NAME

       QwtScaleMap -

SYNOPSIS

       #include <qwt_scale_map.h>

   Public Member Functions
       QwtScaleMap ()
       QwtScaleMap (const QwtScaleMap &)
       ~QwtScaleMap ()
       double invTransform (double i) const
       QwtScaleMap & operator= (const QwtScaleMap &)
       double p1 () const
       double p2 () const
       double pDist () const
       double s1 () const
       double s2 () const
       double sDist () const
       void setPaintInterval (int p1, int p2)
       void setPaintXInterval (double p1, double p2)
       void setScaleInterval (double s1, double s2)
       void setTransformation (QwtScaleTransformation *)
       int transform (double x) const
       const QwtScaleTransformation * transformation () const
       double xTransform (double x) const

   Public Attributes
       QT_STATIC_CONST double LogMax = 1.0e150
       QT_STATIC_CONST double LogMin = 1.0e-150

Detailed Description

       A scale map.

       QwtScaleMap offers transformations from a scale into a paint interval and vice versa.

Constructor & Destructor Documentation

   QwtScaleMap::QwtScaleMap ()
       Constructor. The scale and paint device intervals are both set to [0,1].

   QwtScaleMap::~QwtScaleMap ()
       Destructor

Member Function Documentation

   double QwtScaleMap::invTransform (doublep) const [inline]
       Transform an paint device value into a value in the interval of the scale.

       Parameters:
           p Value relative to the coordinates of the paint device

       See also:
           transform()

   double QwtScaleMap::p1 () const [inline]
       Returns:
           First border of the paint interval

   double QwtScaleMap::p2 () const [inline]
       Returns:
           Second border of the paint interval

   double QwtScaleMap::pDist () const [inline]
       Returns:
           qwtAbs(p2() - p1())

   double QwtScaleMap::s1 () const [inline]
       Returns:
           First border of the scale interval

   double QwtScaleMap::s2 () const [inline]
       Returns:
           Second border of the scale interval

   double QwtScaleMap::sDist () const [inline]
       Returns:
           qwtAbs(s2() - s1())

   void QwtScaleMap::setPaintInterval (intp1, intp2)
       Specify the borders of the paint device interval. Parameters:
           p1 first border
           p2 second border

   void QwtScaleMap::setPaintXInterval (doublep1, doublep2)
       Specify the borders of the paint device interval. Parameters:
           p1 first border
           p2 second border

   void QwtScaleMap::setScaleInterval (doubles1, doubles2)
       Specify the borders of the scale interval. Parameters:
           s1 first border
           s2 second border

       Warning:
           logarithmic scales might be aligned to [LogMin, LogMax]

   void QwtScaleMap::setTransformation (QwtScaleTransformation *transformation)
       Initialize the map with a transformation

   int QwtScaleMap::transform (doubles) const [inline]
       Transform a point related to the scale interval into an point related to the interval of
       the paint device and round it to an integer. (In Qt <= 3.x paint devices are integer
       based. )

       Parameters:
           s Value relative to the coordinates of the scale

       See also:
           xTransform()

   double QwtScaleMap::xTransform (doubles) const [inline]
       Transform a point related to the scale interval into an point related to the interval of
       the paint device

       Parameters:
           s Value relative to the coordinates of the scale

Author

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