Man page - qwtroundscaledraw(3)

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Manual

QwtRoundScaleDraw

NAME
SYNOPSIS
Public Member Functions
Protected Member Functions
Additional Inherited Members
Detailed Description
Constructor & Destructor Documentation
QwtRoundScaleDraw::QwtRoundScaleDraw ()
Member Function Documentation
void QwtRoundScaleDraw::drawBackbone (QPainter * painter) const[protected], [virtual]
void QwtRoundScaleDraw::drawLabel (QPainter * painter, double value) const[protected], [virtual]
void QwtRoundScaleDraw::drawTick (QPainter * painter, double value, doublelen) const [protected], [virtual]
double QwtRoundScaleDraw::extent (const QFont & font) const [virtual]
void QwtRoundScaleDraw::moveCenter (const QPointF & center)
double QwtRoundScaleDraw::radius () const
void QwtRoundScaleDraw::setAngleRange (double angle1, double angle2)
void QwtRoundScaleDraw::setRadius (double radius)
Author

NAME

QwtRoundScaleDraw - A class for drawing round scales.

SYNOPSIS

#include <qwt_round_scale_draw.h>

Inherits QwtAbstractScaleDraw .

Inherited by QwtAnalogClockScaleDraw, and QwtCompassScaleDraw .

Public Member Functions

QwtRoundScaleDraw ()
Constructor.
virtual ˜QwtRoundScaleDraw ()
Destructor.
void setRadius (double radius )
double radius () const
void moveCenter (double x, double y)
Move the center of the scale draw, leaving the radius unchanged.
void moveCenter (const QPointF &)
QPointF center () const
Get the center of the scale.
void setAngleRange (double angle1, double angle2)
Adjust the baseline circle segment for round scales.
virtual double extent (const QFont &) const

Protected Member Functions

virtual void drawTick (QPainter *, double value, double len) const
virtual void drawBackbone (QPainter *) const
virtual void drawLabel (QPainter *, double val) const

Additional Inherited Members

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.

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].

Member Function Documentation

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

Draws the baseline of the scale

Parameters:

painter Painter

See also:

drawTick() , drawLabel()

Implements QwtAbstractScaleDraw .

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 .

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

Draw a tick

Parameters:

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

See also:

drawBackbone() , drawLabel()

Implements QwtAbstractScaleDraw .

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 .

void QwtRoundScaleDraw::moveCenter (const QPointF & center)

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

Parameters:

center New center

See also:

setRadius()

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()

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()

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()

Author

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