QwtPlotZoneItem(3) Qwt User's Guide QwtPlotZoneItem(3)

QwtPlotZoneItem - A plot item, which displays a zone.

#include <qwt_plot_zoneitem.h>

Inherits QwtPlotItem.


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

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. 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()

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.

Returns:

Brush used to fill the zone

See also:

setPen(), brush()

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()

Returns:

Orientation of the zone

See also:

setOrientation()

Returns:

Pen used to draw the border lines

See also:

setPen(), brush()

Returns:

QwtPlotItem::Rtti_PlotZone

Reimplemented from QwtPlotItem.

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

Parameters:

brush Brush

See also:

pen(), setBrush()

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()

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()

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()

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()

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

Parameters:

pen Pen

See also:

pen(), setBrush()

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Wed Jan 2 2019 Version 6.1.4