QwtPlotRescaler(3) QwtPlotRescaler takes care of fixed aspect ratios for plot scales.

SYNOPSIS


#include <qwt_plot_rescaler.h>

Public Types


enum ExpandingDirection { ExpandUp, ExpandDown, ExpandBoth }

enum RescalePolicy { Fixed, Expanding, Fitting }

Public Member Functions


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

QwtPlotRescaler (QwtPlotCanvas *, int referenceAxis=QwtPlot::xBottom, RescalePolicy=Expanding)

int referenceAxis () const

void rescale () const

RescalePolicy rescalePolicy () const

void setAspectRatio (int axis, double ratio)

void setAspectRatio (double ratio)

void setEnabled (bool)

void setExpandingDirection (int axis, ExpandingDirection)

void setExpandingDirection (ExpandingDirection)

void setIntervalHint (int axis, const QwtDoubleInterval &)

void setReferenceAxis (int axis)

void setRescalePolicy (RescalePolicy)

virtual ~QwtPlotRescaler ()

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

Detailed Description

QwtPlotRescaler takes care of fixed aspect ratios for plot scales.

QwtPlotRescaler autoadjusts the axes of a QwtPlot according to fixed aspect ratios.

Member Enumeration Documentation

enum QwtPlotRescaler::RescalePolicy

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

  • 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 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.

Constructor & Destructor Documentation

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

Parameters:

canvas Canvas
referenceAxis Reference axis, see RescalePolicy
policy Rescale policy

See also:

setRescalePolicy(), setReferenceAxis()

QwtPlotRescaler::~QwtPlotRescaler () [virtual]

Destructor.

Member Function Documentation

double QwtPlotRescaler::aspectRatio (intaxis) constReturn aspect ratio between an axis and the reference axis.

Parameters:

axis Axis index ( see QwtPlot::AxisId )

See also:

setAspectRatio()

const QwtPlotCanvas * QwtPlotRescaler::canvas () constReturns:

plot canvas

QwtPlotCanvas * QwtPlotRescaler::canvas ()Returns:

plot canvas

bool QwtPlotRescaler::eventFilter (QObject *o, QEvent *e) [virtual]

Event filter for the plot canvas.

QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (intaxis) constReturn direction in which an axis should be expanded

Parameters:

axis Axis index ( see QwtPlot::AxisId )

See also:

setExpandingDirection()

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

Parameters:

interval Interval to be expanded
width Distance to be added to the interval
direction Direction of the expand operation

Returns:

Expanded interval

QwtDoubleInterval QwtPlotRescaler::expandScale (intaxis, const QSize &oldSize, const QSize &newSize) const [protected, virtual]Calculate the new scale interval of a plot axis

Parameters:

axis Axis index ( see QwtPlot::AxisId )
oldSize Previous size of the canvas
newSize New size of the canvas

Returns:

Calculated new interval for the axis

QwtDoubleInterval QwtPlotRescaler::interval (intaxis) const [protected]Return interval of an axis

Parameters:

axis Axis index ( see QwtPlot::AxisId )

bool QwtPlotRescaler::isEnabled () constReturns:

true when enabled, false otherwise

See also:

setEnabled, eventFilter()

Qt::Orientation QwtPlotRescaler::orientation (intaxis) const [protected]Return orientation of an axis

Parameters:

axis Axis index ( see QwtPlot::AxisId )

QwtPlot * QwtPlotRescaler::plot ()Returns:

plot widget

const QwtPlot * QwtPlotRescaler::plot () constReturns:

plot widget

int QwtPlotRescaler::referenceAxis () constReturns:

Reference axis ( see RescalePolicy )

See also:

setReferenceAxis()

void QwtPlotRescaler::rescale () const

Adjust the plot axes scales.

void QwtPlotRescaler::rescale (const QSize &oldSize, const QSize &newSize) const [protected, virtual]Adjust the plot axes scales

Parameters:

oldSize Previous size of the canvas
newSize New size of the canvas

QwtPlotRescaler::RescalePolicy QwtPlotRescaler::rescalePolicy () constReturns:

Rescale policy

See also:

setRescalePolicy()

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

Parameters:

axis Axis index ( see QwtPlot::AxisId )
ratio Aspect ratio

See also:

aspectRatio()

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

Parameters:

ratio Aspect ratio

See also:

aspectRatio()

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.

Parameters:

on true or false

See also:

isEnabled(), eventFilter()

void QwtPlotRescaler::setExpandingDirection (intaxis, ExpandingDirectiondirection)Set the direction in which an axis should be expanded

Parameters:

axis Axis index ( see QwtPlot::AxisId )
direction Direction

See also:

expandingDirection()

void QwtPlotRescaler::setExpandingDirection (ExpandingDirectiondirection)Set the direction in which all axis should be expanded

Parameters:

direction Direction

See also:

expandingDirection()

void QwtPlotRescaler::setReferenceAxis (intaxis)Set the reference axis ( see RescalePolicy )

Parameters:

axis Axis index ( QwtPlot::Axis )

See also:

referenceAxis()

void QwtPlotRescaler::setRescalePolicy (RescalePolicypolicy)Change the rescale policy

Parameters:

policy Rescale policy

See also:

rescalePolicy()

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:

axis Axis index ( see QwtPlot::AxisId )
reference Interval of the reference axis
size Size of the canvas

void QwtPlotRescaler::updateScales (QwtDoubleIntervalintervals[QwtPlot::axisCnt]) const [protected, virtual]Update the axes scales

Parameters:

intervals Scale intervals

Author

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