android - 如何使用 onTouchListener 拖放 body 并仍在 PhysicsWorld 中？和引擎

Question

我想使用触摸拖放主体及其 Sprite 。我确实知道如何拖放 Sprite ，但是当我尝试移动 body 时它...不起作用， body 保持静止。更重要的是，有时当我触摸 body 时，整个应用程序都会崩溃 :x谁能告诉我如何拖放手指移动时与其他物体碰撞的物理物体？我一直在寻找 3 天，我很沮丧:[

我创建了 3 个相似的实体。一种是动态的(模拟曲棍球比赛中的球弹跳)，两种是运动的(玩家可以移动)。我将向您展示我要移动的 body 的声明。我不知道是否需要任何代码来向您展示，但我实现了一些在非常糟糕的教程中找到的接口(interface)。 :s

public class MainActivity extends SimpleBaseGameActivity implements IOnSceneTouchListener, IOnAreaTouchListener

声明:

//Declaration:
         final Sprite face = new Sprite(CAMERA_WIDTH/2+200f, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager()) {
            @Override
            public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
                this.setPosition(pSceneTouchEvent.getX() - this.getWidth() / 2, pSceneTouchEvent.getY() - this.getHeight() / 2);
                return true;
            }
        };
        final FixtureDef MyFixtureDef = PhysicsFactory.createFixtureDef(0.2f,0.4f,0.6f);

        this.scene.registerUpdateHandler(this.mPhysicsWorld);
        face.setScale(3);

正文:

final Body facebody = PhysicsFactory.createCircleBody(
        this.mPhysicsWorld, face, BodyType.KinematicBody,
        CIRCLE_FIXTURE_DEF);
    this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(face,
        facebody, true, true));
    facebody.setUserData("player1");

方法:

我尝试了 MouseJoint

  public MouseJoint createMouseJoint(IAreaShape face, float x, float y) {
final Body boxBody = this.mPhysicsWorld.getPhysicsConnectorManager()
    .findBodyByShape(face);

Vector2 v = boxBody.getWorldPoint(new Vector2(x / 32, y / 32));

MouseJointDef mjd = new MouseJointDef();
// mjd.bodyA = ballbody;
mjd.bodyB = boxBody;
mjd.dampingRatio = 0.2f;
mjd.frequencyHz = 30;
mjd.maxForce = (float) (200.0f * boxBody.getMass());
mjd.collideConnected = true;
mjd.target.set(v);
return (MouseJoint) this.mPhysicsWorld.createJoint(mjd);
}

也不是 onAreaTouched 吗？

@Override
public boolean onAreaTouched(final TouchEvent pSceneTouchEvent, final ITouchArea pTouchArea, final float pTouchAreaLocalX, final float pTouchAreaLocalY) {
    if(pSceneTouchEvent.isActionDown()) {
        final IAreaShape face = (IAreaShape) pTouchArea;
        if(this.mMouseJointActive == null) {
            //this.mEngine.vibrate(100);
            this.mMouseJointActive = this.createMouseJoint(face, pTouchAreaLocalX, pTouchAreaLocalY);
        }
        return true;
    }
    return false;
}

这里只是猜测

        @Override
        public boolean onSceneTouchEvent(Scene pScene, TouchEvent pSceneTouchEvent) {
            // TODO Auto-generated method stub
            if(pSceneTouchEvent.isActionDown()) {
                Debug.d("here!");
return true;
            }
            return false;
        }

    }

关于类的问题:

如果我在 MainActivity 中声明类玩家:

 class Player {
final Body facebody;
final Sprite face = new Sprite(MainActivity.CAMERA_WIDTH / 2+200f,240, MainActivity.mFaceTextureRegion ,getVertexBufferObjectManager()) {
        @Override
        public boolean onAreaTouched(final TouchEvent pSceneTouchEvent,
            final float pTouchAreaLocalX, final float pTouchAreaLocalY) {

        switch (pSceneTouchEvent.getAction()) {
        case TouchEvent.ACTION_MOVE:
            // Here 'body' refers to the Body object associated with
            // this sprite
            facebody.setTransform(pSceneTouchEvent.getX(),
                pSceneTouchEvent.getY(), facebody.getAngle());
            break;
        default:
            break;
        }
        return true;
        }
    };

    Player(Body f) {
        facebody = f;
    }

    }

一切都很完美，但是，它大喊着 player.face can't be declared in此声明中的 OnCreateScene:

final Player player= new Player( PhysicsFactory.createCircleBody(   this.mPhysicsWorld, player.face, BodyType.KinematicBody,CIRCLE_FIXTURE_DEF));

我该如何解决？

Answer 1

好吧，我终于找到了好的解决方案把它带到 onCreateScene:

        final AnimatedSprite face;
    final Body body;

    final FixtureDef objectFixtureDef = PhysicsFactory.createFixtureDef(1, 0.5f, 0.5f);


        face = new AnimatedSprite(CAMERA_WIDTH/2+200, CAMERA_HEIGHT/2, this.mCircleFaceTextureRegion, this.getVertexBufferObjectManager());
        face.setScale(3);
        body = PhysicsFactory.createCircleBody(this.mPhysicsWorld, face, BodyType.DynamicBody, objectFixtureDef);

    this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(face, body, true, true));
    face.animate(new long[]{200,200}, 0, 1, true);
    face.setUserData(body);
    body.setUserData("player");
    this.mScene.registerTouchArea(face);
    this.mScene.attachChild(face);

在 AreaTouched 上:

    @Override
public boolean onAreaTouched( final TouchEvent pSceneTouchEvent, final ITouchArea pTouchArea,final float pTouchAreaLocalX, final float pTouchAreaLocalY) {

    if(pSceneTouchEvent.isActionMove()) {

        final AnimatedSprite face = (AnimatedSprite) pTouchArea;
        final Body faceBody = (Body)face.getUserData();
        faceBody.setTransform(pSceneTouchEvent.getX() / PhysicsConstants.PIXEL_TO_METER_RATIO_DEFAULT, pSceneTouchEvent.getY() / PhysicsConstants.PIXEL_TO_METER_RATIO_DEFAULT, faceBody.getAngle());
        return true;
    }
    return false;
}

我没有做class player，我拿来onCreateScene。拖放的重要部分是通过 PhysicsConstants.PIXEL_TO_METER_RATIO_DEFAULT 来划分 X 和 Y。