/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 STARK_MOVEMENT_STRING_PULLING_PATH_H
#define STARK_MOVEMENT_STRING_PULLING_PATH_H

#include "common/array.h"

#include "math/vector3d.h"

namespace Stark {

/**
 * Store a path and allow to walk along it smoothly
 *
 * The base principle of the string pulling algorithm is to skip steps
 * if it is possible to walk directly to a later step in straight line.
 */
class StringPullingPath {
public:
	StringPullingPath();

	/** Append a step to the path */
	void addStep(const Math::Vector3d &position);

	/** Reset the steps, and the current target on the path */
	void reset();

	/** Move the walk target forward according to the position */
	Math::Vector3d computeWalkTarget(const Math::Vector3d &fromPosition);

	/** Returns true if this path is not degenerated (empty or single point) */
	bool hasSteps() const;

private:
	Common::Array<Math::Vector3d> _steps;
	uint32 _targetStep;
};

} // End of namespace Stark

#endif // STARK_MOVEMENT_STRING_PULLING_PATH_H