SoFont Class Reference

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. More...

#include <Inventor/nodes/SoFont.h>

Inheritance diagram for SoFont:

Public Member Functions
virtual SoType	getTypeId (void) const
	Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and "downward" casting. More...
	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
	Returns TRUE if the type of this object is either of the same type or inherited from type. More...
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)
	Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static SoType	getClassTypeId (void)
	This static method returns the SoType object associated with objects of this class.
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
virtual SoNotRec	createNotRec (void)

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, COIN_4_0 = 0x20000 }
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, SoText2, SoText3, SoAsciiText

Constructor & Destructor Documentation

SoFont::SoFont

(

void

)

Constructor.

SoFont::~SoFont ( )

protectedvirtual

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.

Reimplemented in SoFontStyle.

const SoFieldData * SoFont::getFieldData ( void  ) const

protectedvirtual

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

Reimplemented in SoFontStyle.

void SoFont::doAction ( SoAction *  action )

virtual

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

Reimplemented in SoFontStyle.

void SoFont::getBoundingBox ( SoGetBoundingBoxAction *  action )

virtual

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

Reimplemented in SoFontStyle.

void SoFont::GLRender ( SoGLRenderAction *  action )

virtual

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

Reimplemented in SoFontStyle.

void SoFont::callback ( SoCallbackAction *  action )

virtual

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

Reimplemented in SoFontStyle.

void SoFont::pick ( SoPickAction *  action )

virtual

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

Reimplemented in SoFontStyle.

void SoFont::getPrimitiveCount ( SoGetPrimitiveCountAction *  action )

virtual

Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculates their primitive count also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

Reimplemented in SoFontStyle.

Member Data Documentation

SoSFName SoFont::name

Name of font.

Which fontnames are available is rather system dependent, not only on whether or not you are running on a UNIX/Linux system, Microsoft Windows or whatever, but also on which fonts and font types (like TrueType) are installed on a particular user's system.

All font rendering nodes have a built-in fallback font to use, though, so even though Coin can not find a font on the system of the specified type, the text should be rendered somehow.

In summation, consider this node type and this particular field as a hint to the font rendering engines of Coin, and do not base your models on a particular font being available.

SoSFFloat SoFont::size

Size of font. Defaults to 10.0.

For 2D rendered bitmap fonts (like for SoText2), this value is the height of a character in screen pixels. For 3D text, this value is the world-space coordinates height of a character in the current units setting (see documentation for SoUnits node).

---

The documentation for this class was generated from the following files:

• SoFont.h
• SoFont.cpp