# QwtCompassWindArrow Class Reference

An indicator for the wind direction. More...

`#include <qwt_dial_needle.h>`

Inheritance diagram for QwtCompassWindArrow:
[legend]

List of all members.

## Public Types

enum | Style { Style1, Style2 }

## Public Member Functions

| QwtCompassWindArrow (Style, const QColor &light=Qt::white, const QColor &dark=Qt::gray)
virtual void | draw (QPainter *, const QPoint &, int length, double direction, QPalette::ColorGroup=QPalette::Active) const

## Static Public Member Functions

static void | drawStyle1Needle (QPainter *, const QPalette &, QPalette::ColorGroup, const QPoint &, int length, double direction)
static void | drawStyle2Needle (QPainter *, const QPalette &, QPalette::ColorGroup, const QPoint &, int length, double direction)

## Detailed Description

An indicator for the wind direction.

QwtCompassWindArrow shows the direction where the wind comes from.

- QColorGroup::Light
  Used for Style1, or the light half of Style2
- QColorGroup::Dark
  Used for the dark half of Style2

See also:
  QwtDial, QwtCompass

## Member Enumeration Documentation

enum QwtCompassWindArrow::Style

Style of the arrow.

## 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::draw | ( | QPainter * | painter,
|  | const QPoint & | center,
|  | int | length,
|  | double | direction,
|  | QPalette::ColorGroup | colorGroup = `QPalette::Active` |
| ) |  |  | const`[virtual]`

Draw the needle

Parameters:

  | painter | Painter
  | center | Center of the dial, start position for the needle
  | length | Length of the needle
  | direction | Direction of the needle, in degrees counter clockwise
  | colorGroup | Color group, used for painting

Implements QwtDialNeedle.

void QwtCompassWindArrow::drawStyle1Needle | ( | QPainter * | painter,
|  | const QPalette & | palette,
|  | QPalette::ColorGroup | colorGroup,
|  | const QPoint & | center,
|  | int | length,
|  | double | direction |
| ) |  |  | `[static]`

Draw a compass needle

Parameters:

  | painter | Painter
  | palette | Palette
  | colorGroup | colorGroup
  | center | Center of the dial, start position for the needle
  | length | Length of the needle
  | direction | Direction of the needle, in degrees counter clockwise

void QwtCompassWindArrow::drawStyle2Needle | ( | QPainter * | painter,
|  | const QPalette & | palette,
|  | QPalette::ColorGroup | colorGroup,
|  | const QPoint & | center,
|  | int | length,
|  | double | direction |
| ) |  |  | `[static]`

Draw a compass needle

Parameters:

  | painter | Painter
  | palette | Palette
  | colorGroup | colorGroup
  | center | Center of the dial, start position for the needle
  | length | Length of the needle
  | direction | Direction of the needle, in degrees counter clockwise