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

# QwtNullTransform(3)

Null transformation.

## NAME

QwtNullTransform - Null transformation.

## SYNOPSIS

`#include <qwt_transform.h>`

Inherits **QwtTransform**.

### Public Member Functions

**QwtNullTransform** ()\
 Constructor.  virtual **~QwtNullTransform** ()\
 Destructor.  virtual double **transform** (double value) const\
 virtual double **invTransform** (double value) const\
 virtual **QwtTransform** \* **copy** () const\

## Detailed Description

Null transformation.

**QwtNullTransform** returns the values unmodified.

## Member Function Documentation

### QwtTransform \* QwtNullTransform::copy () const` [virtual]`

**Returns:**

Clone of the transformation

Implements **QwtTransform**.

### double QwtNullTransform::invTransform (double value) const` [virtual]`

**Parameters:**

*value* Value to be transformed

**Returns:**

value unmodified

Implements **QwtTransform**.

### double QwtNullTransform::transform (double value) const` [virtual]`

**Parameters:**

*value* Value to be transformed

**Returns:**

value unmodified

Implements **QwtTransform**.

## Author

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