Man page - qwtplotgrid(3)

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Manual

QwtPlotGrid

NAME

QwtPlotGrid - 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, constQwtScaleMap & 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, constQwtScaleDiv & 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

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