conflicting packages
QwtDoubleRange(3) | Qwt User's Guide | QwtDoubleRange(3) |
NAME¶
QwtDoubleRange -SYNOPSIS¶
#include <qwt_double_range.h> Inherited by QwtAbstractSlider, and QwtCounter.Public Member Functions¶
QwtDoubleRange ()
Protected Member Functions¶
double exactPrevValue () const
Detailed Description¶
A class which controls a value within an interval. This class is useful as a base class or a member for sliders. It represents an interval of type double within which a value can be moved. The value can be either an arbitrary point inside the interval (see QwtDoubleRange::setValue), or it can be fitted into a step raster (see QwtDoubleRange::fitValue and QwtDoubleRange::incValue). As a special case, a QwtDoubleRange can be periodic, which means that a value outside the interval will be mapped to a value inside the interval when QwtDoubleRange::setValue(), QwtDoubleRange::fitValue(), QwtDoubleRange::incValue() or QwtDoubleRange::incPages() are called.Constructor & Destructor Documentation¶
QwtDoubleRange::QwtDoubleRange ()¶
The range is initialized to [0.0, 100.0], the step size to 1.0, and the value to 0.0.Member Function Documentation¶
double QwtDoubleRange::exactValue () const [protected]¶
Returns the exact value. The exact value is the value which QwtDoubleRange::value would return if the value were not adjusted to the step raster. It differs from the current value only if QwtDoubleRange::fitValue or QwtDoubleRange::incValue have been used before. This function is intended for internal use in derived classes.void QwtDoubleRange::fitValue (doublex) [virtual]¶
Adjust the value to the closest point in the step raster. Parameters:x value
Warning:
The value is clipped when it lies outside the range. When
the range is QwtDoubleRange::periodic, it will be mapped to a point in
the interval such that
with an integer number n.
Reimplemented in QwtAbstractSlider.
new value := x + n * (max. value - min. value)
with an integer number n.
void QwtDoubleRange::incPages (intnPages) [virtual]¶
Increment the value by a specified number of pages. Parameters:nPages Number of pages to increment. A negative
number decrements the value.
Warning:
The Page size is specified in the constructor.
void QwtDoubleRange::incValue (intnSteps) [virtual]¶
Increment the value by a specified number of steps. Parameters:nSteps Number of steps to increment
Warning:
As a result of this operation, the new value will always
be adjusted to the step raster.
Reimplemented in QwtAbstractSlider.
double QwtDoubleRange::maxValue () const¶
Returns the value of the second border of the range. maxValue returns the value which has been specified as the second parameter in QwtDoubleRange::setRange. See also:setRange()
double QwtDoubleRange::minValue () const¶
Returns the value at the first border of the range. minValue returns the value which has been specified as the first parameter in setRange(). See also:setRange()
bool QwtDoubleRange::periodic () const¶
Returns true if the range is periodic. See also:setPeriodic()
void QwtDoubleRange::rangeChange () [protected], [virtual]¶
Notify a change of the range. This virtual function is called whenever the range changes. The default implementation does nothing. Reimplemented in QwtDial, QwtCounter, and QwtSlider.void QwtDoubleRange::setPeriodic (booltf)¶
Make the range periodic. When the range is periodic, the value will be set to a point inside the interval such thatpoint = value + n * width .fi
if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.
Parameters:
tf true for a periodic range
void QwtDoubleRange::setRange (doublevmin, doublevmax, doublevstep = 0.0, intpageSize = 1)¶
Specify range and step size. Parameters:vmin lower boundary of the interval
vmax higher boundary of the interval
vstep step width
pageSize page size in steps
Warning:
- •
- A change of the range changes the value if it lies outside the new range. The current value will not be adjusted to the new step raster.
- •
- vmax < vmin is allowed.
- •
- If the step size is left out or set to zero, it will be set to 1/100 of the interval length.
- •
- If the step size has an absurd value, it will be corrected to a better one.
void QwtDoubleRange::setStep (doublevstep)¶
Change the step raster. Parameters:vstep new step width
Warning:
The value will not be adjusted to the new step
raster.
Reimplemented in QwtCounter.
void QwtDoubleRange::setValue (doublex) [virtual]¶
Set a new value without adjusting to the step raster. Parameters:x new value
Warning:
The value is clipped when it lies outside the range. When
the range is QwtDoubleRange::periodic, it will be mapped to a point in
the interval such that
with an integer number n.
Reimplemented in QwtCounter, and QwtAbstractSlider.
new value := x + n * (max. value - min. value)
with an integer number n.
double QwtDoubleRange::step () const¶
Returns:the step size
See also:
setStep(), setRange()
Reimplemented in QwtCounter.
void QwtDoubleRange::stepChange () [protected], [virtual]¶
Notify a change of the step size. This virtual function is called whenever the step size changes. The default implementation does nothing.void QwtDoubleRange::valueChange () [protected], [virtual]¶
Notify a change of value. This virtual function is called whenever the value changes. The default implementation does nothing. Reimplemented in QwtDial, QwtAbstractSlider, QwtSlider, and QwtWheel.Author¶
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