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selove / src / modules / physics / box2d / ChainShape.h

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/**
* Copyright (c) 2006-2012 LOVE Development Team
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
*    claim that you wrote the original software. If you use this software
*    in a product, an acknowledgment in the product documentation would be
*    appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
*    misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
**/

#ifndef LOVE_PHYSICS_BOX2D_CHAIN_SHAPE_H
#define LOVE_PHYSICS_BOX2D_CHAIN_SHAPE_H

// Module
#include "Shape.h"
#include "EdgeShape.h"

namespace love
{
namespace physics
{
namespace box2d
{
	/**
	* A ChainShape is a freeform collection of line segments.
	**/
	class ChainShape : public Shape
	{
	private:
		// True if this ChainShape is a loop.
		bool loop;

	public:

		/**
		* Create a new ChainShape from a Box2D chain shape.
		* @param c The chain shape.
		**/
		ChainShape(b2ChainShape * c, bool loop = false, bool own = true);

		virtual ~ChainShape();

		/**
		* Establish connectivity to a vertex that follows
		* the last vertex. Fails if called on a loop.
		* @param x The x-coordinate of the vertex.
		* @param y The y-coordinate of the vertex.
		**/
		void setNextVertex(float x, float y);

		/**
		* Establish connectivity to a vertex that precedes
		* the first vertex. Fails if called on a loop.
		* @param x The x-coordinate of the vertex.
		* @param y The y-coordinate of the vertex.
		**/
		void setPrevVertex(float x, float y);

		/**
		* Gets the number of children shapes.
		**/
		int getChildCount() const;

		/**
		* Returns a child EdgeShape.
		* @param index The index of the child shape.
		* @returns The specified child.
		**/
		EdgeShape * getChildEdge(int index) const;

		/**
		* Returns the number of vertices in the shape.
		* @returns The number of vertices in the shape.
		**/
		int getVertexCount() const;

		/**
		* Returns the vertex at the given index.
		* @param index The index of the vertex.
		* @returns The specified vertex.
		**/
		b2Vec2 getPoint(int index) const;

		/**
		* Returns all of the vertices.
		* @returns The vertices the shape comprises.
		**/
		const b2Vec2 * getPoints() const;

	};

} // box2d
} // physics
} // love

#endif // LOVE_PHYSICS_BOX2D_CHAIN_SHAPE_H