使body连续运动

Question

我正在使用Box-2d&和引擎。我有一个动态的身体，比如说一个平面。我想以给定的速度不断地移动它。所以，我设置了一个线性速度。我有屏幕边界（地面，屋顶，左墙和右墙）。那些是静止的身体。当我的飞机与边界碰撞一两次时，它就停止了。我并没有对平面施加重力。为什么飞机虽然有固定的速度却停了下来？问题：碰撞后，如何以连续的速度和相应的方向移动平面？之后我想把它移到用户在屏幕上触摸的地方？

代码：创建平面

FixtureDef FIXTURE_DEF = PhysicsFactory
                .createFixtureDef(1, .5f, 0.5f);
        aPlane = new Plane(222, 333, pilotTexures, vbom) {
            @Override
            protected void onManagedUpdate(float pSecondsElapsed) {
                super.onManagedUpdate(pSecondsElapsed);
            }
        };
        planeBody = PhysicsFactory.createBoxBody(this.mPhysicsWorld, aPlane,
                BodyType.DynamicBody, FIXTURE_DEF);
        mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(
                aPlane, planeBody, true, true));
        planeBody.setLinearVelocity(DEMO_VELOCITY_X, DEMO_VELOCITY_Y);
        attachChild(aPlane);
        planeBody.setGravityScale(0);
        planeBody.setUserData(PLANE);

代码：创建边界墙

final Rectangle ground = new Rectangle(0, camera_Height - 2,
        camera_Width, 2, vbom);
final Rectangle roof = new Rectangle(0, 0, camera_Width, 2, vbom);
final Rectangle left = new Rectangle(0, 0, 2, camera_Height, vbom);
final Rectangle right = new Rectangle(camera_Width - 2, 0, 2,
        camera_Height, vbom);
final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0,
        0.5f, 0.5f);
PhysicsFactory.createBoxBody(this.mPhysicsWorld, ground,
        BodyType.StaticBody, wallFixtureDef);
Body roofBody = PhysicsFactory.createBoxBody(this.mPhysicsWorld, roof,
        BodyType.StaticBody, wallFixtureDef);
roofBody.setUserData(ROOF);
PhysicsFactory.createBoxBody(this.mPhysicsWorld, left,
        BodyType.StaticBody, wallFixtureDef);
PhysicsFactory.createBoxBody(this.mPhysicsWorld, right,
        BodyType.StaticBody, wallFixtureDef);
attachChild(ground);
attachChild(roof);
attachChild(left);
attachChild(right);

我还创建了ContactListener，可以在它们碰撞时侦听。为了在手指接触点上移动，我还实现了IOnSceneTouchListener

提前感谢。

Answer 1

你能试着把墙壁的弹性设置为1.0f吗？为了经常接触，可以去除摩擦，

final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0,
    0.5f, 0.0f);

收件人，

final FixtureDef wallFixtureDef = PhysicsFactory.createFixtureDef(0,
    1.0f, 0.0f);

跳这个有帮助。