A class for drawing round scales. More...

#include <qwt_round_scale_draw.h>

Inheritance diagram for QwtRoundScaleDraw:

Classes
class	PrivateData
Public Member Functions
QPointF	center () const
	Get the center of the scale.
virtual double	extent (const QFont &) const
void	moveCenter (double x, double y)
	Move the center of the scale draw, leaving the radius unchanged.
void	moveCenter (const QPointF &)
	QwtRoundScaleDraw ()
	Constructor.
double	radius () const
void	setAngleRange (double angle1, double angle2)
	Adjust the baseline circle segment for round scales.
void	setRadius (double radius)
virtual	~QwtRoundScaleDraw ()
	Destructor.
Protected Member Functions
virtual void	drawBackbone (QPainter *) const
virtual void	drawLabel (QPainter *, double val) const
virtual void	drawTick (QPainter *, double val, double len) const
Private Attributes
PrivateData *	d_data

Detailed Description

A class for drawing round scales.

QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by setAngleRange(). The geometry of the scale can be specified with moveCenter() and 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 30 of file qwt_round_scale_draw.h.

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 45 of file qwt_round_scale_draw.cpp.

QwtRoundScaleDraw::~QwtRoundScaleDraw ( ) [virtual]

Destructor.

Definition at line 54 of file qwt_round_scale_draw.cpp.

Member Function Documentation

QPointF QwtRoundScaleDraw::center ( ) const

Get the center of the scale.

Definition at line 97 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 225 of file qwt_round_scale_draw.cpp.

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 146 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::drawTick	(	QPainter *	painter,
		double	value,
		double	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 191 of file qwt_round_scale_draw.cpp.

double QwtRoundScaleDraw::extent ( const QFont & font ) const [virtual]

Calculate the extent of the scale

The extent is the distance 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:

font	Font used for painting the labels

Returns:: Calculated extent

See also:: setMinimumExtent(), minimumExtent()

Warning:: The implemented algorithm is not too smart and calculates only an upper limit, that might be a few pixels too large

Implements QwtAbstractScaleDraw.

Definition at line 256 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::moveCenter	(	double	x,
		double	y
	)		`[inline]`

Move the center of the scale draw, leaving the radius unchanged.

Definition at line 58 of file qwt_round_scale_draw.h.

void QwtRoundScaleDraw::moveCenter ( const QPointF & center )

Move the center of the scale draw, leaving the radius unchanged

Parameters:

center New center

See also:: setRadius()

Definition at line 91 of file qwt_round_scale_draw.cpp.

double QwtRoundScaleDraw::radius ( ) const

Get the radius

Radius is the radius of the backbone without ticks and labels.

Returns:: Radius of the scale

See also:: setRadius(), extent()

Definition at line 80 of file qwt_round_scale_draw.cpp.

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 or equal than 360 degrees above or below min(angle1, angle2), scale marks will not be drawn.
If you need a counterclockwise scale, use QwtScaleDiv::setInterval()

Definition at line 119 of file qwt_round_scale_draw.cpp.

void QwtRoundScaleDraw::setRadius ( double 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 67 of file qwt_round_scale_draw.cpp.

Member Data Documentation

PrivateData* QwtRoundScaleDraw::d_data [private]

Reimplemented from QwtAbstractScaleDraw.

Definition at line 53 of file qwt_round_scale_draw.h.

The documentation for this class was generated from the following files:

Classes

Public Member Functions

Protected Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation