/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.physics.box2d.joints;

import com.badlogic.gdx.physics.box2d.Joint;
import com.badlogic.gdx.physics.box2d.World;

/** A gear joint is used to connect two joints together. Either joint can be a revolute or prismatic joint. You specify a gear
 * ratio to bind the motions together: coordinate1 + ratio * coordinate2 = constant The ratio can be negative or positive. If one
 * joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of
 * 1/length.
 * @warning The revolute and prismatic joints must be attached to fixed bodies (which must be body1 on those joints). */
public class GearJoint extends Joint {
	/*JNI
#include <Box2D/Box2D.h> 
	 */
	
	public GearJoint (World world, long addr) {
		super(world, addr);
	}

	/** Set/Get the gear ratio. */
	public void setRatio (float ratio) {
		jniSetRatio(addr, ratio);
	}

	private native void jniSetRatio (long addr, float ratio); /*
		b2GearJoint* joint =  (b2GearJoint*)addr;
		joint->SetRatio( ratio );
	*/

	/** Set/Get the gear ratio. */
	public float getRatio () {
		return jniGetRatio(addr);
	}

	private native float jniGetRatio (long addr); /*
		b2GearJoint* joint =  (b2GearJoint*)addr;
		return joint->GetRatio();
	*/
}
