QwtPlotZoneItem (3) Linux Manual Page

QwtPlotZoneItem –

A plot item, which displays a zone.

Synopsis

#include <qwt_plot_zoneitem.h>

Inherits QwtPlotItem.

Public Member Functions

QwtPlotZoneItem ()
Constructor.
virtual ~QwtPlotZoneItem ()
Destructor.
virtual int rtti () const

void setOrientation (Qt::Orientation)
Set the orientation of the zone.
Qt::Orientation orientation ()

void setInterval (double min, double max)

void setInterval (const QwtInterval &)

QwtInterval interval () const

void setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)

void setPen (const QPen &)
Assign a pen.
const QPen & pen () const

void setBrush (const QBrush &)
Assign a brush.
const QBrush & brush () const

virtual void draw (QPainter *, const QwtScaleMap &, const QwtScaleMap &, const QRectF &) const

virtual QRectF boundingRect () const

Additional Inherited Members

Detailed Description

A plot item, which displays a zone.

A horizontal zone highlights an interval of the y axis – a vertical zone an interval of the x axis – and is unbounded in the opposite direction. It is filled with a brush and its border lines are optionally displayed with a pen.

Note:

For displaying an area that is bounded for x and y coordinates use QwtPlotShapeItem

Constructor & Destructor Documentation

QwtPlotZoneItem::QwtPlotZoneItem () [explicit]

Constructor. Initializes the zone with no pen and a semi transparent gray brush

Sets the following item attributes:

•

QwtPlotItem::AutoScale: false

•

QwtPlotItem::Legend: false

The z value is initialized by 5

See Also:

QwtPlotItem::setItemAttribute(), QwtPlotItem::setZ()

Member Function Documentation

QRectF QwtPlotZoneItem::boundingRect () const [virtual]

The bounding rectangle is build from the interval in one direction and something invalid for the opposite direction.

Returns:

An invalid rectangle with valid boundaries in one direction

Reimplemented from QwtPlotItem.

const QBrush & QwtPlotZoneItem::brush () const

Returns:

Brush used to fill the zone

See Also:

setPen(), brush()

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

Draw the zone

Parameters:

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

Implements QwtPlotItem.

QwtInterval QwtPlotZoneItem::interval () const

Returns:

Zone interval

See Also:

setInterval(), orientation()

Qt::Orientation QwtPlotZoneItem::orientation ()

Returns:

Orientation of the zone

See Also:

setOrientation()

const QPen & QwtPlotZoneItem::pen () const

Returns:

Pen used to draw the border lines

See Also:

setPen(), brush()

int QwtPlotZoneItem::rtti () const [virtual]

Returns:

QwtPlotItem::Rtti_PlotZone

Reimplemented from QwtPlotItem.

void QwtPlotZoneItem::setBrush (const QBrush &brush)

Assign a brush. The brush is used to fill the zone

Parameters:

brush Brush

See Also:

pen(), setBrush()

void QwtPlotZoneItem::setInterval (doublemin, doublemax)

Set the interval of the zone

For a horizontal zone the interval is related to the y axis, for a vertical zone it is related to the x axis.

Parameters:

min Minimum of the interval
max Maximum of the interval

See Also:

interval(), setOrientation()

void QwtPlotZoneItem::setInterval (const QwtInterval &interval)

Set the interval of the zone

For a horizontal zone the interval is related to the y axis, for a vertical zone it is related to the x axis.

Parameters:

interval Zone interval

See Also:

interval(), setOrientation()

void QwtPlotZoneItem::setOrientation (Qt::Orientationorientation)

Set the orientation of the zone. A horizontal zone highlights an interval of the y axis, a vertical zone of the x axis. It is unbounded in the opposite direction.

See Also:

orientation(), QwtPlotItem::setAxes()

void QwtPlotZoneItem::setPen (const QColor &color, qrealwidth = 0.0, Qt::PenStylestyle = Qt::SolidLine)

Build and assign a 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 QwtPlotZoneItem::setPen (const QPen &pen)

Assign a pen. The pen is used to draw the border lines of the zone

Parameters:

pen Pen

See Also:

pen(), setBrush()

Author

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