trusty (3) QwtLinearColorMap.3.gz

NAME

       QwtLinearColorMap -

       QwtLinearColorMap builds a color map from color stops.

SYNOPSIS

       #include <qwt_color_map.h>

       Inherits QwtColorMap.

   Public Types
       enum Mode { FixedColors, ScaledColors }

   Public Member Functions
       QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB)
       QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB)
       virtual ~QwtLinearColorMap ()
       void setMode (Mode)
       Mode mode () const
       void setColorInterval (const QColor &color1, const QColor &color2)
       void addColorStop (double value, const QColor &)
       QVector< double > colorStops () const
       QColor color1 () const
       QColor color2 () const
       virtual QRgb rgb (const QwtInterval &, double value) const
       virtual unsigned char colorIndex (const QwtInterval &, double value) const

Detailed Description

       QwtLinearColorMap builds a color map from color stops.

       A color stop is a color at a specific position. The valid range for the positions is [0.0, 1.0]. When
       mapping a value into a color it is translated into this interval according to mode().

Member Enumeration Documentation

   enum QwtLinearColorMap::Mode Mode of color map
       See also:
           setMode(), mode()

       Enumerator:

       FixedColors
              Return the color from the next lower color stop.

       ScaledColors
              Interpolating the colors of the adjacent stops.

Constructor & Destructor Documentation

   QwtLinearColorMap::QwtLinearColorMap (QwtColorMap::Formatformat = QwtColorMap::RGB) Build a color map with
       two stops at 0.0 and 1.0. The color at 0.0 is Qt::blue, at 1.0 it is Qt::yellow.
       Parameters:
           format Preferred format of the color map

   QwtLinearColorMap::QwtLinearColorMap (const QColor &color1, const QColor &color2, QwtColorMap::Formatformat =
       QwtColorMap::RGB) Build a color map with two stops at 0.0 and 1.0.
       Parameters:
           color1 Color used for the minimum value of the value interval
           color2 Color used for the maximum value of the value interval
           format Preferred format of the coor map

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

Member Function Documentation

   void QwtLinearColorMap::addColorStop (doublevalue, const QColor &color) Add a color stop
       The value has to be in the range [0.0, 1.0]. F.e. a stop at position 17.0 for a range [10.0,20.0] must be
       passed as: (17.0 - 10.0) / (20.0 - 10.0)

       Parameters:
           value Value between [0.0, 1.0]
           color Color stop

   QColor QwtLinearColorMap::color1 () const Returns:
           the first color of the color range

       See also:
           setColorInterval()

   QColor QwtLinearColorMap::color2 () const Returns:
           the second color of the color range

       See also:
           setColorInterval()

   unsigned char QwtLinearColorMap::colorIndex (const QwtInterval &interval, doublevalue) const [virtual] Map a
       value of a given interval into a color index, between 0 and 255
       Parameters:
           interval Range for all values
           value Value to map into a color index

       Implements QwtColorMap.

   QVector< double > QwtLinearColorMap::colorStops () const Return all positions of color stops in increasing
       order
   QwtLinearColorMap::Mode QwtLinearColorMap::mode () const Returns:
           Mode of the color map

       See also:
           setMode()

   QRgb QwtLinearColorMap::rgb (const QwtInterval &interval, doublevalue) const [virtual] Map a value of a given
       interval into a rgb value
       Parameters:
           interval Range for all values
           value Value to map into a rgb value

       Implements QwtColorMap.

   void QwtLinearColorMap::setColorInterval (const QColor &color1, const QColor &color2) Set the color range
       Add stops at 0.0 and 1.0.

       Parameters:
           color1 Color used for the minimum value of the value interval
           color2 Color used for the maximum value of the value interval

       See also:
           color1(), color2()

   void QwtLinearColorMap::setMode (Modemode)
       Set the mode of the color map. FixedColors means the color is calculated from the next lower color stop.
       ScaledColors means the color is calculated by interpolating the colors of the adjacent stops.

       See also:
           mode()

Author

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