#include "ltwrappr.h"

virtual L_INT LAnnRuler::SetUnit(uUnit, pUnitAbbrev, uPrecision, uFlags=0)

L_UINT uUnit;

unit of measure

L_TCHAR * pUnitAbbrev;

character string containing the unit abbreviation string

L_UINT uPrecision;

number of digits to be displayed after the decimal place

L_UINT uFlags;

flags that determine the object to process

Sets the unit of measurement for the rulers used by those objects that use rulers.

Parameter Description
uUnit The unit of measure of the ruler. Possible values are:
  Value Meaning
  ANNUNIT_INCH [0x0000] inches
  ANNUNIT_FEET [0x0001] feet
  ANNUNIT_YARDS [0x0002] yards
  ANNUNIT_MICROMETERS [0x0003] micrometers
  ANNUNIT_MILLIMETERS [0x0004] millimeters
  ANNUNIT_CENTIMETERS [0x0005] centimeters
  ANNUNIT_METERS [0x0006] meters
  ANNUNIT_TWIPS [0x0007] twips
  ANNUNIT_POINTS [0x0008] points
  ANNUNIT_PIXELS [0x0009] pixels
  ANNUNIT_SMART_METRIC [0x0010] Smart Metric
  ANNUNIT_SMART_ENGLISH [0x0011] Smart English
pUnitAbbrev Character string containing the unit abbreviation string to be displayed after the distance. You can pass NULL to get the default abbreviations for the current unit of measurement.
uPrecision Number of digits to be displayed after the decimal place.
uFlags Flags that determine the object to process. You can combine values when appropriate by using a bitwise OR ( | ). The following are valid values:
  Value Meaning
  0 Process only the specified object.
  ANNFLAG_SELECTED [0x0001] Process only objects that have the selected property set to TRUE. For getting and setting the selected property, use the LAnnotation::IsSelected and LAnnotation::SetSelected functions.
  ANNFLAG_NOINVALIDATE [0x0010] Do not invalidate the affected rectangle in the window. Use this to avoid generating unwanted paint messages.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


The following annotation objects utilize one or more rulers as part of the annotation:





In addition, the Automation object (ANNOBJECT_AUTOMATION) stores default ruler settings along with the other object default settings.

To determine the unit of measure for each ruler as well as its precision, call the LAnnAutomation::GetUnit function or the LAnnRuler::GetUnit function. The default unit of measure for Ruler, Polyruler, and Crossproduct objects is Smart English. With the smart units, the unit changes with the length. For example, if the length is 11 inches (assuming the default precision of 2 is being used), "11.00 in" displays whereas if the length is 15 inches, "1 ft 3.00 in" displays. Call the LAnnAutomation::SetUnit or the LAnnRuler::SetUnit function to set the unit of measurement and its precision for the ruler. The precision indicates how many digits to display to the right of the decimal point in the length.

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


Class Members, LAnnPolyRuler::GetDistance2, ANNSMARTDISTANCE, LAnnotation::CalibrateRuler


Annotation Functions: Working with the Toolbar


Implementing Annotations


Automated User Interface for Annotations


Using Rulers in Annotation Objects


Calibrating Annotation Ruler Objects


L_INT LAnnRuler_SetUnitExample(LAnnRuler  * pAnnObject) 
   L_INT nRet; 
   L_SIZE_T uLen; 
   L_UINT uUnit; 
   L_TCHAR * pUnitAbbrev=NULL; 
   L_SIZE_T uPrecision; 
   L_TCHAR buf[180]; 
   L_DOUBLE dDistance; 
   LBuffer LeadBuffer ; 
   /* first, get unit abbreviation string len */ 
   uLen = pAnnObject->GetUnitLen(); 
   LeadBuffer.Reallocate((DWORD)uLen * sizeof(L_TCHAR)) ; 
   pUnitAbbrev = (L_TCHAR *)LeadBuffer.Lock(); 
   /* 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\nDistance: %d\n"), 
   uUnit, pUnitAbbrev, uPrecision, dDistance); 
   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("Inch"), 2, 0); 
      if(nRet != SUCCESS) 
         return nRet; 
   return SUCCESS; 

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