Qwt User's Guide
6.0.2
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#include <qwt_null_paintdevice.h>
Public Member Functions | |
QwtNullPaintDevice (QPaintEngine::PaintEngineFeatures) | |
QwtNullPaintDevice (const QSize &size, QPaintEngine::PaintEngineFeatures) | |
virtual | ~QwtNullPaintDevice () |
virtual void | drawEllipse (const QRectF &) |
virtual void | drawEllipse (const QRect &) |
virtual void | drawImage (const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags) |
virtual void | drawLines (const QLine *, int) |
virtual void | drawLines (const QLineF *, int) |
virtual void | drawPath (const QPainterPath &) |
virtual void | drawPixmap (const QRectF &, const QPixmap &, const QRectF &) |
virtual void | drawPoints (const QPointF *, int) |
virtual void | drawPoints (const QPoint *, int) |
virtual void | drawPolygon (const QPointF *, int, QPaintEngine::PolygonDrawMode) |
virtual void | drawPolygon (const QPoint *, int, QPaintEngine::PolygonDrawMode) |
virtual void | drawRects (const QRect *, int) |
virtual void | drawRects (const QRectF *, int) |
virtual void | drawTextItem (const QPointF &, const QTextItem &) |
virtual void | drawTiledPixmap (const QRectF &, const QPixmap &, const QPointF &s) |
virtual int | metric (PaintDeviceMetric metric) const |
virtual QPaintEngine * | paintEngine () const |
void | setSize (const QSize &) |
QSize | size () const |
virtual void | updateState (const QPaintEngineState &state) |
A null paint device doing nothing.
Sometimes important layout/rendering geometries are not available or changable from the public Qt class interface. ( f.e hidden in the style implementation ).
QwtNullPaintDevice can be used to manipulate or filter out these informations by analyzing the stream of paint primitives.
F.e. QwtNullPaintDevice is used by QwtPlotCanvas to identify styled backgrounds with rounded corners.
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virtual |
See QPaintDevice::metric()
void QwtNullPaintDevice::setSize | ( | const QSize & | size | ) |
QSize QwtNullPaintDevice::size | ( | ) | const |