QwtRoundScaleDraw Class Reference

Inheritance diagram for QwtRoundScaleDraw:

[legend]Collaboration diagram for QwtRoundScaleDraw:

[legend]List of all members.

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Detailed Description

A class for drawing round scales.

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

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Constructor & Destructor Documentation

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 &   )

Copy constructor. Definition at line 55 of file qwt_round_scale_draw.cpp. References d_data.

QwtRoundScaleDraw::~QwtRoundScaleDraw (   )  [virtual]

Destructor. Definition at line 63 of file qwt_round_scale_draw.cpp.

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Member Function Documentation

QPoint QwtRoundScaleDraw::center (   )  const

Get the center of the scale. Definition at line 113 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::drawBackbone (  QPainter *  painter  )  const [protected, virtual]

Draws the baseline of the scale Parameters: painter  Painter See also: drawTick(), drawLabel() Implements QwtAbstractScaleDraw. Definition at line 241 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 Parameters: painter  Painter value  Value See also: drawTick(), drawBackbone() Implements QwtAbstractScaleDraw. Definition at line 162 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().

void QwtRoundScaleDraw::drawTick (  QPainter *  painter, double  value, int  len )  const [protected, virtual]

Draw a tick Parameters: painter  Painter value  Value of the tick len  Lenght of the tick See also: drawBackbone(), drawLabel() Implements QwtAbstractScaleDraw. Definition at line 207 of file qwt_round_scale_draw.cpp. References QwtPainter::drawLine(), QwtAbstractScaleDraw::map(), radius(), and QwtScaleMap::transform().

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. Parameters: pen  Pen that is used for painting backbone and ticks font  Font used for painting the labels See also: setMinimumExtent(), minimumExtent() Warning: The implemented algo is not too smart and calculates only an upper limit, that might be a few pixels too large Implements QwtAbstractScaleDraw. Definition at line 269 of file qwt_round_scale_draw.cpp. References QwtScaleDiv::contains(), QwtAbstractScaleDraw::hasComponent(), QwtText::isEmpty(), QwtAbstractScaleDraw::label(), QwtAbstractScaleDraw::map(), QwtAbstractScaleDraw::scaleDiv(), QwtText::textSize(), QwtAbstractScaleDraw::tickLabel(), QwtScaleDiv::ticks(), and QwtScaleMap::transform(). Referenced by QwtKnob::minimumSizeHint().

void QwtRoundScaleDraw::moveCenter (  const QPoint &  center  )

Move the center of the scale draw, leaving the radius unchanged Parameters: center  New center See also: setRadius Definition at line 107 of file qwt_round_scale_draw.cpp.

QwtRoundScaleDraw & QwtRoundScaleDraw::operator= (  const QwtRoundScaleDraw &  other  )

Assignment operator. Definition at line 69 of file qwt_round_scale_draw.cpp. References d_data.

int QwtRoundScaleDraw::radius (   )  const

Get the radius Radius is the radius of the backbone without ticks and labels. See also: setRadius(), extent() Definition at line 96 of file qwt_round_scale_draw.cpp. Referenced by drawBackbone(), drawLabel(), and drawTick().

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. Parameters: angle1  angle2  boundaries of the angle interval in degrees. Warning: The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped. For angles more than 359 degrees above or below min(angle1, angle2), scale marks will not be drawn. If you need a counterclockwise scale, use QwtScaleDiv::setRange Definition at line 135 of file qwt_round_scale_draw.cpp. References QwtAbstractScaleDraw::scaleMap(), and QwtScaleMap::setPaintInterval(). Referenced by QwtKnob::setTotalAngle().

void QwtRoundScaleDraw::setRadius (  int  radius  )

Change of radius the scale Radius is the radius of the backbone without ticks and labels. Parameters: radius  New Radius See also: moveCenter Definition at line 84 of file qwt_round_scale_draw.cpp. Referenced by QwtRoundScaleDraw().

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