QCPPaintBufferPixmap Class Reference

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

Inheritance diagram for QCPPaintBufferPixmap:

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

Protected Member Functions
virtual void	reallocateBuffer () Q_DECL_OVERRIDE

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

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.

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.

Member Function Documentation

clear()

void QCPPaintBufferPixmap::clear ( const QColor & color )

virtual

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.

draw()

void QCPPaintBufferPixmap::draw ( QCPPainter * painter ) const

virtual

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.

reallocateBuffer()

void QCPPaintBufferPixmap::reallocateBuffer ( )

protectedvirtual

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.

startPainting()

QCPPainter * QCPPaintBufferPixmap::startPainting ( )

virtual

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.

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

• qcustomplot.h
• qcustomplot.cpp