QwtAbstractScale(3)

💖 QwtAbstractScale 💖

okay bestie, welcome to QwtAbstractScale — the manual page for it lives in the Qwt User's Guide, and yes, the NAME line in the original is just the class name and a lonely little dash, so that's what we're working with: QwtAbstractScale — (that's it, that's the name, she's mysterious like that 🙈)

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✨ SYNOPSIS ✨

#include <qwt_abstract_scale.h>

Inherited by QwtKnob, QwtSlider, and QwtThermo.

🫶 Public Member Functions

• QwtAbstractScale ()
• virtual ~QwtAbstractScale ()
• bool autoScale () const
• const QwtScaleEngine * scaleEngine () const
• QwtScaleEngine * scaleEngine ()
• const QwtScaleMap & scaleMap () const
• int scaleMaxMajor () const
• int scaleMaxMinor () const
• void setAutoScale ()
• void setScale (double vmin, double vmax, double step=0.0)
• void setScale (const QwtDoubleInterval &, double step=0.0)
• void setScale (const QwtScaleDiv &s)
• void setScaleEngine (QwtScaleEngine *)
• void setScaleMaxMajor (int ticks)
• void setScaleMaxMinor (int ticks)

🧚 Protected Member Functions

• const QwtAbstractScaleDraw * abstractScaleDraw () const
• QwtAbstractScaleDraw * abstractScaleDraw ()
• void rescale (double vmin, double vmax, double step=0.0)
• virtual void scaleChange ()
• void setAbstractScaleDraw (QwtAbstractScaleDraw *)

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🌸 Detailed Description 🌸

She's an abstract base class for classes that contain a scale. Periodt.

QwtAbstractScale is literally here to hand classes a QwtScaleDraw and a QwtScaleDiv. And that QwtScaleDiv? It might be set explicitly, or it might get calculated by a QwtScaleEngine. Either way, she's got you 🫶

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🎀 Constructor & Destructor Documentation 🎀

QwtAbstractScale::QwtAbstractScale ()

Constructor.

Creates a default QwtScaleDraw and a QwtLinearScaleEngine. Autoscaling is enabled, and the stepSize is initialized by 0.0.

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👑 Member Function Documentation 👑

const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw () const

[protected]

Returns: Scale draw

See also: setAbstractScaleDraw()

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw () [protected]

Returns: Scale draw

See also: setAbstractScaleDraw()

bool QwtAbstractScale::autoScale () const

Returns: true if autoscaling is enabled

void QwtAbstractScale::rescale (doublevmin, doublevmax, doublestepSize = 0.0) [protected]

Recalculate the scale division and update the scale draw.

Parameters:

• vmin — Lower limit of the scale interval
• vmax — Upper limit of the scale interval
• stepSize — Major step size

See also: scaleChange()

void QwtAbstractScale::scaleChange () [protected], [virtual]

Notify changed scale. It's a dummy empty implementation, bestie — she's intended to be overloaded by derived classes. So like, the vibe is "you do it, not me" 💅

Reimplemented in QwtThermo, and QwtSlider.

const QwtScaleEngine * QwtAbstractScale::scaleEngine () const

Returns: Scale engine

See also: setScaleEngine()

QwtScaleEngine * QwtAbstractScale::scaleEngine ()

Returns: Scale engine

See also: setScaleEngine()

const QwtScaleMap & QwtAbstractScale::scaleMap () const

Returns: abstractScaleDraw()->scaleMap()

int QwtAbstractScale::scaleMaxMajor () const

Returns: Max. number of major tick intervals. The default value is 5.

int QwtAbstractScale::scaleMaxMinor () const

Returns: Max. number of minor tick intervals. The default value is 3.

void QwtAbstractScale::setAbstractScaleDraw (QwtAbstractScaleDraw *scaleDraw) [protected]

Set a scale draw.

⚠️ Heads up: scaleDraw has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setAbstractScaleDraw. So don't go deleting her yourself, she's got a whole lifecycle plan 💀

void QwtAbstractScale::setAutoScale ()

Advise the widget to control the scale range internally. Autoscaling is on by default.

See also: setScale(), autoScale()

void QwtAbstractScale::setScale (doublevmin, doublevmax, doublestepSize = 0.0)

Specify a scale. Disable autoscaling and define a scale by an interval and a step size.

Parameters:

• vmin — lower limit of the scale interval
• vmax — upper limit of the scale interval
• stepSize — major step size

See also: setAutoScale()

void QwtAbstractScale::setScale (const QwtDoubleInterval &interval, doublestepSize = 0.0)

Specify a scale. Disable autoscaling and define a scale by an interval and a step size.

Parameters:

• interval — Interval
• stepSize — major step size

See also: setAutoScale()

void QwtAbstractScale::setScale (const QwtScaleDiv &scaleDiv)

Specify a scale. Disable autoscaling and define a scale by a scale division.

Parameters:

• scaleDiv — Scale division

See also: setAutoScale()

void QwtAbstractScale::setScaleEngine (QwtScaleEngine *scaleEngine)

Set a scale engine. The scale engine is the one responsible for calculating the scale division, and in case of auto scaling, how to align the scale. She's the main character of scale math, fr fr 🔥

⚠️ Another one: scaleEngine has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setScaleEngine. Same deal as above, don't double-delete her 🙈

void QwtAbstractScale::setScaleMaxMajor (intticks)

Set the maximum number of major tick intervals. The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks. The default value is 5.

Parameters:

• ticks — maximal number of major ticks.

See also: QwtAbstractScaleDraw

void QwtAbstractScale::setScaleMaxMinor (intticks)

Set the maximum number of minor tick intervals. The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3.

Parameters:

• ticks

See also: QwtAbstractScaleDraw

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🌈 Author 🌈

Generated automatically by Doxygen for Qwt User's Guide from the source code. Not a human author, just a very diligent robot 🦋

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and that's the whole page, bestie!! 🎀✨

This lil doc is straight outta Qwt User's Guide, Version 5.2.3, dated Tue Nov 20 2012 — yeah she's an elder but she still ate 💅👑 mwah, go build something iconic with her 🫶💖