QwtLinearColorMap Class Reference

Inheritance diagram for QwtLinearColorMap:

[legend]Collaboration diagram for QwtLinearColorMap:

[legend]List of all members.

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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.

Definition at line 111 of file qwt_color_map.h.

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

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Member Enumeration Documentation

enum QwtLinearColorMap::Mode

Mode of color map See also: setMode(), mode() Definition at line 118 of file qwt_color_map.h.

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Constructor & Destructor Documentation

QwtLinearColorMap::QwtLinearColorMap (  QwtColorMap::Format  format = 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 Definition at line 211 of file qwt_color_map.cpp. References setColorInterval(). Referenced by copy().

QwtLinearColorMap::QwtLinearColorMap (  const QColor &  color1, const QColor &  color2, QwtColorMap::Format  format = 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 Definition at line 235 of file qwt_color_map.cpp. References setColorInterval().

QwtLinearColorMap::QwtLinearColorMap (  const QwtLinearColorMap &   )

Copy constructor. Definition at line 221 of file qwt_color_map.cpp.

QwtLinearColorMap::~QwtLinearColorMap (   )  [virtual]

Destructor. Definition at line 245 of file qwt_color_map.cpp.

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Member Function Documentation

void QwtLinearColorMap::addColorStop (  double  value, 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 Definition at line 319 of file qwt_color_map.cpp.

QColor QwtLinearColorMap::color1 (   )  const

Returns: the first color of the color range See also: setColorInterval() Definition at line 337 of file qwt_color_map.cpp.

QColor QwtLinearColorMap::color2 (   )  const

Returns: the second color of the color range See also: setColorInterval() Definition at line 346 of file qwt_color_map.cpp.

unsigned char QwtLinearColorMap::colorIndex (  const QwtDoubleInterval &  interval, double  value )  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. Definition at line 370 of file qwt_color_map.cpp. References QwtDoubleInterval::isValid(), QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), and QwtDoubleInterval::width().

QwtArray< double > QwtLinearColorMap::colorStops (   )  const

Return all positions of color stops in increasing order Definition at line 328 of file qwt_color_map.cpp.

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

Clone the color map. Implements QwtColorMap. Definition at line 260 of file qwt_color_map.cpp. References QwtLinearColorMap().

QwtLinearColorMap::Mode QwtLinearColorMap::mode (   )  const

Returns: Mode of the color map See also: setMode() Definition at line 286 of file qwt_color_map.cpp.

QwtLinearColorMap & QwtLinearColorMap::operator= (  const QwtLinearColorMap &   )

Assignment operator. Definition at line 251 of file qwt_color_map.cpp. References d_data.

QRgb QwtLinearColorMap::rgb (  const QwtDoubleInterval &  interval, double  value )  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. Definition at line 357 of file qwt_color_map.cpp. References QwtDoubleInterval::minValue(), and QwtDoubleInterval::width().

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() Definition at line 301 of file qwt_color_map.cpp. Referenced by QwtLinearColorMap().

void QwtLinearColorMap::setMode (  Mode  mode  )

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() Definition at line 277 of file qwt_color_map.cpp.

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