Sets the font size of one or more annotation objects.


#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnSetFontSize(hObject, dFontSize, uFlags)



Handle to the annotation object.

L_DOUBLE dFontSize

The font size to set, expressed as an unscaled value relative to the container.

L_UINT uFlags

Flags that determine which objects to process. Most of the flags apply only to container objects. 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 L_AnnGetSelected and L_AnnSetSelected functions.
ANNFLAG_NOTTHIS [0x0004] Process only one level of objects within the specified container, not the container itself. If there are containers within the container, they are modified, but the objects within them are not.
ANNFLAG_RECURSE [0x0008] Process objects within a container, and within any subcontainers, down to any level.
ANNFLAG_NOTCONTAINER [0x0002] (Used with ANNFLAG_RECURSE) Process objects within containers, not the containers themselves.
ANNFLAG_NOINVALIDATE [0x0010] Do not invalidate the affected rectangle in the window. Use this to avoid generating unwanted paint messages.
ANNFLAG_CHECKMENU [0x0020] Process objects only if the ANNAUTOTEXT_MENU_FONT menu item has been selected.


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


The font size of an object is relative to its container object. The height of a font is interpreted using the container's vertical scaling factor. For example, suppose you want the font to appear as a 10-point font on your screen using the current scaling factor. You would use the following calculation, where A is the pixel height of a 10-point font, B is the value that you get from the L_AnnGetScalarX function, and C is the value that you get from the L_AnnGetScalarY function:

dFontSize = A / sqrt( B * C )

For more information, refer to Low-Level Coordinate System for Annotations.

This function applies to multiple and selected objects based on values of the uFlags parameter.

This function does not affect objects that do not have this property or that do not let you change the property. For descriptions of the various types of objects and their properties, refer to Types of Annotations.

Required DLLs and Libraries


Win32, x64.

See Also




L_INT AnnSetFontSizeExample(HANNOBJECT hAnnObject) 
   L_INT    nRet; 
   L_DOUBLE FontSize; /* Object font size */ 
   /* Double the font size */ 
   nRet = L_AnnGetFontSize(hAnnObject, &FontSize); 
   if (nRet != SUCCESS) 
      return nRet; 
   return  L_AnnSetFontSize(hAnnObject, FontSize * 2, 0); 
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.