NAME

       QwtScaleMap - A scale map.

SYNOPSIS

       #include <qwt_scale_map.h>

   Public Member Functions
       QwtScaleMap ()
           Constructor.
       QwtScaleMap (const QwtScaleMap &)
           Copy constructor.
       ~QwtScaleMap ()
       QwtScaleMap & operator= (const QwtScaleMap &)
           Assignment operator.
       void setTransformation (QwtTransform *)
       const QwtTransform * transformation () const
           Get the transformation.
       void setPaintInterval (double p1, double p2)
           Specify the borders of the paint device interval.
       void setScaleInterval (double s1, double s2)
           Specify the borders of the scale interval.
       double transform (double s) const
       double invTransform (double p) const
       double p1 () const
       double p2 () const
       double s1 () const
       double s2 () const
       double pDist () const
       double sDist () const
       bool isInverting () const

   Static Public Member Functions
       static QRectF transform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
       static QRectF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
       static QPointF transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
       static QPointF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)

Detailed Description

       A scale map.

       QwtScaleMap offers transformations from the coordinate system of a scale into the linear
       coordinate system of a paint device 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 (double p) 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

       Returns:
           Transformed value

       See also:
           transform()

   QRectF QwtScaleMap::invTransform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QRectF & rect) [static]
       Transform a rectangle from paint to scale coordinates

       Parameters:
           xMap X map
           yMap Y map
           rect Rectangle in paint coordinates

       Returns:
           Rectangle in scale coordinates

       See also:
           transform()

   QPointF QwtScaleMap::invTransform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QPointF & pos) [static]
       Transform a rectangle from paint to scale coordinates

       Parameters:
           xMap X map
           yMap Y map
           pos Position in paint coordinates

       Returns:
           Position in scale coordinates

       See also:
           transform()

   bool QwtScaleMap::isInverting () const [inline]
       Returns:
           True, when ( p1() < p2() ) != ( s1() < s2() )

   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 (double p1, double p2)
       Specify the borders of the paint device interval.

       Parameters:
           p1 first border
           p2 second border

   void QwtScaleMap::setScaleInterval (double s1, double s2)
       Specify the borders of the scale interval.

       Parameters:
           s1 first border
           s2 second border

       Warning:
           scales might be aligned to transformation depending boundaries

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

   double QwtScaleMap::transform (double s) 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

       Returns:
           Transformed value

       See also:
           invTransform()

   QRectF QwtScaleMap::transform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QRectF & rect) [static]
       Transform a rectangle from scale to paint coordinates

       Parameters:
           xMap X map
           yMap Y map
           rect Rectangle in scale coordinates

       Returns:
           Rectangle in paint coordinates

       See also:
           invTransform()

   QPointF QwtScaleMap::transform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QPointF & pos) [static]
       Transform a point from scale to paint coordinates

       Parameters:
           xMap X map
           yMap Y map
           pos Position in scale coordinates

       Returns:
           Position in paint coordinates

       See also:
           invTransform()

Author

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