Library Functions Manual

NAME¶

SoFont - The SoFont class is an appearance node for setting fonts.

SYNOPSIS¶

#include <Inventor/nodes/SoFont.h>

Inherits SoNode.

Inherited by SoFontStyle.

Public Member Functions¶

virtual SoType getTypeId (void) const
SoFont (void)
virtual void doAction (SoAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)
virtual void pick (SoPickAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
SbBool isOverride (void) const
void setNodeType (const NodeType type)
NodeType getNodeType (void) const
virtual SoNode * copy (SbBool copyconnections=FALSE) const
virtual SbBool affectsState (void) const
virtual void GLRenderBelowPath (SoGLRenderAction *action)
virtual void GLRenderInPath (SoGLRenderAction *action)
virtual void GLRenderOffPath (SoGLRenderAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void handleEvent (SoHandleEventAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void write (SoWriteAction *action)
virtual void audioRender (SoAudioRenderAction *action)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
virtual void startNotify (void)
virtual void notify (SoNotList *l)
uint32_t getNodeId (void) const
virtual SoChildList * getChildren (void) const
virtual void writeInstance (SoOutput *out)
virtual SoNode * addToCopyDict (void) const
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainer * copyThroughConnection (void) const

Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
SbBool hasDefaultValues (void) const
SbBool fieldsAreEqual (const SoFieldContainer *container) const
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool set (const char *const fielddata)
void get (SbString &fielddata)
virtual int getFields (SoFieldList &l) const
virtual int getAllFields (SoFieldList &l) const
virtual SoField * getField (const SbName &name) const
virtual SoField * getEventIn (const SbName &name) const
virtual SoField * getEventOut (const SbName &name) const
SbBool getFieldName (const SoField *const field, SbName &name) const
SbBool enableNotify (const SbBool flag)
SbBool isNotifyEnabled (void) const
SbBool set (const char *fielddata, SoInput *input)
void get (SbString &fielddata, SoOutput *out)
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool getIsBuiltIn (void) const
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void setUserData (void *userdata) const
void * getUserData (void) const

Public Member Functions inherited from SoBase
void ref (void) const
void unref (void) const
void unrefNoDelete (void) const
int32_t getRefCount (void) const
void touch (void)
SbBool isOfType (SoType type) const
virtual SbName getName (void) const
virtual void setName (const SbName &newname)
void addAuditor (void *const auditor, const SoNotRec::Type type)
void removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & getAuditors (void) const
SbBool shouldWrite (void)
void assertAlive (void) const

Static Public Member Functions¶

static SoType getClassTypeId (void)
static void initClass (void)

Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
static SoType getClassTypeId (void)
static SoNode * getByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
static void initClass (void)
static void initClasses (void)
static uint32_t getNextNodeId (void)
static int getActionMethodIndex (const SoType type)
static void getBoundingBoxS (SoAction *action, SoNode *node)
static void GLRenderS (SoAction *action, SoNode *node)
static void callbackS (SoAction *action, SoNode *node)
static void getMatrixS (SoAction *action, SoNode *node)
static void handleEventS (SoAction *action, SoNode *node)
static void pickS (SoAction *action, SoNode *node)
static void rayPickS (SoAction *action, SoNode *node)
static void searchS (SoAction *action, SoNode *node)
static void writeS (SoAction *action, SoNode *node)
static void audioRenderS (SoAction *action, SoNode *node)
static void getPrimitiveCountS (SoAction *action, SoNode *node)

Static Public Member Functions inherited from SoFieldContainer
static void initClass (void)
static SoType getClassTypeId (void)
static void cleanupClass (void)
static void initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainer * checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * findCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void copyDone (void)

Static Public Member Functions inherited from SoBase
static void initClass (void)
static SoType getClassTypeId (void)
static void addName (SoBase *const base, const char *const name)
static void removeName (SoBase *const base, const char *const name)
static void incrementCurrentWriteCounter (void)
static void decrementCurrentWriteCounter (void)
static SoBase * getNamedBase (const SbName &name, SoType type)
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
static void setInstancePrefix (const SbString &c)
static void setTraceRefs (SbBool trace)
static SbBool getTraceRefs (void)
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool readRoute (SoInput *input)

Public Attributes¶

SoSFName name
SoSFFloat size

Protected Member Functions¶

virtual const SoFieldData * getFieldData (void) const
virtual ~SoFont ()

Protected Member Functions inherited from SoNode
SoNode (void)
virtual ~SoNode ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)

Protected Member Functions inherited from SoFieldContainer
SoFieldContainer (void)
virtual ~SoFieldContainer ()

Protected Member Functions inherited from SoBase
SoBase (void)
virtual ~SoBase ()
virtual void destroy (void)
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void) const

Static Protected Member Functions¶

static const SoFieldData ** getFieldDataPtr (void)

Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
static void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)

Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
static void staticDataLock (void)
static void staticDataUnlock (void)

Additional Inherited Members¶

Public Types inherited from SoNode
enum NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000, COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000 }

Protected Types inherited from SoBase
enum BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }

Protected Attributes inherited from SoNode
uint32_t uniqueId

Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn

Static Protected Attributes inherited from SoNode
static uint32_t nextUniqueId = 1
static int nextActionMethodIndex = 0

Detailed Description¶

The SoFont class is an appearance node for setting fonts.

Successive text rendering nodes (like SoText2, SoText3, SoAsciiText, etc) will use the font specified from an SoFont node when visualizing text.

The font name is recognized with the form 'family:style'. The range of supported font families depends on which fonts are installed on the system. A typical font family might be 'Arial' or 'Times New Roman'.

Style is either 'Bold', 'Italic' or 'Bold Italic'.

Spaces before or after the ':' will be ignored.

If a good match for the chosen font cannot be found, the default font will be loaded instead. The default 2D font is a builtin 8x12 points font. The 3D font is a serif font ala Times New Roman. It is not possible to apply styles to any of the builtin fonts. It is not possible to specify a size for the default 2D font.

One can explicitly select the default font by setting 'defaultFont' as the font name, or by just leaving the SoFont::name field alone, as it has that value by default. In that regard, note that SoFont does not inherit / accumulate any parts from earlier SoFont-nodes, even when one or both of its fields are left blank in e.g. an iv-file, like this:

#Inventor V2.1 ascii
Font { name 'Helvetica'  size 50 }
Text2 { string 'hepp' }
Translation { translation 5 80 0 }
BaseColor { rgb 1 1 0 }
Font { size 30 }
Text2 { string 'svupp' }

(The second string in the above example will be rendered with the default built-in font, not in Helvetica.)

The default fonts are always accessible by Coin as they are embedded into the run-time library. If one needs to guarantee that the text will have the same appearance under all circumstances, the default font will be a safe choice. Another solution might be to use the FreeType font engine and explicitly name a font-file. This is described in more detail below.

Here is a simple example on how to print a string using a bold and italic Arial font:

#Inventor V2.1 ascii
Separator {


   Font {


     name 'Arial:Bold Italic'


     size 14


   }


   Text2 {


     string ['This is a', 'Coin font test']


     justification CENTER


   }    
}

Coin has support for two different font APIs. On non-Windows platforms, the FreeType library together with the optional Fontconfig library is used.

If the Fontconfig library is installed the font file on the sytem for a given font name will be located through it. For more information on Fontconfig see http://freedesktop.org/software/fontconfig . Additionally Fontconfig allows to match specific fonts through its own pattern matching format (see http://pdx.freedesktop.org/~fontconfig/fontconfig-user.html). Please note that the point size value in the textual representation of the Fontconfig pattern is currently overriden by the size field of the SoFont node and if no size field is specified the default value of the size field is in effect. In case you intend to use your application on systems where the Fontconfig library is expected to be not installed you should not make use of Fontconfig's font pattern syntax. Fontconfig usage can be prevented by setting the 'COIN_FORCE_FONTCONFIG_OFF' environment variable to 1.

Here is an example on how to print a string using the Fontconfig pattern matching syntax using a bold & italic font where Times New Roman is the preferred font family.

#Inventor V2.1 ascii
Separator {


   Font {


     name 'Times New Roman,Arial,Helvetica:italic:bold'


     size 24


   }


   Text2 {


     string ['This is a', 'Coin font test']


     justification CENTER


   }    
}

On Windows the Win32 GDI library is used. FreeType and Fontconfig are dynamically loaded on demand by Coin if font support are requested by a node. When fontsupport is loaded on Windows, FreeType will have precedence over Win32 if located. This can be prevented by setting the 'COIN_FORCE_FREETYPE_OFF' environment variable to 1. When using FreeType, you need FreeType version 2.1 or later. On Mac OS X, version 2.1.7 or later is required.

If Coin cannot load the FreeType library, and is not running on Microsoft Windows, only the default fonts will be accessible.

It is possible to specify the TrueType font file directly if FreeType is used as the font engine. This is done by including the '.ttf' in the filename, i.e. 'Comic_Sans_MS.ttf'. Coin will then search the local path for the running program and then the path specified by the 'COIN_FONT_PATH' environment variable. If the program is using FreeType on a Windows platform, the '$WINDIR/Fonts' directory will also be searched.

It is not possible to directly specify a TrueType font file if Windows is handling the fonts. This is due to the way Windows is accessing the fonts through the system registry. All fonts must therefore be properly installed and given a system name. Open the 'Control Panel' and double click on the 'Fonts' icon for an overview of installed fonts and their names.

Beware that some non-English versions of Windows are using different name for the styles (i.e. 'Italique' instead of 'Italic'). These names are supported in Coin, but it is recommended for portability purposes to only use the English terms. Please note that there is still a possibility that there are no fonts installed using the terms 'Bold' or 'Italic' on the Windows platform. To guarantee that a font is accessible you must either use the FreeType library and include a TrueType font in your distribution, or you must avoid using styles and stick to the standard Windows fonts.

If the 'COIN_DEBUG_FONTSUPPORT' environment variable is set to 1, an extensive amount of information about loading, initializing and using fonts will be output. Issues like missing fonts and other related problems will then be reported, so we advice you to first try to use that debugging option when something does not work quite as expected.

FILE FORMAT/DEFAULTS:

Font {


    name "defaultFont"


    size 10
}

See also

SoFontStyle, SoGlyph, SoText2, SoText3, SoAsciiText

Constructor & Destructor Documentation¶

SoFont::SoFont (void)¶

Constructor.

SoFont::~SoFont () [protected], [virtual]¶

Destructor.

Member Function Documentation¶

SoType SoFont::getTypeId (void) const [virtual]¶

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example:

void foo(SoNode * node)
{


  if (node->getTypeId() == SoFile::getClassTypeId()) {


    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type


  }
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.