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123 lines
3.2 KiB
123 lines
3.2 KiB
/*
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Rosegarden
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A sequencer and musical notation editor.
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This program is Copyright 2000-2008
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Guillaume Laurent <glaurent@telegraph-road.org>,
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Chris Cannam <cannam@all-day-breakfast.com>,
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Richard Bown <bownie@bownie.com>
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This file is Copyright 2003
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Mark Hymers <markh@linuxfromscratch.org>
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The moral right of the authors to claim authorship of this work
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has been asserted.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#ifndef _BASE_COLOUR_H_
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#define _BASE_COLOUR_H_
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#include <string>
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namespace Rosegarden
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{
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/**
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* Colour is our internal colour storage mechanism; it's extremely basic
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* but does what it needs to
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*/
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class Colour
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{
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public:
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/**
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* Create a Colour with values initialised to r=0, g=0, b=0
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* i.e. Black.
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*/
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Colour();
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/**
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* Create a Colour with the specified red, green, blue values.
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* If out of specification (i.e. < 0 || > 255 the value will be set to 0.
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*/
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Colour(unsigned int red, unsigned int green, unsigned int blue);
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Colour(const Colour& input);
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~Colour();
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Colour& operator= (const Colour& input);
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/**
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* Set the colour as appropriate; as with the constructor invalid values
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* will be set to 0.
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*/
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void setColour(unsigned int red, unsigned int green, unsigned int blue);
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/**
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* Sets the three pointers to the values stored in the colour.
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*/
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void getColour(unsigned int &red, unsigned int &green, unsigned int &blue) const;
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/**
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* Returns the current Red value of the colour as an integer.
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*/
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unsigned int getRed() const;
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/**
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* Returns the current Blue value of the colour as an integer.
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*/
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unsigned int getBlue() const;
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/**
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* Returns the current Green value of the colour as an integer.
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*/
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unsigned int getGreen() const;
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/**
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* Sets the Red value of the current colour. If the value isn't
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* between 0 and 255 inclusive, it will set to 0
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*/
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void setRed(unsigned int input);
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/**
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* Sets the Blue value of the current colour. If the value isn't
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* between 0 and 255 inclusive, it will set to 0
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*/
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void setBlue(unsigned int input);
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/**
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* Sets the Green value of the current colour. If the value isn't
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* between 0 and 255 inclusive, it will set to 0
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*/
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void setGreen(unsigned int input);
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/**
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* This uses a simple calculation to give us a contrasting colour.
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* Useful for working out a visible text colour given
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* any background colour
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*/
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Colour getContrastingColour() const;
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std::string toXmlString() const;
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std::string dataToXmlString() const;
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private:
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unsigned int m_r, m_g, m_b;
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};
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/**
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* This works out a colour which is directly in between the two inputs.
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* Useful for working out what overlapping Segments should be coloured as
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*/
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Colour getCombinationColour(const Colour &input1, const Colour &input2);
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}
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#endif
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