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love / src / modules / physics / box2d / ChainShape.cpp

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/**
 * Copyright (c) 2006-2013 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.
 **/

#include "ChainShape.h"

// Module
#include "Body.h"
#include "World.h"
#include "Physics.h"

#include "common/Memoizer.h"

namespace love
{
namespace physics
{
namespace box2d
{

ChainShape::ChainShape(b2ChainShape *c, bool loop, bool own)
	: Shape(c, own), loop(loop)
{
}

ChainShape::~ChainShape()
{
}

void ChainShape::setNextVertex(float x, float y)
{
	if (loop)
	{
		throw love::Exception("Physics error: Can't call setNextVertex on a loop ChainShape");
		return;
	}
	b2Vec2 v(x, y);
	b2ChainShape *c = (b2ChainShape *)shape;
	c->SetNextVertex(Physics::scaleDown(v));
}

void ChainShape::setPrevVertex(float x, float y)
{
	if (loop)
	{
		throw love::Exception("Physics error: Can't call setPrevVertex on a loop ChainShape");
		return;
	}
	b2Vec2 v(x, y);
	b2ChainShape *c = (b2ChainShape *)shape;
	c->SetNextVertex(Physics::scaleDown(v));
}

EdgeShape *ChainShape::getChildEdge(int index) const
{
	b2ChainShape *c = (b2ChainShape *)shape;
	b2EdgeShape e;
	c->GetChildEdge(&e, index);
	EdgeShape *edge = (EdgeShape *)Memoizer::find(&e);
	if (!edge)
		return new EdgeShape(&e);
	else
	{
		edge->retain();
		return edge;
	}
}

int ChainShape::getChildCount() const
{
	b2ChainShape *c = (b2ChainShape *)shape;
	return c->GetChildCount();
}

int ChainShape::getVertexCount() const
{
	b2ChainShape *c = (b2ChainShape *)shape;
	return c->m_count;
}

b2Vec2 ChainShape::getPoint(int index) const
{
	b2ChainShape *c = (b2ChainShape *)shape;
	if (index < 0 || index >= c->m_count)
		throw love::Exception("Physics error: index out of bounds");
	const b2Vec2 &v = c->m_vertices[index];
	return Physics::scaleUp(v);
}

const b2Vec2 *ChainShape::getPoints() const
{
	b2ChainShape *c = (b2ChainShape *)shape;
	return c->m_vertices;
}

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