---
name: "QwtScaleDiv"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "6.1.4-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtScaleDiv"
---

# QwtScaleDiv(3)

A class representing a scale division.

## NAME

QwtScaleDiv - A class representing a scale division.

## SYNOPSIS

`#include <qwt_scale_div.h>`

### Public Types

enum **TickType** { **NoTick** = -1, **MinorTick**, **MediumTick**, **MajorTick**, **NTickTypes** }\
 Scale tick types.

### Public Member Functions

**QwtScaleDiv** (double **lowerBound**=0.0, double **upperBound**=0.0)\
 **QwtScaleDiv** (const **QwtInterval** &, QList\< double \>\[**NTickTypes**\])\
 **QwtScaleDiv** (double **lowerBound**, double **upperBound**, QList\< double \>\[**NTickTypes**\])\
 **QwtScaleDiv** (double **lowerBound**, double **upperBound**, const QList\< double \> &minorTicks, const QList\< double \> &mediumTicks, const QList\< double \> &majorTicks)\
 bool **operator==** (const **QwtScaleDiv** &) const\
 Equality operator.  bool **operator!=** (const **QwtScaleDiv** &) const\
 Inequality.  void **setInterval** (double **lowerBound**, double **upperBound**)\
 void **setInterval** (const **QwtInterval** &)\
 **QwtInterval** **interval** () const\
 void **setLowerBound** (double)\
 double **lowerBound** () const\
 void **setUpperBound** (double)\
 double **upperBound** () const\
 double **range** () const\
 bool **contains** (double value) const\
 void **setTicks** (int tickType, const QList\< double \> &)\
 QList\< double \> **ticks** (int tickType) const\
 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** ()\
 **QwtScaleDiv** **inverted** () const\
 **QwtScaleDiv** **bounded** (double **lowerBound**, double **upperBound**) const\

## Detailed Description

A class representing a scale division.

A Qwt scale is defined by its boundaries and 3 list for the positions of the major, medium and minor ticks.

The **upperBound()** might be smaller than the **lowerBound()** to indicate inverted scales.

Scale divisions can be calculated from a **QwtScaleEngine**.

**See also:**

**QwtScaleEngine::divideScale()**, **QwtPlot::setAxisScaleDiv()**, QwtAbstractSlider::setScaleDiv()

## Member Enumeration Documentation

### enum QwtScaleDiv::TickType

Scale tick types.

**Enumerator**

- *NoTick*

  *No ticks.*

- *MinorTick*

  *Minor ticks.*

- *MediumTick*

  *Medium ticks.*

- *MajorTick*

  *Major ticks.*

- *NTickTypes*

  *Number of valid tick types.*

## Constructor & Destructor Documentation

### QwtScaleDiv::QwtScaleDiv (double lowerBound = `0.0`, double upperBound = `0.0`)` [explicit]`

*Construct a division without ticks*

**Parameters:**

*lowerBound First boundary* \
 *upperBound Second boundary*

**Note:**

*lowerBound might be greater than upperBound for inverted scales*

### 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*

### 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*

### QwtScaleDiv::QwtScaleDiv (double lowerBound, double upperBound, const QList\< double \> & minorTicks, const QList\< double \> & mediumTicks, const QList\< double \> & majorTicks)` [explicit]`

*Construct a scale division*

**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*

## 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*

**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*

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

*Return if a value is between* **lowerBound()** *and* **upperBound()**

**Parameters:**

*value Value*

**Returns:**

*true/false*

### QwtInterval QwtScaleDiv::interval () const

**Returns:**

*lowerBound -\> upperBound*

### void QwtScaleDiv::invert ()

*Invert the scale division*

**See also:**

**inverted()**

### QwtScaleDiv QwtScaleDiv::inverted () const

**Returns:**

*A scale division with inverted boundaries and ticks*

**See also:**

**invert()**

### double QwtScaleDiv::lowerBound () const

**Returns:**

*First boundary*

**See also:**

**upperBound()**

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

*Inequality.*

**Returns:**

*true if this instance is not equal to other*

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

*Equality operator.*

**Returns:**

*true if this instance is equal to other*

### double QwtScaleDiv::range () const

**Returns:**

**upperBound()** *-* **lowerBound()**

### 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*

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

*Change the interval*

**Parameters:**

*interval Interval*

### void QwtScaleDiv::setLowerBound (double lowerBound)

*Set the first boundary*

**Parameters:**

*lowerBound First boundary*

**See also:**

*lowerBiound(),* **setUpperBound()**

### void QwtScaleDiv::setTicks (int type, const QList\< double \> & ticks)

*Assign ticks*

**Parameters:**

*type MinorTick, MediumTick or MajorTick* \
 *ticks Values of the tick positions*

### void QwtScaleDiv::setUpperBound (double upperBound)

*Set the second boundary*

**Parameters:**

*upperBound Second boundary*

**See also:**

**upperBound()***,* **setLowerBound()**

### QList\< double \> QwtScaleDiv::ticks (int type) const

*Return a list of ticks*

**Parameters:**

*type MinorTick, MediumTick or MajorTick*

**Returns:**

*Tick list*

### double QwtScaleDiv::upperBound () const

**Returns:**

*upper bound*

**See also:**

**lowerBound()**

## Author

*Generated automatically by Doxygen for Qwt User's Guide from the source code.*