QwtPainter(3)

NAME
QwtPainter -

A collection of QPainter workarounds.

SYNOPSIS

#include <qwt_painter.h>

  Static Public Member Functions

static void setMetricsMap (const QPaintDevice *layout, const QPaintDevice *device)
static void setMetricsMap (const QwtMetricsMap &)
static void resetMetricsMap ()
static const QwtMetricsMap & metricsMap ()
static void setDeviceClipping (bool)
static bool deviceClipping ()
static const QRect & deviceClipRect ()
static void setClipRect (QPainter *, const QRect &)
static void drawText (QPainter *, int x, int y, const QString &)
static void drawText (QPainter *, const QPoint &, const QString &)
static void drawText (QPainter *, int x, int y, int w, int h, int flags, const QString &)
static void drawText (QPainter *, const QRect &, int flags, const QString &)
static void drawSimpleRichText (QPainter *, const QRect &, int flags, QTextDocument &)
static void drawRect (QPainter *, int x, int y, int w, int h)
static void drawRect (QPainter *, const QRect &rect)
static void fillRect (QPainter *, const QRect &, const QBrush &)
static void drawEllipse (QPainter *, const QRect &)
static void drawPie (QPainter *, const QRect &r, int a, int alen)
static void drawLine (QPainter *, int x1, int y1, int x2, int y2)
static void drawLine (QPainter *, const QPoint &p1, const QPoint &p2)
static void drawPolygon (QPainter *, const QwtPolygon &pa)
static void drawPolyline (QPainter *, const QwtPolygon &pa)
static void drawPoint (QPainter *, int x, int y)
static void drawRoundFrame (QPainter *, const QRect &, int width, const QPalette &, bool sunken)
static void drawFocusRect (QPainter *, QWidget *)
static void drawFocusRect (QPainter *, QWidget *, const QRect &)
static void drawColorBar (QPainter *painter, const QwtColorMap &, const QwtDoubleInterval &, const QwtScaleMap &, Qt::Orientation, const QRect &)
static QPen scaledPen (const QPen &)

Detailed Description

A collection of QPainter workarounds.

1) Clipping to coordinate system limits (Qt3 only)

On X11 pixel coordinates are stored in shorts. Qt produces overruns when mapping QCOORDS to shorts.

2) Scaling to device metrics

QPainter scales fonts, line and fill patterns to the metrics of the paint device. Other values like the geometries of rects, points remain device independend. To enable a device independent widget implementation, QwtPainter adds scaling of these geometries. (Unfortunately QPainter::scale scales both types of paintings, so the objects of the first type would be scaled twice).

Member Function Documentation

  bool QwtPainter::deviceClipping () [inline, static] Returns whether device clipping is enabled. On X11 the default is enabled, otherwise it is disabled.

See also:
    QwtPainter::setDeviceClipping()

  const QRect & QwtPainter::deviceClipRect () [static] Returns rect for device clipping

See also:
    QwtPainter::setDeviceClipping()

  void QwtPainter::drawEllipse (QPainter * painter, const QRect & rect) [static] Wrapper for QPainter::drawEllipse()

  void QwtPainter::drawLine (QPainter * painter, const QPoint & p1, const QPoint & p2) [inline, static]

Wrapper for QPainter::drawLine().

  void QwtPainter::drawLine (QPainter * painter, int x1, int y1, int x2, int y2) [static] Wrapper for QPainter::drawLine()

  void QwtPainter::drawPie (QPainter * painter, const QRect & rect, int a, int alen) [static] Wrapper for QPainter::drawPie()

  void QwtPainter::drawPoint (QPainter * painter, int x, int y) [static] Wrapper for QPainter::drawPoint()

  void QwtPainter::drawPolygon (QPainter * painter, const QwtPolygon & pa) [static] Wrapper for QPainter::drawPolygon()

  void QwtPainter::drawPolyline (QPainter * painter, const QwtPolygon & pa) [static] Wrapper for QPainter::drawPolyline()

  void QwtPainter::drawRect (QPainter * painter, const QRect & rect) [static] Wrapper for QPainter::drawRect()

  void QwtPainter::drawRect (QPainter * painter, int x, int y, int w, int h) [static] Wrapper for QPainter::drawRect()

  void QwtPainter::drawRoundFrame (QPainter * painter, const QRect & rect, int width, const QPalette & palette, bool sunken) [static]

Draw a round frame.

  void QwtPainter::drawSimpleRichText (QPainter * painter, const QRect & rect, int flags, QTextDocument & text) [static] Wrapper for QSimpleRichText::draw()

  void QwtPainter::drawText (QPainter * painter, const QRect & rect, int flags, const QString & text) [static] Wrapper for QPainter::drawText()

  void QwtPainter::drawText (QPainter * painter, int x, int y, int w, int h, int flags, const QString & text) [static] Wrapper for QPainter::drawText()

  void QwtPainter::drawText (QPainter * painter, const QPoint & pos, const QString & text) [static] Wrapper for QPainter::drawText()

  void QwtPainter::drawText (QPainter * painter, int x, int y, const QString & text) [static] Wrapper for QPainter::drawText()

  void QwtPainter::fillRect (QPainter * painter, const QRect & rect, const QBrush & brush) [static] Wrapper for QPainter::fillRect()

  const QwtMetricsMap & QwtPainter::metricsMap () [static] Returns:
    Metrics map

  void QwtPainter::resetMetricsMap () [static] Reset the metrics map to the ratio 1:1

See also:
    QwtPainter::setMetricsMap(), QwtPainter::resetMetricsMap()

  QPen QwtPainter::scaledPen (const QPen & pen) [static]

Scale a pen according to the layout metrics. The width of non cosmetic pens is scaled from screen to layout metrics, so that they look similar on paint devices with different resolutions.

Parameters:
    pen Unscaled pen

Returns:
    Scaled pen

  void QwtPainter::setClipRect (QPainter * painter, const QRect & rect) [static] Wrapper for QPainter::setClipRect()

  void QwtPainter::setDeviceClipping (bool enable) [static]

En/Disable device clipping. On X11 the default for device clipping is enabled, otherwise it is disabled.

See also:
    QwtPainter::deviceClipping()

  void QwtPainter::setMetricsMap (const QwtMetricsMap & map) [static] Change the metrics map

See also:
    QwtPainter::resetMetricsMap(), QwtPainter::metricsMap()

  void QwtPainter::setMetricsMap (const QPaintDevice * layout, const QPaintDevice * device) [static] Scale all QwtPainter drawing operations using the ratio QwtPaintMetrics(from).logicalDpiX() / QwtPaintMetrics(to).logicalDpiX() and QwtPaintMetrics(from).logicalDpiY() / QwtPaintMetrics(to).logicalDpiY()

See also:
    QwtPainter::resetScaleMetrics(), QwtPainter::scaleMetricsX(), QwtPainter::scaleMetricsY()

Author

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