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QwtLinearColorMap(3) Qwt User's Guide QwtLinearColorMap(3) NAME
QwtLinearColorMap - QwtLinearColorMap builds a color map from color stops. SYNOPSIS
#include <qwt_color_map.h> Inherits QwtColorMap. Public Types enum Format { RGB, Indexed } enum Mode { FixedColors, ScaledColors } Public Member Functions void addColorStop (double value, const QColor &) QColor color (const QwtDoubleInterval &, double value) const QColor color1 () const QColor color2 () const virtual unsigned char colorIndex (const QwtDoubleInterval &, double value) const QwtArray< double > colorStops () const virtual QVector< QRgb > colorTable (const QwtDoubleInterval &) const virtual QwtColorMap * copy () const Format format () const Mode mode () const QwtLinearColorMap & operator= (const QwtLinearColorMap &) QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB) QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB) QwtLinearColorMap (const QwtLinearColorMap &) virtual QRgb rgb (const QwtDoubleInterval &, double value) const void setColorInterval (const QColor &color1, const QColor &color2) void setMode (Mode) virtual ~QwtLinearColorMap () 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. If mode() == FixedColors the color is calculated from the next lower color stop. If mode() == ScaledColors the color is calculated by interpolating the colors of the adjacent stops. Member Enumeration Documentation enum QwtColorMap::Format [inherited] .IP o 2 RGB The map is intended to map into QRgb values. o Indexed The map is intended to map into 8 bit values, that are indices into the color table. See also: rgb(), colorIndex(), colorTable() enum QwtLinearColorMap::Mode Mode of color map See also: setMode(), mode() 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 (const QwtLinearColorMap &other) Copy constructor. 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 QwtColorMap::color (const QwtDoubleInterval &interval, doublevalue) const [inline, inherited] Map a value into a color Parameters: interval Valid interval for values value Value Returns: Color corresponding to value Warning: This method is slow for Indexed color maps. If it is necessary to map many values, its better to get the color table once and find the color using colorIndex(). 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 QwtDoubleInterval &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. QwtArray< double > QwtLinearColorMap::colorStops () const Return all positions of color stops in increasing order QwtColorTable QwtColorMap::colorTable (const QwtDoubleInterval &interval) const [virtual, inherited] Build and return a color map of 256 colors The color table is needed for rendering indexed images in combination with using colorIndex(). Parameters: interval Range for the values Returns: A color table, that can be used for a QImage QwtColorMap * QwtLinearColorMap::copy () const [virtual] Clone the color map. Implements QwtColorMap. QwtColorMap::Format QwtColorMap::format () const [inline, inherited] Returns: Intended format of the color map See also: Format QwtLinearColorMap::Mode QwtLinearColorMap::mode () const Returns: Mode of the color map See also: setMode() QwtLinearColorMap & QwtLinearColorMap::operator= (const QwtLinearColorMap &other) Assignment operator. QRgb QwtLinearColorMap::rgb (const QwtDoubleInterval &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 Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.2 Mon Aug 1 2011 QwtLinearColorMap(3)
