Added Box2D

external/Box2D-2.3.1/Contributions/Enhancements/Controllers/b2BuoyancyController.h

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+/*
+* Copyright (c) 2006-2009 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.
+*/
+
+#ifndef B2_BUOYANCYCONTROLLER_H
+#define B2_BUOYANCYCONTROLLER_H
+
+#include "b2Controller.h"
+
+class b2BuoyancyControllerDef;
+
+/// Calculates buoyancy forces for fluids in the form of a half plane.
+class b2BuoyancyController : public b2Controller{
+public:
+	/// The outer surface normal
+	b2Vec2 normal;
+	/// The height of the fluid surface along the normal
+	float32 offset;
+	/// The fluid density
+	float32 density;
+	/// Fluid velocity, for drag calculations
+	b2Vec2 velocity;
+	/// Linear drag co-efficient
+	float32 linearDrag;
+	/// Linear drag co-efficient
+	float32 angularDrag;
+	/// If false, bodies are assumed to be uniformly dense, otherwise use the shapes densities
+	bool useDensity; //False by default to prevent a gotcha
+	/// If true, gravity is taken from the world instead of the gravity parameter.
+	bool useWorldGravity;
+	/// Gravity vector, if the world's gravity is not used
+	b2Vec2 gravity;
+
+	/// @see b2Controller::Step
+	void Step(const b2TimeStep& step);
+
+	/// @see b2Controller::Draw
+	void Draw(b2DebugDraw *debugDraw);
+
+protected:
+	void Destroy(b2BlockAllocator* allocator);
+
+private:
+	friend class b2BuoyancyControllerDef;
+	b2BuoyancyController(const b2BuoyancyControllerDef* def);
+};
+
+/// This class is used to build buoyancy controllers
+class b2BuoyancyControllerDef : public b2ControllerDef
+{
+public:
+	/// The outer surface normal
+	b2Vec2 normal;
+	/// The height of the fluid surface along the normal
+	float32 offset;
+	/// The fluid density
+	float32 density;
+	/// Fluid velocity, for drag calculations
+	b2Vec2 velocity;
+	/// Linear drag co-efficient
+	float32 linearDrag;
+	/// Linear drag co-efficient
+	float32 angularDrag;
+	/// If false, bodies are assumed to be uniformly dense, otherwise use the shapes densities
+	bool useDensity; //False by default to prevent a gotcha
+	/// If true, gravity is taken from the world instead of the gravity parameter.
+	bool useWorldGravity;
+	/// Gravity vector, if the world's gravity is not used
+	b2Vec2 gravity;
+
+	b2BuoyancyControllerDef():
+		normal(0,1),
+		offset(0),
+		density(0),
+		velocity(0,0),
+		linearDrag(0),
+		angularDrag(0),
+		useDensity(false),
+		useWorldGravity(true),
+		gravity(0,0)
+	{
+	}
+
+private:
+	b2BuoyancyController* Create(b2BlockAllocator* allocator) const;
+};
+
+#endif