NAME¶

QwtLinearColorMap -

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) QwtLinearColorMap (const QwtLinearColorMap &) virtual ~QwtLinearColorMap () void addColorStop (double value, const QColor &) QColor color1 () const QColor color2 () const virtual unsigned char colorIndex (const QwtDoubleInterval &, double value) const QwtArray< double > colorStops () const virtual QwtColorMap * copy () const Mode mode () const QwtLinearColorMap & operator= (const QwtLinearColorMap &) virtual QRgb rgb (const QwtDoubleInterval &, double value) const void setColorInterval (const QColor &color1, const QColor & color2) void setMode (Mode)

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 QwtLinearColorMap::Mode¶

Mode of color map See also:

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:

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:

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:

QColor QwtLinearColorMap::color1 () const¶

Returns: See also:

QColor QwtLinearColorMap::color2 () const¶

Returns: See also:

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: Implements QwtColorMap.

QwtArray< double > QwtLinearColorMap::colorStops () const¶

Return all positions of color stops in increasing order

QwtLinearColorMap::Mode QwtLinearColorMap::mode () const¶

Returns: See also:

QRgb QwtLinearColorMap::rgb (const QwtDoubleInterval &interval, doublevalue) const [virtual]¶

Map a value of a given interval into a rgb value Parameters: Implements QwtColorMap.

void QwtLinearColorMap::setColorInterval (const QColor &color1, const QColor &color2)¶

Set the color range Add stops at 0.0 and 1.0. Parameters: See also:

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:

Author¶

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