Qwt User's Guide: QwtPlotMarker Class Reference

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QwtPlotMarker Class Reference

A class for drawing markers. More...

#include <qwt_plot_marker.h>

Inheritance diagram for QwtPlotMarker:
[legend]

List of all members.

Public Types

enum  LineStyle {
  NoLine,
  HLine,
  VLine,
  Cross
}

Public Member Functions

 QwtPlotMarker ()
virtual ~QwtPlotMarker ()
virtual int rtti () const
double xValue () const
double yValue () const
QwtDoublePoint value () const
void setXValue (double)
void setYValue (double)
void setValue (double, double)
void setValue (const QwtDoublePoint &)
void setLineStyle (LineStyle st)
LineStyle lineStyle () const
void setLinePen (const QPen &p)
const QPen & linePen () const
void setSymbol (const QwtSymbol &s)
const QwtSymbol & symbol () const
void setLabel (const QwtText &)
QwtText label () const
void setLabelAlignment (Qt::Alignment)
Qt::Alignment labelAlignment () const
void setLabelOrientation (Qt::Orientation)
Qt::Orientation labelOrientation () const
void setSpacing (int)
int spacing () const
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const
virtual QwtDoubleRect boundingRect () const

Protected Member Functions

void drawAt (QPainter *, const QRect &, const QPoint &) const

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

With QwtPlotMarker::setLabel(), a label can be assigned to the marker. The QwtPlotMarker::setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in Qt::AlignmentFlags (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 QwtPlotMarker::LineStyle

Line styles.

See also:
setLineStyle(), lineStyle()

Constructor & Destructor Documentation

QwtPlotMarker::QwtPlotMarker (  )  [explicit]

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

QwtPlotMarker::~QwtPlotMarker (  )  [virtual]

Destructor.

Member Function Documentation

QwtDoubleRect QwtPlotMarker::boundingRect (  )  const [virtual]
Returns:
An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)

Reimplemented from QwtPlotItem.

void QwtPlotMarker::draw ( QPainter *  painter,
const QwtScaleMap &  xMap,
const QwtScaleMap &  yMap,
const QRect &  canvasRect 
) const [virtual]

Draw the marker

Parameters:
painter Painter
xMap x Scale Map
yMap y Scale Map
canvasRect Contents rect of the canvas in painter coordinates

Implements QwtPlotItem.

void QwtPlotMarker::drawAt ( QPainter *  painter,
const QRect &  canvasRect,
const QPoint &  pos 
) const [protected]

Draw the marker at a specific position

Parameters:
painter Painter
canvasRect Contents rect of the canvas in painter coordinates
pos Position of the marker in painter coordinates
QwtText QwtPlotMarker::label (  )  const
Returns:
the label
See also:
setLabel()
Qt::Alignment QwtPlotMarker::labelAlignment (  )  const
Returns:
the label alignment
See also:
setLabelAlignment(), setLabelOrientation()
Qt::Orientation QwtPlotMarker::labelOrientation (  )  const
Returns:
the label orientation
See also:
setLabelOrientation(), labelAlignment()
const QPen & QwtPlotMarker::linePen (  )  const
Returns:
the line pen
See also:
setLinePen()
QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle (  )  const
Returns:
the line style
See also:
For a description of line styles, see QwtPlotMarker::setLineStyle()
int QwtPlotMarker::rtti (  )  const [virtual]
Returns:
QwtPlotItem::Rtti_PlotMarker

Reimplemented from QwtPlotItem.

void QwtPlotMarker::setLabel ( const QwtText &  label  ) 

Set the label.

Parameters:
label label text
See also:
label()
void QwtPlotMarker::setLabelAlignment ( Qt::Alignment  align  ) 

Set the alignment of the label.

In case of QwtPlotMarker::HLine the alignment is relative to the y position of the marker, but the horizontal flags correspond to the canvas rectangle. In case of QwtPlotMarker::VLine the alignment is relative to the x position of the marker, but the vertical flags correspond to the canvas rectangle.

In all other styles the alignment is relative to the marker's position.

Parameters:
align Alignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter.
See also:
labelAlignment(), labelOrientation()
void QwtPlotMarker::setLabelOrientation ( Qt::Orientation  orientation  ) 

Set the orientation of the label.

When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ).

Parameters:
orientation Orientation of the label
See also:
labelOrientation(), setLabelAlignment()
void QwtPlotMarker::setLinePen ( const QPen &  pen  ) 

Specify a pen for the line.

The width of non cosmetic pens is scaled according to the resolution of the paint device.

Parameters:
pen New pen
See also:
linePen(), QwtPainter::scaledPen()
void QwtPlotMarker::setLineStyle ( QwtPlotMarker::LineStyle  st  ) 

Set the line style.

Parameters:
st Line style. Can be one of QwtPlotMarker::NoLine, HLine, VLine or Cross
See also:
lineStyle()
void QwtPlotMarker::setSpacing ( int  spacing  ) 

Set the spacing.

When the label is not centered on the marker position, the spacing is the distance between the position and the label.

Parameters:
spacing Spacing
See also:
spacing(), setLabelAlignment()
void QwtPlotMarker::setSymbol ( const QwtSymbol &  s  ) 

Assign a symbol.

Parameters:
s New symbol
See also:
symbol()
void QwtPlotMarker::setValue ( const QwtDoublePoint &  pos  ) 

Set Value.

void QwtPlotMarker::setValue ( double  x,
double  y 
)

Set Value.

void QwtPlotMarker::setXValue ( double  x  ) 

Set X Value.

void QwtPlotMarker::setYValue ( double  y  ) 

Set Y Value.

int QwtPlotMarker::spacing (  )  const
Returns:
the spacing
See also:
setSpacing()
const QwtSymbol & QwtPlotMarker::symbol (  )  const
Returns:
the symbol
See also:
setSymbol(), QwtSymbol
QwtDoublePoint QwtPlotMarker::value (  )  const

Return Value.

double QwtPlotMarker::xValue (  )  const

Return x Value.

double QwtPlotMarker::yValue (  )  const

Return y Value.

Generated on Wed Sep 2 18:37:26 2009 for Qwt User's Guide by  doxygen 1.6.1
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