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QwtPlotGrid

NAME

QwtPlotGrid -

A class which draws a coordinate grid.

SYNOPSIS

#include <qwt_plot_grid.h>

Inherits QwtPlotItem.

Public Member Functions

QwtPlotGrid ()

virtual ~QwtPlotGrid ()

virtual int rtti () const

void enableX (bool tf)

bool xEnabled () const

void enableY (bool tf)

bool yEnabled () const

void enableXMin (bool tf)

bool xMinEnabled () const

void enableYMin (bool tf)

bool yMinEnabled () const

void setXDiv (const QwtScaleDiv &sx)

const QwtScaleDiv & xScaleDiv () const

void setYDiv (const QwtScaleDiv &sy)

const QwtScaleDiv & yScaleDiv () const

void setPen (const QPen &p)

void setMajPen (const QPen &p)

const QPen & majPen () const

void setMinPen (const QPen &p)

const QPen & minPen () const

virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &rect) const

virtual void updateScaleDiv (const QwtScaleDiv &xMap, const QwtScaleDiv &yMap)

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 gridlines. The locations of the gridlines 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.

Constructor & Destructor Documentation

QwtPlotGrid::QwtPlotGrid () [explicit]

Enables major grid, disables minor grid.

QwtPlotGrid::~QwtPlotGrid () [virtual]

Destructor.

Member Function Documentation

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

Draw the grid. The grid is drawn into the bounding rectangle such that gridlines 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 rect of the plot canvas

Implements QwtPlotItem.

void QwtPlotGrid::enableX (bool tf)

Enable or disable vertical gridlines. Parameters:

tf Enable (true) or disable

See also:

Minor gridlines can be enabled or disabled with enableXMin()

void QwtPlotGrid::enableXMin (bool tf)

Enable or disable minor vertical gridlines. Parameters:

tf Enable (true) or disable

See also:

enableX()

void QwtPlotGrid::enableY (bool tf)

Enable or disable horizontal gridlines. Parameters:

tf Enable (true) or disable

See also:

Minor gridlines can be enabled or disabled with enableYMin()

void QwtPlotGrid::enableYMin (bool tf)

Enable or disable minor horizontal gridlines. Parameters:

tf Enable (true) or disable

See also:

enableY()

const QPen & QwtPlotGrid::majPen () constReturns:

the pen for the major gridlines

See also:

setMajPen(), setMinPen(), setPen()

const QPen & QwtPlotGrid::minPen () constReturns:

the pen for the minor gridlines

See also:

setMinPen(), setMajPen(), setPen()

int QwtPlotGrid::rtti () const [virtual]Returns:

QwtPlotItem::Rtti_PlotGrid

Reimplemented from QwtPlotItem.

void QwtPlotGrid::setMajPen (const QPen & pen)Assign a pen for the major gridlines

The width of non cosmetic pens is scaled according to the resolution of the paint device.

Parameters:

pen Pen

See also:

majPen(), setMinPen(), setPen(), QwtPainter::scaledPen()

void QwtPlotGrid::setMinPen (const QPen & pen)Assign a pen for the minor gridlines

The width of non cosmetic pens is scaled according to the resolution of the paint device.

Parameters:

pen Pen

See also:

minPen(), setMajPen(), setPen(), QwtPainter::scaledPen()

void QwtPlotGrid::setPen (const QPen & pen)Assign a pen for both major and minor gridlines

The width of non cosmetic pens is scaled according to the resolution of the paint device.

Parameters:

pen Pen

See also:

setMajPen(), setMinPen(), QwtPainter::scaledPen()

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 () constReturns:

true if vertical gridlines are enabled

See also:

enableX()

bool QwtPlotGrid::xMinEnabled () constReturns:

true if minor vertical gridlines are enabled

See also:

enableXMin()

const QwtScaleDiv & QwtPlotGrid::xScaleDiv () constReturns:

the scale division of the x axis

bool QwtPlotGrid::yEnabled () constReturns:

true if horizontal gridlines are enabled

See also:

enableY()

bool QwtPlotGrid::yMinEnabled () constReturns:

true if minor horizontal gridlines are enabled

See also:

enableYMin()

const QwtScaleDiv & QwtPlotGrid::yScaleDiv () constReturns:

the scale division of the y axis

Author

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