QwtAlphaColorMap Class Reference

QwtAlphaColorMap variies the alpha value of a color. More...

#include <qwt_color_map.h>

Inheritance diagram for QwtAlphaColorMap:

Collaboration diagram for QwtAlphaColorMap:

List of all members.

Classes
class	PrivateData
Public Member Functions
	QwtAlphaColorMap (const QColor &=QColor(Qt::gray))
	QwtAlphaColorMap (const QwtAlphaColorMap &)
virtual	~QwtAlphaColorMap ()
	Destructor.
QwtAlphaColorMap &	operator= (const QwtAlphaColorMap &)
virtual QwtColorMap *	copy () const
	Clone the color map.
void	setColor (const QColor &)
QColor	color () const
virtual QRgb	rgb (const QwtDoubleInterval &, double value) const
	Map a value of a given interval into a alpha value.

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Detailed Description

QwtAlphaColorMap variies the alpha value of a color.

Definition at line 160 of file qwt_color_map.h.

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Constructor & Destructor Documentation

QwtAlphaColorMap::QwtAlphaColorMap

(

const QColor &

color = QColor(Qt::gray) )

Constructor

Parameters:

color

Color of the map

Definition at line 409 of file qwt_color_map.cpp.

References color(), QwtAlphaColorMap::PrivateData::color, and QwtAlphaColorMap::PrivateData::rgb.

Referenced by copy().

                                                     :
    QwtColorMap(QwtColorMap::RGB)
{
    d_data = new PrivateData;
    d_data->color = color;
    d_data->rgb = color.rgb() & qRgba(255, 255, 255, 0);
}

QwtAlphaColorMap::QwtAlphaColorMap

(

const QwtAlphaColorMap &

other )

Copy constructor

Parameters:

other

Other color map

Definition at line 421 of file qwt_color_map.cpp.

                                                               :
    QwtColorMap(other)
{
    d_data = new PrivateData;
    *this = other;
}

QwtAlphaColorMap::~QwtAlphaColorMap

(

)

[virtual]

Destructor.

Definition at line 429 of file qwt_color_map.cpp.

{
    delete d_data;
}

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Member Function Documentation

QColor QwtAlphaColorMap::color

(

)

const

Returns:

the color

See also:

setColor()

Definition at line 472 of file qwt_color_map.cpp.

References QwtAlphaColorMap::PrivateData::color.

Referenced by QwtAlphaColorMap(), and setColor().

{
    return d_data->color;
}

QwtColorMap * QwtAlphaColorMap::copy

(

)

const [virtual]

Clone the color map.

Implements QwtColorMap.

Definition at line 448 of file qwt_color_map.cpp.

References QwtAlphaColorMap().

{
    QwtAlphaColorMap* map = new QwtAlphaColorMap();
    *map = *this;

    return map;
}

QwtAlphaColorMap & QwtAlphaColorMap::operator=

(

const QwtAlphaColorMap &

other )

Assignment operator

Parameters:

other

Other color map

Returns:

*this

Definition at line 439 of file qwt_color_map.cpp.

{
    QwtColorMap::operator=(other);
    *d_data = *other.d_data;
    return *this;
}

QRgb QwtAlphaColorMap::rgb	(	const QwtDoubleInterval &	interval,
		double	value
	)		const [virtual]

Map a value of a given interval into a alpha value.

alpha := (value - interval.minValue()) / interval.width();

Parameters:

interval	Range for all values
value	Value to map into a rgb value

Returns:

rgb value, with an alpha value

Implements QwtColorMap.

Definition at line 486 of file qwt_color_map.cpp.

References QwtDoubleInterval::minValue(), QwtAlphaColorMap::PrivateData::rgb, and QwtDoubleInterval::width().

{
    const double width = interval.width();
    if ( width >= 0.0 )
    {
        const double ratio = (value - interval.minValue()) / width;
        int alpha = qRound(255 * ratio);
        if ( alpha < 0 )
            alpha = 0;
        if ( alpha > 255 )
            alpha = 255;

        return d_data->rgb | (alpha << 24);
    }
    return d_data->rgb;
}

void QwtAlphaColorMap::setColor

(

const QColor &

color )

Set the color

Parameters:

color

Color

See also:

color()

Definition at line 462 of file qwt_color_map.cpp.

References color(), QwtAlphaColorMap::PrivateData::color, and QwtAlphaColorMap::PrivateData::rgb.

{
    d_data->color = color;
    d_data->rgb = color.rgb();
}

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

• qwt_color_map.h
• qwt_color_map.cpp