A plot item, which displays a text label 更多...

#include <qwt_plot_textlabel.h>

类 QwtPlotTextLabel 继承关系图:

类
class	PrivateData

Public 成员函数
	QwtPlotTextLabel ()
	Constructor

virtual int	rtti () const override
	Get the runtime type information

void	setText (const QwtText &)
	Set the text

QwtText	text () const
	Get the text

void	setMargin (int margin)
	Set the margin

int	margin () const
	Get the margin

virtual QRectF	textRect (const QRectF &, const QSizeF &) const
	Align the text label

Public 成员函数继承自 QwtPlotItem
	QwtPlotItem ()
	Default constructor

	QwtPlotItem (const QString &title)
	Constructor with title as QString

	QwtPlotItem (const QwtText &title)
	Constructor with title as QwtText

virtual	~QwtPlotItem ()
	Destructor

virtual void	attach (QwtPlot *plot)
	Attach the item to a plot

void	detach ()
	Detach the item from the plot

QwtPlot *	plot () const
	Get the plot the item is attached to

void	setTitle (const QString &title)
	Set the title using a QString

void	setTitle (const QwtText &title)
	Set the title using a QwtText

const QwtText &	title () const
	Get the title

void	setItemAttribute (ItemAttribute, bool on=true)
	Set an item attribute

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute

void	setItemInterest (ItemInterest, bool on=true)
	Set an item interest

bool	testItemInterest (ItemInterest) const
	Test an item interest

void	setRenderHint (RenderHint, bool on=true)
	Set a render hint

bool	testRenderHint (RenderHint) const
	Test a render hint

void	setRenderThreadCount (uint numThreads)
	Set the number of render threads

uint	renderThreadCount () const
	Get the number of render threads

void	setLegendIconSize (const QSize &)
	Set the legend icon size

QSize	legendIconSize () const
	Get the legend icon size

double	z () const
	Get the z-value

void	setZ (double z)
	Set the z-value

void	show ()
	Show the item

void	hide ()
	Hide the item

virtual void	setVisible (bool)
	Set the visibility

bool	isVisible () const
	Check if the item is visible

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set both axes

void	setXAxis (QwtAxisId)
	Set the x-axis

QwtAxisId	xAxis () const
	Get the x-axis

void	setYAxis (QwtAxisId)
	Set the y-axis

QwtAxisId	yAxis () const
	Get the y-axis

virtual void	itemChanged ()
	Notify the plot that the item has changed

virtual void	legendChanged ()
	Notify the item that the legend has changed

virtual QRectF	boundingRect () const
	Get the bounding rectangle

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Get margin hints for the canvas

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
	Update the item with new scale divisions

virtual void	updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
	Update the item with changes of the legend

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the scale rectangle

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the paint rectangle

virtual QList< QwtLegendData >	legendData () const
	Return legend data

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const
	Return a legend icon

Protected 成员函数
virtual void	draw (QPainter *, const QwtScaleMap &, const QwtScaleMap &, const QRectF &) const override
	Draw the text label

void	invalidateCache ()
	Invalidate the cached pixmap

Protected 成员函数继承自 QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Create a default icon

额外继承的成员函数
Public 类型继承自 QwtPlotItem
enum	RttiValues { Rtti_PlotItem = 0 , Rtti_PlotGrid , Rtti_PlotScale , Rtti_PlotLegend , Rtti_PlotMarker , Rtti_PlotCurve , Rtti_PlotSpectroCurve , Rtti_PlotIntervalCurve , Rtti_PlotHistogram , Rtti_PlotSpectrogram , Rtti_PlotGraphic , Rtti_PlotTradingCurve , Rtti_PlotBarChart , Rtti_PlotMultiBarChart , Rtti_PlotShape , Rtti_PlotTextLabel , Rtti_PlotZone , Rtti_PlotVectorField , Rtti_PlotArrowMarker , Rtti_PlotBoxChart , Rtti_PlotUserItem = 1000 }
	Runtime type information 更多...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 , Margins = 0x04 }
	Plot Item Attributes 更多...

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	Plot Item Interests 更多...

enum	RenderHint { RenderAntialiased = 0x1 }
	Render hints 更多...

详细描述

A plot item, which displays a text label

QwtPlotTextLabel displays a text label aligned to the plot canvas.

     In opposite to QwtPlotMarker the position of the label is unrelated to
     plot coordinates.

     As drawing a text is an expensive operation the label is cached
     in a pixmap to speed up replots.

Example: The following code shows how to add a title.
QwtText title( "Plot Title" );

title.setRenderFlags( Qt::AlignHCenter | Qt::AlignTop );

QFont font;

font.setBold( true );

title.setFont( font );

QwtPlotTextLabel *titleItem = new QwtPlotTextLabel();

titleItem->setText( title );

titleItem->attach( plot );

QwtPlotItem::title
const QwtText & title() const
Get the title
Definition qwt_plot_item.cpp:239

QwtPlotItem::plot
QwtPlot * plot() const
Get the plot the item is attached to
Definition qwt_plot_item.cpp:164

QwtPlotItem::attach
virtual void attach(QwtPlot *plot)
Attach the item to a plot
Definition qwt_plot_item.cpp:118

QwtPlotTextLabel
A plot item, which displays a text label
Definition qwt_plot_textlabel.h:65

QwtPlotTextLabel::QwtPlotTextLabel
QwtPlotTextLabel()
Constructor
Definition qwt_plot_textlabel.cpp:83

QwtPlotTextLabel::setText
void setText(const QwtText &)
Set the text
Definition qwt_plot_textlabel.cpp:116

QwtText
A class representing a text
Definition qwt_text.h:70

QwtText::setFont
void setFont(const QFont &)
Set the font
Definition qwt_text.cpp:393

QwtText::setRenderFlags
void setRenderFlags(int)
Change the render flags
Definition qwt_text.cpp:365