NAME¶

QwtPlotRescaler -

SYNOPSIS¶

#include <qwt_plot_rescaler.h>

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

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: See also:

Member Function Documentation¶

double QwtPlotRescaler::aspectRatio (intaxis) const¶

Return aspect ratio between an axis and the reference axis. Parameters: See also:

QwtPlotCanvas * QwtPlotRescaler::canvas ()¶

Returns:

const QwtPlotCanvas * QwtPlotRescaler::canvas () const¶

Returns:

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

Return direction in which an axis should be expanded Parameters: See also:

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: See also:

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: 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 (doubleratio)¶

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 (intaxis, doubleratio)¶

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 (boolon)¶

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 (ExpandingDirectiondirection)¶

Set the direction in which all axis should be expanded Parameters: See also:

void QwtPlotRescaler::setExpandingDirection (intaxis, ExpandingDirectiondirection)¶

Set the direction in which an axis should be expanded Parameters: See also:

void QwtPlotRescaler::setReferenceAxis (intaxis)¶

Set the reference axis ( see RescalePolicy ) Parameters: See also:

void QwtPlotRescaler::setRescalePolicy ( RescalePolicypolicy)¶

Change the rescale policy Parameters: See also:

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:

Author¶

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