QwtScaleDiv(3)

📦

version 6.3.0 · 6 versions

💅 QwtScaleDiv 💅

okay so real talk — this page comes to you straight out of the Library Functions Manual, and it's all about QwtScaleDiv, a class representing a scale division. she's iconic, she's geometric, she's got main character energy. let's get into it 🎀

✨ NAME ✨

QwtScaleDiv — a class representing a scale division. no cap, that's literally the whole thing 💖

🦋 SYNOPSIS 🦋

#include <qwt_scale_div.h>

🌸 Public Types 🌸

enum TickType { NoTick = -1, MinorTick, MediumTick, MajorTick,
    NTickTypes }

Scale tick types ✨ (yes bestie, there are four of them, we'll get there)

🫶 Public Member Functions 🫶

QwtScaleDiv (double lowerBound=0.0, double upperBound=0.0) — the basic constructor
QwtScaleDiv (const QwtInterval &, QList< double >[NTickTypes]) — constructor from an interval plus a tick array
QwtScaleDiv (double lowerBound, double upperBound, QList< double >[NTickTypes]) — constructor from two bounds plus a tick array
QwtScaleDiv (double lowerBound, double upperBound, const QList< double > &minorTicks, const QList< double > &mediumTicks, const QList< double > &majorTicks) — the "gimme all three tick lists explicitly" constructor
bool operator== (const QwtScaleDiv &) const — Equality operator. 💯
bool operator!= (const QwtScaleDiv &) const — Inequality. the opposite vibe 🙈
void setInterval (double lowerBound, double upperBound) — set the interval from two numbers
void setInterval (const QwtInterval &) — set the interval from a QwtInterval
QwtInterval interval () const — grab the interval back out
void setLowerBound (double) — set the lower bound
double lowerBound () const — read the lower bound
void setUpperBound (double) — set the upper bound
double upperBound () const — read the upper bound
double range () const — the range
bool contains (double value) const — is this value in here or not
void setTicks (int tickType, const QList< double > &) — assign ticks
QList< double > ticks (int tickType) const — get the tick list for a type
bool isEmpty () const — Check if the scale division is empty( lowerBound() == upperBound() ). ⭐
bool isIncreasing () const — Check if the scale division is increasing( lowerBound() <= upperBound() ). ⭐
void invert () — flip it in place
QwtScaleDiv inverted () const — get a flipped copy
QwtScaleDiv bounded (double lowerBound, double upperBound) const — clamp a copy to an interval

🌈 Detailed Description 🌈

A class representing a scale division. periodt.

A Qwt scale is defined by its boundaries and 3 list for the positions of the major, medium and minor ticks. (three lists, three tick flavors — she's organized 💅)

the tea on upperBound(): it might be smaller than the lowerBound() to indicate inverted scales. yes bestie, that's on purpose, that's not a bug, don't come for her 😭

Scale divisions can be calculated from a QwtScaleEngine. 🧚

See also: QwtScaleEngine::divideScale(), QwtPlot::setAxisScaleDiv(), QwtAbstractSlider::setScaleDiv()

Definition at line 33 of file qwt_scale_div.h.

🎀 Member Enumeration Documentation 🎀

`enum QwtScaleDiv::TickType`

Scale tick types. the whole tick taxonomy, laid out 🦋

Enumerator:

NoTick — No ticks. literally none. the void. 💀
MinorTick — Minor ticks. the little ones 🍓
MediumTick — Medium ticks. the middle children 🌸
MajorTick — Major ticks. the main characters 👑
NTickTypes — Number of valid tick types.

Definition at line 37 of file qwt_scale_div.h.

✨ Constructor & Destructor Documentation ✨

`QwtScaleDiv::QwtScaleDiv (double lowerBound = 0.0, double upperBound = 0.0)`

[explicit]

Construct a division without ticks. a clean slate, no little marks anywhere, just vibes 🫶

Parameters:

lowerBound — First boundary
upperBound — Second boundary

Note: lowerBound might be greater than upperBound for inverted scales. (inverted is a look, okay?)

Definition at line 21 of file qwt_scale_div.cpp.

`QwtScaleDiv::QwtScaleDiv (const QwtInterval & interval, QList< double > ticks[NTickTypes])`

[explicit]

Construct a scale division 💖

Parameters:

interval — Interval
ticks — List of major, medium and minor ticks

Definition at line 33 of file qwt_scale_div.cpp.

`QwtScaleDiv::QwtScaleDiv (double lowerBound, double upperBound, QList< double > ticks[NTickTypes])`

[explicit]

Construct a scale division 💖

Parameters:

lowerBound — First boundary
upperBound — Second boundary
ticks — List of major, medium and minor ticks

Note: lowerBound might be greater than upperBound for inverted scales.

Definition at line 51 of file qwt_scale_div.cpp.

`QwtScaleDiv::QwtScaleDiv (double lowerBound, double upperBound, const QList< double > & minorTicks, const QList< double > & mediumTicks, const QList< double > & majorTicks)`

[explicit]

Construct a scale division 💖 (this one wants all three lists handed to her directly, no array, we love an explicit queen)

Parameters:

lowerBound — First boundary
upperBound — Second boundary
minorTicks — List of minor ticks
mediumTicks — List medium ticks
majorTicks — List of major ticks

Note: lowerBound might be greater than upperBound for inverted scales.

Definition at line 71 of file qwt_scale_div.cpp.

💜 Member Function Documentation 💜

`QwtScaleDiv QwtScaleDiv::bounded (double lowerBound, double upperBound) const`

Return a scale division with an interval [lowerBound, upperBound] where all ticks outside this interval are removed. she's doing a little cleanup, a little curation, a little "you're not on the guest list" energy ✨

Parameters:

lowerBound — Lower bound
upperBound — Upper bound

Returns: Scale division with all ticks inside of the given interval

Note: lowerBound might be greater than upperBound for inverted scales.

Definition at line 263 of file qwt_scale_div.cpp.

`bool QwtScaleDiv::contains (double value) const`

Return if a value is between lowerBound() and upperBound(). the vibe check for numbers 🫶

Parameters:

value — Value

Returns: true/false

Definition at line 212 of file qwt_scale_div.cpp.

`QwtInterval QwtScaleDiv::interval () const`

Returns: lowerBound -> upperBound

Definition at line 111 of file qwt_scale_div.cpp.

`void QwtScaleDiv::invert ()`

Invert the scale division. do it in place, no copy, no drama 💅

See also: inverted()

Definition at line 224 of file qwt_scale_div.cpp.

`QwtScaleDiv QwtScaleDiv::inverted () const`

Returns: A scale division with inverted boundaries and ticks

See also: invert()

Definition at line 244 of file qwt_scale_div.cpp.

`bool QwtScaleDiv::isEmpty () const`

Check if the scale division is empty( lowerBound() == upperBound() ). 😭

Definition at line 195 of file qwt_scale_div.cpp.

`bool QwtScaleDiv::isIncreasing () const`

Check if the scale division is increasing( lowerBound() <= upperBound() ). ⭐

Definition at line 201 of file qwt_scale_div.cpp.

`double QwtScaleDiv::lowerBound () const`

Returns: First boundary

See also: upperBound()

Definition at line 131 of file qwt_scale_div.cpp.

`bool QwtScaleDiv::operator!= (const QwtScaleDiv & other) const`

Inequality. 🙈

Returns: true if this instance is not equal to other

Definition at line 189 of file qwt_scale_div.cpp.

`bool QwtScaleDiv::operator== (const QwtScaleDiv & other) const`

Equality operator. 💯

Returns: true if this instance is equal to other

Definition at line 168 of file qwt_scale_div.cpp.

`double QwtScaleDiv::range () const`

Returns: upperBound() - lowerBound()

Definition at line 159 of file qwt_scale_div.cpp.

`void QwtScaleDiv::setInterval (const QwtInterval & interval)`

Change the interval.

Parameters:

interval — Interval

Definition at line 102 of file qwt_scale_div.cpp.

`void QwtScaleDiv::setInterval (double lowerBound, double upperBound)`

Change the interval.

Parameters:

lowerBound — First boundary
upperBound — Second boundary

Note: lowerBound might be greater than upperBound for inverted scales.

Definition at line 91 of file qwt_scale_div.cpp.

`void QwtScaleDiv::setLowerBound (double lowerBound)`

Set the first boundary.

Parameters:

lowerBound — First boundary

See also: lowerBound(), setUpperBound()

Definition at line 122 of file qwt_scale_div.cpp.

`void QwtScaleDiv::setTicks (int tickType, const QList< double > & ticks)`

Assign ticks. 🎀

Parameters:

tickType — MinorTick, MediumTick or MajorTick
ticks — Values of the tick positions

Definition at line 297 of file qwt_scale_div.cpp.

`void QwtScaleDiv::setUpperBound (double upperBound)`

Set the second boundary.

Parameters:

upperBound — Second boundary

See also: upperBound(), setLowerBound()

Definition at line 142 of file qwt_scale_div.cpp.

`QList< double > QwtScaleDiv::ticks (int tickType) const`

Return a list of ticks. 🌸

Parameters:

tickType — MinorTick, MediumTick or MajorTick

Returns: Tick list

Definition at line 309 of file qwt_scale_div.cpp.

`double QwtScaleDiv::upperBound () const`

Returns: upper bound

See also: lowerBound()

Definition at line 151 of file qwt_scale_div.cpp.

👑 Author 👑

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and that's the whole page bestie 🫶 this div came to you from the Qwt User's Guide, auto-generated by Doxygen straight from the source code — so if you're picturing a tired little robot typing this out at 3am, you're honestly not far off 😭💖 slay, go build something pretty with it. 🎀✨

📦 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