QwtCompassScaleDraw Class Reference

A special scale draw made for QwtCompass. More...

#include <qwt_compass.h>

Inheritance diagram for QwtCompassScaleDraw:

Classes
class	PrivateData

Public Member Functions
	QwtCompassScaleDraw ()
	Constructor.
	QwtCompassScaleDraw (const QMap< double, QString > &map)
void	setLabelMap (const QMap< double, QString > &map)
	Set a map, mapping values to labels.
QMap< double, QString >	labelMap () const
	Get the map, mapping values to labels.
virtual QwtText	label (double value) const override
	Map a value to a corresponding label.
Public Member Functions inherited from QwtRoundScaleDraw
	QwtRoundScaleDraw ()
	Constructor.
	~QwtRoundScaleDraw () override
	Destructor.
void	setRadius (double radius)
	Set the radius.
double	radius () const
	Get the radius.
void	moveCenter (double x, double y)
	Move the center.
void	moveCenter (const QPointF &)
	Move the center.
QPointF	center () const
	Get the center of the scale.
void	setAngleRange (double angle1, double angle2)
	Set the angle range.
virtual double	extent (const QFont &) const override
	Calculate the extent of the scale.
Public Member Functions inherited from QwtAbstractScaleDraw
	QwtAbstractScaleDraw ()
	Constructor for QwtAbstractScaleDraw.
void	setScaleDiv (const QwtScaleDiv &)
	Set the scale division.
const QwtScaleDiv &	scaleDiv () const
	Return the scale division.
void	setTransformation (QwtTransform *)
	Set the scale transformation.
const QwtScaleMap &	scaleMap () const
	Return the scale map (const version)
QwtScaleMap &	scaleMap ()
	Return the scale map (non-const version)
void	enableComponent (ScaleComponent, bool enable=true)
	Enable or disable a scale component.
bool	hasComponent (ScaleComponent) const
	Check if a component is enabled.
void	setTickLength (QwtScaleDiv::TickType, double length)
	Set the length of the ticks.
double	tickLength (QwtScaleDiv::TickType) const
	Get the length of the ticks.
double	maxTickLength () const
	Get the length of the longest tick.
void	setSpacing (double)
	Set the spacing between tick and labels.
double	spacing () const
	Get the spacing.
void	setPenWidthF (qreal width)
	Specify the width of the scale pen.
qreal	penWidthF () const
	Get the scale pen width.
void	setSelected (bool on)
	Set whether the scale draw is selected.
bool	isSelected () const
	Check if the scale draw is selected.
void	setSelectedPenWidthOffset (qreal offset=1)
	Set the pen width offset for the axis when it is in selected state.
qreal	selectedPenWidthOffset () const
	Get the current pen width offset for the axis when it is in selected state.
virtual void	draw (QPainter *, const QPalette &) const
	Draw the scale.
void	setMinimumExtent (double)
	Set a minimum for the extent.
double	minimumExtent () const
	Get the minimum extent.
void	invalidateCache ()
	Invalidate the cache used by tickLabel()

Additional Inherited Members
Public Types inherited from QwtAbstractScaleDraw
enum	ScaleComponent { Backbone = 0x01 , Ticks = 0x02 , Labels = 0x04 }
	Components of a scale. More...
Protected Member Functions inherited from QwtRoundScaleDraw
virtual void	drawTick (QPainter *, double value, double len) const override
	Draw a tick.
virtual void	drawBackbone (QPainter *) const override
	Draws the baseline of the scale.
virtual void	drawLabel (QPainter *, double value) const override
	Draws the label for a major scale tick.
Protected Member Functions inherited from QwtAbstractScaleDraw
const QwtText &	tickLabel (const QFont &, double value) const
	Convert a value into its representing label and cache it.

Detailed Description

A special scale draw made for QwtCompass.

QwtCompassScaleDraw maps values to strings using a special map, that can be modified by the application. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.

See also

QwtCompass

Constructor & Destructor Documentation

QwtCompassScaleDraw()

QwtCompassScaleDraw::QwtCompassScaleDraw ( )

explicit

Constructor.

Initializes a label map for multiples of 45 degrees. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.

Constructor

Parameters

[in]

map

Value to label map

Destructor

Member Function Documentation

label()

QwtText QwtCompassScaleDraw::label ( double  value ) const

overridevirtual

Map a value to a corresponding label.

Parameters

[in]

value

Value that will be mapped

label() looks in the labelMap() for a corresponding label for value or returns a null text.

Returns

Label corresponding to the value, or null text if not found

See also

labelMap(), setLabelMap()

Reimplemented from QwtAbstractScaleDraw.

labelMap()

QMap< double, QString > QwtCompassScaleDraw::labelMap

(

)

const

Get the map, mapping values to labels.

Returns

Map, mapping values to labels

See also

setLabelMap()

setLabelMap()

void QwtCompassScaleDraw::setLabelMap

(

const QMap< double, QString > &

map

)

Set a map, mapping values to labels.

Parameters

[in]

map

Value to label map

The values of the major ticks are found by looking into this map. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.

Warning

The map will have no effect for values that are no major tick values. Major ticks can be changed by QwtScaleDraw::setScale.

See also

labelMap(), scaleDraw(), setScale()

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

• /home/runner/work/QWT/QWT/src/plot/qwt_compass.h
• /home/runner/work/QWT/QWT/src/plot/qwt_compass.cpp