/*

    ......... 2015 Ivan Mahonin

    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 3 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef _CONTOUR_H_

#define _CONTOUR_H_

#include <vector>

#include "geometry.h"

#include "polyspan.h"

class Contour

{

public:

	enum ChunkType {

		CLOSE,

		MOVE,

		LINE,

		CUBIC,

		CONIC

	};

	struct Chunk {

		ChunkType type;

		Vector p1, t0, t1;

		Chunk(): type() { }

		Chunk(ChunkType type, const Vector &p1, const Vector &t0 = Vector(), const Vector &t1 = Vector()):

			type(type), p1(p1), t0(t0), t1(t1) { }

	};

	typedef std::vector<Chunk> ChunkList;

private:

	static const Vector blank;

	ChunkList chunks;

	size_t first;

public:

	Contour(): first(0) { }

	void clear();

	void move_to(const Vector &v);

	void line_to(const Vector &v);

	void cubic_to(const Vector &v, const Vector &t0, const Vector &t1);

	void conic_to(const Vector &v, const Vector &t);

	void close();

	const ChunkList& get_chunks() const { return chunks; }

	const Vector& current() const

		{ return chunks.empty() ? blank : chunks.back().p1; }

	void split(Contour &c, const Rect &bounds, const Vector &min_size) const;

	void transform(const Rect &from, const Rect &to);

	void to_polyspan(Polyspan &polyspan) const;

private:

	void line_split(

		Rect &ref_line_bounds,

		const Rect &bounds,

		const Vector &min_size,

		const Vector &p1 );

	void conic_split(

		Rect &ref_line_bounds,

		const Rect &bounds,

		const Vector &min_size,

		const Vector &p1,

		const Vector &center,

		Real radius,

		Real radians0,

		Real radians1,

		int level = 64 );

	void cubic_split(

		Rect &ref_line_bounds,

		const Rect &bounds,

		const Vector &min_size,

		const Vector &p1,

		const Vector &bezier_pp0,

		const Vector &bezier_pp1,

		int level = 64 );

	static bool conic_convert(

		const Vector &p0,

		const Vector &p1,

		const Vector &t,

		Vector &out_center,

		Real &out_radius,

		Real &out_radians0,

		Real &out_radians1 );

	static Rect conic_bounds(

		const Vector &p0,

		const Vector &p1,

		const Vector &center,

		Real radius,

		Real radians0,

		Real radians1 );

	static void cubic_convert(

		const Vector &p0,

		const Vector &p1,

		const Vector &t0,

		const Vector &t1,

		Vector &out_bezier_pp0,

		Vector &out_bezier_pp1 );

	static Rect cubic_bounds(

		const Vector &p0,

		const Vector &p1,

		const Vector &bezier_pp0,

		const Vector &bezier_pp1 );

};

#endif