QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by QwtRoundScaleDraw::setAngleRange(). The geometry of the scale can be specified with QwtRoundScaleDraw::moveCenter() and QwtRoundScaleDraw::setRadius().
After a scale division has been specified as a QwtScaleDiv object using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), the scale can be drawn with the QwtAbstractScaleDraw::draw() member.
Definition at line 32 of file qwt_round_scale_draw.h.
Public Member Functions | |
QwtRoundScaleDraw () | |
QwtRoundScaleDraw (const QwtRoundScaleDraw &) | |
virtual | ~QwtRoundScaleDraw () |
QwtRoundScaleDraw & | operator= (const QwtRoundScaleDraw &other) |
void | setRadius (int radius) |
int | radius () const |
void | moveCenter (int x, int y) |
void | moveCenter (const QPoint &) |
QPoint | center () const |
void | setAngleRange (double angle1, double angle2) |
virtual int | extent (const QPen &, const QFont &) const |
Protected Member Functions | |
virtual void | drawTick (QPainter *p, double val, int len) const |
virtual void | drawBackbone (QPainter *p) const |
virtual void | drawLabel (QPainter *p, double val) const |
QwtRoundScaleDraw::QwtRoundScaleDraw | ( | ) |
Constructor.
The range of the scale is initialized to [0, 100], The center is set to (50, 50) with a radius of 50. The angle range is set to [-135, 135].
Definition at line 46 of file qwt_round_scale_draw.cpp.
References QwtAbstractScaleDraw::scaleMap(), QwtScaleMap::setPaintInterval(), and setRadius().
QwtRoundScaleDraw::QwtRoundScaleDraw | ( | const QwtRoundScaleDraw & | other | ) |
QwtRoundScaleDraw::~QwtRoundScaleDraw | ( | ) | [virtual] |
QwtRoundScaleDraw & QwtRoundScaleDraw::operator= | ( | const QwtRoundScaleDraw & | other | ) |
void QwtRoundScaleDraw::setRadius | ( | int | radius | ) |
Change of radius the scale
Radius is the radius of the backbone without ticks and labels.
radius | New Radius |
Definition at line 84 of file qwt_round_scale_draw.cpp.
Referenced by QwtRoundScaleDraw().
int QwtRoundScaleDraw::radius | ( | ) | const |
Get the radius
Radius is the radius of the backbone without ticks and labels.
Definition at line 96 of file qwt_round_scale_draw.cpp.
Referenced by drawBackbone(), drawLabel(), and drawTick().
void QwtRoundScaleDraw::moveCenter | ( | const QPoint & | center | ) |
Move the center of the scale draw, leaving the radius unchanged
center | New center |
Definition at line 107 of file qwt_round_scale_draw.cpp.
QPoint QwtRoundScaleDraw::center | ( | ) | const |
void QwtRoundScaleDraw::setAngleRange | ( | double | angle1, | |
double | angle2 | |||
) |
Adjust the baseline circle segment for round scales.
The baseline will be drawn from min(angle1,angle2) to max(angle1, angle2). The default setting is [ -135, 135 ]. An angle of 0 degrees corresponds to the 12 o'clock position, and positive angles count in a clockwise direction.
angle1 | ||
angle2 | boundaries of the angle interval in degrees. |
Definition at line 135 of file qwt_round_scale_draw.cpp.
References QwtAbstractScaleDraw::scaleMap(), and QwtScaleMap::setPaintInterval().
Referenced by QwtKnob::setTotalAngle().
int QwtRoundScaleDraw::extent | ( | const QPen & | pen, | |
const QFont & | font | |||
) | const [virtual] |
Calculate the extent of the scale
The extent is the distcance between the baseline to the outermost pixel of the scale draw. radius() + extent() is an upper limit for the radius of the bounding circle.
pen | Pen that is used for painting backbone and ticks | |
font | Font used for painting the labels |
Implements QwtAbstractScaleDraw.
Definition at line 267 of file qwt_round_scale_draw.cpp.
References QwtScaleDiv::contains(), QwtAbstractScaleDraw::hasComponent(), QwtText::isEmpty(), QwtAbstractScaleDraw::label(), QwtAbstractScaleDraw::majTickLength(), QwtAbstractScaleDraw::map(), QwtAbstractScaleDraw::minimumExtent(), QwtAbstractScaleDraw::scaleDiv(), QwtAbstractScaleDraw::spacing(), QwtText::textSize(), QwtAbstractScaleDraw::tickLabel(), QwtScaleDiv::ticks(), and QwtScaleMap::transform().
Referenced by QwtKnob::minimumSizeHint().
void QwtRoundScaleDraw::drawTick | ( | QPainter * | painter, | |
double | value, | |||
int | len | |||
) | const [protected, virtual] |
Draw a tick
painter | Painter | |
value | Value of the tick | |
len | Lenght of the tick |
Implements QwtAbstractScaleDraw.
Definition at line 205 of file qwt_round_scale_draw.cpp.
References QwtPainter::drawLine(), QwtAbstractScaleDraw::map(), radius(), and QwtScaleMap::transform().
void QwtRoundScaleDraw::drawBackbone | ( | QPainter * | painter | ) | const [protected, virtual] |
Draws the baseline of the scale
painter | Painter |
Implements QwtAbstractScaleDraw.
Definition at line 239 of file qwt_round_scale_draw.cpp.
References QwtAbstractScaleDraw::map(), and radius().
void QwtRoundScaleDraw::drawLabel | ( | QPainter * | painter, | |
double | value | |||
) | const [protected, virtual] |
Draws the label for a major scale tick
painter | Painter | |
value | Value |
Implements QwtAbstractScaleDraw.
Definition at line 160 of file qwt_round_scale_draw.cpp.
References QwtText::draw(), QwtAbstractScaleDraw::hasComponent(), QwtText::isEmpty(), QwtAbstractScaleDraw::label(), QwtAbstractScaleDraw::majTickLength(), QwtAbstractScaleDraw::map(), radius(), QwtAbstractScaleDraw::spacing(), QwtText::textSize(), QwtAbstractScaleDraw::tickLabel(), and QwtScaleMap::transform().