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: 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:

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:

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:

QColor QwtLinearColorMap::color1 () const Returns:¶

See also:

QColor QwtLinearColorMap::color2 () const Returns:¶

See also:

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: Implements QwtColorMap.

QVector< 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 QwtInterval &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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