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/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
This file is Copyright 2003
Mark Hymers <markh@linuxfromscratch.org>
The moral right of the authors to claim authorship of this work
has been asserted.
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
*/
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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