NAME
SoFont -
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.
SYNOPSIS
#include <Inventor/nodes/SoFont.h>
Inherits SoNode.
Inherited by SoFontStyle.
Public Member Functions
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)
Static Public Member Functions
static void initClass (void)
Public Attributes
SoSFName name
SoSFFloat size
Protected Member Functions
virtual ~SoFont ()
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" }
.fi
(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
}
}
.fi
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 Fontconfigs 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
}
}
.fi
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
void SoFont::initClass (void) [static] Sets up initialization for data
common to all instances of this class, like submitting necessary
information to the Coin type system.
Reimplemented from SoNode.
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).
Author
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