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 • 2¶

RGB
The map is intended to map into QRgb values.

•

Indexed

 

The map is intended to map into 8 bit values, that are indices into the color table.

See also:

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:

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:

QColor QwtColorMap::color (const QwtDoubleInterval &interval, doublevalue) const [inline, inherited] Map a value into a color¶

Parameters: Returns: Warning:

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¶

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: Returns:

QwtColorMap * QwtLinearColorMap::copy () const [virtual]¶

Clone the color map. Implements QwtColorMap.

QwtColorMap::Format QwtColorMap::format () const [inline, inherited] Returns:¶

See also:

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

See also:

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: 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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