An alternative canvas for a QwtPlot derived from QGLWidget 更多...

#include <qwt_plot_glcanvas.h>

类 QwtPlotGLCanvas 继承关系图:

类
class	PrivateData

Public 槽
void	replot ()
	Replot the canvas

Public 成员函数
	QwtPlotGLCanvas (QwtPlot *=nullptr)
	Constructor

	QwtPlotGLCanvas (const QGLFormat &, QwtPlot *=nullptr)
	Constructor with QGLFormat

	~QwtPlotGLCanvas () override
	Destructor

virtual Q_INVOKABLE void	invalidateBackingStore () override
	Invalidate the backing store

Q_INVOKABLE QPainterPath	borderPath (const QRect &) const
	Get the border path

virtual bool	event (QEvent *) override
	Handle events

Public 成员函数继承自 QwtPlotAbstractGLCanvas
	QwtPlotAbstractGLCanvas (QWidget *canvasWidget)
	Paint attributes

void	setPaintAttribute (PaintAttribute, bool on=true)
	Changing the paint attributes

bool	testPaintAttribute (PaintAttribute) const
	Test whether a paint attribute is enabled

void	setFrameStyle (int style)
	Set the frame style

int	frameStyle () const
	Get the frame style

void	setFrameShadow (QFrame::Shadow)
	Set the frame shadow

QFrame::Shadow	frameShadow () const
	Get the frame shadow

void	setFrameShape (QFrame::Shape)
	Set the frame shape

QFrame::Shape	frameShape () const
	Get the frame shape

void	setLineWidth (int)
	Set the frame line width

int	lineWidth () const
	Get the line width of the frame

void	setMidLineWidth (int)
	Set the frame mid line width

int	midLineWidth () const
	Get the midline width of the frame

int	frameWidth () const
	Get the frame width depending on the style, line width and midline width

QRect	frameRect () const
	Get the rectangle where the frame is drawn in

Public 成员函数继承自 QwtPlotAbstractCanvas
	QwtPlotAbstractCanvas (QWidget *canvasWidget)
	Constructor

QwtPlot *	plot ()
	Return parent plot widget

const QwtPlot *	plot () const
	Return parent plot widget

void	setFocusIndicator (FocusIndicator)
	Set the focus indicator

FocusIndicator	focusIndicator () const
	Get the focus indicator

void	setBorderRadius (double)
	Set the radius for the corners of the border frame

double	borderRadius () const
	Get the radius for the corners of the border frame

Protected 成员函数
virtual void	paintEvent (QPaintEvent *) override
	Paint event handler

virtual void	initializeGL () override
	Initialize OpenGL

virtual void	paintGL () override
	Paint OpenGL scene

virtual void	resizeGL (int width, int height) override
	Resize OpenGL view

Protected 成员函数继承自 QwtPlotAbstractGLCanvas
void	replot ()
	Invalidate the paint cache and repaint the canvas

void	draw (QPainter *)
	Helper function for the derived plot canvas

Protected 成员函数继承自 QwtPlotAbstractCanvas
QWidget *	canvasWidget ()

const QWidget *	canvasWidget () const

virtual void	drawFocusIndicator (QPainter *)
	Draw the focus indication

virtual void	drawBorder (QPainter *)
	Draw the border of the canvas

virtual void	drawBackground (QPainter *)
	Helper function for the derived plot canvas

void	fillBackground (QPainter *)
	Helper function for the derived plot canvas

void	drawCanvas (QPainter *)
	Draw the plot to the canvas

void	drawStyled (QPainter *, bool)
	Helper function for the derived plot canvas

void	drawUnstyled (QPainter *)
	Helper function for the derived plot canvas

QPainterPath	canvasBorderPath (const QRect &rect) const

void	updateStyleSheetInfo ()
	Update the cached information about the current style sheet

属性
QFrame::Shadow	frameShadow

QFrame::Shape	frameShape

int	lineWidth

int	midLineWidth

int	frameWidth

QRect	frameRect

double	borderRadius

额外继承的成员函数
Public 类型继承自 QwtPlotAbstractGLCanvas
enum	PaintAttribute { BackingStore = 1 , ImmediatePaint = 8 }
	Paint attributes 更多...

Public 类型继承自 QwtPlotAbstractCanvas
enum	FocusIndicator { NoFocusIndicator , CanvasFocusIndicator , ItemFocusIndicator }
	Focus indicator 更多...

详细描述

An alternative canvas for a QwtPlot derived from QGLWidget

QwtPlotGLCanvas implements the very basics to act as canvas inside of a QwtPlot widget. It might be extended to a full featured alternative to QwtPlotCanvas in a future version of Qwt.

Even if QwtPlotGLCanvas is not derived from QFrame it imitates its API. When using style sheets it supports the box model - beside backgrounds with rounded borders.

Since Qt 5.4 QOpenGLWidget is available, that is used by QwtPlotOpenGLCanvas.

参见: QwtPlot::setCanvas(), QwtPlotCanvas, QwtPlotOpenGLCanvas

注解: With Qt4 you might want to use the QPaintEngine::OpenGL paint engine ( see QGL::setPreferredPaintEngine() ). On a Linux test system QPaintEngine::OpenGL2 shows very basic problems like translated geometries.; Another way for getting hardware accelerated graphics is using an OpenGL offscreen buffer ( QwtPlotCanvas::OpenGLBuffer ) with QwtPlotCanvas. Performance is worse, than rendering straight to a QGLWidget, but is usually better integrated into a desktop application.

构造及析构函数说明

◆ QwtPlotGLCanvas()

QwtPlotGLCanvas::QwtPlotGLCanvas ( QwtPlot * plot = nullptr )

explicit

Constructor

参数

[in] plot Parent plot widget

参见: QwtPlot::setCanvas()

Constructor

参数

[in]	format	OpenGL rendering options
[in]	plot	Parent plot widget

参见: QwtPlot::setCanvas()

Destructor

成员函数说明

◆ borderPath()

QPainterPath QwtPlotGLCanvas::borderPath ( const QRect & rect ) const

Get the border path

Calculate the painter path for a styled or rounded border

When the canvas has no styled background or rounded borders the painter path is empty.

参数

[in] rect Bounding rectangle of the canvas

返回: Painter path, that can be used for clipping

◆ event()

bool QwtPlotGLCanvas::event ( QEvent * event )

overridevirtual

Handle events

Qt event handler for QEvent::PolishRequest and QEvent::StyleChange

参数

[in] event Qt Event

返回: See QGLWidget::event()

◆ initializeGL()

void QwtPlotGLCanvas::initializeGL ( )

overrideprotectedvirtual

Initialize OpenGL

No operation - reserved for some potential use in the future

◆ invalidateBackingStore()

void QwtPlotGLCanvas::invalidateBackingStore ( )

overridevirtual

Invalidate the backing store

Invalidate the internal backing store

实现了 QwtPlotAbstractGLCanvas.

◆ paintEvent()

void QwtPlotGLCanvas::paintEvent ( QPaintEvent * event )

overrideprotectedvirtual

Paint event handler

Paint event

参数

event Paint event

参见: QwtPlot::drawCanvas()

◆ paintGL()

void QwtPlotGLCanvas::paintGL ( )

overrideprotectedvirtual

Paint OpenGL scene

Paint the plot

◆ replot

void QwtPlotGLCanvas::replot ( )

slot

Replot the canvas

Invalidate the paint cache and repaint the canvas

参见: invalidatePaintCache()

◆ resizeGL()

void QwtPlotGLCanvas::resizeGL	(	int	width,
		int	height
	)

overrideprotectedvirtual

Resize OpenGL view

No operation - reserved for some potential use in the future

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_plot_glcanvas.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_glcanvas.cpp

类

Public 槽

Public 成员函数

Protected 成员函数

属性

额外继承的成员函数

详细描述

构造及析构函数说明

◆ QwtPlotGLCanvas()

成员函数说明

◆ borderPath()

◆ event()

◆ initializeGL()

◆ invalidateBackingStore()

◆ paintEvent()

◆ paintGL()

◆ replot

◆ resizeGL()