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QwtPlotRescaler(3)             Qwt User's Guide             QwtPlotRescaler(3)

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. o 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. o 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. o 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 Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.3 Tue Nov 20 2012 QwtPlotRescaler(3)

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