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Colour.h

// -*- c-basic-offset: 4 -*-


/*
    Rosegarden
    A sequencer and musical notation editor.
    Copyright 2000-2009 the Rosegarden development team.
    See the AUTHORS file for more details.

    This file is Copyright 2003
        Mark Hymers         <markh@linuxfromscratch.org>

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _BASE_COLOUR_H_
#define _BASE_COLOUR_H_

#include <string>

namespace Rosegarden 
{

/**
 * Colour is our internal colour storage mechanism; it's extremely basic
 * but does what it needs to
 */

00033 class Colour
{
public:
    /**
     * Create a Colour with values initialised to r=0, g=0, b=0
     * i.e. Black. 
     */
    Colour();

    /**
     * Create a Colour with the specified red, green, blue values.
     * If out of specification (i.e. < 0 || > 255 the value will be set to 0.
     */
    Colour(unsigned int red, unsigned int green, unsigned int blue);
    Colour(const Colour& input);

    ~Colour();
    Colour& operator= (const Colour& input);

    /**
     * Set the colour as appropriate; as with the constructor invalid values
     * will be set to 0.
     */
    void setColour(unsigned int red, unsigned int green, unsigned int blue);

    /**
     * Sets the three pointers to the values stored in the colour.
     */ 
    void getColour(unsigned int &red, unsigned int &green, unsigned int &blue) const;

    /**
     * Returns the current Red value of the colour as an integer.
     */
    unsigned int getRed() const;

    /**
     * Returns the current Blue value of the colour as an integer.
     */
    unsigned int getBlue() const;

    /**
     * Returns the current Green value of the colour as an integer.
     */
    unsigned int getGreen() const;

    /**
     * Sets the Red value of the current colour.  If the value isn't
     * between 0 and 255 inclusive, it will set to 0
     */
    void setRed(unsigned int input);

    /**
     * Sets the Blue value of the current colour.  If the value isn't
     * between 0 and 255 inclusive, it will set to 0
     */
    void setBlue(unsigned int input);

    /**
     * Sets the Green value of the current colour.  If the value isn't
     * between 0 and 255 inclusive, it will set to 0
     */
    void setGreen(unsigned int input);

    /**
     * This uses a simple calculation to give us a contrasting colour.
     * Useful for working out a visible text colour given
     * any background colour
     */
    Colour getContrastingColour() const;

    std::string toXmlString() const;

    std::string dataToXmlString() const;

private:
    unsigned int m_r, m_g, m_b;
};

    /**
     * This works out a colour which is directly in between the two inputs.
     * Useful for working out what overlapping Segments should be coloured as
     */
    Colour getCombinationColour(const Colour &input1, const Colour &input2);

}

#endif

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