LAnnPolyRuler::GetDistance

#include "ltwrappr.h"

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

L_DOUBLE *pdDistance;	/* address of the variable that will be updated with the distance of a ruler object */
L_DOUBLE *pdDistance2;	/* address of the variable that will be updated with the distance of a ruler object */

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

Parameter	Description
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.
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

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.

See Also

Functions:	LAnnAutomation::SetBitmapDpiX, LAnnAutomation::SetBitmapDpiY, LAnnAutomation::GetBitmapDpiX, LAnnAutomation::GetBitmapDpiY, LAnnRuler::SetUnit, LAnnRuler::GetUnit, LAnnRuler::SetGaugeLength, LAnnRuler::GetGaugeLength, LAnnPolyRuler::GetDistance2, ANNSMARTDISTANCE, Class Members
Topics:	Annotation Functions: Working with the Toolbar
	Implementing Annotations
	Automated User Interface for Annotations
	Using Rulers in Annotation Objects

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;
}