Provided by: libqwt-doc_6.1.4-2_all 
NAME
QwtPlotRescaler - QwtPlotRescaler takes care of fixed aspect ratios for plot scales.
SYNOPSIS
#include <qwt_plot_rescaler.h>
Inherits QObject.
Public Types
enum RescalePolicy { Fixed, Expanding, Fitting }
enum ExpandingDirection { ExpandUp, ExpandDown, ExpandBoth }
Public Member Functions
QwtPlotRescaler (QWidget *canvas, int referenceAxis=QwtPlot::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 (int axis, ExpandingDirection)
ExpandingDirection expandingDirection (int axis) const
void setReferenceAxis (int axis)
int referenceAxis () const
void setAspectRatio (double ratio)
void setAspectRatio (int axis, double ratio)
double aspectRatio (int axis) const
void setIntervalHint (int axis, const QwtInterval &)
QwtInterval intervalHint (int axis) const
QWidget * canvas ()
const QWidget * canvas () const
QwtPlot * plot ()
const QwtPlot * plot () const
virtual bool eventFilter (QObject *, QEvent *)
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 (int axis, const QSize &oldSize, const QSize &newSize)
const
virtual QwtInterval syncScale (int axis, const QwtInterval &reference, const QSize &size)
const
virtual void updateScales (QwtInterval intervals[QwtPlot::axisCnt]) const
Qt::Orientation orientation (int axis) const
QwtInterval interval (int axis) 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.
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.
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.
Constructor & Destructor Documentation
QwtPlotRescaler::QwtPlotRescaler (QWidget * canvas, int referenceAxis = QwtPlot::xBottom,
RescalePolicy policy = Expanding) [explicit]
Constructor
Parameters:
canvas Canvas
referenceAxis Reference axis, see RescalePolicy
policy Rescale policy
See also:
setRescalePolicy(), setReferenceAxis()
Member Function Documentation
double QwtPlotRescaler::aspectRatio (int axis) const
Returns:
Aspect ratio between an axis and the reference axis.
Parameters:
axis Axis index ( see QwtPlot::AxisId )
See also:
setAspectRatio()
QWidget * QwtPlotRescaler::canvas ()
Returns:
plot canvas
const QWidget * QwtPlotRescaler::canvas () const
Returns:
plot canvas
void QwtPlotRescaler::canvasResizeEvent (QResizeEvent * event) [protected], [virtual]
Event handler for resize events of the plot canvas
Parameters:
event Resize event
See also:
rescale()
QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection (int axis) const
Returns:
Direction in which an axis should be expanded
Parameters:
axis Axis index ( see QwtPlot::AxisId )
See also:
setExpandingDirection()
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
QwtInterval QwtPlotRescaler::expandScale (int axis, 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
QwtInterval QwtPlotRescaler::interval (int axis) const [protected]
Parameters:
axis Axis index ( see QwtPlot::AxisId )
Returns:
Normalized interval of an axis
QwtInterval QwtPlotRescaler::intervalHint (int axis) const
Parameters:
axis Axis, see QwtPlot::Axis
Returns:
Interval hint
See also:
setIntervalHint(), RescalePolicy
bool QwtPlotRescaler::isEnabled () const
Returns:
true when enabled, false otherwise
See also:
setEnabled, eventFilter()
Qt::Orientation QwtPlotRescaler::orientation (int axis) const [protected]
Returns:
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 (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()
void QwtPlotRescaler::setAspectRatio (int axis, double ratio)
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 (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()
void QwtPlotRescaler::setExpandingDirection (ExpandingDirection direction)
Set the direction in which all axis should be expanded
Parameters:
direction Direction
See also:
expandingDirection()
void QwtPlotRescaler::setExpandingDirection (int axis, ExpandingDirection direction)
Set the direction in which an axis should be expanded
Parameters:
axis Axis index ( see QwtPlot::AxisId )
direction Direction
See also:
expandingDirection()
void QwtPlotRescaler::setIntervalHint (int axis, 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:
axis Axis, see QwtPlot::Axis
interval Axis
See also:
intervalHint(), RescalePolicy
void QwtPlotRescaler::setReferenceAxis (int axis)
Set the reference axis ( see RescalePolicy )
Parameters:
axis Axis index ( QwtPlot::Axis )
See also:
referenceAxis()
void QwtPlotRescaler::setRescalePolicy (RescalePolicy policy)
Change the rescale policy
Parameters:
policy Rescale policy
See also:
rescalePolicy()
QwtInterval QwtPlotRescaler::syncScale (int axis, const QwtInterval & 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
Returns:
New interval for axis
void QwtPlotRescaler::updateScales (QwtInterval intervals[QwtPlot::axisCnt]) const
[protected], [virtual]
Update the axes scales
Parameters:
intervals Scale intervals
Author
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