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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:
           canvas Canvas
           referenceAxis Reference axis, see RescalePolicy
           policy Rescale policy

       See also:
           setRescalePolicy(), setReferenceAxis()

Member Function Documentation

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

       Parameters:
           axis Axis index ( see QwtPlot::AxisId )

       See also:
           setAspectRatio()

   QwtPlotCanvas * QwtPlotRescaler::canvas ()
       Returns:
           plot canvas

   const QwtPlotCanvas * QwtPlotRescaler::canvas () const
       Returns:
           plot canvas

   QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (intaxis) const
       Return 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 () const
       Returns:
           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 () const
       Returns:
           plot widget

   int QwtPlotRescaler::referenceAxis () const
       Returns:
           Reference axis ( see RescalePolicy )

       See also:
           setReferenceAxis()

   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 () const
       Returns:
           Rescale policy

       See also:
           setRescalePolicy()

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

       Parameters:
           direction Direction

       See also:
           expandingDirection()

   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::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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