Public Types¶

enum RescalePolicy { Fixed, Expanding, Fitting }
enum ExpandingDirection { ExpandUp, ExpandDown, ExpandBoth }

Public Member Functions¶

QwtPlotRescaler (QWidget *canvas, QwtAxisId referenceAxis=QwtAxis::XBottom, RescalePolicy=Expanding)
virtual ~QwtPlotRescaler ()
Destructor. void setEnabled (bool)
En/disable the rescaler. bool isEnabled () const
void setRescalePolicy (RescalePolicy)
RescalePolicy rescalePolicy () const
void setExpandingDirection (ExpandingDirection)
void setExpandingDirection (QwtAxisId, ExpandingDirection)
ExpandingDirection expandingDirection (QwtAxisId) const
void setReferenceAxis (QwtAxisId)
QwtAxisId referenceAxis () const
void setAspectRatio (double ratio)
void setAspectRatio (QwtAxisId, double ratio)
double aspectRatio (QwtAxisId) const
void setIntervalHint (QwtAxisId, const QwtInterval &)
QwtInterval intervalHint (QwtAxisId) const
QWidget * canvas ()
const QWidget * canvas () const
QwtPlot * plot ()
const QwtPlot * plot () const
virtual bool eventFilter (QObject *, QEvent *) override
Event filter for the plot canvas. void rescale () const
Adjust the plot axes scales.

Protected Member Functions¶

virtual void canvasResizeEvent (QResizeEvent *)
virtual void rescale (const QSize &oldSize, const QSize &newSize) const
virtual QwtInterval expandScale (QwtAxisId, const QSize &oldSize, const QSize &newSize) const
virtual QwtInterval syncScale (QwtAxisId, const QwtInterval &reference, const QSize &size) const
virtual void updateScales (QwtInterval intervals[QwtAxis::AxisPositions]) const
Qt::Orientation orientation (QwtAxisId) const
QwtInterval interval (QwtAxisId) const
QwtInterval expandInterval (const QwtInterval &, double width, ExpandingDirection) const

enum QwtPlotRescaler::ExpandingDirection¶

When rescalePolicy() is set to Expanding its direction depends on ExpandingDirection

Enumerator

ExpandUp

The upper limit of the scale is adjusted.

ExpandDown

The lower limit of the scale is adjusted.

ExpandBoth

Both limits of the scale are adjusted.

Definition at line 70 of file qwt_plot_rescaler.h.

enum QwtPlotRescaler::RescalePolicy¶

The rescale policy defines how to rescale the reference axis and their depending axes.

See also

Enumerator

Fixed

The interval of the reference axis remains unchanged, when the geometry of the canvas changes. All other axes will be adjusted according to their aspect ratio.

Expanding

The interval of the reference axis will be shrunk/expanded, when the geometry of the canvas changes. All other axes will be adjusted according to their aspect ratio.

The interval, that is represented by one pixel is fixed.

Fitting

The intervals of the axes are calculated, so that all axes include their interval hint.

Definition at line 40 of file qwt_plot_rescaler.h.

QwtPlotRescaler::QwtPlotRescaler (QWidget * canvas, QwtAxisId referenceAxis = QwtAxis::XBottom, RescalePolicy policy = Expanding) [explicit]¶

Constructor

Parameters

See also

Definition at line 71 of file qwt_plot_rescaler.cpp.

double QwtPlotRescaler::aspectRatio (QwtAxisId axisId) const¶

Returns

Parameters

See also

Definition at line 243 of file qwt_plot_rescaler.cpp.

QWidget * QwtPlotRescaler::canvas ()¶

Returns

Definition at line 282 of file qwt_plot_rescaler.cpp.

const QWidget * QwtPlotRescaler::canvas () const¶

Returns

Definition at line 288 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::canvasResizeEvent (QResizeEvent * event) [protected], [virtual]¶

Event handler for resize events of the plot canvas

Parameters

See also

Definition at line 343 of file qwt_plot_rescaler.cpp.

QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (QwtAxisId axisId) const¶

Returns

Parameters

See also

Definition at line 197 of file qwt_plot_rescaler.cpp.

QwtInterval QwtPlotRescaler::expandInterval (const QwtInterval & interval, double width, ExpandingDirection direction) const [protected]¶

Expand the interval

Parameters

Returns

Definition at line 526 of file qwt_plot_rescaler.cpp.

QwtInterval QwtPlotRescaler::expandScale (QwtAxisId axisId, const QSize & oldSize, const QSize & newSize) const [protected], [virtual]¶

Calculate the new scale interval of a plot axis

Parameters

Returns

Definition at line 405 of file qwt_plot_rescaler.cpp.

QwtInterval QwtPlotRescaler::interval (QwtAxisId axisId) const [protected]¶

Parameters

Returns

Definition at line 509 of file qwt_plot_rescaler.cpp.

QwtInterval QwtPlotRescaler::intervalHint (QwtAxisId axisId) const¶

Parameters

Returns

See also

Definition at line 273 of file qwt_plot_rescaler.cpp.

bool QwtPlotRescaler::isEnabled () const¶

Returns

See also

Definition at line 118 of file qwt_plot_rescaler.cpp.

Qt::Orientation QwtPlotRescaler::orientation (QwtAxisId axisId) const [protected]¶

Returns

Parameters

Definition at line 500 of file qwt_plot_rescaler.cpp.

QwtPlot * QwtPlotRescaler::plot ()¶

Returns

Definition at line 294 of file qwt_plot_rescaler.cpp.

const QwtPlot * QwtPlotRescaler::plot () const¶

Returns

Definition at line 304 of file qwt_plot_rescaler.cpp.

QwtAxisId QwtPlotRescaler::referenceAxis () const¶

Returns

See also

Definition at line 158 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::rescale (const QSize & oldSize, const QSize & newSize) const [protected], [virtual]¶

Adjust the plot axes scales

Parameters

Definition at line 367 of file qwt_plot_rescaler.cpp.

QwtPlotRescaler::RescalePolicy QwtPlotRescaler::rescalePolicy () const¶

Returns

See also

Definition at line 138 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setAspectRatio (double ratio)¶

Set the aspect ratio between the scale of the reference axis and the other scales. The default ratio is 1.0

Parameters

See also

Definition at line 212 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setAspectRatio (QwtAxisId axisId, double ratio)¶

Set the aspect ratio between the scale of the reference axis and another scale. The default ratio is 1.0

Parameters

See also

Definition at line 226 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setEnabled (bool on)¶

En/disable the rescaler. When enabled is true an event filter is installed for the canvas, otherwise the event filter is removed.

Parameters

See also

Definition at line 97 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setExpandingDirection (ExpandingDirection direction)¶

Set the direction in which all axis should be expanded

Parameters

See also

Definition at line 169 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setExpandingDirection (QwtAxisId axisId, ExpandingDirection direction)¶

Set the direction in which an axis should be expanded

Parameters

See also

Definition at line 183 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setIntervalHint (QwtAxisId axisId, const QwtInterval & interval)¶

Set an interval hint for an axis

In Fitting mode, the hint is used as minimal interval that always needs to be displayed.

Parameters

See also

Definition at line 261 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setReferenceAxis (QwtAxisId axisId)¶

Set the reference axis ( see RescalePolicy )

Parameters

See also

Definition at line 149 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::setRescalePolicy (RescalePolicy policy)¶

Change the rescale policy

Parameters

See also

Definition at line 129 of file qwt_plot_rescaler.cpp.

QwtInterval QwtPlotRescaler::syncScale (QwtAxisId axisId, const QwtInterval & reference, const QSize & size) const [protected], [virtual]¶

Synchronize an axis scale according to the scale of the reference axis

Parameters

Returns

Definition at line 469 of file qwt_plot_rescaler.cpp.

void QwtPlotRescaler::updateScales (QwtInterval intervals[QwtAxis::AxisPositions]) const [protected], [virtual]¶

Update the axes scales

Parameters

Definition at line 588 of file qwt_plot_rescaler.cpp.