This tool provides basic services for rendering of vectorized text glyphs as BRep shapes. Single instance initialize single font for sequential glyphs rendering with implicit caching of already rendered glyphs. Thus position of each glyph in the text is specified by shape location. More...

#include <Font_BRepFont.hxx>

Inheritance diagram for Font_BRepFont:

[legend]

Public Member Functions
	Font_BRepFont ()
	Empty constructor. More...

	Font_BRepFont (const NCollection_String &theFontPath, const Standard_Real theSize)
	Constructor with initialization. More...

	Font_BRepFont (const NCollection_String &theFontName, const Font_FontAspect theFontAspect, const Standard_Real theSize)
	Constructor with initialization. More...

virtual void	Release ()
	Release currently loaded font. More...

bool	Init (const NCollection_String &theFontPath, const Standard_Real theSize)
	Initialize the font. More...

bool	Init (const NCollection_String &theFontName, const Font_FontAspect theFontAspect, const Standard_Real theSize)
	Initialize the font. Please take into account that size is specified NOT in typography points (pt.). If you need to specify size in points, value should be converted. Formula for pt. -> m conversion: aSizeMeters = 0.0254 * theSizePt / 72.0. More...

TopoDS_Shape	RenderGlyph (const Standard_Utf32Char &theChar)
	Render single glyph as TopoDS_Shape. More...

void	SetCompositeCurveMode (const Standard_Boolean theToConcatenate)
	Setup glyph geometry construction mode. By default algorithm creates independent TopoDS_Edge for each original curve in the glyph (line segment or Bezie curve). Algorithm might optionally create composite BSpline curve for each contour which reduces memory footprint but limits curve class to C0. Notice that altering this flag clears currently accumulated cache! More...

TopoDS_Shape	RenderText (const NCollection_String &theString)
	Render text as BRep shape. More...

TopoDS_Shape	RenderText (const NCollection_String &theString, const gp_Ax3 &thePenLoc)
	Render text as BRep shape. More...

Standard_Real	Ascender () const

Standard_Real	Descender () const

Standard_Real	LineSpacing () const

Standard_Real	PointSize () const
	Configured point size. More...

Standard_Real	AdvanceX (const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered horizontally. More...

Standard_Real	AdvanceX (const Standard_Utf32Char theUChar, const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered horizontally. More...

Standard_Real	AdvanceY (const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered vertically. More...

Standard_Real	AdvanceY (const Standard_Utf32Char theUChar, const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered vertically. More...

Protected Member Functions
Standard_Boolean	renderGlyph (const Standard_Utf32Char theChar, TopoDS_Shape &theShape)
	Render single glyph as TopoDS_Shape. This method does not lock the mutex. More...

Protected Member Functions inherited from Font_FTFont
template<typename theInput_t >
FT_F26Dot6	toFTPoints (const theInput_t thePointSize) const
	Convert value to 26.6 fixed-point format for FT library API. More...

template<typename theReturn_t , typename theFTUnits_t >
theReturn_t	fromFTPoints (const theFTUnits_t theFTUnits) const
	Convert value from 26.6 fixed-point format for FT library API. More...

bool	loadGlyph (const Standard_Utf32Char theUChar)
	Load glyph without rendering it. More...

	Font_FTFont (const Handle< Font_FTLibrary > &theFTLib=NULL)
	Create uninitialized instance. More...

virtual	~Font_FTFont ()
	Destructor. More...

bool	IsValid () const

const Image_PixMap &	GlyphImage () const

bool	Init (const NCollection_String &theFontPath, const unsigned int thePointSize, const unsigned int theResolution=72)
	Initialize the font. More...

bool	Init (const NCollection_String &theFontName, const Font_FontAspect theFontAspect, const unsigned int thePointSize, const unsigned int theResolution)
	Initialize the font. More...

bool	RenderGlyph (const Standard_Utf32Char theChar)
	Render specified glyph into internal buffer (bitmap). More...

unsigned int	GlyphMaxSizeX () const

unsigned int	GlyphMaxSizeY () const

float	Ascender () const

float	Descender () const

float	LineSpacing () const

unsigned int	PointSize () const
	Configured point size. More...

float	AdvanceX (const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered horizontally. More...

float	AdvanceX (const Standard_Utf32Char theUChar, const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered horizontally. More...

float	AdvanceY (const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered vertically. More...

float	AdvanceY (const Standard_Utf32Char theUChar, const Standard_Utf32Char theUCharNext)
	Compute advance to the next character with kerning applied when applicable. Assuming text rendered vertically. More...

Standard_Integer	GlyphsNumber () const

void	GlyphRect (Font_FTFont::Rect &theRect) const
	Retrieve glyph bitmap rectangle. More...

Protected Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor. More...

	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing. More...

Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter. More...

virtual	~Standard_Transient ()
	Destructor must be virtual. More...

virtual void	Delete () const
	Memory deallocator for transient classes. More...

virtual const Handle_Standard_Type &	DynamicType () const
	Returns a type information object about this object. More...

Standard_Boolean	IsInstance (const Handle_Standard_Type &theType) const
	Returns a true value if this is an instance of Type. More...

Standard_Boolean	IsInstance (const Standard_CString theTypeName) const
	Returns a true value if this is an instance of TypeName. More...

Standard_Boolean	IsKind (const Handle_Standard_Type &theType) const
	Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Boolean	IsKind (const Standard_CString theTypeName) const
	Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

virtual Handle_Standard_Transient	This () const
	Returns a Handle which references this object. Must never be called to objects created in stack. More...

Standard_Integer	GetRefCount () const
	Get the reference counter of this object. More...

Protected Attributes
Protected fields
NCollection_DataMap< Standard_Utf32Char, TopoDS_Shape >	myCache
	glyphs cache More...

Standard_Mutex	myMutex
	lock for thread-safety More...

Handle< Geom_Surface >	mySurface
	surface to place glyphs on to More...

Standard_Real	myPrecision
	algorithm precision More...

Standard_Real	myScaleUnits
	scale font rendering units into model units More...

Standard_Boolean	myIsCompositeCurve
	flag to merge C1 curves of each contour into single C0 curve, ON by default More...

Shared temporary variables for glyph construction
Adaptor3d_CurveOnSurface	myCurvOnSurf

Handle< Geom2dAdaptor_HCurve >	myCurve2dAdaptor

Geom2dConvert_CompCurveToBSplineCurve	myConcatMaker

TColgp_Array1OfPnt2d	my3Poles

TColgp_Array1OfPnt2d	my4Poles

BRep_Builder	myBuilder

ShapeFix_Face	myFixer

Protected Attributes inherited from Font_FTFont
Handle< Font_FTLibrary >	myFTLib
	handle to the FT library object More...

FT_Face	myFTFace
	FT face object. More...

NCollection_String	myFontPath
	font path More...

unsigned int	myPointSize
	point size set by FT_Set_Char_Size More...

FT_Int32	myLoadFlags
	default load flags More...

Image_PixMap	myGlyphImg
	cached glyph plane More...

FT_Vector	myKernAdvance
	buffer variable More...

Standard_Utf32Char	myUChar
	currently loaded unicode character More...

Detailed Description

This tool provides basic services for rendering of vectorized text glyphs as BRep shapes. Single instance initialize single font for sequential glyphs rendering with implicit caching of already rendered glyphs. Thus position of each glyph in the text is specified by shape location.

Please notice that this implementation uses mutex for thread-safety access, thus may lead to performance penalties in case of concurrent access. Although caching should eliminate this issue after rendering of sufficient number of glyphs.

Constructor & Destructor Documentation

Font_BRepFont::Font_BRepFont ( )

Empty constructor.

Font_BRepFont::Font_BRepFont	(	const NCollection_String &	theFontPath,
		const Standard_Real	theSize
	)

Constructor with initialization.

Parameters

theFontPath	FULL path to the font
theSize	the face size in model units

Font_BRepFont::Font_BRepFont	(	const NCollection_String &	theFontName,
		const Font_FontAspect	theFontAspect,
		const Standard_Real	theSize
	)

Constructor with initialization.

Parameters

theFontName	the font name
theFontAspect	the font style
theSize	the face size in model units

Member Function Documentation

Standard_Real Font_BRepFont::AdvanceX ( const Standard_Utf32Char theUCharNext )

inline

Compute advance to the next character with kerning applied when applicable. Assuming text rendered horizontally.

Standard_Real Font_BRepFont::AdvanceX	(	const Standard_Utf32Char	theUChar,
		const Standard_Utf32Char	theUCharNext
	)

inline

Compute advance to the next character with kerning applied when applicable. Assuming text rendered horizontally.

Standard_Real Font_BRepFont::AdvanceY ( const Standard_Utf32Char theUCharNext )

inline

Compute advance to the next character with kerning applied when applicable. Assuming text rendered vertically.

Standard_Real Font_BRepFont::AdvanceY	(	const Standard_Utf32Char	theUChar,
		const Standard_Utf32Char	theUCharNext
	)

inline

Compute advance to the next character with kerning applied when applicable. Assuming text rendered vertically.

Standard_Real Font_BRepFont::Ascender ( ) const

inline

Returns: vertical distance from the horizontal baseline to the highest character coordinate.

Standard_Real Font_BRepFont::Descender ( ) const

inline

Returns: vertical distance from the horizontal baseline to the lowest character coordinate.

bool Font_BRepFont::Init	(	const NCollection_String &	theFontPath,
		const Standard_Real	theSize
	)

Initialize the font.

Parameters

theFontPath	FULL path to the font
theSize	the face size in model units

Returns: true on success

bool Font_BRepFont::Init	(	const NCollection_String &	theFontName,
		const Font_FontAspect	theFontAspect,
		const Standard_Real	theSize
	)

Initialize the font. Please take into account that size is specified NOT in typography points (pt.). If you need to specify size in points, value should be converted. Formula for pt. -> m conversion: aSizeMeters = 0.0254 * theSizePt / 72.0.

Parameters

theFontName	the font name
theFontAspect	the font style
theSize	the face size in model units

Returns: true on success

Standard_Real Font_BRepFont::LineSpacing ( ) const

inline

Returns: default line spacing (the baseline-to-baseline distance).

Standard_Real Font_BRepFont::PointSize ( ) const

inline

Configured point size.

virtual void Font_BRepFont::Release ( )

virtual

Release currently loaded font.

Reimplemented from Font_FTFont.

TopoDS_Shape Font_BRepFont::RenderGlyph ( const Standard_Utf32Char & theChar )

Render single glyph as TopoDS_Shape.

Parameters

theChar glyph identifier

Returns: rendered glyph within cache, might be NULL shape

Standard_Boolean Font_BRepFont::renderGlyph	(	const Standard_Utf32Char	theChar,
		TopoDS_Shape &	theShape
	)

protected

Render single glyph as TopoDS_Shape. This method does not lock the mutex.

Parameters

theChar	glyph identifier
theShape	rendered glyph within cache, might be NULL shape

Returns: true if glyph's geometry is available

TopoDS_Shape Font_BRepFont::RenderText ( const NCollection_String & theString )

Render text as BRep shape.

Parameters

theString text in UTF-8 encoding

Returns: result shape within XOY plane and start position (0,0,0) on the baseline

TopoDS_Shape Font_BRepFont::RenderText	(	const NCollection_String &	theString,
		const gp_Ax3 &	thePenLoc
	)

inline

Render text as BRep shape.

Parameters

theString	text in UTF-8 encoding
thePenLoc	start position and orientation on the baseline

Returns: result shape with pen transformation applied as shape location

void Font_BRepFont::SetCompositeCurveMode ( const Standard_Boolean theToConcatenate )

Setup glyph geometry construction mode. By default algorithm creates independent TopoDS_Edge for each original curve in the glyph (line segment or Bezie curve). Algorithm might optionally create composite BSpline curve for each contour which reduces memory footprint but limits curve class to C0. Notice that altering this flag clears currently accumulated cache!

Field Documentation

TColgp_Array1OfPnt2d Font_BRepFont::my3Poles

protected

TColgp_Array1OfPnt2d Font_BRepFont::my4Poles

protected

BRep_Builder Font_BRepFont::myBuilder

protected

NCollection_DataMap<Standard_Utf32Char, TopoDS_Shape> Font_BRepFont::myCache

protected

glyphs cache

Geom2dConvert_CompCurveToBSplineCurve Font_BRepFont::myConcatMaker

protected

Handle< Geom2dAdaptor_HCurve > Font_BRepFont::myCurve2dAdaptor

protected

Adaptor3d_CurveOnSurface Font_BRepFont::myCurvOnSurf

protected

ShapeFix_Face Font_BRepFont::myFixer

protected

Standard_Boolean Font_BRepFont::myIsCompositeCurve

protected

flag to merge C1 curves of each contour into single C0 curve, ON by default

Standard_Mutex Font_BRepFont::myMutex

protected

lock for thread-safety

Standard_Real Font_BRepFont::myPrecision

protected

algorithm precision

Standard_Real Font_BRepFont::myScaleUnits

protected

scale font rendering units into model units

Handle< Geom_Surface > Font_BRepFont::mySurface

protected

surface to place glyphs on to

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

Font_BRepFont.hxx

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Field Documentation