Box2D Корпус не отображается и не разбивается

Question

Я просто пытаюсь отобразить тело Box2D на экране.

Вот мой основной код класса:

public class Core extends ApplicationAdapter { 

private World world; 
private Box2DDebugRenderer rend; 
EntityParent p; 
private OrthographicCamera cam; 
@Override 
public void create() { 

    cam = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight()); 
    cam.setToOrtho(false); 
    cam.viewportWidth = 640; 
    cam.viewportHeight = 480; 
    world = new World(new Vector2(0, -9.81f), true); 

    rend = new Box2DDebugRenderer(); 


    p = new EntityParent(world, new Vector2(100, 100), BodyType.DynamicBody); 
    p.initBodyVariables(1, 1, 1); 
    p.createCircle(50); 
} 


@Override 
public void render() { 
    cam.update(); 
    world.step(1/60f, 6, 2); 
    System.out.println(p.getPosition()); 

    Gdx.gl.glClearColor(0, 0, 0, 1); 
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 

    rend.render(world, cam.combined); 

} 

}

И это кодEntityParent:

package com.reality.entity; 

import com.badlogic.gdx.math.Vector2; 
import com.badlogic.gdx.physics.box2d.Body; 
import com.badlogic.gdx.physics.box2d.BodyDef; 
import com.badlogic.gdx.physics.box2d.BodyDef.BodyType; 
import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 
import com.badlogic.gdx.physics.box2d.Fixture; 
import com.badlogic.gdx.physics.box2d.FixtureDef; 
import com.badlogic.gdx.physics.box2d.PolygonShape; 
import com.badlogic.gdx.physics.box2d.World; 

public class EntityParent implements Entity{ 

/* 
* Used for initializing the body 
*/ 
protected Vector2 position; 
protected World world; 

/* 
* All definitions for creating the body 
*/ 
protected BodyType type; 
protected BodyDef bodyDef; 
protected Body body; 
protected FixtureDef fixtureDef; 
protected Fixture fixture; 

protected float density, friction, restitution; 

/** 
* Puts body by default at (0,0) 
* @param world 
* @param type 
*/ 
public EntityParent(World world, BodyType type){ 
    this.world = world; 
    this.type = type; 
    this.position = new Vector2(0, 0); 

} 
/** 
* 
* @param world 
* @param position of body 
* @param type 
*/ 
public EntityParent(World world, Vector2 position, BodyType type){ 
    this.world = world; 
    this.position = position; 
    this.type = type; 
} 


/** 
* 
* @param world 
* @param x position of body 
* @param y position of body 
* @param type 
*/ 
public EntityParent(World world, float x, float y, BodyType type){ 
    this.world = world; 
    this.position = new Vector2(x, y); 
    this.type = type; 
} 

public void initBodyVariables(float density, float friction, float restitution){ 
    this.density = density; 
    this.friction = friction; 
    this.restitution = restitution; 
} 


@Override 
public void createPolygonBody(float[] vertices) { 

    bodyDef = new BodyDef(); 
    bodyDef.type = type; 
    bodyDef.position.set(position); 

    body = world.createBody(bodyDef); 

    PolygonShape shape = new PolygonShape(); 
    shape.set(vertices); 

    fixtureDef = new FixtureDef(); 
    fixtureDef.shape = shape; 
    fixtureDef.density = density; 
    fixtureDef.friction = friction; 
    fixtureDef.restitution = restitution; 

    fixture = body.createFixture(fixtureDef); 
    shape.dispose(); 

} 

@Override 
public void createRectangle(Vector2 dimensions) { 

    bodyDef = new BodyDef(); 
    bodyDef.type = type; 
    bodyDef.position.set(position); 

    body = world.createBody(bodyDef); 

    PolygonShape shape = new PolygonShape(); 
    shape.setAsBox(dimensions.x, dimensions.y); 

    fixtureDef = new FixtureDef(); 
    fixtureDef.shape = shape; 
    fixtureDef.density = density; 
    fixtureDef.friction = friction; 
    fixtureDef.restitution = restitution; 

    fixture = body.createFixture(fixtureDef); 
    shape.dispose(); 
} 

@Override 
public void createCircle(float radius) { 
    bodyDef = new BodyDef(); 
    bodyDef.type = type; 
    bodyDef.position.set(position); 

    body = world.createBody(bodyDef); 

    PolygonShape shape = new PolygonShape(); 
    shape.setRadius(radius); 

    fixtureDef = new FixtureDef(); 
    fixtureDef.shape = shape; 
    fixtureDef.density = density; 
    fixtureDef.friction = friction; 
    fixtureDef.restitution = restitution; 

    fixture = body.createFixture(fixtureDef); 
    shape.dispose(); 
} 

@Override 
public void update() { 

} 

@Override 
public void render(Box2DDebugRenderer renderer) { 

} 




@Override 
public Vector2 getPosition() { 
    return this.position; 
} 

}

Так ж шляпа происходит, когда я запускаю это я получаю следующее сообщение об ошибке:

AL lib: (EE) alc_cleanup: 1 device not closed 
Assertion failed! 

Program: C:\Program Files\Java\jre1.8.0_60\bin\javaw.exe 
File: /var/lib/jenkins/workspace/libgdx/extensions/gdx-box2d/gdx-box2d/jni/Box2D/Collision/Shapes/b2PolygonShape.cpp, Line 384 

Expression: m_count >= 3 

Если я избавлюсь от заявления от базового класса p.initBodyVariables (1, 1, 1);

Я просто получаю пустой экран.

Я тестировал, был ли это мир, и мир сказал, что в нем есть одно тело, поэтому он регистрируется, но я просто не понимаю, почему он выбрасывает эту ошибку, а не делает вообще. Любая помощь очень благодарна спасибо!

Answer 1

Вы используете неправильный тип формы - PolygonShape вместо CircleShape при создании кругов:

@Override 
    public void createCircle(float radius) { 
     bodyDef = new BodyDef(); 
     bodyDef.type = type; 
     bodyDef.position.set(position); 

     body = world.createBody(bodyDef); 

     PolygonShape shape = new PolygonShape(); //here it should be CircleShape 
     shape.setRadius(radius); 

Оно должно быть:

 CircleShape shape = new CircleShape();