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QwtGrid Class Reference

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

#include <qwt_grid.h>

Inheritance diagram for QwtGrid::

QwtPlotGrid List of all members.

Public Methods

 QwtGrid ()
virtual ~QwtGrid ()
virtual const QwtGrid & operator= (const QwtGrid &g)
virtual void draw (QPainter *p, const QRect &r, const QwtDiMap &mx, const QwtDiMap &my)
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

Protected Methods

virtual void gridChanged ()

Detailed Description

A class which draws a coordinate grid.

The QwtGrid 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 QwtGrid::setXDiv and QwtGrid::setYDiv() The draw() member draws the grid within a bounding rectangle.


Constructor & Destructor Documentation

QwtGrid::QwtGrid  
 

Enables major grid, disables minor grid.

QwtGrid::~QwtGrid   [virtual]
 

dtor.


Member Function Documentation

void QwtGrid::draw QPainter *    p,
const QRect &    r,
const QwtDiMap   mx,
const QwtDiMap   my
[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:
p  Painter
r  Bounding rectangle
mx  X axis map
my  Y axis

void QwtGrid::enableX bool    tf
 

Enable or disable vertical gridlines.

Parameters:
tf  Enable (TRUE) or disable
See also:
Minor gridlines can be enabled or disabled with QwtGrid::enableXMin()

void QwtGrid::enableXMin bool    tf
 

Enable or disable minor vertical gridlines.

Parameters:
tf  Enable (TRUE) or disable
See also:
QwtGrid::enableX()

void QwtGrid::enableY bool    tf
 

Enable or disable horizontal gridlines.

Parameters:
tf  Enable (TRUE) or disable
See also:
Minor gridlines can be enabled or disabled with QwtGrid::enableYMin()

void QwtGrid::enableYMin bool    tf
 

Enable or disable minor horizontal gridlines.

Parameters:
tf  Enable (TRUE) or disable
See also:
QwtGrid::enableY()

void QwtGrid::gridChanged   [protected, virtual]
 

Notify a change of attributes.

This virtual function is called when an attribute of the grid has changed. It can be redefined by derived classes. The default implementation does nothing.

Reimplemented in QwtPlotGrid.

const QPen & QwtGrid::majPen   const
 

Returns:
the pen for the major gridlines
See also:
QwtGrid::setMinPen, QwtGrid::setPen

const QPen & QwtGrid::minPen   const
 

Returns:
the pen for the minor gridlines
See also:
QwtGrid::setMinPen, QwtGrid::setPen

const QwtGrid & QwtGrid::operator= const QwtGrid &    g [virtual]
 

Assignment operator.

Parameters:
g  Grid to be assigned

void QwtGrid::setMajPen const QPen &    p
 

Assign a pen for the major gridlines.

Parameters:
p  Pen

void QwtGrid::setMinPen const QPen &    p
 

Assign a pen for the minor gridlines.

Parameters:
p  Pen

void QwtGrid::setPen const QPen &    p
 

Assign a pen for both major and minor gridlines.

Parameters:
p  Pen

void QwtGrid::setXDiv const QwtScaleDiv   sx
 

Assign an x axis scale division.

Parameters:
sx  Scale division
Warning:
QwtGrid uses implicit sharing (see Qt Manual) for the scale divisions.
See also:
QwtScaleDiv

void QwtGrid::setYDiv const QwtScaleDiv   sy
 

Assign a y axis division.

Parameters:
sy  Scale division
Warning:
QwtGrid uses implicit sharing (see Qt Manual) for the scale divisions.
See also:
QwtScaleDiv

bool QwtGrid::xEnabled   const
 

Returns:
TRUE if vertical gridlines are enabled
See also:
QwtGrid::enableX

bool QwtGrid::xMinEnabled   const
 

Returns:
TRUE if minor vertical gridlines are enabled
See also:
QwtGrid::enableXMin

const QwtScaleDiv & QwtGrid::xScaleDiv   const
 

Returns:
the scale division of the x axis

bool QwtGrid::yEnabled   const
 

Returns:
TRUE if horizontal gridlines are enabled
See also:
QwtGrid::enableY

bool QwtGrid::yMinEnabled   const
 

Returns:
TRUE if minor horizontal gridlines are enabled
See also:
QwtGrid::enableYMin

const QwtScaleDiv & QwtGrid::yScaleDiv   const
 

Returns:
the scale division of the y axis


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