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 Member Functions inherited from QCPAbstractPaintBuffer |
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 609 of file qcustomplot.h.
Constructor & Destructor Documentation
◆ QCPPaintBufferPixmap()
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explicit |
Creates a pixmap paint buffer instancen with the specified size and devicePixelRatio, if applicable.
Definition at line 667 of file qcustomplot.cpp.
◆ ~QCPPaintBufferPixmap()
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overridevirtual |
Definition at line 673 of file qcustomplot.cpp.
Member Function Documentation
◆ clear()
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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 697 of file qcustomplot.cpp.
◆ draw()
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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 688 of file qcustomplot.cpp.
◆ reallocateBuffer()
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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 703 of file qcustomplot.cpp.
◆ startPainting()
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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 678 of file qcustomplot.cpp.
Member Data Documentation
◆ mBuffer
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protected |
Definition at line 622 of file qcustomplot.h.
The documentation for this class was generated from the following files:
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