CircleShape.java

/*******************************************************************************
 * 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;

import com.badlogic.gdx.math.Vector2;

/**
 * A circle shape.
 * 
 * @author mzechner
 */
public class CircleShape extends Shape {
	// @off
	/*JNI
	#include <Box2D/Box2D.h>
	 */

	public CircleShape() {
		addr = newCircleShape();
	}

	private native long newCircleShape(); /*
											return (jlong)(new b2CircleShape( ));
											*/

	protected CircleShape(long addr) {
		this.addr = addr;
	}

	/** {@inheritDoc} */
	@Override
	public Type getType() {
		return Type.Circle;
	}

	/** Returns the position of the shape */
	private final float[] tmp = new float[2];
	private final Vector2 position = new Vector2();

	public Vector2 getPosition() {
		jniGetPosition(addr, tmp);
		position.x = tmp[0];
		position.y = tmp[1];
		return position;
	}

	private native void jniGetPosition(long addr, float[] position); /*
																		b2CircleShape* circle = (b2CircleShape*)addr;
																		position[0] = circle->m_p.x;
																		position[1] = circle->m_p.y;
																		*/

	/** Sets the position of the shape */
	public void setPosition(Vector2 position) {
		jniSetPosition(addr, position.x, position.y);
	}

	private native void jniSetPosition(long addr, float positionX, float positionY); /*
																						b2CircleShape* circle = (b2CircleShape*)addr;
																						circle->m_p.x = positionX;
																						circle->m_p.y = positionY;
																						*/
}