/* -*- C++ -*-
 * Copyright ©2008 Hugo Mills <hugo@carfax.org.uk>
 *
 * This software is distributed under the terms of the GNU GPL v3
 * For more information on the GPL, see the file COPYING or 
 * visit http://www.gnu.org/
 *
 * This software is distributed without warranty
 */

#ifndef CONTENT_TERMINATOR_H
#define CONTENT_TERMINATOR_H

#include <list>

#include "magellan/configlexer.h"
#include "magellan/content.h"
#include "magellan/xforbit.h"

class Content_Terminator : public Content
{
public:
	Content_Terminator();
	virtual ~Content_Terminator();

	static Content* parse(
		ConfigLexer* lex,
		const std::string& type,
		const std::string& subtype
		);

	virtual void plot(Output*, XfView*, XfMap*, XfOrbit*, XfSphere*);
	virtual bool isbound(void) const;
	virtual Plugin* bind(Configuration*);

private:
	Content* day;
	Content* night;
	XfOrbit* sunpos;
	int blend;
	double bwidth;

	void blendcolours(ivec3& result, 
					  const ivec3& day, const ivec3& night,
					  double darkness) const;

	typedef double (Content_Terminator::*DarkFunction)(double) const;
	static DarkFunction darkfns[];

	double dfn_linear(double) const;
	double dfn_quadratic(double) const;
	double dfn_normal(double) const;
};

#endif