qwtroundscaledraw(3)

NAME

QwtRoundScaleDraw

SYNOPSIS

Inherits QwtAbstractScaleDraw.
Inherited by QwtDialScaleDraw.

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

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.

Member Function Documentation

QwtRoundScaleDraw & QwtRoundScaleDraw::operator= (const QwtRoundScaleDraw &

other)
Assignment operator.

Definition at line 69 of file qwt_round_scale_draw.cpp.

References d_data.

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().

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::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.

QPoint QwtRoundScaleDraw::center () const

Get the center of the scale.

Definition at line 113 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 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().

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 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
Parameters:

painter Painter
value Value of the tick
len Lenght of the tick

See also:

drawBackbone(), drawLabel()

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
Parameters:

painter Painter

See also:

drawTick(), drawLabel()

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
Parameters:

painter Painter
value Value

See also:

drawTick(), drawBackbone()

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().

Author

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Version 5.1.1 24 May 2008 QwtRoundScaleDraw(3)