A abstract base class for drawing scales. Más...

#include <qwt_abstract_scale_draw.h>

Diagrama de herencias de QwtAbstractScaleDraw

Clases
class	PrivateData
Tipos públicos
enum	ScaleComponent { Backbone = 1, Ticks = 2, Labels = 4 }
Métodos públicos
	QwtAbstractScaleDraw ()
	Constructor.
	QwtAbstractScaleDraw (const QwtAbstractScaleDraw &)
	Copy constructor.
virtual	~QwtAbstractScaleDraw ()
	Destructor.
QwtAbstractScaleDraw &	operator= (const QwtAbstractScaleDraw &)
	Assignment operator.
void	setScaleDiv (const QwtScaleDiv &s)
const QwtScaleDiv &	scaleDiv () const
void	setTransformation (QwtScaleTransformation *)
const QwtScaleMap &	map () const
void	enableComponent (ScaleComponent, bool enable=true)
bool	hasComponent (ScaleComponent) const
void	setTickLength (QwtScaleDiv::TickType, int length)
int	tickLength (QwtScaleDiv::TickType) const
int	majTickLength () const
void	setSpacing (int margin)
	Set the spacing between tick and labels.
int	spacing () const
	Get the spacing.
virtual void	draw (QPainter *, const QColorGroup &) const
	Draw the scale.
virtual QwtText	label (double) const
	Convert a value into its representing label.
virtual int	extent (const QPen &, const QFont &) const =0
void	setMinimumExtent (int)
	Set a minimum for the extent.
int	minimumExtent () const
QwtScaleMap &	scaleMap ()
Métodos protegidos
virtual void	drawTick (QPainter *painter, double value, int len) const =0
virtual void	drawBackbone (QPainter *painter) const =0
virtual void	drawLabel (QPainter *painter, double value) const =0
void	invalidateCache ()
const QwtText &	tickLabel (const QFont &, double value) const
	Convert a value into its representing label and cache it.

Descripción detallada

A abstract base class for drawing scales.

QwtAbstractScaleDraw can be used to draw linear or logarithmic scales.

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.

Documentación de las enumeraciones miembro de la clase

enum QwtAbstractScaleDraw::ScaleComponent

Components of a scale

Backbone
Ticks
Labels

Ver también:: QwtAbstractScaleDraw::enableComponent, QwtAbstractScaleDraw::hasComponent

Valores de enumeraciones:

Backbone
Ticks
Labels

Documentación del constructor y destructor

QwtAbstractScaleDraw::QwtAbstractScaleDraw ( )

Constructor.

The range of the scale is initialized to [0, 100], The spacing (distance between ticks and labels) is set to 4, the tick lengths are set to 4,6 and 8 pixels

QwtAbstractScaleDraw::QwtAbstractScaleDraw ( const QwtAbstractScaleDraw & other )

Copy constructor.

QwtAbstractScaleDraw::~QwtAbstractScaleDraw ( ) [virtual]

Destructor.

Documentación de las funciones miembro

void QwtAbstractScaleDraw::draw	(	QPainter *	painter,
		const QColorGroup &	colorGroup
	)		const `[virtual]`

Draw the scale.

Parámetros:

painter	The painter
colorGroup	Color group, text color is used for the labels, foreground color for ticks and backbone

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

Draws the baseline of the scale

Parámetros:

painter Painter

Ver también:: drawTick(), drawLabel()

Implementado en QwtRoundScaleDraw y QwtScaleDraw.

virtual void QwtAbstractScaleDraw::drawLabel	(	QPainter *	painter,
		double	value
	)		const `[protected, pure virtual]`

Draws the label for a major scale tick

Parámetros:

painter	Painter
value	Value

Ver también:: drawTick, drawBackbone

Implementado en QwtRoundScaleDraw y QwtScaleDraw.

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

Draw a tick

Parámetros:

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

Ver también:: drawBackbone(), drawLabel()

Implementado en QwtRoundScaleDraw y QwtScaleDraw.

void QwtAbstractScaleDraw::enableComponent	(	ScaleComponent	component,
		bool	enable = `true`
	)

En/Disable a component of the scale

Parámetros:

component	Scale component
enable	On/Off

Ver también:: QwtAbstractScaleDraw::hasComponent

virtual int QwtAbstractScaleDraw::extent	(	const QPen &	,
		const QFont &
	)		const `[pure virtual]`

Calculate the extent

The extent is the distcance from the baseline to the outermost pixel of the scale draw in opposite to its orientation. It is at least minimumExtent() pixels.

Ver también:: setMinimumExtent(), minimumExtent()

Implementado en QwtRoundScaleDraw y QwtScaleDraw.

bool QwtAbstractScaleDraw::hasComponent ( ScaleComponent component ) const

Check if a component is enabled

Ver también:: QwtAbstractScaleDraw::enableComponent

void QwtAbstractScaleDraw::invalidateCache ( ) [protected]

Invalidate the cache used by QwtAbstractScaleDraw::tickLabel

The cache is invalidated, when a new QwtScaleDiv is set. If the labels need to be changed. while the same QwtScaleDiv is set, QwtAbstractScaleDraw::invalidateCache needs to be called manually.

QwtText QwtAbstractScaleDraw::label ( double value ) const [virtual]

Convert a value into its representing label.

The value is converted to a plain text using QLocale::system().toString(value). This method is often overloaded by applications to have individual labels.

Parámetros:

value Value

Devuelve:: Label string.

Reimplementado en QwtDialScaleDraw.

int QwtAbstractScaleDraw::majTickLength ( ) const

The same as QwtAbstractScaleDraw::tickLength(QwtScaleDiv::MajorTick).

const QwtScaleMap & QwtAbstractScaleDraw::map ( ) const

Devuelve:: Map how to translate between scale and pixel values

int QwtAbstractScaleDraw::minimumExtent ( ) const

Get the minimum extent

Ver también:: extent(), setMinimumExtent()

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

Assignment operator.

const QwtScaleDiv & QwtAbstractScaleDraw::scaleDiv ( ) const

Devuelve:: scale division

QwtScaleMap & QwtAbstractScaleDraw::scaleMap ( )

Devuelve:: Map how to translate between scale and pixel values

void QwtAbstractScaleDraw::setMinimumExtent ( int minExtent )

Set a minimum for the extent.

The extent is calculated from the coomponents of the scale draw. In situations, where the labels are changing and the layout depends on the extent (f.e scrolling a scale), setting an upper limit as minimum extent will avoid jumps of the layout.

Parámetros:

minExtent Minimum extent

Ver también:: extent(), minimumExtent()

void QwtAbstractScaleDraw::setScaleDiv ( const QwtScaleDiv & sd )

Change the scale division

Parámetros:

sd	New scale division

void QwtAbstractScaleDraw::setSpacing ( int spacing )

Set the spacing between tick and labels.

The spacing is the distance between ticks and labels. The default spacing is 4 pixels.

Parámetros:

spacing Spacing

Ver también:: QwtAbstractScaleDraw::spacing

void QwtAbstractScaleDraw::setTickLength	(	QwtScaleDiv::TickType	tickType,
		int	length
	)

Set the length of the ticks

Parámetros:

tickType	Tick type
length	New length

Atención:: the length is limited to [0..1000]

void QwtAbstractScaleDraw::setTransformation ( QwtScaleTransformation * transformation )

Change the transformation of the scale

Parámetros:

transformation New scale transformation

int QwtAbstractScaleDraw::spacing ( ) const

Get the spacing.

The spacing is the distance between ticks and labels. The default spacing is 4 pixels.

Ver también:: QwtAbstractScaleDraw::setSpacing

const QwtText & QwtAbstractScaleDraw::tickLabel	(	const QFont &	font,
		double	value
	)		const `[protected]`

Convert a value into its representing label and cache it.

The conversion between value and label is called very often in the layout and painting code. Unfortunately the calculation of the label sizes might be slow (really slow for rich text in Qt4), so it's necessary to cache the labels.

Parámetros:

font	Font
value	Value

Devuelve:: Tick label

int QwtAbstractScaleDraw::tickLength ( QwtScaleDiv::TickType tickType ) const

Return the length of the ticks

Ver también:: QwtAbstractScaleDraw::setTickLength, QwtAbstractScaleDraw::majTickLength

La documentación para esta clase fue generada a partir de los siguientes ficheros:

src/qwt/src/qwt_abstract_scale_draw.h
src/qwt/src/qwt_abstract_scale_draw.cpp

Clases

Tipos públicos

Métodos públicos

Métodos protegidos

Descripción detallada

Documentación de las enumeraciones miembro de la clase

Documentación del constructor y destructor

Documentación de las funciones miembro