Box2d中的身體不會移動

Question

我製作了這個可以用來製作敵方蜘蛛的敵人蜘蛛類。這個班級確實創建了蜘蛛，但在我稱之爲移動方法時不會移動......任何想法？我從Map類調用移動方法。正文和精靈被創建，但它再次因爲某種原因不會移動。任何幫助將被認爲。

public SpiderEnemy(World world, float xposition, float yposition) 
{ 
    bdef=new BodyDef(); 
    fdef=new FixtureDef(); 
    shape=new PolygonShape(); 

    xPosition=xposition; 
    yPosition=yposition; 
    texture=new Texture("spider.png"); 
    textureRegion=new TextureRegion[1]; 
    textureRegion[0]=new TextureRegion(texture,55,55,60,60); 
    HP=20; 
    HitDmg=10; 
    body=createBody(world); 
} 

public Body createBody(World world) 
{ 
    bdef.type=BodyDef.BodyType.KinematicBody; 
    bdef.position.set(xPosition+.5f,yPosition+.5f); 
    body=world.createBody(bdef); 
    shape.setAsBox(textureRegion[0].getRegionWidth()/Mango.PPM/10f,textureRegion[0].getRegionHeight()/Mango.PPM/10f); 
    fdef.shape=shape; 
    fdef.density=0; 
    body.createFixture(fdef); 
    fdef.filter.categoryBits=4; 
    circle=new CircleShape(); 
    fdef.shape=circle; 
    circle.setRadius(0.5f); 
    fdef.isSensor=true; 
    body.createFixture(fdef).setUserData("SpiderSensor"); 
    return body; 
} 

public void moveUp() 
{ 
    body.applyLinearImpulse(new Vector2(0,speed), body.getWorldCenter(), true); 
} 

public void moveDown() 
{ 
    System.out.println("MOVE"); 
    body.applyLinearImpulse(new Vector2(0,-speed), body.getWorldCenter(), true); 
} 

public void moveForward() 
{ 
    body.applyLinearImpulse(new Vector2(speed,0), body.getWorldCenter(), true); 
} 

public void moveBack() 
{ 
    body.applyLinearImpulse(new Vector2(-speed,0), body.getWorldCenter(), true); 
} 

public void stopMoving() 
{ 
    body.setLinearVelocity(0, 0); 
} 

public float GetHitDmg() 
{ 
    return HitDmg; 
} 

public void calculateHealth(float Dmg) 
{ 
    HP=HP-Dmg; 
} 

public float getHP() 
{ 
    return HP; 
} 

public void killed() 
{ 
    for(int i=0;i<textureRegion.length;i++) 
    { 
     textureRegion[i]=null; 
    } 
    fdef.isSensor=false; 
} 

public void killSpider(World world) 
{ 
    world.destroyBody(body); 
} 


public void draw(SpriteBatch batch) 
{ 
    if(textureRegion[0]!=null) 
    { 
     batch.draw(textureRegion[0], xPosition, yPosition,texture.getWidth()/Mango.PPM/2,texture.getHeight()/Mango.PPM/2); 
    } 
} 

Answer 1

不使用body.applyLinearImpulse(new Vector2(-speed,0), body.getWorldCenter(), true);

使用body.setLinearVelocity(0, -speed);