QwtPlotGrid(3)

📦

version 6.3.0 · 6 versions

🌈 `QwtPlotGrid` — Library Functions Manual 🌈

Okay bestie, this is the QwtPlotGrid page from the Library Functions Manual, and it’s giving coordinate-grid main character energy: major lines, minor lines, pens, scale divisions, all of it. 💅

✨ 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 🌟

Okay so QwtPlotGrid is 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 💅

okay bestie, this is the part where QwtPlotGrid actually does the thing — drawing lines, flipping pens, checking whether stuff is enabled. grid glow-up era ✨

🎨 `QwtPlotGrid::draw`

void QwtPlotGrid::draw (QPainter * painter, const QwtScaleMap & xMap, const
    QwtScaleMap & 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. literally mapping the math onto the screen, no cap 💖

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.

🦋 `QwtPlotGrid::enableX`

void QwtPlotGrid::enableX (bool on)

Enable or disable vertical grid lines. vertical lines have entered the chat 🦋

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.

🧚 `QwtPlotGrid::enableXMin`

void QwtPlotGrid::enableXMin (bool on)

Enable or disable minor vertical grid lines. the tiny verticals, the little icons 🧚

on — Enable (true) or disable

See also: enableX()

Definition at line 108 of file qwt_plot_grid.cpp.

🌈 `QwtPlotGrid::enableY`

void QwtPlotGrid::enableY (bool on)

Enable or disable horizontal grid lines. horizontal besties rise up 🌈

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.

🍓 `QwtPlotGrid::enableYMin`

void QwtPlotGrid::enableYMin (bool on)

Enable or disable minor horizontal grid lines. small horizontal lines, big main-character energy 🍓

on — Enable (true) or disable

See also: enableY()

Definition at line 124 of file qwt_plot_grid.cpp.

💅 `QwtPlotGrid::majorPen`

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.

🎀 `QwtPlotGrid::minorPen`

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.

👑 `QwtPlotGrid::rtti`

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

Returns: QwtPlotItem::Rtti_PlotGrid

Reimplemented from QwtPlotItem.

Definition at line 64 of file qwt_plot_grid.cpp.

🔥 `QwtPlotGrid::setMajorPen` — colour edition

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. major-line pen glow-up, periodt 🔥

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.

color — Pen color
width — Pen width
style — Pen style

See also: pen(), brush()

Definition at line 212 of file qwt_plot_grid.cpp.

💜 `QwtPlotGrid::setMajorPen` — pen edition

void QwtPlotGrid::setMajorPen (const QPen & pen)

Assign a pen for the major grid lines. you already have a pen? slay, pass it here 💜

pen — Pen

See also: majorPen(), setMinorPen(), setPen()

Definition at line 223 of file qwt_plot_grid.cpp.

🌸 `QwtPlotGrid::setMinorPen` — colour edition

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. tiny lines deserve cute pens too 🌸

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.

color — Pen color
width — Pen width
style — Pen style

See also: pen(), brush()

Definition at line 247 of file qwt_plot_grid.cpp.

🧚 `QwtPlotGrid::setMinorPen` — pen edition

void QwtPlotGrid::setMinorPen (const QPen & pen)

Assign a pen for the minor grid lines. minor pen, major vibe 🧚

pen — Pen

See also: minorPen(), setMajorPen(), setPen()

Definition at line 258 of file qwt_plot_grid.cpp.

⭐ `QwtPlotGrid::setPen` — colour edition

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. one pen to rule them all, fr fr ⭐

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.

color — Pen color
width — Pen width
style — Pen style

See also: pen(), brush()

Definition at line 176 of file qwt_plot_grid.cpp.

🫶 `QwtPlotGrid::setPen` — pen edition

void QwtPlotGrid::setPen (const QPen & pen)

Assign a pen for both major and minor grid lines. same pen energy for the whole grid, love that for us 🫶

pen — Pen

See also: setMajorPen(), setMinorPen()

Definition at line 187 of file qwt_plot_grid.cpp.

🦋 `QwtPlotGrid::setXDiv`

void QwtPlotGrid::setXDiv (const QwtScaleDiv & scaleDiv)

Assign an x axis scale division. x-axis divisions are officially assigned 🦋

scaleDiv — Scale division

Definition at line 140 of file qwt_plot_grid.cpp.

🌈 `QwtPlotGrid::setYDiv`

void QwtPlotGrid::setYDiv (const QwtScaleDiv & scaleDiv)

Assign a y axis division. y-axis divisions, you're up 🌈

scaleDiv — Scale division

Definition at line 154 of file qwt_plot_grid.cpp.

🔥 `QwtPlotGrid::updateScaleDiv`

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

Update the grid to changes of the axes scale division. the axes changed, so the grid said “noted” and updated 🔥

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.

💖 `QwtPlotGrid::xEnabled`

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.

🎀 `QwtPlotGrid::xMinEnabled`

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.

💜 `QwtPlotGrid::xScaleDiv`

const QwtScaleDiv & QwtPlotGrid::xScaleDiv () const

Returns: the scale division of the x axis

Definition at line 419 of file qwt_plot_grid.cpp.

🌸 `QwtPlotGrid::yEnabled`

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.

🍓 `QwtPlotGrid::yMinEnabled`

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.

🧚 `QwtPlotGrid::yScaleDiv`

const QwtScaleDiv & QwtPlotGrid::yScaleDiv () const

Returns: the scale division of the y axis

Definition at line 425 of file qwt_plot_grid.cpp.

🫶 Author 🫶

Generated automatically by Doxygen for Qwt User's Guide from the source code. the robot made the skeleton, we just gave it the group-chat glow-up 🤖💖

okay that's the whole page, bestie 💅 — footer vibe check: source/version is Qwt User's Guide / QwtPlotGrid(3), and the date is whatever timestamp your local footer stamps in. Mwah 💋✨

📦 where this page comes from

alpine 3.24: qwt-doc 6.3.0-r0 · custom
💖 girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on 2026-11-04: a language model's rewrite of the original, under its terms

QwtPlotGrid(3)

🌈 QwtPlotGrid — Library Functions Manual 🌈

✨ NAME ✨

🌸 SYNOPSIS 🌸

💖 Public Member Functions

🫶 Public Member Functions inherited from QwtPlotItem

🎀 Additional Inherited Members

Public Types inherited from QwtPlotItem

Protected Member Functions inherited from QwtPlotItem

🌟 Detailed Description 🌟

💖 Constructor & Destructor Documentation 💖

QwtPlotGrid::QwtPlotGrid () [explicit]

QwtPlotGrid::~QwtPlotGrid () [virtual]

💅 Member Function Documentation 💅

🎨 QwtPlotGrid::draw

🦋 QwtPlotGrid::enableX

🧚 QwtPlotGrid::enableXMin

🌈 QwtPlotGrid::enableY

🍓 QwtPlotGrid::enableYMin

💅 QwtPlotGrid::majorPen

🎀 QwtPlotGrid::minorPen

👑 QwtPlotGrid::rtti

🔥 QwtPlotGrid::setMajorPen — colour edition

💜 QwtPlotGrid::setMajorPen — pen edition

🌸 QwtPlotGrid::setMinorPen — colour edition

🧚 QwtPlotGrid::setMinorPen — pen edition

⭐ QwtPlotGrid::setPen — colour edition

🫶 QwtPlotGrid::setPen — pen edition

🦋 QwtPlotGrid::setXDiv

🌈 QwtPlotGrid::setYDiv

🔥 QwtPlotGrid::updateScaleDiv

💖 QwtPlotGrid::xEnabled

🎀 QwtPlotGrid::xMinEnabled

💜 QwtPlotGrid::xScaleDiv

🌸 QwtPlotGrid::yEnabled

🍓 QwtPlotGrid::yMinEnabled

🧚 QwtPlotGrid::yScaleDiv

🫶 Author 🫶

🌈 `QwtPlotGrid` — Library Functions Manual 🌈

🫶 Public Member Functions inherited from `QwtPlotItem`

Public Types inherited from `QwtPlotItem`

Protected Member Functions inherited from `QwtPlotItem`

`QwtPlotGrid::QwtPlotGrid ()` [explicit]

`QwtPlotGrid::~QwtPlotGrid ()` [virtual]

🎨 `QwtPlotGrid::draw`

🦋 `QwtPlotGrid::enableX`

🧚 `QwtPlotGrid::enableXMin`

🌈 `QwtPlotGrid::enableY`

🍓 `QwtPlotGrid::enableYMin`

💅 `QwtPlotGrid::majorPen`

🎀 `QwtPlotGrid::minorPen`

👑 `QwtPlotGrid::rtti`

🔥 `QwtPlotGrid::setMajorPen` — colour edition

💜 `QwtPlotGrid::setMajorPen` — pen edition

🌸 `QwtPlotGrid::setMinorPen` — colour edition

🧚 `QwtPlotGrid::setMinorPen` — pen edition

⭐ `QwtPlotGrid::setPen` — colour edition

🫶 `QwtPlotGrid::setPen` — pen edition

🦋 `QwtPlotGrid::setXDiv`

🌈 `QwtPlotGrid::setYDiv`

🔥 `QwtPlotGrid::updateScaleDiv`

💖 `QwtPlotGrid::xEnabled`

🎀 `QwtPlotGrid::xMinEnabled`

💜 `QwtPlotGrid::xScaleDiv`

🌸 `QwtPlotGrid::yEnabled`

🍓 `QwtPlotGrid::yMinEnabled`

🧚 `QwtPlotGrid::yScaleDiv`