android - AndEngine 和 Box2D 中的弹簧墙

Question

我在我的游戏中使用 Box2D，但我希望有一个漂亮的弹簧墙，以便在触摸时推动玩家。它看起来像这样（在 3 帧中）：

问题：如何实施？我可以将墙壁效果附加到动画精灵吗？

Answer 1

答案是：棱柱接头。我将图像分为两部分：静态和动态（移动条）。以下代码用于在我的问题中的图像中创建方向的棱柱关节：

//prismatic joint
    final Sprite springFrameT = new Sprite(pX, pY, mSpringFrameTRegion, getVertexBufferObjectManager());
    final Sprite springBarT = new Sprite(pX, pY + mSpringFrameTRegion.getHeight()-mSpringBarTRegion.getHeight(), 
            mSpringBarTRegion, getVertexBufferObjectManager());        
    mMainScene.attachChild(springFrameT);
    mMainScene.attachChild(springBarT);        
    mMapSprites.add(springFrameT);
    mMapSprites.add(springBarT);

    final Body springFrameBody = PhysicsFactory.createBoxBody(mPhysicsWorld, springFrameT, BodyType.StaticBody, FIXTURE_DEF);
    final Body springBarBody = PhysicsFactory.createBoxBody(mPhysicsWorld, springBarT, BodyType.DynamicBody, SPRING_FIXTURE_DEF);        
    mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(springFrameT, springFrameBody, false, false));
    mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(springBarT, springBarBody, true, true));

    final PrismaticJointDef prismaticJointDef = new PrismaticJointDef();        
    prismaticJointDef.initialize(springFrameBody, springBarBody, springFrameBody.getWorldCenter(), // new Vector2(springFrameT.getWidth(), springFrameT.getHeight()/2), 
            new Vector2(0, 1.0f)); 
    prismaticJointDef.lowerTranslation = -0.5f;
    prismaticJointDef.upperTranslation = 0.5f;
    prismaticJointDef.enableLimit = true;
    prismaticJointDef.enableMotor = true;
    prismaticJointDef.maxMotorForce = 100.0f;
    prismaticJointDef.motorSpeed = 100000f;
    prismaticJointDef.collideConnected = false;
    this.mPhysicsWorld.createJoint(prismaticJointDef);