Provided by: libqwt5-doc_5.2.3-1_all 
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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