
}