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

# QwtDialSimpleNeedle(3)

A needle for dial widgets.

## NAME

QwtDialSimpleNeedle - A needle for dial widgets.

## SYNOPSIS

`#include <qwt_dial_needle.h>`

Inherits **QwtDialNeedle**.

### Public Types

enum **Style** { **Arrow**, **Ray** }\
 Style of the needle.

### Public Member Functions

**QwtDialSimpleNeedle** (**Style**, bool hasKnob=true, const QColor &mid=Qt::gray, const QColor &base=Qt::darkGray)\
 void **setWidth** (double **width**)\
 double **width** () const\

### Protected Member Functions

virtual void **drawNeedle** (QPainter \*, double length, QPalette::ColorGroup) const\

## Detailed Description

A needle for dial widgets.

The following colors are used:

- •

  QPalette::Mid\
  \
    Pointer

- •

  QPalette::Base\
  \
    Knob

**See also:**

**QwtDial**, **QwtCompass**

## Member Enumeration Documentation

### enum QwtDialSimpleNeedle::Style

Style of the needle.

**Enumerator**

- *Arrow*

  *Arrow.*

- *Ray*

  *A straight line from the center.*

## Constructor & Destructor Documentation

### QwtDialSimpleNeedle::QwtDialSimpleNeedle (Style style, bool hasKnob = `true`, const QColor & mid = `Qt::gray`, const QColor & base = `Qt::darkGray`)

*Constructor*

**Parameters:**

*style Style* \
 *hasKnob With/Without knob* \
 *mid Middle color* \
 *base Base color*

## Member Function Documentation

### void QwtDialSimpleNeedle::drawNeedle (QPainter \* painter, double length, QPalette::ColorGroup colorGroup) const` [protected]`, ` [virtual]`

*Draw the needle*

**Parameters:**

*painter Painter* \
 *length Length of the needle* \
 *colorGroup Color group, used for painting*

*Implements* **QwtDialNeedle***.*

### void QwtDialSimpleNeedle::setWidth (double width)

*Set the width of the needle*

**Parameters:**

*width Width*

**See also:**

**width()**

### double QwtDialSimpleNeedle::width () const

**Returns:**

*the width of the needle*

**See also:**

**setWidth()**

## Author

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