QwtMarker(3)

NAME
QwtMarker - A class for drawing markers.

SYNOPSIS

#include <qwt_marker.h>

Inherited by QwtPlotMarker.

  Public Types
enum LineStyle { NoLine, HLine, VLine, Cross }

  Public Methods
QwtMarker ()
virtual ~QwtMarker ()
const QwtMarker & operator= (const QwtMarker &)
void setLineStyle (LineStyle st)
LineStyle lineStyle () const
void setSymbol (const QwtSymbol &s)
const QwtSymbol & symbol () const
void setLabel (const QString &txt)
const QString & label () const
void setLabelAlignment (int align)
int labelAlignment () const
void setLabelPen (const QPen &p)
const QPen & labelPen () const
void setLinePen (const QPen &p)
const QPen & linePen () const
void setFont (const QFont &f)
const QFont & font () const
virtual void draw (QPainter *p, int x, int y, const QRect &r)

  Protected Methods
virtual void markerChanged ()

DETAILED DESCRIPTION

A class for drawing markers.

 A marker can be a horizontal line, a vertical line, a symbol, a label or any combination of them, which can be drawn around a center point inside a bounding rectangle.

The QwtMarker::setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.

With QwtMarker::setLabel(), a label can be assigned to the marker. The QwtMarker::setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in qwindefs.h (see Qt documentation) are valid. The interpretation of the alignment depends on the marker's line style. The alignment refers to the center point of the marker, which means, for example, that the label would be printed left above the center point if the alignment was set to AlignLeft|AlignTop.

MEMBER ENUMERATION DOCUMENTATION

  enum QwtMarker::LineStyle

Line styles.

See also:
QwtMarker::setLineStyle, QwtMarker::lineStyle

CONSTRUCTOR & DESTRUCTOR DOCUMENTATION

  QwtMarker::QwtMarker ()

Sets alignment to Qt::AlignCenter, and style to NoLine.

  QwtMarker::~QwtMarker () [virtual]

Destructor.

MEMBER FUNCTION DOCUMENTATION

  void QwtMarker::draw (QPainter * p, int x, int y, const QRect & r) [virtual]

Draw the marker.

Parameters:

p   Painter

x   X position

y   Y position

r   Bounding rectangle

  const QFont & QwtMarker::font () const

Returns:
the font used for the label

See also:
QwtMarker::setFont()

  const QString & QwtMarker::label () const

Returns:
the label

See also:
QwtMarker::setLabel()

  int QwtMarker::labelAlignment () const

Returns:
the label alignment

See also:
QwtMarker::setLabelAlignment()

  const QPen & QwtMarker::labelPen () const

Returns:
the label's pen

See also:
QwtMarker::setLabelPen()

  const QPen & QwtMarker::linePen () const

Returns:
the line pen

See also:
QwtMarker::setLinePen()

  QwtMarker::LineStyle QwtMarker::lineStyle () const

Returns:
the line style

See also:
For a description of line styles, see QwtMarker::setLineStyle()

  void QwtMarker::markerChanged () [protected, virtual]

Notify a change of parameters.

 This virtual function is called when a marker property has been changed and redrawing is advisable. It can be reimplemented by derived classes. The default implementation does nothing.

Reimplemented in QwtPlotMarker.

  const QwtMarker & QwtMarker::operator= (const QwtMarker & m)

Assignment operator.

Parameters:

m   Marker

  void QwtMarker::setFont (const QFont & f)

Specify the font for the label.

Parameters:

f   New font

See also:
QwtMarker::font()

  void QwtMarker::setLabel (const QString & txt)

Set the label.

Parameters:

txt label text

See also:
QwtMarker::label()

  void QwtMarker::setLabelAlignment (int align)

Set the alignment of the label.

 The alignment determines where the label is drawn relative to the marker's position.

Parameters:

align
    Alignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter.

See also:
QwtMarker::labelAlignment()

  void QwtMarker::setLabelPen (const QPen & p)

Specify a pen for the label.

Parameters:

p   New pen

See also:
QwtMarker::labelPen()

  void QwtMarker::setLinePen (const QPen & p)

Specify a pen for the line.

Parameters:

p   New pen

See also:
QwtMarker::linePen()

  void QwtMarker::setLineStyle (QwtMarker::LineStyle st)

Set the line style.

Parameters:

st  Line style. Can be one of QwtMarker::NoLine, QwtMarker::HLine, QwtMarker::VLine or QwtMarker::Cross

See also:
QwtMarker::lineStyle()

  void QwtMarker::setSymbol (const QwtSymbol & s)

Assign a symbol.

Parameters:

s   New symbol

See also:
QwtSymbol, QwtMarker::symbol()

  const QwtSymbol & QwtMarker::symbol () const

Returns:
the symbol

See also:
QwtMarker::setSymbol(), QwtSymbol

AUTHOR

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