/**
* Copyright (c) 2006-2012 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.
**/

#ifndef LOVE_PHYSICS_BOX2D_WHEEL_JOINT_H
#define LOVE_PHYSICS_BOX2D_WHEEL_JOINT_H

// Module
#include "Joint.h"

namespace love
{
namespace physics
{
namespace box2d
{
	/**
	* WheelJoints provide two degrees of freedom: translation
	* along a defined axis and rotation in the plane. Designed
	* for vehicle suspensions.
	**/
	class WheelJoint : public Joint
	{
	private:

		// The Box2D wheel joint object.
		b2WheelJoint * joint;

	public:

		/**
		* Creates a new WheelJoint connecting body1 and body2.
		**/
		WheelJoint(Body * body1, Body * body2, float xA, float yA, float xB, float yB, float ax, float ay, bool collideConnected);

		virtual ~WheelJoint();

		/**
		* Get the current joint translation, usually in meters.
		**/
		float getJointTranslation() const;

		/**
		* Get the current joint translation speed, usually in meters per second.
		**/
		float getJointSpeed() const;

		/**
		* Enable/disable the joint motor.
		**/
		void enableMotor(bool motor);

		/**
		* Checks whether the motor is enabled.
		**/
		bool isMotorEnabled() const;

		/**
		* Set the motor speed, usually in meters per second.
		**/
		void setMotorSpeed(float speed);

		/**
		* Get the motor speed, usually in meters per second.
		**/
		float getMotorSpeed() const;

		/**
		* Set the maximum motor torque, usually in N.
		**/
		void setMaxMotorTorque(float torque);

		/**
		* Get the maximum motor torque, usually in N.
		**/
		float getMaxMotorTorque() const;

		/**
		* Get the current motor torque, usually in N.
		* @param inv_dt The inverse time step.
		**/
		float getMotorTorque(float inv_dt) const;

		/**
		* Set the spring frequency, in hertz. Setting the frequency to 0
		* disables the spring.
		**/
		void setSpringFrequency(float hz);

		/**
		* Get the spring frequency, in hertz.
		**/
		float getSpringFrequency() const;

		/**
		* Set the spring damping ratio.
		**/
		void setSpringDampingRatio(float ratio);

		/**
		* Get the spring damping ratio.
		**/
		float getSpringDampingRatio() const;

	};

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

#endif // LOVE_PHYSICS_BOX2D_WHEEL_JOINT_H