/* -*- C++ -*-
 * Copyright ©2004 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 XFMAP_CYLORTHOGRAPHIC_H
#define XFMAP_CYLORTHOGRAPHIC_H

#include "magellan/xfmap.h"

class XfMap_CylindricalOrthographic : public XfMap
{
 public:
	XfMap_CylindricalOrthographic(double std)
		: stdparallel(std),
		  scale(cos(std))
	{ }
	virtual ~XfMap_CylindricalOrthographic() { }

	virtual bool f(dvec2&, const dvec3&) const;
	virtual bool g(dvec3&, const dvec2&) const;

	static XfMap* parser(
		ConfigLexer* lex,
		const std::string& type,
		const std::string& subtype = ""
		);

	class CylindricalOrthographic_TraceState : public TraceState
	{
	public:
		virtual ~CylindricalOrthographic_TraceState() { }
		dvec2 previous; // Only need this representation, because all
						// points on the sphere map to points on the
						// map
	};

	// Initialise a path trace at a given point
	virtual TraceState* initpath(TPCInsertIterator it,
								 const dvec3& point) const;

	// Takes 3D points as input. Map and insert the relevant 2D points
	// (including start and end), if any, using the iterator. Should
	// use f(), ideally.
	virtual void pathpoint(TraceState* state,
						   TPCInsertIterator it,
						   const dvec3& point) const;

	// Add segments of a path around the edge of the projection
	// between two given lambda values. Include the start point, but
	// not the end point.
	virtual void tracepath(TPCInsertIterator it,
						   double startlambda, double endlambda) const;

private:
	double stdparallel;
	double scale;
};

#endif