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qwtscalemap(3) [debian man page]

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

NAME

       QwtScaleMap -

       A scale map.

SYNOPSIS

       #include <qwt_scale_map.h>

   Public Member Functions
       double invTransform (double i) const
       QwtScaleMap & operator= (const QwtScaleMap &)
       double p1 () const
       double p2 () const
       double pDist () const
       QwtScaleMap (const QwtScaleMap &)
       QwtScaleMap ()
       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
       ~QwtScaleMap ()

   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 (const QwtScaleMap &other)
       Copy constructor.

   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()

   QwtScaleMap & QwtScaleMap::operator= (const QwtScaleMap &other)
       Assignment operator.

   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()

   const QwtScaleTransformation * QwtScaleMap::transformation () const
       Get the transformation.

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

Version 5.2.2							  Mon Aug 1 2011						    QwtScaleMap(3)

Check Out this Related Man Page

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

NAME

       QwtScaleTransformation -

       Operations for linear or logarithmic (base 10) transformations.

SYNOPSIS

       #include <qwt_scale_map.h>

   Public Types
       enum Type { Linear, Log10, Other }

   Public Member Functions
       virtual QwtScaleTransformation * copy () const
       virtual double invXForm (double x, double p1, double p2, double s1, double s2) const
       QwtScaleTransformation (Type type)
       Type type () const
       virtual double xForm (double x, double s1, double s2, double p1, double p2) const
       virtual ~QwtScaleTransformation ()

Detailed Description
       Operations for linear or logarithmic (base 10) transformations.

Constructor &; Destructor Documentation
   QwtScaleTransformation::QwtScaleTransformation (Typetype)
       Constructor for a linear transformation.

   QwtScaleTransformation::~QwtScaleTransformation () [virtual]
       Destructor.

Member Function Documentation
   QwtScaleTransformation * QwtScaleTransformation::copy () const [virtual]
       Create a clone of the transformation.

   double QwtScaleTransformation::invXForm (doublep, doublep1, doublep2, doubles1, doubles2) const [virtual]
       Transform a value from the coordinate system of the paint device into the coordinate system of a scale. Parameters:
	   p Value related to the coordinate system of the paint device
	   p1 First border of the coordinate system of the paint device
	   p2 Second border of the coordinate system of the paint device
	   s1 First border of the coordinate system of the scale
	   s2 Second border of the coordinate system of the scale

       Returns:

	   linear mapping:
	       s1 + ( s2 - s1 ) / ( p2 - p1 ) * ( p - p1 );

	   log10 mapping:
	       exp((p - p1) / (p2 - p1) * log(s2 / s1)) * s1;

   QwtScaleTransformation::Type QwtScaleTransformation::type () const [inline] Returns:
	   Transformation type

   double QwtScaleTransformation::xForm (doubles, doubles1, doubles2, doublep1, doublep2) const [virtual]
       Transform a value from the coordinate system of a scale into the coordinate system of the paint device. Parameters:
	   s Value related to the coordinate system of the scale
	   s1 First border of the coordinate system of the scale
	   s2 Second border of the coordinate system of the scale
	   p1 First border of the coordinate system of the paint device
	   p2 Second border of the coordinate system of the paint device

       Returns:

	   linear mapping:
	       p1 + (p2 - p1) / (s2 - s1) * (s - s1);

	   log10 mapping:
	       p1 + (p2 - p1) / log(s2 / s1) * log(s / s1);

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

Version 5.2.2							  Mon Aug 1 2011					 QwtScaleTransformation(3)
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