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

# QwtCompassWindArrow(3)

An indicator for the wind direction.

## NAME

QwtCompassWindArrow - An indicator for the wind direction.

## SYNOPSIS

`#include <qwt_dial_needle.h>`

Inherits **QwtDialNeedle**.

### Public Types

enum **Style** { **Style1**, **Style2** }\
 Style of the arrow.

### Public Member Functions

**QwtCompassWindArrow** (**Style**, const QColor &light=Qt::white, const QColor &dark=Qt::gray)\

### Protected Member Functions

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

## Detailed Description

An indicator for the wind direction.

**QwtCompassWindArrow** shows the direction where the wind comes from.

- •

  QPalette::Light\
  \
    Used for Style1, or the light half of Style2

- •

  QPalette::Dark\
  \
    Used for the dark half of Style2

**See also:**

**QwtDial**, **QwtCompass**

## Member Enumeration Documentation

### enum QwtCompassWindArrow::Style

Style of the arrow.

**Enumerator**

- *Style1*

  *A needle pointing to the center.*

- *Style2*

  *A needle pointing to the center.*

## Constructor & Destructor Documentation

### QwtCompassWindArrow::QwtCompassWindArrow (Style style, const QColor & light = `Qt::white`, const QColor & dark = `Qt::gray`)

*Constructor*

**Parameters:**

*style Arrow style* \
 *light Light color* \
 *dark Dark color*

## Member Function Documentation

### void QwtCompassWindArrow::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***.*

## Author

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