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QwtPlotGrid - A class which draws a coordinate grid.

NAME  SYNOPSIS  Public Member Functions  Additional Inherited Members  Detailed Description  Constructor & Destructor Documentation  QwtPlotGrid::QwtPlotGrid () [explicit]  QwtPlotGrid::˜QwtPlotGrid () [virtual]  Member Function Documentation  void QwtPlotGrid::draw (QPainter * painter, const QwtScaleMap & xMap, constQwtScaleMap & yMap, const QRectF & canvasRect) const [override],[virtual]  void QwtPlotGrid::enableX (bool on)  void QwtPlotGrid::enableXMin (bool on)  void QwtPlotGrid::enableY (bool on)  void QwtPlotGrid::enableYMin (bool on)  const QPen & QwtPlotGrid::majorPen () const  const QPen & QwtPlotGrid::minorPen () const  int QwtPlotGrid::rtti () const [override], [virtual]  void QwtPlotGrid::setMajorPen (const QColor & color, qreal width = 0.0,Qt::PenStyle style = Qt::SolidLine)  void QwtPlotGrid::setMajorPen (const QPen & pen)  void QwtPlotGrid::setMinorPen (const QColor & color, qreal width = 0.0,Qt::PenStyle style = Qt::SolidLine)  void QwtPlotGrid::setMinorPen (const QPen & pen)  void QwtPlotGrid::setPen (const QColor & color, qreal width = 0.0,Qt::PenStyle style = Qt::SolidLine)  void QwtPlotGrid::setPen (const QPen & pen)  void QwtPlotGrid::setXDiv (const QwtScaleDiv & scaleDiv)  void QwtPlotGrid::setYDiv (const QwtScaleDiv & scaleDiv)  void QwtPlotGrid::updateScaleDiv (const QwtScaleDiv & xScaleDiv, constQwtScaleDiv & yScaleDiv) [override], [virtual]  bool QwtPlotGrid::xEnabled () const  bool QwtPlotGrid::xMinEnabled () const  const QwtScaleDiv & QwtPlotGrid::xScaleDiv () const  bool QwtPlotGrid::yEnabled () const  bool QwtPlotGrid::yMinEnabled () const  const QwtScaleDiv & QwtPlotGrid::yScaleDiv () const  Author 

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 override
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 override
Draw the grid.
virtual void updateScaleDiv (const QwtScaleDiv &xScaleDiv, const QwtScaleDiv &yScaleDiv) override

Public Member Functions inherited from QwtPlotItem

QwtPlotItem ()
QwtPlotItem (const QString &title)
QwtPlotItem (const QwtText &title)
virtual ˜QwtPlotItem ()
Destroy the QwtPlotItem.
void attach (QwtPlot *plot)
Attach the item to a plot.
void detach ()
This method detaches a QwtPlotItem from any QwtPlot it has been associated with.
QwtPlot * plot () const
Return attached plot.
void setTitle (const QString &title)
void setTitle (const QwtText &title)
const QwtText & title () const
void setItemAttribute (ItemAttribute, bool on=true)
bool testItemAttribute (ItemAttribute) const
void setItemInterest (ItemInterest, bool on=true)
bool testItemInterest (ItemInterest) const
void setRenderHint (RenderHint, bool on=true)
bool testRenderHint (RenderHint) const
void setRenderThreadCount (uint numThreads)
uint renderThreadCount () const
void setLegendIconSize (const QSize &)
QSize legendIconSize () const
double z () const
void setZ (double z)
Set the z value.
void show ()
Show the item.
void hide ()
Hide the item.
virtual void setVisible (bool)
bool isVisible () const
void setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
void setXAxis (QwtAxisId)
QwtAxisId xAxis () const
Return xAxis.
void setYAxis (QwtAxisId)
QwtAxisId yAxis () const
Return yAxis.
virtual void itemChanged ()
virtual void legendChanged ()
virtual QRectF boundingRect () const
virtual void getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
Calculate a hint for the canvas margin.
virtual void updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
Update the item to changes of the legend info.
QRectF scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
Calculate the bounding scale rectangle of 2 maps.
QRectF paintRect (const QwtScaleMap &, const QwtScaleMap &) const
Calculate the bounding paint rectangle of 2 maps.
virtual QList< QwtLegendData > legendData () const
Return all information, that is needed to represent the item on the legend.
virtual QwtGraphic legendIcon (int index, const QSizeF &) const

Additional Inherited Members

Public Types inherited from QwtPlotItem

enum RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotLegend, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotGraphic, Rtti_PlotTradingCurve, Rtti_PlotBarChart, Rtti_PlotMultiBarChart, Rtti_PlotShape, Rtti_PlotTextLabel, Rtti_PlotZone, Rtti_PlotVectorField, Rtti_PlotUserItem = 1000 }
Runtime type information.
enum ItemAttribute { Legend = 0x01, AutoScale = 0x02, Margins = 0x04 }
Plot Item Attributes.
enum ItemInterest { ScaleInterest = 0x01, LegendInterest = 0x02 }
Plot Item Interests.
enum RenderHint { RenderAntialiased = 0x1 }
Render hints.
typedef QFlags< ItemAttribute > ItemAttributes
typedef QFlags< ItemInterest > ItemInterests
typedef QFlags< RenderHint > RenderHints

Protected Member Functions inherited from QwtPlotItem

QwtGraphic defaultIcon (const QBrush &, const QSizeF &) const
Return a default icon from a brush.

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.

Definition at line 33 of file qwt_plot_grid.h.

Constructor & Destructor Documentation

QwtPlotGrid::QwtPlotGrid () [explicit]

Enables major grid, disables minor grid.

Definition at line 48 of file qwt_plot_grid.cpp.

QwtPlotGrid::˜QwtPlotGrid () [virtual]

Destructor.

Definition at line 58 of file qwt_plot_grid.cpp.

Member Function Documentation

void QwtPlotGrid::draw (QPainter * painter, const QwtScaleMap & xMap, constQwtScaleMap & yMap, const QRectF & canvasRect) const [override],[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.

Definition at line 282 of file qwt_plot_grid.cpp.

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()

Definition at line 76 of file qwt_plot_grid.cpp.

void QwtPlotGrid::enableXMin (bool on)

Enable or disable minor vertical grid lines.

Parameters

on Enable (true) or disable

See also

enableX()

Definition at line 108 of file qwt_plot_grid.cpp.

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()

Definition at line 92 of file qwt_plot_grid.cpp.

void QwtPlotGrid::enableYMin (bool on)

Enable or disable minor horizontal grid lines.

Parameters

on Enable (true) or disable

See also

enableY()

Definition at line 124 of file qwt_plot_grid.cpp.

const QPen & QwtPlotGrid::majorPen () const

Returns

the pen for the major grid lines

See also

setMajorPen(), setMinorPen(), setPen()

Definition at line 367 of file qwt_plot_grid.cpp.

const QPen & QwtPlotGrid::minorPen () const

Returns

the pen for the minor grid lines

See also

setMinorPen(), setMajorPen(), setPen()

Definition at line 376 of file qwt_plot_grid.cpp.

int QwtPlotGrid::rtti () const [override], [virtual]

Returns

QwtPlotItem::Rtti_PlotGrid

Reimplemented from QwtPlotItem.

Definition at line 64 of file qwt_plot_grid.cpp.

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()

Definition at line 212 of file qwt_plot_grid.cpp.

void QwtPlotGrid::setMajorPen (const QPen & pen)

Assign a pen for the major grid lines

Parameters

pen Pen

See also

majorPen(), setMinorPen(), setPen()

Definition at line 223 of file qwt_plot_grid.cpp.

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()

Definition at line 247 of file qwt_plot_grid.cpp.

void QwtPlotGrid::setMinorPen (const QPen & pen)

Assign a pen for the minor grid lines

Parameters

pen Pen

See also

minorPen(), setMajorPen(), setPen()

Definition at line 258 of file qwt_plot_grid.cpp.

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()

Definition at line 176 of file qwt_plot_grid.cpp.

void QwtPlotGrid::setPen (const QPen & pen)

Assign a pen for both major and minor grid lines

Parameters

pen Pen

See also

setMajorPen(), setMinorPen()

Definition at line 187 of file qwt_plot_grid.cpp.

void QwtPlotGrid::setXDiv (const QwtScaleDiv & scaleDiv)

Assign an x axis scale division

Parameters

scaleDiv Scale division

Definition at line 140 of file qwt_plot_grid.cpp.

void QwtPlotGrid::setYDiv (const QwtScaleDiv & scaleDiv)

Assign a y axis division

Parameters

scaleDiv Scale division

Definition at line 154 of file qwt_plot_grid.cpp.

void QwtPlotGrid::updateScaleDiv (const QwtScaleDiv & xScaleDiv, constQwtScaleDiv & yScaleDiv) [override], [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.

Definition at line 438 of file qwt_plot_grid.cpp.

bool QwtPlotGrid::xEnabled () const

Returns

true if vertical grid lines are enabled

See also

enableX()

Definition at line 385 of file qwt_plot_grid.cpp.

bool QwtPlotGrid::xMinEnabled () const

Returns

true if minor vertical grid lines are enabled

See also

enableXMin()

Definition at line 394 of file qwt_plot_grid.cpp.

const QwtScaleDiv & QwtPlotGrid::xScaleDiv () const

Returns

the scale division of the x axis

Definition at line 419 of file qwt_plot_grid.cpp.

bool QwtPlotGrid::yEnabled () const

Returns

true if horizontal grid lines are enabled

See also

enableY()

Definition at line 403 of file qwt_plot_grid.cpp.

bool QwtPlotGrid::yMinEnabled () const

Returns

true if minor horizontal grid lines are enabled

See also

enableYMin()

Definition at line 412 of file qwt_plot_grid.cpp.

const QwtScaleDiv & QwtPlotGrid::yScaleDiv () const

Returns

the scale division of the y axis

Definition at line 425 of file qwt_plot_grid.cpp.

Author

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Updated 2026-06-01 - jenkler.se | uex.se