QwtPlot(3)

📦 version 5.2.3a, in epel 9, fedora 43, fedora 44

🌈 NAME 🌈

QwtPlot — that's the whole name section bestie, the manpage literally just says the name and then nothing 💀 iconic minimalism fr

✨ okay context drop: this page lives in the Qwt User's Guide, section 3 (library calls, iykyk), and it's part 1 of 3 so buckle up, we are NOT done 🫶

🦋 SYNOPSIS 🦋

#include <qwt_plot.h>

Inherits QwtPlotDict. 💅

✨ Public Types ✨

  • enum Axis { yLeft, yRight, xBottom, xTop, axisCnt }
  • enum LegendPosition { LeftLegend, RightLegend, BottomLegend, TopLegend, ExternalLegend }

🎀 Public Slots 🎀

  • void autoRefresh ()
  • virtual void clear ()
  • virtual void replot ()

💌 Signals 💌

  • void legendChecked (QwtPlotItem *plotItem, bool on)
  • void legendClicked (QwtPlotItem *plotItem)

🌸 Public Member Functions 🌸

  • QwtPlot (QWidget *=NULL)
  • QwtPlot (const QwtText &title, QWidget *p=NULL)
  • virtual ~QwtPlot ()
  • void applyProperties (const QString &)
  • bool autoReplot () const
  • bool axisAutoScale (int axisId) const
  • bool axisEnabled (int axisId) const
  • QFont axisFont (int axisId) const
  • int axisMaxMajor (int axisId) const
  • int axisMaxMinor (int axisId) const
  • const QwtScaleDiv * axisScaleDiv (int axisId) const
  • QwtScaleDiv * axisScaleDiv (int axisId)
  • const QwtScaleDraw * axisScaleDraw (int axisId) const
  • QwtScaleDraw * axisScaleDraw (int axisId)
  • QwtScaleEngine * axisScaleEngine (int axisId)
  • const QwtScaleEngine * axisScaleEngine (int axisId) const
  • double axisStepSize (int axisId) const
  • QwtText axisTitle (int axisId) const
  • const QwtScaleWidget * axisWidget (int axisId) const
  • QwtScaleWidget * axisWidget (int axisId)
  • QwtPlotCanvas * canvas ()
  • const QwtPlotCanvas * canvas () const
  • const QColor & canvasBackground () const
  • int canvasLineWidth () const
  • virtual QwtScaleMap canvasMap (int axisId) const
  • virtual void drawCanvas (QPainter *)
  • void enableAxis (int axisId, bool tf=true)
  • virtual bool event (QEvent *)
  • QString grabProperties () const
  • void insertLegend (QwtLegend *, LegendPosition=QwtPlot::RightLegend, double ratio=-1.0)
  • double invTransform (int axisId, int pos) const
  • QwtLegend * legend ()
  • const QwtLegend * legend () const
  • int margin () const
  • virtual QSize minimumSizeHint () const
  • QwtPlotLayout * plotLayout ()
  • const QwtPlotLayout * plotLayout () const
  • virtual void polish ()
  • void print (QPaintDevice &p, const QwtPlotPrintFilter &=QwtPlotPrintFilter()) const
  • virtual void print (QPainter *, const QRect &rect, const QwtPlotPrintFilter &=QwtPlotPrintFilter()) const
  • void setAutoReplot (bool tf=true)
  • void setAxisAutoScale (int axisId)
  • void setAxisFont (int axisId, const QFont &f)
  • void setAxisLabelAlignment (int axisId, Qt::Alignment)
  • void setAxisLabelRotation (int axisId, double rotation)
  • void setAxisMaxMajor (int axisId, int maxMajor)
  • void setAxisMaxMinor (int axisId, int maxMinor)
  • void setAxisScale (int axisId, double min, double max, double step=0)
  • void setAxisScaleDiv (int axisId, const QwtScaleDiv &)
  • void setAxisScaleDraw (int axisId, QwtScaleDraw *)
  • void setAxisScaleEngine (int axisId, QwtScaleEngine *)
  • void setAxisTitle (int axisId, const QString &)
  • void setAxisTitle (int axisId, const QwtText &)
  • void setCanvasBackground (const QColor &c)
  • void setCanvasLineWidth (int w)
  • void setMargin (int margin)
  • void setTitle (const QString &)
  • void setTitle (const QwtText &t)
  • virtual QSize sizeHint () const
  • QwtText title () const
  • QwtTextLabel * titleLabel ()
  • const QwtTextLabel * titleLabel () const
  • int transform (int axisId, double value) const
  • void updateAxes ()
  • virtual void updateLayout ()

🔒 Protected Slots 🔒

  • virtual void legendItemChecked (bool)
  • virtual void legendItemClicked ()

🛠️ Protected Member Functions 🛠️

  • virtual void drawItems (QPainter *, const QRect &, const QwtScaleMap maps[axisCnt], const QwtPlotPrintFilter &) const
  • virtual void printCanvas (QPainter *, const QRect &boundingRect, const QRect &canvasRect, const QwtScaleMap maps[axisCnt], const QwtPlotPrintFilter &) const
  • virtual void printLegend (QPainter *, const QRect &) const
  • virtual void printLegendItem (QPainter *, const QWidget *, const QRect &) const
  • virtual void printScale (QPainter *, int axisId, int startDist, int endDist, int baseDist, const QRect &) const
  • virtual void printTitle (QPainter *, const QRect &) const
  • virtual void resizeEvent (QResizeEvent *e)
  • virtual void updateTabOrder ()

⭐ Static Protected Member Functions ⭐

  • static bool axisValid (int axisId)

💖 DETAILED DESCRIPTION 💖

A 2-D plotting widget. Yes ma'am, that's the whole vibe. 👑

QwtPlot is a widget for plotting two-dimensional graphs. You can stack an unlimited number of plot items on its canvas, no cap. Those plot items might be curves (QwtPlotCurve), markers (QwtPlotMarker), the grid (QwtPlotGrid), or literally anything else derived from QwtPlotItem. 🦋

A plot can have up to four axes, and each plot item gets attached to an x- and a y axis. The scales at the axes can be explicitly set (QwtScaleDiv), or they're calculated from the plot items using algorithms (QwtScaleEngine) that you can configure separately for each axis. Periodt.

🌟 Example 🌟

The following example shows (schematically) the most simple way to use QwtPlot. By default, only the left and bottom axes are visible and their scales are computed automatically.

#include <qwt_plot.h>
#include <qwt_plot_curve.h>

QwtPlot *myPlot = new QwtPlot("Two Curves", parent);

// add curves
QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
QwtPlotCurve *curve2 = new QwtPlotCurve("Curve 2");

// copy the data into the curves
curve1->setData(...);
curve2->setData(...);

curve1->attach(myPlot);
curve2->attach(myPlot);

// finally, refresh the plot
myPlot->replot();

🧚 MEMBER ENUMERATION DOCUMENTATION 🧚

enum QwtPlot::Axis

Axis index 💅 — that's the description, it's just "Axis index":

  • yLeft
  • yRight
  • xBottom
  • xTop

enum QwtPlot::LegendPosition

Position of the legend, relative to the canvas. 🌸

  • LeftLegend The legend will be left from the yLeft axis.
  • RightLegend The legend will be right from the yLeft axis.
  • BottomLegend The legend will be right below the xBottom axis.
  • TopLegend The legend will be between xTop axis and the title.
  • ExternalLegend External means that only the content of the legend will be handled by QwtPlot, but not its geometry. This might be interesting if an application wants to have a legend in an external window ( or on the canvas ).
🚨 Note: In case of ExternalLegend, the legend is not printed by print().
✨ See also: insertLegend()

🍼 CONSTRUCTOR & DESTRUCTOR DOCUMENTATION 🍼

QwtPlot::QwtPlot (QWidget *parent = NULL) [explicit]

Constructor. 🎀

Parameters:

  • parent — Parent widget

QwtPlot::QwtPlot (const QwtText &title, QWidget *parent = NULL) [explicit]

Constructor. 🎀

Parameters:

  • title — Title text
  • parent — Parent widget

📚 MEMBER FUNCTION DOCUMENTATION 📚

void QwtPlot::applyProperties (const QString &)

This method is intended for manipulating the plot widget from a specific editor in the Qwt designer plugin.

⚠️ Warning: The plot editor has never been implemented. 💀 so like... it's giving aspirational

bool QwtPlot::autoReplot () const

Returns:

  • true if the autoReplot option is set.

bool QwtPlot::axisAutoScale (intaxisId) const

Returns:

  • true if autoscaling is enabled

Parameters:

  • axisId — axis index

bool QwtPlot::axisEnabled (intaxisId) const

Returns:

  • true if a specified axis is enabled

Parameters:

  • axisId — axis index

QFont QwtPlot::axisFont (intaxisId) const

Returns:

  • the font of the scale labels for a specified axis

Parameters:

  • axisId — axis index

int QwtPlot::axisMaxMajor (intaxisId) const

Returns:

  • the maximum number of major ticks for a specified axis

Parameters:

  • axisId — axis index
  • sa setAxisMaxMajor()

int QwtPlot::axisMaxMinor (intaxisId) const

Returns:

  • the maximum number of minor ticks for a specified axis

Parameters:

  • axisId — axis index
  • sa setAxisMaxMinor()

const QwtScaleDiv * QwtPlot::axisScaleDiv (intaxisId) const

Return the scale division of a specified axis. axisScaleDiv(axisId)->lowerBound(), axisScaleDiv(axisId)->upperBound() are the current limits of the axis scale.

Parameters:

  • axisId — axis index

Returns:

  • Scale division
See also: QwtScaleDiv, setAxisScaleDiv()

QwtScaleDiv * QwtPlot::axisScaleDiv (intaxisId)

Return the scale division of a specified axis. axisScaleDiv(axisId)->lowerBound(), axisScaleDiv(axisId)->upperBound() are the current limits of the axis scale.

Parameters:

  • axisId — axis index

Returns:

  • Scale division
See also: QwtScaleDiv, setAxisScaleDiv()

const QwtScaleDraw * QwtPlot::axisScaleDraw (intaxisId) const

Returns:

  • the scale draw of a specified axis

Parameters:

  • axisId — axis index

Returns:

  • specified scaleDraw for axis, or NULL if axis is invalid.
See also: QwtScaleDraw

QwtScaleDraw * QwtPlot::axisScaleDraw (intaxisId)

Returns:

  • the scale draw of a specified axis

Parameters:

  • axisId — axis index

Returns:

  • specified scaleDraw for axis, or NULL if axis is invalid.
See also: QwtScaleDraw

QwtScaleEngine * QwtPlot::axisScaleEngine (intaxisId)

Parameters:

  • axisId — axis index

Returns:

  • Scale engine for a specific axis

const QwtScaleEngine * QwtPlot::axisScaleEngine (intaxisId) const

Parameters:

  • axisId — axis index

Returns:

  • Scale engine for a specific axis

double QwtPlot::axisStepSize (intaxisId) const

Return the step size parameter, that has been set in setAxisScale. This doesn't need to be the step size of the current scale.

Parameters:

  • axisId — axis index

Returns:

  • step size parameter value
See also: setAxisScale()

QwtText QwtPlot::axisTitle (intaxisId) const

Returns:

  • the title of a specified axis

Parameters:

  • axisId — axis index

bool QwtPlot::axisValid (intaxisId) [static], [protected]

Returns:

  • true if the specified axis exists, otherwise false

Parameters:

  • axisId — axis index

const QwtScaleWidget * QwtPlot::axisWidget (intaxisId) const

Returns:

  • specified axis, or NULL if axisId is invalid.

Parameters:

  • axisId — axis index

QwtScaleWidget * QwtPlot::axisWidget (intaxisId)

Returns:

  • specified axis, or NULL if axisId is invalid.

Parameters:

  • axisId — axis index

QwtPlotCanvas * QwtPlot::canvas ()

Returns:

  • the plot's canvas

const QwtPlotCanvas * QwtPlot::canvas () const

Returns:

  • the plot's canvas

const QColor & QwtPlot::canvasBackground () const

Nothing else than: canvas()->palette().color( QPalette::Normal, QColorGroup::Background); 💅

Returns:

  • the background color of the plotting area.

int QwtPlot::canvasLineWidth () const

okay so bestie, this one is literally nothing else than canvas()->lineWidth(), and it's only left for compatibility. It's giving "legacy but still cute". 💖

Returns: the border width of the plotting area. ✨

QwtScaleMap QwtPlot::canvasMap (intaxisId) const [virtual]

Parameters:

  • axisId — Axis (capital A, periodt) Returns: Map for the axis on the canvas. With this map pixel coordinates can translated to plot coordinates and vice versa. (Yes, "can translated" — we don't fix grammar here, we just vibe.) See also: QwtScaleMap, transform(), invTransform()

void QwtPlot::clear () [virtual], [slot]

Remove all curves and markers. 🧹

Deprecated: Use QwtPlotDeict::detachItems instead. (Yes, that's a typo in the original, we keep it. No cap.)

void QwtPlot::drawCanvas (QPainter *painter) [virtual]

Redraw the canvas.

Parameters:

  • painter — Painter used for drawing

Warning: drawCanvas calls drawItems what is also used for printing. Applications that like to add individual plot items better overload drawItems(). (So don't be extra, bestie.)

See also: drawItems()

void QwtPlot::drawItems (QPainter *painter, const QRect &rect, const QwtScaleMapmap[axisCnt], const QwtPlotPrintFilter &pfilter) const [protected], [virtual]

Redraw the canvas items.

Parameters:

  • painter — Painter used for drawing
  • rect — Bounding rectangle where to paint
  • map — QwtPlot::axisCnt maps, mapping between plot and paint device coordinates
  • pfilter — Plot print filter

void QwtPlot::enableAxis (intaxisId, booltf = true)

Enable or disable a specified axis. When an axis is disabled, this only means that it is not visible on the screen. Curves, markers and can be attached to disabled axes, and transformation of screen coordinates into values works as normal.

Only xBottom and yLeft are enabled by default. 👑

Parameters:

  • axisId — axis index
  • tf — true (enabled) or false (disabled)

QString QwtPlot::grabProperties () const

This method is intended for manipulating the plot widget from a specific editor in the Qwt designer plugin.

Warning: The plot editor has never been implemented. 💀 (It's giving vaporware, fr fr.)

void QwtPlot::insertLegend (QwtLegend *legend, QwtPlot::LegendPositionpos = QwtPlot::RightLegend, doubleratio = -1.0)

Insert a legend. If the position legend is QwtPlot::LeftLegend or QwtPlot::RightLegend the legend will be organized in one column from top to down. Otherwise the legend items will be placed in a table with a best fit number of columns from left to right.

If pos != QwtPlot::ExternalLegend the plot widget will become parent of the legend. It will be deleted when the plot is deleted, or another legend is set with insertLegend().

Parameters:

  • legend — Legend
  • pos — The legend's position. For top/left position the number of colums will be limited to 1, otherwise it will be set to unlimited.
  • ratio — Ratio between legend and the bounding rect of title, canvas and axes. The legend will be shrinked if it would need more space than the given ratio. The ratio is limited to ]0.0 .. 1.0]. In case of <= 0.0 it will be reset to the default ratio. The default vertical/horizontal ratio is 0.33/0.5.

See also: legend(), QwtPlotLayout::legendPosition(), QwtPlotLayout::setLegendPosition()

double QwtPlot::invTransform (intaxisId, intpos) const

Transform the x or y coordinate of a position in the drawing region into a value.

Parameters:

  • axisId — axis index
  • pos — position

Warning: The position can be an x or a y coordinate, depending on the specified axis. (So know your axis, bestie.)

QwtLegend * QwtPlot::legend ()

Returns: the plot's legend See also: insertLegend()

const QwtLegend * QwtPlot::legend () const

Returns: the plot's legend See also: insertLegend()

void QwtPlot::legendChecked (QwtPlotItem *plotItem, boolon) [signal]

A signal which is emitted when the user has clicked on a legend item, which is in QwtLegend::CheckableItem mode.

Parameters:

  • plotItem — Corresponding plot item of the selected legend item
  • on — True when the legen item is checked (yes, "legen" — we keep it)

Note: clicks are disabled as default

See also: QwtLegend::setItemMode(), QwtLegend::itemMode()

void QwtPlot::legendClicked (QwtPlotItem *plotItem) [signal]

A signal which is emitted when the user has clicked on a legend item, which is in QwtLegend::ClickableItem mode.

Parameters:

  • plotItem — Corresponding plot item of the selected legend item

Note: clicks are disabled as default

See also: QwtLegend::setItemMode(), QwtLegend::itemMode()

void QwtPlot::legendItemChecked (boolon) [protected], [virtual], [slot]

Called internally when the legend has been checked Emits a legendClicked() signal. (Original grammar, we keep it.)

void QwtPlot::legendItemClicked () [protected], [virtual], [slot]

Called internally when the legend has been clicked on. Emits a legendClicked() signal.

int QwtPlot::margin () const

Returns: margin See also: setMargin(), QwtPlotLayout::margin(), plotLayout()

QwtPlotLayout * QwtPlot::plotLayout ()

Returns: the plot's title (yes, it says title, not layout — we don't ask questions 🤷‍♀️)

const QwtPlotLayout * QwtPlot::plotLayout () const

Returns: the plot's titel label. (Keep that "titel" typo, iconic.)

void QwtPlot::print (QPaintDevice &paintDev, const QwtPlotPrintFilter &pfilter = QwtPlotPrintFilter()) const

Print the plot to a QPaintDevice (QPrinter) This function prints the contents of a QwtPlot instance to QPaintDevice object. The size is derived from its device metrics.

Parameters:

  • paintDev — device to paint on, often a printer
  • pfilter — print filter

See also: QwtPlotPrintFilter

void QwtPlot::print (QPainter *painter, const QRect &plotRect, const QwtPlotPrintFilter &pfilter = QwtPlotPrintFilter()) const [virtual]

Paint the plot into a given rectangle. Paint the contents of a QwtPlot instance into a given rectangle.

Parameters:

  • painter — Painter
  • plotRect — Bounding rectangle
  • pfilter — Print filter

See also: QwtPlotPrintFilter

void QwtPlot::printCanvas (QPainter *painter, const QRect &boundingRect, const QRect &canvasRect, const QwtScaleMapmap[axisCnt], const QwtPlotPrintFilter &pfilter) const [protected], [virtual]

Print the canvas into a given rectangle.

Parameters:

  • painter — Painter
  • map — Maps mapping between plot and paint device coordinates
  • boundingRect — Bounding rectangle
  • canvasRect — Canvas rectangle
  • pfilter — Print filter

See also: QwtPlotPrintFilter

void QwtPlot::printLegend (QPainter *painter, const QRect &rect) const [protected], [virtual]

Print the legend into a given rectangle.

Parameters:

  • painter — Painter
  • rect — Bounding rectangle

void QwtPlot::printLegendItem (QPainter *painter, const QWidget *w, const QRect &rect) const [protected], [virtual]

Print the legend item into a given rectangle.

Parameters:

  • painter — Painter
  • w — Widget representing a legend item
  • rect — Bounding rectangle

void QwtPlot::printScale (QPainter *painter, intaxisId, intstartDist, intendDist, intbaseDist, const QRect &rect) const [protected], [virtual]

Paint a scale into a given rectangle. Paint the scale into a given rectangle.

Parameters:

  • painter — Painter
  • axisId — Axis
  • startDist — Start border distance
  • endDist — End border distance
  • baseDist — Base distance
  • rect — Bounding rectangle

void QwtPlot::printTitle (QPainter *painter, const QRect &rect) const [protected], [virtual]

Print the title into a given rectangle.

Parameters:

  • painter — Painter
  • rect — Bounding rectangle

void QwtPlot::replot () [virtual], [slot]

Redraw the plot. If the autoReplot option is not set (which is the default) or if any curves are attached to raw data, the plot has to be refreshed explicitly in order to make changes visible.

See also: setAutoReplot()

Warning: Calls canvas()->repaint, take care of infinite recursions (so no infinite loops, bestie 💀)

void QwtPlot::resizeEvent (QResizeEvent *e) [protected], [virtual]

Resize and update internal layout

Parameters:

  • e — Resize event

void QwtPlot::setAutoReplot (booltf = true)

Set or reset the autoReplot option. If the autoReplot option is set, the plot will be updated implicitly by manipulating member functions. Since this may be time-consuming, it is recommended to leave this option switched off and call replot() explicitly if necessary.

The autoReplot option is set to false by default, which means that the user has to call replot() in order to make changes visible.

Parameters:

  • tf — true or false. Defaults to true.

See also: replot()

void QwtPlot::setAxisAutoScale (intaxisId)

Enable autoscaling for a specified axis. This member function is used to switch back to autoscaling mode after a fixed scale has been set. Autoscaling is enabled by default.

Parameters:

  • axisId — axis index

See also: setAxisScale(), setAxisScaleDiv()

void QwtPlot::setAxisFont (intaxisId, const QFont &f)

Change the font of an axis.

Parameters:

  • axisId — axis index
  • f — font

Warning: This function changes the font of the tick labels, not of the axis title. (So don't expect the title to change, bestie.)

void QwtPlot::setAxisLabelAlignment (intaxisId, Qt::Alignmentalignment)

Change the alignment of the tick labels

Parameters:

  • axisId — axis index
  • alignment — Or'd Qt::AlignmentFlags <see qnamespace.h>

See also: QwtScaleDraw::setLabelAlignment()

void QwtPlot::setAxisLabelRotation (intaxisId, doublerotation)

Rotate all tick labels

Parameters:

  • axisId — axis index
  • rotation — Angle in degrees. When changing the label rotation, the label alignment might be adjusted too.

See also: QwtScaleDraw::setLabelRotation(), setAxisLabelAlignment()

void QwtPlot::setAxisMaxMajor (intaxisId, intmaxMajor)

Set the maximum number of major scale intervals for a specified axis

Parameters:

  • axisId — axis index
  • maxMajor — maximum number of major steps

See also: axisMaxMajor()

void QwtPlot::setAxisMaxMinor (intaxisId, intmaxMinor)

Set the maximum number of minor scale intervals for a specified axis

Parameters:

  • axisId — axis index
  • maxMinor — maximum number of minor steps

See also: axisMaxMinor()

void QwtPlot::setAxisScale (intaxisId, doublemin, doublemax, doublestepSize = 0)

Disable autoscaling and specify a fixed scale for a selected axis.

Parameters:

  • axisId — axis index
  • min
  • max — minimum and maximum of the scale
  • stepSize — Major step size. If step == 0, the step size is calculated automatically using the maxMajor setting.

See also: setAxisMaxMajor(), setAxisAutoScale()

void QwtPlot::setAxisScaleDiv (int axisId, const QwtScaleDiv &scaleDiv)

Okay so bestie, this one turns autoscaling OFF and locks a fixed scale onto whichever axis you point at. You're literally hand-picking the scale division, no take-backs. 💅

  • axisId — the axis index
  • scaleDiv — the scale division

See also: setAxisScale(), setAxisAutoScale()

void QwtPlot::setAxisScaleDraw (int axisId, QwtScaleDraw *scaleDraw)

Set a scale draw, queen. 🌸

  • axisId — the axis index
  • scaleDraw — the object that's responsible for drawing the scales

By handing over scaleDraw you can extend QwtScaleDraw functionality and let it live inside QwtPlot. But listen — scaleDraw has to be created with new, and it will get deleted by the corresponding QwtScale member (like a child object, iykyk).

See also: QwtScaleDraw, QwtScaleWidget

⚠️ WARNING: the attributes of scaleDraw will be overwritten by those of the previous QwtScaleDraw. Not a drill. Don't come crying to me. 😭

void QwtPlot::setAxisScaleEngine (int axisId, QwtScaleEngine *scaleEngine)

Swap out the scale engine for an axis. New engine, new vibe, same plot. ✨

  • axisId — the axis index
  • scaleEngine — the scale engine

See also: axisScaleEngine()

void QwtPlot::setAxisTitle (int axisId, const QString &title)

Change the title of a specified axis. 🎀

  • axisId — the axis index
  • title — the axis title

void QwtPlot::setAxisTitle (int axisId, const QwtText &title)

Change the title of a specified axis — yes, again, but this time the QwtText flavored overload. Same energy, richer text. 💖

  • axisId — the axis index
  • title — the axis title

void QwtPlot::setCanvasBackground (const QColor &c)

Change the background of the plotting area. It sets c to QColorGroup::Background of all colorgroups of the palette of the canvas. And ngl, if you want the powerful version of this, using canvas()->setPalette() is a more powerful way to set these colors. 😌

  • c — the new background color

void QwtPlot::setCanvasLineWidth (int w)

Change the border width of the plotting area. Real talk: this does nothing else than canvas()->setLineWidth(w), and it's left here for compatibility only. It's giving legacy, bestie. 🫶

  • w — the new border width

void QwtPlot::setMargin (int margin)

Change the margin of the plot. The margin is the space around all components — the breathing room, the personal space, the aura. 🌈

  • margin — the new margin

See also: QwtPlotLayout::setMargin(), margin(), plotLayout()

void QwtPlot::setTitle (const QString &title)

Change the plot's title. Make it iconic. 👑

  • title — the new title

void QwtPlot::setTitle (const QwtText &title)

Change the plot's title, but the QwtText way this time. Same job, fancier fit. ✨

  • title — the new title

QSize QwtPlot::sizeHint () const [virtual]

Returns the sizeHint. It's the "how big does this want to be" answer. 📏

See also: minimumSizeHint()

QwtText QwtPlot::title () const

Returns: the plot's title 💖

QwtTextLabel * QwtPlot::titleLabel ()

Returns: the plot's title label.

const QwtTextLabel * QwtPlot::titleLabel () const

Returns: the plot's title label — the const version, for when you're just looking, not touching. 🙈

int QwtPlot::transform (int axisId, double value) const

Transform a value into a coordinate in the plotting region. Glow-up for your numbers. 🌟

  • axisId — the axis index
  • value — the value

Returns: the X or y coordinate in the plotting region that corresponds to the value.

void QwtPlot::updateLayout () [virtual]

Adjust plot content to its current size. Everything gets reshuffled so it fits the moment. 💅

See also: resizeEvent()

void QwtPlot::updateTabOrder () [protected], [virtual]

Update the focus tab order. ⌨️

The order gets changed so that the canvas will be in front of the first legend item, or behind the last legend item — depending on the position of the legend. Main character placement matters. 👑

🌸 AUTHOR 🌸

Generated automatically by Doxygen for Qwt User's Guide from the source code. Not a human, just a robot doing its lil thing, no cap. 🤖💜

And that's a wrap on the whole page, bestie!! 🎉 This was Version 5.2.3, dated Tue Nov 20 2012, straight out of the Qwt User's Guide — and yes, Doxygen auto-generated the whole thing from the source code. Go forth and plot something gorgeous. Slay. 💅✨🦋

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