QwtPlotRescaler(3) Qwt User's Guide QwtPlotRescaler(3) NAME QwtPlotRescaler - QwtPlotRescaler takes care of fixed aspect ratios for plot scales. SYNOPSIS #include Inherits QObject. Public Types enum RescalePolicy { Fixed, Expanding, Fitting } enum ExpandingDirection { ExpandUp, ExpandDown, ExpandBoth } Public Member Functions QwtPlotRescaler (QWidget *canvas, QwtAxisId referenceAxis=QwtAxis::XBottom, RescalePolicy=Expanding) virtual ~QwtPlotRescaler () Destructor. void setEnabled (bool) En/disable the rescaler. bool isEnabled () const void setRescalePolicy (RescalePolicy) RescalePolicy rescalePolicy () const void setExpandingDirection (ExpandingDirection) void setExpandingDirection (QwtAxisId, ExpandingDirection) ExpandingDirection expandingDirection (QwtAxisId) const void setReferenceAxis (QwtAxisId) QwtAxisId referenceAxis () const void setAspectRatio (double ratio) void setAspectRatio (QwtAxisId, double ratio) double aspectRatio (QwtAxisId) const void setIntervalHint (QwtAxisId, const QwtInterval &) QwtInterval intervalHint (QwtAxisId) const QWidget * canvas () const QWidget * canvas () const QwtPlot * plot () const QwtPlot * plot () const virtual bool eventFilter (QObject *, QEvent *) override Event filter for the plot canvas. void rescale () const Adjust the plot axes scales. Protected Member Functions virtual void canvasResizeEvent (QResizeEvent *) virtual void rescale (const QSize &oldSize, const QSize &newSize) const virtual QwtInterval expandScale (QwtAxisId, const QSize &oldSize, const QSize &newSize) const virtual QwtInterval syncScale (QwtAxisId, const QwtInterval &reference, const QSize &size) const virtual void updateScales (QwtInterval intervals[QwtAxis::AxisPositions]) const Qt::Orientation orientation (QwtAxisId) const QwtInterval interval (QwtAxisId) const QwtInterval expandInterval (const QwtInterval &, double width, ExpandingDirection) const Detailed Description QwtPlotRescaler takes care of fixed aspect ratios for plot scales. QwtPlotRescaler auto adjusts the axes of a QwtPlot according to fixed aspect ratios. Definition at line 29 of file qwt_plot_rescaler.h. Member Enumeration Documentation enum QwtPlotRescaler::ExpandingDirection When rescalePolicy() is set to Expanding its direction depends on ExpandingDirection Enumerator ExpandUp The upper limit of the scale is adjusted. ExpandDown The lower limit of the scale is adjusted. ExpandBoth Both limits of the scale are adjusted. Definition at line 70 of file qwt_plot_rescaler.h. enum QwtPlotRescaler::RescalePolicy The rescale policy defines how to rescale the reference axis and their depending axes. See also ExpandingDirection, setIntervalHint() Enumerator 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 shrunk/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 interval hint. Definition at line 40 of file qwt_plot_rescaler.h. Constructor & Destructor Documentation QwtPlotRescaler::QwtPlotRescaler (QWidget * canvas, QwtAxisId referenceAxis = QwtAxis::XBottom, RescalePolicy policy = Expanding) [explicit] Constructor Parameters canvas Canvas referenceAxis Reference axis, see RescalePolicy policy Rescale policy See also setRescalePolicy(), setReferenceAxis() Definition at line 71 of file qwt_plot_rescaler.cpp. Member Function Documentation double QwtPlotRescaler::aspectRatio (QwtAxisId axisId) const Returns Aspect ratio between an axis and the reference axis. Parameters axisId Axis See also setAspectRatio() Definition at line 243 of file qwt_plot_rescaler.cpp. QWidget * QwtPlotRescaler::canvas () Returns plot canvas Definition at line 282 of file qwt_plot_rescaler.cpp. const QWidget * QwtPlotRescaler::canvas () const Returns plot canvas Definition at line 288 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::canvasResizeEvent (QResizeEvent * event) [protected], [virtual] Event handler for resize events of the plot canvas Parameters event Resize event See also rescale() Definition at line 343 of file qwt_plot_rescaler.cpp. QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (QwtAxisId axisId) const Returns Direction in which an axis should be expanded Parameters axisId Axis See also setExpandingDirection() Definition at line 197 of file qwt_plot_rescaler.cpp. QwtInterval QwtPlotRescaler::expandInterval (const QwtInterval & interval, double width, ExpandingDirection direction) 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 Definition at line 526 of file qwt_plot_rescaler.cpp. QwtInterval QwtPlotRescaler::expandScale (QwtAxisId axisId, const QSize & oldSize, const QSize & newSize) const [protected], [virtual] Calculate the new scale interval of a plot axis Parameters axisId Axis oldSize Previous size of the canvas newSize New size of the canvas Returns Calculated new interval for the axis Definition at line 405 of file qwt_plot_rescaler.cpp. QwtInterval QwtPlotRescaler::interval (QwtAxisId axisId) const [protected] Parameters axisId Axis Returns Normalized interval of an axis Definition at line 509 of file qwt_plot_rescaler.cpp. QwtInterval QwtPlotRescaler::intervalHint (QwtAxisId axisId) const Parameters axisId Axis Returns Interval hint See also setIntervalHint(), RescalePolicy Definition at line 273 of file qwt_plot_rescaler.cpp. bool QwtPlotRescaler::isEnabled () const Returns true when enabled, false otherwise See also setEnabled, eventFilter() Definition at line 118 of file qwt_plot_rescaler.cpp. Qt::Orientation QwtPlotRescaler::orientation (QwtAxisId axisId) const [protected] Returns Orientation of an axis Parameters axisId Axis Definition at line 500 of file qwt_plot_rescaler.cpp. QwtPlot * QwtPlotRescaler::plot () Returns plot widget Definition at line 294 of file qwt_plot_rescaler.cpp. const QwtPlot * QwtPlotRescaler::plot () const Returns plot widget Definition at line 304 of file qwt_plot_rescaler.cpp. QwtAxisId QwtPlotRescaler::referenceAxis () const Returns Reference axis ( see RescalePolicy ) See also setReferenceAxis() Definition at line 158 of file qwt_plot_rescaler.cpp. 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 Definition at line 367 of file qwt_plot_rescaler.cpp. QwtPlotRescaler::RescalePolicy QwtPlotRescaler::rescalePolicy () const Returns Rescale policy See also setRescalePolicy() Definition at line 138 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setAspectRatio (double ratio) 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() Definition at line 212 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setAspectRatio (QwtAxisId axisId, double ratio) Set the aspect ratio between the scale of the reference axis and another scale. The default ratio is 1.0 Parameters axisId Axis ratio Aspect ratio See also aspectRatio() Definition at line 226 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setEnabled (bool on) 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() Definition at line 97 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setExpandingDirection (ExpandingDirection direction) Set the direction in which all axis should be expanded Parameters direction Direction See also expandingDirection() Definition at line 169 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setExpandingDirection (QwtAxisId axisId, ExpandingDirection direction) Set the direction in which an axis should be expanded Parameters axisId Axis direction Direction See also expandingDirection() Definition at line 183 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setIntervalHint (QwtAxisId axisId, const QwtInterval & interval) Set an interval hint for an axis In Fitting mode, the hint is used as minimal interval that always needs to be displayed. Parameters axisId Axis interval Axis See also intervalHint(), RescalePolicy Definition at line 261 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setReferenceAxis (QwtAxisId axisId) Set the reference axis ( see RescalePolicy ) Parameters axisId Axis See also referenceAxis() Definition at line 149 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::setRescalePolicy (RescalePolicy policy) Change the rescale policy Parameters policy Rescale policy See also rescalePolicy() Definition at line 129 of file qwt_plot_rescaler.cpp. QwtInterval QwtPlotRescaler::syncScale (QwtAxisId axisId, const QwtInterval & reference, const QSize & size) const [protected], [virtual] Synchronize an axis scale according to the scale of the reference axis Parameters axisId Axis reference Interval of the reference axis size Size of the canvas Returns New interval for axis Definition at line 469 of file qwt_plot_rescaler.cpp. void QwtPlotRescaler::updateScales (QwtInterval intervals[QwtAxis::AxisPositions]) const [protected], [virtual] Update the axes scales Parameters intervals Scale intervals Definition at line 588 of file qwt_plot_rescaler.cpp. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.2.0 Sun Jul 18 2021 QwtPlotRescaler(3)