Added Box2D

external/Box2D-2.3.1/Contributions/Enhancements/Controllers/b2ConstantForceController.cpp

@@ -0,0 +1,47 @@
+/*
+* Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
+*
+* 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 "b2ConstantForceController.h"
+
+b2ConstantForceController::b2ConstantForceController(const b2ConstantForceControllerDef* def) : b2Controller(def)
+{
+	F = def->F;
+}
+
+void b2ConstantForceController::Step(const b2TimeStep& step)
+{
+	B2_NOT_USED(step);
+	for(b2ControllerEdge *i=m_bodyList;i;i=i->nextBody){
+		b2Body* body = i->body;
+		if(body->IsSleeping())
+			continue;
+		body->ApplyForce(F,body->GetWorldCenter());
+	}
+}
+
+void b2ConstantForceController::Destroy(b2BlockAllocator* allocator)
+{
+	allocator->Free(this, sizeof(b2ConstantForceController));
+}
+
+
+b2ConstantForceController* b2ConstantForceControllerDef::Create(b2BlockAllocator* allocator) const
+{
+	void* mem = allocator->Allocate(sizeof(b2ConstantForceController));
+	return new (mem) b2ConstantForceController(this);
+}