Blame c++/contourgl/contour.h

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/*
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    ......... 2015 Ivan Mahonin
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    This program is free software: you can redistribute it and/or modify
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    it under the terms of the GNU General Public License as published by
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    the Free Software Foundation, either version 3 of the License, or
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    (at your option) any later version.
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    This program is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with this program.  If not, see <http: licenses="" www.gnu.org="">.</http:>
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*/
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#ifndef _CONTOUR_H_
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#define _CONTOUR_H_
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#include <vector></vector>
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#include "geometry.h"
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#include "polyspan.h"
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class Contour
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{
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public:
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	enum ChunkType {
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		CLOSE,
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		MOVE,
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		LINE,
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		CUBIC,
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		CONIC
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	};
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	struct Chunk {
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		ChunkType type;
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		Vector p1, t0, t1;
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		Chunk(): type() { }
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		Chunk(ChunkType type, const Vector &p1, const Vector &t0 = Vector(), const Vector &t1 = Vector()):
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			type(type), p1(p1), t0(t0), t1(t1) { }
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	};
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	typedef std::vector<chunk> ChunkList;</chunk>
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private:
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	static const Vector blank;
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	ChunkList chunks;
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	size_t first;
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public:
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	bool allow_split_lines;
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	Contour(): first(0), allow_split_lines() { }
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	void clear();
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	void move_to(const Vector &v);
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	void line_to(const Vector &v);
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	void cubic_to(const Vector &v, const Vector &t0, const Vector &t1);
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	void conic_to(const Vector &v, const Vector &t);
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	void close();
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	const ChunkList& get_chunks() const { return chunks; }
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	const Vector& current() const
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		{ return chunks.empty() ? blank : chunks.back().p1; }
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	void split(Contour &c, const Rect &bounds, const Vector &min_size) const;
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	void downgrade(Contour &c, const Vector &min_size) const;
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	void transform(const Rect &from, const Rect &to);
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	void to_polyspan(Polyspan &polyspan) const;
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private:
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	void line_split(
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		Rect &ref_line_bounds,
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		const Rect &bounds,
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		const Vector &min_size,
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		const Vector &p1,
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		int level = 64 );
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	void conic_split(
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		Rect &ref_line_bounds,
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		const Rect &bounds,
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		const Vector &min_size,
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		const Vector &p1,
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		const Vector ¢er,
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		Real radius,
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		Real radians0,
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		Real radians1,
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		int level = 64 );
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	void cubic_split(
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		Rect &ref_line_bounds,
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		const Rect &bounds,
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		const Vector &min_size,
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		const Vector &p1,
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		const Vector &bezier_pp0,
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		const Vector &bezier_pp1,
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		int level = 64 );
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	static bool conic_convert(
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		const Vector &p0,
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		const Vector &p1,
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		const Vector &t,
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		Vector &out_center,
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		Real &out_radius,
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		Real &out_radians0,
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		Real &out_radians1 );
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	static Rect conic_bounds(
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		const Vector &p0,
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		const Vector &p1,
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		const Vector ¢er,
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		Real radius,
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		Real radians0,
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		Real radians1 );
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	static void cubic_convert(
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		const Vector &p0,
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		const Vector &p1,
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		const Vector &t0,
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		const Vector &t1,
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		Vector &out_bezier_pp0,
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		Vector &out_bezier_pp1 );
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	static Rect cubic_bounds(
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		const Vector &p0,
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		const Vector &p1,
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		const Vector &bezier_pp0,
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		const Vector &bezier_pp1 );
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};
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#endif