Provided by: libqwt-doc_6.1.4-2build2_all 
NAME
QwtText - A class representing a text.
SYNOPSIS
#include <qwt_text.h>
Public Types
enum TextFormat { AutoText = 0, PlainText, RichText, MathMLText, TeXText, OtherFormat = 100 }
Text format.
enum PaintAttribute { PaintUsingTextFont = 0x01, PaintUsingTextColor = 0x02, PaintBackground = 0x04 }
Paint Attributes.
enum LayoutAttribute { MinimumLayout = 0x01 }
Layout Attributes The layout attributes affects some aspects of the layout of the text.
typedef QFlags< PaintAttribute > PaintAttributes
Paint attributes.
typedef QFlags< LayoutAttribute > LayoutAttributes
Layout attributes.
Public Member Functions
QwtText (const QString &=QString(), TextFormat textFormat=AutoText)
QwtText (const QwtText &)
Copy constructor.
~QwtText ()
Destructor.
QwtText & operator= (const QwtText &)
Assignment operator.
bool operator== (const QwtText &) const
Relational operator.
bool operator!= (const QwtText &) const
Relational operator.
void setText (const QString &, QwtText::TextFormat textFormat=AutoText)
QString text () const
bool isNull () const
bool isEmpty () const
void setFont (const QFont &)
QFont font () const
Return the font.
QFont usedFont (const QFont &) const
void setRenderFlags (int)
Change the render flags.
int renderFlags () const
void setColor (const QColor &)
QColor color () const
Return the pen color, used for painting the text.
QColor usedColor (const QColor &) const
void setBorderRadius (double)
double borderRadius () const
void setBorderPen (const QPen &)
QPen borderPen () const
void setBackgroundBrush (const QBrush &)
QBrush backgroundBrush () const
void setPaintAttribute (PaintAttribute, bool on=true)
bool testPaintAttribute (PaintAttribute) const
void setLayoutAttribute (LayoutAttribute, bool on=true)
bool testLayoutAttribute (LayoutAttribute) const
double heightForWidth (double width, const QFont &=QFont()) const
QSizeF textSize (const QFont &=QFont()) const
void draw (QPainter *painter, const QRectF &rect) const
Static Public Member Functions
static const QwtTextEngine * textEngine (const QString &text, QwtText::TextFormat=AutoText)
static const QwtTextEngine * textEngine (QwtText::TextFormat)
Find the text engine for a text format.
static void setTextEngine (QwtText::TextFormat, QwtTextEngine *)
Detailed Description
A class representing a text.
A QwtText is a text including a set of attributes how to render it.
• Format
A text might include control sequences (f.e tags) describing how to render it. Each format (f.e
MathML, TeX, Qt Rich Text) has its own set of control sequences, that can be handles by a special
QwtTextEngine for this format.
• Background
A text might have a background, defined by a QPen and QBrush to improve its visibility. The corners of
the background might be rounded.
• Font
A text might have an individual font.
• Color
A text might have an individual color.
• Render Flags
Flags from Qt::AlignmentFlag and Qt::TextFlag used like in QPainter::drawText().
See also:
QwtTextEngine, QwtTextLabel
Member Enumeration Documentation
enum QwtText::LayoutAttribute
Layout Attributes The layout attributes affects some aspects of the layout of the text.
Enumerator
MinimumLayout
Layout the text without its margins. This mode is useful if a text needs to be aligned accurately,
like the tick labels of a scale. If QwtTextEngine::textMargins is not implemented for the format
of the text, MinimumLayout has no effect.
enum QwtText::PaintAttribute
Paint Attributes. Font and color and background are optional attributes of a QwtText. The paint
attributes hold the information, if they are set.
Enumerator
PaintUsingTextFont
The text has an individual font.
PaintUsingTextColor
The text has an individual color.
PaintBackground
The text has an individual background.
enum QwtText::TextFormat
Text format. The text format defines the QwtTextEngine, that is used to render the text.
See also:
QwtTextEngine, setTextEngine()
Enumerator
AutoText
The text format is determined using QwtTextEngine::mightRender() for all available text engines in
increasing order > PlainText. If none of the text engines can render the text is rendered like
QwtText::PlainText.
PlainText
Draw the text as it is, using a QwtPlainTextEngine.
RichText
Use the Scribe framework (Qt Rich Text) to render the text.
MathMLText
Use a MathML (http://en.wikipedia.org/wiki/MathML) render engine to display the text. The Qwt
MathML extension offers such an engine based on the MathML renderer of the former Qt solutions
package. To enable MathML support the following code needs to be added to the application:
QwtText::setTextEngine( QwtText::MathMLText, new QwtMathMLTextEngine() );
TeXText
Use a TeX (http://en.wikipedia.org/wiki/TeX) render engine to display the text ( not implemented
yet ).
OtherFormat
The number of text formats can be extended using setTextEngine. Formats >= QwtText::OtherFormat
are not used by Qwt.
Constructor & Destructor Documentation
QwtText::QwtText (const QString & text = QString(), QwtText::TextFormat textFormat = AutoText)
Constructor
Parameters:
text Text content
textFormat Text format
Member Function Documentation
QBrush QwtText::backgroundBrush () const
Returns:
Background brush
See also:
setBackgroundBrush(), borderPen()
QPen QwtText::borderPen () const
Returns:
Background pen
See also:
setBorderPen(), backgroundBrush()
double QwtText::borderRadius () const
Returns:
Radius for the corners of the border frame
See also:
setBorderRadius(), borderPen(), backgroundBrush()
void QwtText::draw (QPainter * painter, const QRectF & rect) const
Draw a text into a rectangle
Parameters:
painter Painter
rect Rectangle
double QwtText::heightForWidth (double width, const QFont & defaultFont = QFont()) const
Find the height for a given width
Parameters:
defaultFont Font, used for the calculation if the text has no font
width Width
Returns:
Calculated height
bool QwtText::isEmpty () const [inline]
Returns:
text().isEmpty()
bool QwtText::isNull () const [inline]
Returns:
text().isNull()
int QwtText::renderFlags () const
Returns:
Render flags
See also:
setRenderFlags()
void QwtText::setBackgroundBrush (const QBrush & brush)
Set the background brush
Parameters:
brush Background brush
See also:
backgroundBrush(), setBorderPen()
void QwtText::setBorderPen (const QPen & pen)
Set the background pen
Parameters:
pen Background pen
See also:
borderPen(), setBackgroundBrush()
void QwtText::setBorderRadius (double radius)
Set the radius for the corners of the border frame
Parameters:
radius Radius of a rounded corner
See also:
borderRadius(), setBorderPen(), setBackgroundBrush()
void QwtText::setColor (const QColor & color)
Set the pen color used for drawing the text.
Parameters:
color Color
Note:
Setting the color might have no effect, when the text contains control sequences for setting colors.
void QwtText::setFont (const QFont & font)
Set the font.
Parameters:
font Font
Note:
Setting the font might have no effect, when the text contains control sequences for setting fonts.
void QwtText::setLayoutAttribute (LayoutAttribute attribute, bool on = true)
Change a layout attribute
Parameters:
attribute Layout attribute
on On/Off
See also:
testLayoutAttribute()
void QwtText::setPaintAttribute (PaintAttribute attribute, bool on = true)
Change a paint attribute
Parameters:
attribute Paint attribute
on On/Off
Note:
Used by setFont(), setColor(), setBorderPen() and setBackgroundBrush()
See also:
testPaintAttribute()
void QwtText::setRenderFlags (int renderFlags)
Change the render flags. The default setting is Qt::AlignCenter
Parameters:
renderFlags Bitwise OR of the flags used like in QPainter::drawText()
See also:
renderFlags(), QwtTextEngine::draw()
Note:
Some renderFlags might have no effect, depending on the text format.
void QwtText::setText (const QString & text, QwtText::TextFormat textFormat = AutoText)
Assign a new text content
Parameters:
text Text content
textFormat Text format
See also:
text()
void QwtText::setTextEngine (QwtText::TextFormat format, QwtTextEngine * engine) [static]
Assign/Replace a text engine for a text format
With setTextEngine it is possible to extend Qwt with other types of text formats.
For QwtText::PlainText it is not allowed to assign a engine == NULL.
Parameters:
format Text format
engine Text engine
See also:
QwtMathMLTextEngine
Warning:
Using QwtText::AutoText does nothing.
bool QwtText::testLayoutAttribute (LayoutAttribute attribute) const
Test a layout attribute
Parameters:
attribute Layout attribute
Returns:
true, if attribute is enabled
See also:
setLayoutAttribute()
bool QwtText::testPaintAttribute (PaintAttribute attribute) const
Test a paint attribute
Parameters:
attribute Paint attribute
Returns:
true, if attribute is enabled
See also:
setPaintAttribute()
QString QwtText::text () const
Returns:
Text as QString.
See also:
setText()
const QwtTextEngine * QwtText::textEngine (const QString & text, QwtText::TextFormat format = AutoText)
[static]
Find the text engine for a text format
In case of QwtText::AutoText the first text engine (beside QwtPlainTextEngine) is returned, where
QwtTextEngine::mightRender returns true. If there is none QwtPlainTextEngine is returned.
If no text engine is registered for the format QwtPlainTextEngine is returnd.
Parameters:
text Text, needed in case of AutoText
format Text format
Returns:
Corresponding text engine
const QwtTextEngine * QwtText::textEngine (QwtText::TextFormat format) [static]
Find the text engine for a text format. textEngine can be used to find out if a text format is supported.
Parameters:
format Text format
Returns:
The text engine, or NULL if no engine is available.
QSizeF QwtText::textSize (const QFont & defaultFont = QFont()) const
Returns the size, that is needed to render text
Parameters:
defaultFont Font of the text
Returns:
Calculated size
QColor QwtText::usedColor (const QColor & defaultColor) const
Return the color of the text, if it has one. Otherwise return defaultColor.
Parameters:
defaultColor Default color
Returns:
Color used for drawing the text
See also:
setColor(), color(), PaintAttributes
QFont QwtText::usedFont (const QFont & defaultFont) const
Return the font of the text, if it has one. Otherwise return defaultFont.
Parameters:
defaultFont Default font
Returns:
Font used for drawing the text
See also:
setFont(), font(), PaintAttributes
Author
Generated automatically by Doxygen for Qwt User's Guide from the source code.
Version 6.1.4 Wed Jan 2 2019 QwtText(3)