QwtScaleMap(3)                 Qwt User's Guide                 QwtScaleMap(3)

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.

       Definition at line 26 of file qwt_scale_map.h.

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

       Definition at line 21 of file qwt_scale_map.cpp.

   QwtScaleMap::~QwtScaleMap ()
       Destructor

       Definition at line 49 of file qwt_scale_map.cpp.

Member Function Documentation
   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()

       Definition at line 187 of file qwt_scale_map.cpp.

   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()

       Definition at line 224 of file qwt_scale_map.cpp.

   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()

       Definition at line 154 of file qwt_scale_map.h.

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

       Definition at line 164 of file qwt_scale_map.h.

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

       Definition at line 99 of file qwt_scale_map.h.

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

       Definition at line 107 of file qwt_scale_map.h.

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

       Definition at line 115 of file qwt_scale_map.h.

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

       Definition at line 83 of file qwt_scale_map.h.

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

       Definition at line 91 of file qwt_scale_map.h.

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

       Definition at line 123 of file qwt_scale_map.h.

   void QwtScaleMap::setPaintInterval (double p1, double p2)
       Specify the borders of the paint device interval.

       Parameters
           p1 first border
           p2 second border

       Definition at line 119 of file qwt_scale_map.cpp.

   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

       Definition at line 100 of file qwt_scale_map.cpp.

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

       Definition at line 76 of file qwt_scale_map.cpp.

   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()

       Definition at line 206 of file qwt_scale_map.cpp.

   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()

       Definition at line 153 of file qwt_scale_map.cpp.

   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()

       Definition at line 137 of file qwt_scale_map.h.


Author
       Generated automatically by Doxygen for Qwt User's Guide from the source
       code.

Version 6.2.0                   Sun Jul 18 2021                 QwtScaleMap(3)