Added RopeJoint

--HG--
branch : box2d-update

src/modules/physics/box2d/RopeJoint.cpp

@@ -0,0 +1,59 @@
+/**
+* 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 "RopeJoint.h"
+
+// Module
+#include "Body.h"
+#include "World.h"
+
+namespace love
+{
+namespace physics
+{
+namespace box2d
+{
+	RopeJoint::RopeJoint(Body * body1, Body * body2, float x1, float y1, float x2, float y2, float maxLength)
+		: Joint(body1, body2), joint(NULL)
+	{
+		b2RopeJointDef def;
+		def.bodyA = body1->body;
+		def.bodyB = body2->body;
+		def.localAnchorA = world->scaleDown(b2Vec2(x1,y1));
+		def.localAnchorB = world->scaleDown(b2Vec2(x2,y2));
+		def.maxLength = world->scaleDown(maxLength);
+		joint = (b2RopeJoint*)createJoint(&def);
+	}
+
+	RopeJoint::~RopeJoint()
+	{
+		destroyJoint(joint);
+		joint = 0;
+	}
+
+	float RopeJoint::getMaxLength() const
+	{
+		return world->scaleUp(joint->GetMaxLength());
+	}
+
+
+} // box2d
+} // physics
+} // love