QwtLinearColorMap builds a color map from color stops. More...

#include <qwt_color_map.h>

Inheritance diagram for QwtLinearColorMap:

Classes
class	ColorStops
class	PrivateData
Public Types
enum	Mode { FixedColors, ScaledColors }
Public Member Functions
void	addColorStop (double value, const QColor &)
QColor	color1 () const
QColor	color2 () const
virtual uint	colorIndex (int numColors, const QwtInterval &, double value) const
	Map a value of a given interval into a color index.
QVector< double >	colorStops () const
Mode	mode () const
	QwtLinearColorMap (QwtColorMap::Format=QwtColorMap::RGB)
	QwtLinearColorMap (const QColor &from, const QColor &to, QwtColorMap::Format=QwtColorMap::RGB)
virtual QRgb	rgb (const QwtInterval &, double value) const
void	setColorInterval (const QColor &color1, const QColor &color2)
void	setMode (Mode)
	Set the mode of the color map.
virtual	~QwtLinearColorMap ()
	Destructor.
Private Attributes
PrivateData *	d_data

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().

Definition at line 95 of file qwt_color_map.h.

Member Enumeration Documentation

enum QwtLinearColorMap::Mode

Mode of color map

See also:: setMode(), mode()

Enumerator:

FixedColors	Return the color from the next lower color stop.
ScaledColors	Interpolating the colors of the adjacent stops.

Definition at line 102 of file qwt_color_map.h.

Constructor & Destructor Documentation

QwtLinearColorMap::QwtLinearColorMap ( QwtColorMap::Format format = QwtColorMap::RGB ) [explicit]

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 381 of file qwt_color_map.cpp.

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 for the color map

Definition at line 397 of file qwt_color_map.cpp.

QwtLinearColorMap::~QwtLinearColorMap ( ) [virtual]

Destructor.

Definition at line 407 of file qwt_color_map.cpp.

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 463 of file qwt_color_map.cpp.

QColor QwtLinearColorMap::color1 ( ) const

Returns:: the first color of the color range

See also:: setColorInterval()

Definition at line 481 of file qwt_color_map.cpp.

QColor QwtLinearColorMap::color2 ( ) const

Returns:: the second color of the color range

See also:: setColorInterval()

Definition at line 490 of file qwt_color_map.cpp.

uint QwtLinearColorMap::colorIndex	(	int	numColors,
		const QwtInterval &	interval,
		double	value
	)		const `[virtual]`

Map a value of a given interval into a color index.

Parameters:

numColors	Size of the color table
interval	Range for all values
value	Value to map into a color index

Returns:: Index, between 0 and 255

Note:: NaN values are mapped to 0

Reimplemented from QwtColorMap.

Definition at line 529 of file qwt_color_map.cpp.

QVector< double > QwtLinearColorMap::colorStops ( ) const

Returns:: Positions of color stops in increasing order

Definition at line 472 of file qwt_color_map.cpp.

QwtLinearColorMap::Mode QwtLinearColorMap::mode ( ) const

Returns:: Mode of the color map

See also:: setMode()

Definition at line 430 of file qwt_color_map.cpp.

QRgb QwtLinearColorMap::rgb	(	const QwtInterval &	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

Returns:: RGB value for value

Implements QwtColorMap.

Definition at line 503 of file qwt_color_map.cpp.

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 445 of file qwt_color_map.cpp.

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 421 of file qwt_color_map.cpp.

Member Data Documentation

PrivateData* QwtLinearColorMap::d_data [private]

Definition at line 134 of file qwt_color_map.h.

The documentation for this class was generated from the following files:

Classes

Public Types

Public Member Functions

Private Attributes

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation