QwtTextEngine - Abstract base class for rendering text strings.

NAME  SYNOPSIS  Public Member Functions  Protected Member Functions  Detailed Description  Constructor & Destructor Documentation  QwtTextEngine::˜QwtTextEngine () [virtual]  QwtTextEngine::QwtTextEngine () [protected]  Member Function Documentation  virtual void QwtTextEngine::draw (QPainter * painter, const QRectF & rect,int flags, const QString & text) const [pure virtual]  virtual double QwtTextEngine::heightForWidth (const QFont & font, intflags, const QString & text, double width) const [pure virtual]  virtual bool QwtTextEngine::mightRender (const QString & text) const [purevirtual]  virtual void QwtTextEngine::textMargins (const QFont & font, const QString& text, double & left, double & right, double & top, double & bottom)const [pure virtual]  virtual QSizeF QwtTextEngine::textSize (const QFont & font, int flags,const QString & text) const [pure virtual]  Author 

---

NAME

QwtTextEngine − Abstract base class for rendering text strings.

SYNOPSIS

#include <qwt_text_engine.h>

Inherited by QwtPlainTextEngine, and QwtRichTextEngine.

Public Member Functions

virtual ˜QwtTextEngine ()
Destructor.
virtual double heightForWidth (const QFont &font, int flags, const QString &text, double width) const =0
virtual QSizeF textSize (const QFont &font, int flags, const QString &text) const =0
virtual bool mightRender (const QString &text) const =0
virtual void textMargins (const QFont &font, const QString &text, double &left, double &right, double &top, double &bottom) const =0
virtual void draw (QPainter *painter, const QRectF &rect, int flags, const QString &text) const =0

Protected Member Functions

QwtTextEngine ()
Constructor.

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.

See also

QwtText::setTextEngine()

Definition at line 30 of file qwt_text_engine.h.

Constructor & Destructor Documentation

QwtTextEngine::˜QwtTextEngine () [virtual]

Destructor.

Definition at line 146 of file qwt_text_engine.cpp.

QwtTextEngine::QwtTextEngine () [protected]

Constructor.

Definition at line 141 of file qwt_text_engine.cpp.

Member Function Documentation

virtual void QwtTextEngine::draw (QPainter * painter, const QRectF & rect,int flags, 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, and QwtRichTextEngine.

virtual double QwtTextEngine::heightForWidth (const QFont & font, intflags, const QString & text, double width) 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, and QwtRichTextEngine.

virtual bool QwtTextEngine::mightRender (const QString & text) const [purevirtual]

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, and QwtRichTextEngine.

virtual void QwtTextEngine::textMargins (const QFont & font, const QString& text, double & left, double & right, double & top, double & 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 aligned 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, and QwtRichTextEngine.

virtual QSizeF QwtTextEngine::textSize (const QFont & font, int flags,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

Calculated size

Implemented in QwtPlainTextEngine, and QwtRichTextEngine.

Author

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

---