Man page - qwtplotmarker(3)

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Manual

QwtPlotMarker

NAME

QwtPlotMarker - A class for drawing markers.

SYNOPSIS

#include <qwt_plot_marker.h>

Inherits QwtPlotItem .

Public Types

enum LineStyle { NoLine , HLine , VLine , Cross }

Public Member Functions

QwtPlotMarker (const QString & title =QString())
Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine .
QwtPlotMarker (const QwtText & title )
Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine .
virtual ˜QwtPlotMarker ()
Destructor.
virtual int rtti () const
double xValue () const
Return x Value.
double yValue () const
Return y Value.
QPointF value () const
Return Value.
void setXValue (double)
Set X Value.
void setYValue (double)
Set Y Value.
void setValue (double, double)
Set Value.
void setValue (const QPointF &)
Set Value.
void setLineStyle ( LineStyle )
Set the line style.
LineStyle lineStyle () const
void setLinePen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
void setLinePen (const QPen &)
const QPen & linePen () const
void setSymbol (const QwtSymbol *)
Assign a symbol.
const QwtSymbol * symbol () const
void setLabel (const QwtText &)
Set the label.
QwtText label () const
void setLabelAlignment (Qt::Alignment)
Set the alignment of the label.
Qt::Alignment labelAlignment () const
void setLabelOrientation (Qt::Orientation)
Set the orientation of the label.
Qt::Orientation labelOrientation () const
void setSpacing (int)
Set the spacing.
int spacing () const
virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
virtual QRectF boundingRect () const
virtual QwtGraphic legendIcon (int index, const QSizeF &) const

Protected Member Functions

virtual void drawLines (QPainter *, const QRectF &, const QPointF &) const
virtual void drawLabel (QPainter *, const QRectF &, const QPointF &) 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 setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.

With setLabel() , a label can be assigned to the marker. The 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 Qt::AlignLeft | Qt::AlignTop.

Note:

QwtPlotTextLabel is intended to align a text label according to the geometry of canvas ( unrelated to plot coordinates )

Member Enumeration Documentation

enum QwtPlotMarker::LineStyle

Line styles.

See also:

setLineStyle() , lineStyle()

Enumerator

	NoLine		No line.
	HLine		A horizontal line.
	VLine		A vertical line.
	Cross		A crosshair.

Member Function Documentation

QRectF QwtPlotMarker::boundingRect () const [virtual]

Returns:

An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note:

A width or height < 0.0 is ignored by the autoscaler

Reimplemented from QwtPlotItem .

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

Draw the marker

Parameters:

painter Painter
xMap x Scale Map
yMap y Scale Map
canvasRect Contents rectangle of the canvas in painter coordinates

Implements QwtPlotItem .

void QwtPlotMarker::drawLabel (QPainter * painter, const QRectF &canvasRect, const QPointF & pos) const [protected], [virtual]

Align and draw the text label of the marker

Parameters:

painter Painter
canvasRect Contents rectangle of the canvas in painter coordinates
pos Position of the marker, translated into widget coordinates

See also:

drawLabel() , QwtSymbol::drawSymbol()

void QwtPlotMarker::drawLines (QPainter * painter, const QRectF &canvasRect, const QPointF & pos) const [protected], [virtual]

Draw the lines marker

Parameters:

painter Painter
canvasRect Contents rectangle of the canvas in painter coordinates
pos Position of the marker, translated into widget coordinates

See also:

drawLabel() , QwtSymbol::drawSymbol()

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()

QwtGraphic QwtPlotMarker::legendIcon (int index, const QSizeF & size) const[virtual]

Returns:

Icon representing the marker on the legend

Parameters:

index Index of the legend entry ( usually there is only one )
size Icon size

See also:

setLegendIconSize() , legendData()

Reimplemented from QwtPlotItem .

const QPen & QwtPlotMarker::linePen () const

Returns:

the line pen

See also:

setLinePen()

QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle () const

Returns:

the line style

See also:

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.

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 QColor & color, qreal width = 0.0,Qt::PenStyle style = Qt::SolidLine)

Build and assign a line pen

In Qt5 the default pen width is 1.0 ( 0.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() ). This method has been introduced to hide this incompatibility.

Parameters:

color Pen color
width Pen width
style Pen style

See also:

pen(), brush()

void QwtPlotMarker::setLinePen (const QPen & pen)

Specify a pen for the line.

Parameters:

pen New pen

See also:

linePen()

void QwtPlotMarker::setLineStyle (LineStyle style)

Set the line style.

Parameters:

style Line style.

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 * symbol)

Assign a symbol.

Parameters:

symbol New symbol

See also:

symbol()

int QwtPlotMarker::spacing () const

Returns:

the spacing

See also:

setSpacing()

const QwtSymbol * QwtPlotMarker::symbol () const

Returns:

the symbol

See also:

setSymbol() , QwtSymbol

Author

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