| QwtTransform(3) | Qwt User's Guide | QwtTransform(3) |
QwtTransform - A transformation between coordinate systems.
#include <qwt_transform.h>
Inherited by QwtLogTransform, QwtNullTransform, and QwtPowerTransform.
QwtTransform ()
Constructor. virtual ~QwtTransform ()
Destructor. virtual double bounded (double value) const
virtual double transform (double value) const =0
virtual double invTransform (double value) const =0
virtual QwtTransform * copy () const =0
Virtualized copy operation.
A transformation between coordinate systems.
QwtTransform manipulates values, when being mapped between the scale and the paint device coordinate system.
A transformation consists of 2 methods:
where one is is the inverse function of the other.
When p1, p2 are the boundaries of the paint device coordinates and s1, s2 the boundaries of the scale, QwtScaleMap uses the following calculations:
Modify value to be a valid value for the transformation. The default implementation does nothing.
Parameters:
Returns:
Reimplemented in QwtLogTransform.
Inverse transformation function
Parameters:
Returns:
See also:
Implemented in QwtPowerTransform, QwtLogTransform, and QwtNullTransform.
Transformation function
Parameters:
Returns:
See also:
Implemented in QwtPowerTransform, QwtLogTransform, and QwtNullTransform.
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| Wed Jan 2 2019 | Version 6.1.4 |