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License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.//from w w  w.j  a v  a2 s  .  c om
 * 
 * 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 {
    /*
     * 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
                                                                                      * ;
                                                                                      */
}

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