Qwt User's Guide
|
Base class for needles that can be used in a QwtDial. More...
#include <qwt_dial_needle.h>
Public Member Functions | |
QwtDialNeedle () | |
Constructor. | |
virtual | ~QwtDialNeedle () |
Destructor. | |
virtual void | setPalette (const QPalette &) |
const QPalette & | palette () const |
virtual void | draw (QPainter *painter, const QPointF ¢er, double length, double direction, QPalette::ColorGroup=QPalette::Active) const |
Protected Member Functions | |
virtual void | drawNeedle (QPainter *painter, double length, QPalette::ColorGroup colorGroup) const =0 |
Draw the needle. | |
virtual void | drawKnob (QPainter *, double width, const QBrush &, bool sunken) const |
Draw the knob. |
Base class for needles that can be used in a QwtDial.
QwtDialNeedle is a pointer that indicates a value by pointing to a specific direction.
void QwtDialNeedle::draw | ( | QPainter * | painter, |
const QPointF & | center, | ||
double | length, | ||
double | direction, | ||
QPalette::ColorGroup | colorGroup = QPalette::Active |
||
) | const [virtual] |
Draw the needle
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 |
virtual void QwtDialNeedle::drawNeedle | ( | QPainter * | painter, |
double | length, | ||
QPalette::ColorGroup | colorGroup | ||
) | const [protected, pure virtual] |
Draw the needle.
The origin of the needle is at position (0.0, 0.0 ) pointing in direction 0.0 ( = east ).
The painter is already initialized with translation and rotation.
painter | Painter |
length | Length of the needle |
colorGroup | Color group, used for painting |
Implemented in QwtCompassWindArrow, QwtCompassMagnetNeedle, and QwtDialSimpleNeedle.
const QPalette & QwtDialNeedle::palette | ( | ) | const |
void QwtDialNeedle::setPalette | ( | const QPalette & | palette | ) | [virtual] |
Sets the palette for the needle.
palette | New Palette |