/* -*- C++ -*-
 * Copyright ©2005 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 DATABLOCK_H
#define DATABLOCK_H

#include <iostream>
#include <fstream>
#include <string>

#include "coordinate.h"
#include "crossing.h"

// This should be a container for the data
class DataBlock
{
public:
	DataBlock(const std::string& base_name);
	virtual ~DataBlock();

	int width(void) const { return _width; }
	int height(void) const { return _height; }

	signed short int data(const iCoordinate& c) const;

	Crossing next(int height);

	bool valid(const Crossing& e) const;
	void visit(const Crossing& e) { visit(e, true); }
	void unvisit(const Crossing& e) { visit(e, false); }
	bool visited(const Crossing& e) const;

	bool crossed(const Crossing& e, int z) const;
	Coordinate intercept(const Crossing& e, int z) const;

	void dump_local(const iCoordinate& e) const;	

private:
	FILE* datafile;
	int length;
	char* _data;
	int _width;
	int _height;
	int _vc;
	int _visitmax;
	int next_x, next_y, next_phase;

	char* _visited_nsedges;
	char* _visited_ewedges;
	char* _visited_corners;
	void visit(const Crossing& e, bool v);
};

#endif