QCPPaintBufferPixmap Class Reference

Inheritance diagram for QCPPaintBufferPixmap:

Public Member Functions
	QCPPaintBufferPixmap (const QSize &size, double devicePixelRatio)
void	clear (const QColor &color) override
virtual void	draw (QCPPainter *painter) const override
virtual QCPPainter *	startPainting () override
Public Member Functions inherited from QCPAbstractPaintBuffer
	QCPAbstractPaintBuffer (const QSize &size, double devicePixelRatio)
double	devicePixelRatio () const
virtual void	donePainting ()
bool	invalidated () const
void	setDevicePixelRatio (double ratio)
void	setInvalidated (bool invalidated=true)
void	setSize (const QSize &size)
QSize	size () const

Protected Member Functions
virtual void	reallocateBuffer () override

Protected Attributes
QPixmap	mBuffer
Protected Attributes inherited from QCPAbstractPaintBuffer
double	mDevicePixelRatio
bool	mInvalidated
QSize	mSize

Detailed Description

A paint buffer based on QPixmap, using software raster rendering.

This paint buffer is the default and fall-back paint buffer which uses software rendering and QPixmap as internal buffer. It is used if QCustomPlot::setOpenGl is false.

Definition at line 552 of file qcustomplot.h.

Constructor & Destructor Documentation

QCPPaintBufferPixmap()

QCPPaintBufferPixmap::QCPPaintBufferPixmap ( const QSize & size, double devicePixelRatio )

explicit

Creates a pixmap paint buffer instancen with the specified size and devicePixelRatio, if applicable.

Definition at line 649 of file qcustomplot.cpp.

~QCPPaintBufferPixmap()

QCPPaintBufferPixmap::~QCPPaintBufferPixmap ( )

overridevirtual

Definition at line 655 of file qcustomplot.cpp.

Member Function Documentation

clear()

void QCPPaintBufferPixmap::clear ( const QColor & color )

overridevirtual

Fills the entire buffer with the provided color. To have an empty transparent buffer, use the named color Qt::transparent.

This method must not be called if there is currently a painter (acquired with startPainting) active.

Implements QCPAbstractPaintBuffer.

Definition at line 679 of file qcustomplot.cpp.

draw()

void QCPPaintBufferPixmap::draw ( QCPPainter * painter ) const

overridevirtual

Draws the contents of this buffer with the provided painter. This is the method that is used to finally join all paint buffers and draw them onto the screen.

Implements QCPAbstractPaintBuffer.

Definition at line 670 of file qcustomplot.cpp.

reallocateBuffer()

void QCPPaintBufferPixmap::reallocateBuffer ( )

overrideprotectedvirtual

Reallocates the internal buffer with the currently configured size (setSize) and device pixel ratio, if applicable (setDevicePixelRatio). It is called as soon as any of those properties are changed on this paint buffer.

Note

Subclasses of QCPAbstractPaintBuffer must call their reimplementation of this method in their constructor, to perform the first allocation (this can not be done by the base class because calling pure virtual methods in base class constructors is not possible).

Implements QCPAbstractPaintBuffer.

Definition at line 685 of file qcustomplot.cpp.

startPainting()

QCPPainter * QCPPaintBufferPixmap::startPainting ( )

overridevirtual

Returns a QCPPainter which is ready to draw to this buffer. The ownership and thus the responsibility to delete the painter after the painting operations are complete is given to the caller of this method.

Once you are done using the painter, delete the painter and call donePainting.

While a painter generated with this method is active, you must not call setSize, setDevicePixelRatio or clear.

This method may return 0, if a painter couldn't be activated on the buffer. This usually indicates a problem with the respective painting backend.

Implements QCPAbstractPaintBuffer.

Definition at line 660 of file qcustomplot.cpp.

Member Data Documentation

mBuffer

QPixmap QCPPaintBufferPixmap::mBuffer

protected

Definition at line 565 of file qcustomplot.h.

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

• qcustomplot.h
• qcustomplot.cpp