Public Types

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

Public Member Functions

QwtPlotRescaler (QwtPlotCanvas *, int referenceAxis=QwtPlot::xBottom, RescalePolicy=Expanding)
virtual ~QwtPlotRescaler ()
double aspectRatio (int axis) const
QwtPlotCanvas * canvas ()
const QwtPlotCanvas * canvas () const
virtual bool eventFilter (QObject *, QEvent *)
ExpandingDirection expandingDirection (int axis) const
QwtDoubleInterval intervalHint (int axis) const
bool isEnabled () const
QwtPlot * plot ()
const QwtPlot * plot () const
int referenceAxis () const
void rescale () const
RescalePolicy rescalePolicy () const
void setAspectRatio (double ratio)
void setAspectRatio (int axis, double ratio)
void setEnabled (bool)
void setExpandingDirection (ExpandingDirection)
void setExpandingDirection (int axis, ExpandingDirection)
void setIntervalHint (int axis, const QwtDoubleInterval &)
void setReferenceAxis (int axis)
void setRescalePolicy (RescalePolicy)

Protected Member Functions

virtual void canvasResizeEvent (QResizeEvent *)
QwtDoubleInterval expandInterval (const QwtDoubleInterval &, double width, ExpandingDirection) const
virtual QwtDoubleInterval expandScale (int axis, const QSize &oldSize, const QSize &newSize) const
QwtDoubleInterval interval (int axis) const
Qt::Orientation orientation (int axis) const
virtual void rescale (const QSize &oldSize, const QSize &newSize) const
virtual QwtDoubleInterval syncScale (int axis, const QwtDoubleInterval &reference, const QSize &size) const
virtual void updateScales (QwtDoubleInterval intervals[QwtPlot::axisCnt]) const

enum QwtPlotRescaler::RescalePolicy

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

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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.

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Expanding

The interval of the reference axis will be shrinked/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 minimal interval.

QwtPlotRescaler::QwtPlotRescaler (QwtPlotCanvas *canvas, intreferenceAxis = QwtPlot::xBottom, RescalePolicypolicy = Expanding) [explicit]

Constructor

Parameters:

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double QwtPlotRescaler::aspectRatio (intaxis) const

Return aspect ratio between an axis and the reference axis.

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QwtPlotCanvas * QwtPlotRescaler::canvas ()

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const QwtPlotCanvas * QwtPlotRescaler::canvas () const

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QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (intaxis) const

Return direction in which an axis should be expanded

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QwtDoubleInterval QwtPlotRescaler::expandInterval (const QwtDoubleInterval &interval, doublewidth, ExpandingDirectiondirection) const [protected]

Expand the interval

Parameters:

Returns:

QwtDoubleInterval QwtPlotRescaler::expandScale (intaxis, const QSize &oldSize, const QSize &newSize) const [protected], [virtual]

Calculate the new scale interval of a plot axis

Parameters:

Returns:

QwtDoubleInterval QwtPlotRescaler::interval (intaxis) const [protected]

Return interval of an axis

Parameters:

bool QwtPlotRescaler::isEnabled () const

Returns:

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Qt::Orientation QwtPlotRescaler::orientation (intaxis) const [protected]

Return orientation of an axis

Parameters:

QwtPlot * QwtPlotRescaler::plot ()

Returns:

const QwtPlot * QwtPlotRescaler::plot () const

Returns:

int QwtPlotRescaler::referenceAxis () const

Returns:

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

Adjust the plot axes scales

Parameters:

QwtPlotRescaler::RescalePolicy QwtPlotRescaler::rescalePolicy () const

Returns:

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void QwtPlotRescaler::setAspectRatio (doubleratio)

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

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void QwtPlotRescaler::setAspectRatio (intaxis, doubleratio)

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

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void QwtPlotRescaler::setEnabled (boolon)

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

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void QwtPlotRescaler::setExpandingDirection (ExpandingDirectiondirection)

Set the direction in which all axis should be expanded

Parameters:

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void QwtPlotRescaler::setExpandingDirection (intaxis, ExpandingDirectiondirection)

Set the direction in which an axis should be expanded

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void QwtPlotRescaler::setReferenceAxis (intaxis)

Set the reference axis ( see RescalePolicy )

Parameters:

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void QwtPlotRescaler::setRescalePolicy (RescalePolicypolicy)

Change the rescale policy

Parameters:

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QwtDoubleInterval QwtPlotRescaler::syncScale (intaxis, const QwtDoubleInterval &reference, const QSize &size) const [protected], [virtual]

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

Parameters:

void QwtPlotRescaler::updateScales (QwtDoubleIntervalintervals[QwtPlot::axisCnt]) const [protected], [virtual]

Update the axes scales

Parameters: