Public Types¶

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

Public Member Functions¶

QwtPlotRescaler (QWidget *canvas, int referenceAxis=QwtPlot::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 (int axis, ExpandingDirection)
ExpandingDirection expandingDirection (int axis) const
void setReferenceAxis (int axis)
int referenceAxis () const
void setAspectRatio (double ratio)
void setAspectRatio (int axis, double ratio)
double aspectRatio (int axis) const
void setIntervalHint (int axis, const QwtInterval &)
QwtInterval intervalHint (int axis) const
QWidget * canvas ()
const QWidget * canvas () const
QwtPlot * plot ()
const QwtPlot * plot () const
virtual bool eventFilter (QObject *, QEvent *)
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 (int axis, const QSize &oldSize, const QSize &newSize) const
virtual QwtInterval syncScale (int axis, const QwtInterval &reference, const QSize &size) const
virtual void updateScales (QwtInterval intervals[QwtPlot::axisCnt]) const
Qt::Orientation orientation (int axis) const
QwtInterval interval (int axis) 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.

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.

QwtPlotRescaler::QwtPlotRescaler (QWidget * canvas, int referenceAxis = QwtPlot::xBottom, RescalePolicy policy = Expanding) [explicit]¶

Constructor

Parameters:

See also:

double QwtPlotRescaler::aspectRatio (int axis) const¶

Returns:

Parameters:

See also:

QWidget * QwtPlotRescaler::canvas ()¶

Returns:

const QWidget * QwtPlotRescaler::canvas () const¶

Returns:

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

Event handler for resize events of the plot canvas

Parameters:

See also:

QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (int axis) const¶

Returns:

Parameters:

See also:

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

Expand the interval

Parameters:

Returns:

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

Calculate the new scale interval of a plot axis

Parameters:

Returns:

QwtInterval QwtPlotRescaler::interval (int axis) const [protected]¶

Parameters:

Returns:

QwtInterval QwtPlotRescaler::intervalHint (int axis) const¶

Parameters:

Returns:

See also:

bool QwtPlotRescaler::isEnabled () const¶

Returns:

See also:

Qt::Orientation QwtPlotRescaler::orientation (int axis) const [protected]¶

Returns:

Parameters:

QwtPlot * QwtPlotRescaler::plot ()¶

Returns:

const QwtPlot * QwtPlotRescaler::plot () const¶

Returns:

int QwtPlotRescaler::referenceAxis () const¶

Returns:

See also:

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

Adjust the plot axes scales

Parameters:

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

Returns:

See also:

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:

void QwtPlotRescaler::setAspectRatio (int axis, 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:

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:

void QwtPlotRescaler::setExpandingDirection (ExpandingDirection direction)¶

Set the direction in which all axis should be expanded

Parameters:

See also:

void QwtPlotRescaler::setExpandingDirection (int axis, ExpandingDirection direction)¶

Set the direction in which an axis should be expanded

Parameters:

See also:

void QwtPlotRescaler::setIntervalHint (int axis, 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:

void QwtPlotRescaler::setReferenceAxis (int axis)¶

Set the reference axis ( see RescalePolicy )

Parameters:

See also:

void QwtPlotRescaler::setRescalePolicy (RescalePolicy policy)¶

Change the rescale policy

Parameters:

See also:

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

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

Parameters:

Returns:

void QwtPlotRescaler::updateScales (QwtInterval intervals[QwtPlot::axisCnt]) const [protected], [virtual]¶

Update the axes scales

Parameters: