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

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 QRectF &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 QRectF &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 (booltf)

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 (booltf)

Enable or disable minor vertical gridlines. Parameters:
tf Enable (true) or disable
See also:
enableX()
 

void QwtPlotGrid::enableY (booltf)

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 (booltf)

Enable or disable minor horizontal gridlines. Parameters:
tf Enable (true) or disable
See also:
enableY()
 

const QPen & QwtPlotGrid::majPen () const Returns:

the pen for the major gridlines
See also:
setMajPen(), setMinPen(), setPen()
 

const QPen & QwtPlotGrid::minPen () const Returns:

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

Parameters:
pen Pen
See also:
majPen(), setMinPen(), setPen()
 

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

Parameters:
pen Pen
See also:
minPen(), setMajPen(), setPen()
 

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

Parameters:
pen Pen
See also:
setMajPen(), setMinPen()
 

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 gridlines are enabled
See also:
enableX()
 

bool QwtPlotGrid::xMinEnabled () const Returns:

true if minor vertical gridlines 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 gridlines are enabled
See also:
enableY()
 

bool QwtPlotGrid::yMinEnabled () const Returns:

true if minor horizontal gridlines are enabled
See also:
enableYMin()
 

const QwtScaleDiv & QwtPlotGrid::yScaleDiv () const Returns:

the scale division of the y axis
 
 

Author

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Fri Apr 15 2011 Version 6.0.0