L_AnnSetFontSize - Raster Imaging C API Help

L_AnnSetFontSize

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnSetFontSize(hObject, dFontSize, uFlags)

HANNOBJECT hObject;

handle to the annotation object

L_DOUBLE dFontSize;

font size to set

L_UINT uFlags;

flags that determine which objects to process

Sets the font size of one or more annotation objects.

Parameter Description
hObject Handle to the annotation object.
dFontSize The font size to set, expressed as an unscaled value relative to the container.
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.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

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

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.

See Also

Functions:

L_AnnSetFontName, L_AnnGetFontName, L_AnnGetFontNameLen, L_AnnGetFontSize, L_AnnSetFontUnderline, L_AnnGetFontUnderline, L_AnnSetFontStrikeThrough, L_AnnGetFontStrikeThrough, L_AnnSetFontItalic, L_AnnGetFontItalic, L_AnnSetFontBold, L_AnnGetFontBold

Topics:

Annotation Functions: Object Properties

 

Annotation Objects - Default Values

 

Annotation Objects - Automated Features

 

Implementing an Automated Annotation Program

 

Implementing a Non-automated Annotation Program

 

Altering Annotation Object Settings

Example

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; 
   nRet = L_AnnSetFontSize (hAnnObject, FontSize * 2, 0); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
} 
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