Add ChainShape

--HG--
branch : box2d-update

src/modules/physics/box2d/ChainShape.cpp

@@ -0,0 +1,95 @@
+/**
+* Copyright (c) 2006-2011 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"
+
+namespace love
+{
+namespace physics
+{
+namespace box2d
+{
+	ChainShape::ChainShape(b2ChainShape * c, bool loop)
+		: loop(loop)
+	{
+		shape = c;
+	}
+
+	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);
+		return new EdgeShape(&e);
+	}
+	
+	int ChainShape::getVertexCount() const
+	{
+		b2ChainShape * c = (b2ChainShape *)shape;
+		return c->GetVertexCount();
+	}
+	
+	b2Vec2 ChainShape::getVertex(int index) const
+	{
+		b2ChainShape * c = (b2ChainShape *)shape;
+		const b2Vec2 & v = c->GetVertex(index);
+		return Physics::scaleUp(v);
+	}
+	
+	const b2Vec2 * ChainShape::getVertices() const
+	{
+		b2ChainShape * c = (b2ChainShape *)shape;
+		return c->GetVertices();
+	}
+
+} // box2d
+} // physics
+} // love