A class which draws a scale inside the plot canvas. Más...

#include <qwt_plot_scaleitem.h>

Diagrama de herencias de QwtPlotScaleItem

Clases
class	PrivateData
Métodos públicos
	QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale, const double pos=0.0)
	Constructor for scale item at the position pos.
virtual	~QwtPlotScaleItem ()
	Destructor.
virtual int	rtti () const
void	setScaleDiv (const QwtScaleDiv &)
	Assign a scale division.
const QwtScaleDiv &	scaleDiv () const
void	setScaleDivFromAxis (bool on)
bool	isScaleDivFromAxis () const
void	setColorGroup (const QColorGroup &)
QColorGroup	colorGroup () const
void	setFont (const QFont &)
QFont	font () const
void	setScaleDraw (QwtScaleDraw *)
	Set a scale draw.
const QwtScaleDraw *	scaleDraw () const
QwtScaleDraw *	scaleDraw ()
void	setPosition (double pos)
double	position () const
void	setBorderDistance (int numPixels)
	Align the scale to the canvas.
int	borderDistance () const
void	setAlignment (QwtScaleDraw::Alignment)
virtual void	draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &rect) const
	Draw the scale.
virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
	Update the item to changes of the axes scale division.

Descripción detallada

A class which draws a scale inside the plot canvas.

QwtPlotScaleItem can be used to draw an axis inside the plot canvas. It might by synchronized to one of the axis of the plot, but can also display its own ticks and labels.

It is allowed to synchronize the scale item with a disabled axis. In plots with vertical and horizontal scale items, it might be necessary to remove ticks at the intersections, by overloading updateScaleDiv().

The scale might be at a specific position (f.e 0.0) or it might be aligned to a canvas border.

Example

The following example shows how to replace the left axis, by a scale item at the x position 0.0.

QwtPlotScaleItem *scaleItem = 
    new QwtPlotScaleItem(QwtScaleDraw::RightScale, 0.0);
scaleItem->setFont(plot->axisWidget(QwtPlot::yLeft)->font());
scaleItem->attach(plot);

plot->enableAxis(QwtPlot::yLeft, false);

Documentación del constructor y destructor

QwtPlotScaleItem::QwtPlotScaleItem	(	QwtScaleDraw::Alignment	alignment = `QwtScaleDraw::BottomScale`,
		const double	pos = `0.0`
	)		`[explicit]`

Constructor for scale item at the position pos.

Parámetros:

alignment	In case of QwtScaleDraw::BottomScale/QwtScaleDraw::TopScale the scale item is corresponding to the xAxis(), otherwise it corresponds to the yAxis().
position	x or y position, depending on the corresponding axis.

Ver también:: setPosition(), setAlignment()

QwtPlotScaleItem::~QwtPlotScaleItem ( ) [virtual]

Destructor.

Documentación de las funciones miembro

int QwtPlotScaleItem::borderDistance ( ) const

Devuelve:: Distance from a canvas border

Ver también:: setBorderDistance(), setPosition()

QColorGroup QwtPlotScaleItem::colorGroup ( ) const

Devuelve:: color group

Ver también:: setColorGroup()

void QwtPlotScaleItem::draw	(	QPainter *	p,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRect &	rect
	)		const `[virtual]`

Draw the scale.

Implementa QwtPlotItem.

QFont QwtPlotScaleItem::font ( ) const

Devuelve:: tick label font

Ver también:: setFont()

bool QwtPlotScaleItem::isScaleDivFromAxis ( ) const

Devuelve:: True, if the synchronization of the scale division with the corresponding axis is enabled.

Ver también:: setScaleDiv(), setScaleDivFromAxis()

double QwtPlotScaleItem::position ( ) const

Devuelve:: Position of the scale

Ver también:: setPosition(), setAlignment()

int QwtPlotScaleItem::rtti ( ) const [virtual]

Devuelve:: QwtPlotItem::Rtti_PlotScale

Reimplementado de QwtPlotItem.

const QwtScaleDiv & QwtPlotScaleItem::scaleDiv ( ) const

Devuelve:: Scale division

const QwtScaleDraw * QwtPlotScaleItem::scaleDraw ( ) const

Devuelve:: Scale draw

Ver también:: setScaleDraw()

QwtScaleDraw * QwtPlotScaleItem::scaleDraw ( )

Devuelve:: Scale draw

Ver también:: setScaleDraw()

void QwtPlotScaleItem::setAlignment ( QwtScaleDraw::Alignment alignment )

Change the alignment of the scale

The alignment sets the orientation of the scale and the position of the ticks:

QwtScaleDraw::BottomScale: horizontal, ticks below
QwtScaleDraw::TopScale: horizontal, ticks above
QwtScaleDraw::LeftScale: vertical, ticks left
QwtScaleDraw::RightScale: vertical, ticks right

For horizontal scales the position corresponds to QwtPlotItem::yAxis(), otherwise to QwtPlotItem::xAxis().

Ver también:: scaleDraw(), QwtScaleDraw::alignment(), setPosition()

void QwtPlotScaleItem::setBorderDistance ( int distance )

Align the scale to the canvas.

If distance is >= 0 the scale will be aligned to a border of the contents rect of the canvas. If alignment() is QwtScaleDraw::LeftScale, the scale will be aligned to the right border, if it is QwtScaleDraw::TopScale it will be aligned to the bottom (and vice versa),

If distance is < 0 the scale will be at the position().

Parámetros:

distance Number of pixels between the canvas border and the backbone of the scale.

Ver también:: setPosition(), borderDistance()

void QwtPlotScaleItem::setColorGroup ( const QColorGroup & colorGroup )

Set the color group

Ver también:: QwtAbstractScaleDraw::draw(), colorGroup()

void QwtPlotScaleItem::setFont ( const QFont & font )

Change the tick label font

Ver también:: font

void QwtPlotScaleItem::setPosition ( double pos )

Change the position of the scale

The position is interpreted as y value for horizontal axes and as x value for vertical axes.

The border distance is set to -1.

Ver también:: position(), setAlignment()

void QwtPlotScaleItem::setScaleDiv ( const QwtScaleDiv & scaleDiv )

Assign a scale division.

When assigning a scaleDiv the scale division won't be synchronized with the corresponding axis anymore.

Parámetros:

scaleDiv Scale division

Ver también:: scaleDiv(), setScaleDivFromAxis(), isScaleDivFromAxis()

void QwtPlotScaleItem::setScaleDivFromAxis ( bool on )

Enable/Disable the synchronization of the scale division with the corresponding axis.

Ver también:: isScaleDivFromAxis()

void QwtPlotScaleItem::setScaleDraw ( QwtScaleDraw * scaleDraw )

Set a scale draw.

Parámetros:

axisId	axis index
scaleDraw	object responsible for drawing scales.

The main use case for replacing the default QwtScaleDraw is to overload QwtAbstractScaleDraw::label, to replace or swallow tick labels.

Ver también:: scaleDraw()

void QwtPlotScaleItem::updateScaleDiv	(	const QwtScaleDiv &	xScaleDiv,
		const QwtScaleDiv &	yScaleDiv
	)		`[virtual]`

Update the item to changes of the axes scale division.

In case of isScaleDivFromAxis(), the scale draw is synchronized to the correspond axis.

Parámetros:

xScaleDiv	Scale division of the x-axis
yScaleDiv	Scale division of the y-axis

Ver también:: QwtPlot::updateAxes()

Reimplementado de QwtPlotItem.

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

src/qwt/src/qwt_plot_scaleitem.h
src/qwt/src/qwt_plot_scaleitem.cpp

Clases

Métodos públicos

Descripción detallada

Documentación del constructor y destructor

Documentación de las funciones miembro