QwtPlotGrid - Man Page

A class which draws a coordinate grid.

Synopsis

#include <qwt_plot_grid.h>

Inherits QwtPlotItem.

Public Member Functions

QwtPlotGrid ()
Enables major grid, disables minor grid.
virtual ~QwtPlotGrid ()
Destructor.
virtual int rtti () const
void enableX (bool)
Enable or disable vertical grid lines.
bool xEnabled () const
void enableY (bool)
Enable or disable horizontal grid lines.
bool yEnabled () const
void enableXMin (bool)
Enable or disable minor vertical grid lines.
bool xMinEnabled () const
void enableYMin (bool)
Enable or disable minor horizontal grid lines.
bool yMinEnabled () const
void setXDiv (const QwtScaleDiv &)
const QwtScaleDiv & xScaleDiv () const
void setYDiv (const QwtScaleDiv &)
const QwtScaleDiv & yScaleDiv () const
void setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
void setPen (const QPen &)
void setMajorPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
void setMajorPen (const QPen &)
const QPen & majorPen () const
void setMinorPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
void setMinorPen (const QPen &)
const QPen & minorPen () const
virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const
Draw the grid.
virtual void updateScaleDiv (const QwtScaleDiv &xScaleDiv, const QwtScaleDiv &yScaleDiv)

Additional Inherited Members

Detailed Description

A class which draws a coordinate grid.

The QwtPlotGrid class can be used to draw a coordinate grid. A coordinate grid consists of major and minor vertical and horizontal grid lines. The locations of the grid lines are determined by the X and Y scale divisions which can be assigned with setXDiv() and setYDiv(). The draw() member draws the grid within a bounding rectangle.

Member Function Documentation

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

Draw the grid. The grid is drawn into the bounding rectangle such that grid lines begin and end at the rectangle's borders. The X and Y maps are used to map the scale divisions into the drawing region screen.

Parameters

painter Painter
xMap X axis map
yMap Y axis
canvasRect Contents rectangle of the plot canvas

Implements QwtPlotItem.

void QwtPlotGrid::enableX (bool on)

Enable or disable vertical grid lines.

Parameters

on Enable (true) or disable

See also

Minor grid lines can be enabled or disabled with enableXMin()

void QwtPlotGrid::enableXMin (bool on)

Enable or disable minor vertical grid lines.

Parameters

on Enable (true) or disable

See also

enableX()

void QwtPlotGrid::enableY (bool on)

Enable or disable horizontal grid lines.

Parameters

on Enable (true) or disable

See also

Minor grid lines can be enabled or disabled with enableYMin()

void QwtPlotGrid::enableYMin (bool on)

Enable or disable minor horizontal grid lines.

Parameters

on Enable (true) or disable

See also

enableY()

const QPen & QwtPlotGrid::majorPen () const

Returns

the pen for the major grid lines

See also

setMajorPen(), setMinorPen(), setPen()

const QPen & QwtPlotGrid::minorPen () const

Returns

the pen for the minor grid lines

See also

setMinorPen(), setMajorPen(), setPen()

int QwtPlotGrid::rtti () const [virtual]

Returns

QwtPlotItem::Rtti_PlotGrid

Reimplemented from QwtPlotItem.

void QwtPlotGrid::setMajorPen (const QColor & color, qreal width = 0.0, Qt::PenStyle style = Qt::SolidLine)

Build and assign a pen for both major grid lines

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 QwtPlotGrid::setMajorPen (const QPen & pen)

Assign a pen for the major grid lines

Parameters

pen Pen

See also

majorPen(), setMinorPen(), setPen()

void QwtPlotGrid::setMinorPen (const QColor & color, qreal width = 0.0, Qt::PenStyle style = Qt::SolidLine)

Build and assign a pen for the minor grid lines

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 QwtPlotGrid::setMinorPen (const QPen & pen)

Assign a pen for the minor grid lines

Parameters

pen Pen

See also

minorPen(), setMajorPen(), setPen()

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

Build and assign a pen for both major and minor grid lines

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 QwtPlotGrid::setPen (const QPen & pen)

Assign a pen for both major and minor grid lines

Parameters

pen Pen

See also

setMajorPen(), setMinorPen()

void QwtPlotGrid::setXDiv (const QwtScaleDiv & scaleDiv)

Assign an x axis scale division

Parameters

scaleDiv Scale division

void QwtPlotGrid::setYDiv (const QwtScaleDiv & scaleDiv)

Assign a y axis division

Parameters

scaleDiv Scale division

void QwtPlotGrid::updateScaleDiv (const QwtScaleDiv & xScaleDiv, const QwtScaleDiv & yScaleDiv) [virtual]

Update the grid to changes of the axes scale division

Parameters

xScaleDiv Scale division of the x-axis
yScaleDiv Scale division of the y-axis

See also

QwtPlot::updateAxes()

Reimplemented from QwtPlotItem.

bool QwtPlotGrid::xEnabled () const

Returns

true if vertical grid lines are enabled

See also

enableX()

bool QwtPlotGrid::xMinEnabled () const

Returns

true if minor vertical grid lines are enabled

See also

enableXMin()

const QwtScaleDiv & QwtPlotGrid::xScaleDiv () const

Returns

the scale division of the x axis

bool QwtPlotGrid::yEnabled () const

Returns

true if horizontal grid lines are enabled

See also

enableY()

bool QwtPlotGrid::yMinEnabled () const

Returns

true if minor horizontal grid lines are enabled

See also

enableYMin()

const QwtScaleDiv & QwtPlotGrid::yScaleDiv () const

Returns

the scale division of the y axis

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.

Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide