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qwttextengine

QwtTextEngine(3)						 Qwt User's Guide						  QwtTextEngine(3)

NAME

       QwtTextEngine -

       Abstract base class for rendering text strings.

SYNOPSIS

       #include <qwt_text_engine.h>

       Inherited by QwtMathMLTextEngine, QwtPlainTextEngine, and QwtRichTextEngine.

   Public Member Functions
       virtual void draw (QPainter *painter, const QRect &rect, int flags, const QString &text) const =0
       virtual int heightForWidth (const QFont &font, int flags, const QString &text, int width) const =0
       virtual bool mightRender (const QString &text) const =0
       virtual void textMargins (const QFont &font, const QString &text, int &left, int &right, int &top, int &bottom) const =0
       virtual QSize textSize (const QFont &font, int flags, const QString &text) const =0
       virtual ~QwtTextEngine ()

   Protected Member Functions
       QwtTextEngine ()

Detailed Description
       Abstract base class for rendering text strings.

       A text engine is responsible for rendering texts for a specific text format. They are used by QwtText to render a text.

       QwtPlainTextEngine and QwtRichTextEngine are part of the Qwt library.

       QwtMathMLTextEngine can be found in Qwt MathML extension, that needs the MathML renderer of the Qt solutions package. Unfortunately it is
       only available with a commercial Qt license.

       See also:
	   QwtText::setTextEngine()

Constructor &; Destructor Documentation
   QwtTextEngine::~QwtTextEngine () [virtual]
       Destructor.

   QwtTextEngine::QwtTextEngine () [protected]
       Constructor.

Member Function Documentation
   virtual void QwtTextEngine::draw (QPainter *painter, const QRect &rect, intflags, const QString &text) const [pure virtual] Draw the text in a
       clipping rectangle
       Parameters:
	   painter Painter
	   rect Clipping rectangle
	   flags Bitwise OR of the flags like in for QPainter::drawText
	   text Text to be rendered

       Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

   virtual int QwtTextEngine::heightForWidth (const QFont &font, intflags, const QString &text, intwidth) const [pure virtual] Find the height for
       a given width
       Parameters:
	   font Font of the text
	   flags Bitwise OR of the flags used like in QPainter::drawText
	   text Text to be rendered
	   width Width

       Returns:
	   Calculated height

       Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

   virtual bool QwtTextEngine::mightRender (const QString &text) const [pure virtual] Test if a string can be rendered by this text engine
       Parameters:
	   text Text to be tested

       Returns:
	   true, if it can be rendered

       Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

   virtual void QwtTextEngine::textMargins (const QFont &font, const QString &text, int &left, int &right, int &top, int &bottom) const [pure
       virtual] Return margins around the texts
       The textSize might include margins around the text, like QFontMetrics::descent. In situations where texts need to be aligend in detail,
       knowing these margins might improve the layout calculations.

       Parameters:
	   font Font of the text
	   text Text to be rendered
	   left Return value for the left margin
	   right Return value for the right margin
	   top Return value for the top margin
	   bottom Return value for the bottom margin

       Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

   virtual QSize QwtTextEngine::textSize (const QFont &font, intflags, const QString &text) const [pure virtual] Returns the size, that is needed
       to render text
       Parameters:
	   font Font of the text
	   flags Bitwise OR of the flags like in for QPainter::drawText
	   text Text to be rendered

       Returns:
	   Caluclated size

       Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

Author
       Generated automatically by Doxygen for Qwt User's Guide from the source code.

Version 5.2.2							  Mon Aug 1 2011						  QwtTextEngine(3)