QwtPlotGrid Class Reference

A class which draws a coordinate grid. More...

#include <qwt_plot_grid.h>

Inheritance diagram for QwtPlotGrid:
Inheritance graph
[legend]

List of all members.

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 QwtScaleDivxScaleDiv () const
void setYDiv (const QwtScaleDiv &sy)
const QwtScaleDivyScaleDiv () 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 ( 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 (  )  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(), QwtPainter::scaledPen()
void QwtPlotGrid::setMinPen ( const QPen &  pen  ) 

Assign a pen for the minor gridlines

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

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 (  )  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
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