Qwt User's Guide: QwtNullPaintDevice Class Reference

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# QwtNullPaintDevice Class Reference

A null paint device doing nothing. More...

`#include <qwt_null_paintdevice.h>`

Inheritance diagram for QwtNullPaintDevice:
[legend]

List of all members.

## Public Member Functions
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 QLineF *, int)
virtual void | drawLines (const QLine *, int)
virtual void | drawPath (const QPainterPath &)
virtual void | drawPixmap (const QRectF &, const QPixmap &, const QRectF &)
virtual void | drawPoints (const QPoint *, int)
virtual void | drawPoints (const QPointF *, int)
virtual void | drawPolygon (const QPointF *, int, QPaintEngine::PolygonDrawMode)
virtual void | drawPolygon (const QPoint *, int, QPaintEngine::PolygonDrawMode)
virtual void | drawRects (const QRectF *, int)
virtual void | drawRects (const QRect *, 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
| QwtNullPaintDevice (const QSize &size, QPaintEngine::PaintEngineFeatures)
| QwtNullPaintDevice (QPaintEngine::PaintEngineFeatures)
void | setSize (const QSize &)
QSize | size () const
virtual void | updateState (const QPaintEngineState &state)
virtual | ~QwtNullPaintDevice ()

## Detailed Description

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.

## Constructor & Destructor Documentation

QwtNullPaintDevice::QwtNullPaintDevice | ( | QPaintEngine::PaintEngineFeatures | features | ) |

Constructor.

QwtNullPaintDevice::QwtNullPaintDevice | ( | const QSize & | size,
|  | QPaintEngine::PaintEngineFeatures | features
| ) |  |

Constructor.

QwtNullPaintDevice::~QwtNullPaintDevice | ( |  | ) | `[virtual]`

Destructor.

## Member Function Documentation

void QwtNullPaintDevice::drawEllipse | ( | const QRectF & | rect | ) | `[virtual]`

See QPaintEngine::drawEllipse()

void QwtNullPaintDevice::drawEllipse | ( | const QRect & | rect | ) | `[virtual]`

See QPaintEngine::drawEllipse()

void QwtNullPaintDevice::drawImage | ( | const QRectF & | rect,
|  | const QImage & | image,
|  | const QRectF & | subRect,
|  | Qt::ImageConversionFlags | flags
| ) |  | `[virtual]`

See QPaintEngine::drawImage()

void QwtNullPaintDevice::drawLines | ( | const QLineF * | lines,
|  | int | lineCount
| ) |  | `[virtual]`

See QPaintEngine::drawLines()

void QwtNullPaintDevice::drawLines | ( | const QLine * | lines,
|  | int | lineCount
| ) |  | `[virtual]`

See QPaintEngine::drawLines()

void QwtNullPaintDevice::drawPath | ( | const QPainterPath & | path | ) | `[virtual]`

See QPaintEngine::drawPath()

void QwtNullPaintDevice::drawPixmap | ( | const QRectF & | rect,
|  | const QPixmap & | pm,
|  | const QRectF & | subRect
| ) |  | `[virtual]`

See QPaintEngine::drawPixmap()

void QwtNullPaintDevice::drawPoints | ( | const QPointF * | points,
|  | int | pointCount
| ) |  | `[virtual]`

See QPaintEngine::drawPoints()

void QwtNullPaintDevice::drawPoints | ( | const QPoint * | points,
|  | int | pointCount
| ) |  | `[virtual]`

See QPaintEngine::drawPoints()

void QwtNullPaintDevice::drawPolygon | ( | const QPoint * | points,
|  | int | pointCount,
|  | QPaintEngine::PolygonDrawMode | mode
| ) |  | `[virtual]`

See QPaintEngine::drawPolygon()

void QwtNullPaintDevice::drawPolygon | ( | const QPointF * | points,
|  | int | pointCount,
|  | QPaintEngine::PolygonDrawMode | mode
| ) |  | `[virtual]`

See QPaintEngine::drawPolygon()

void QwtNullPaintDevice::drawRects | ( | const QRectF * | rects,
|  | int | rectCount
| ) |  | `[virtual]`

See QPaintEngine::drawRects()

void QwtNullPaintDevice::drawRects | ( | const QRect * | rects,
|  | int | rectCount
| ) |  | `[virtual]`

See QPaintEngine::drawRects()

void QwtNullPaintDevice::drawTextItem | ( | const QPointF & | pos,
|  | const QTextItem & | textItem
| ) |  | `[virtual]`

See QPaintEngine::drawTextItem()

void QwtNullPaintDevice::drawTiledPixmap | ( | const QRectF & | rect,
|  | const QPixmap & | pixmap,
|  | const QPointF & | s
| ) |  | `[virtual]`

See QPaintEngine::drawTiledPixmap()

int QwtNullPaintDevice::metric | ( | PaintDeviceMetric | metric | ) | const`[virtual]`

See QPaintDevice::metric()

See also:
  setSize()

QPaintEngine * QwtNullPaintDevice::paintEngine | ( |  | ) | const`[virtual]`

See QPaintDevice::paintEngine()

void QwtNullPaintDevice::setSize | ( | const QSize & | size | ) |

Set the size of the paint device

Parameters:

  size | Size

See also:
  size()

QSize QwtNullPaintDevice::size | ( |  | ) | const

Returns:
  Size of the paint device

See also:
  setSize()

void QwtNullPaintDevice::updateState | ( | const QPaintEngineState & | state | ) | `[virtual]`

See QPaintEngine::updateState()