AndEngine如果调用jump方法,如何使sprite不跳转

时间:2011-08-16 23:52:43

标签: java android andengine

所以我有这种方法,当我触摸屏幕时,我的精灵会跳。现在的问题是,当我不断触摸屏幕时,精灵会一次又一次地跳跃。我想要做的是,如果它跳转,除非我的精灵击中地面,否则无法调用跳转方法。

这是代码。

public class PhyiscsActivity extends BaseGameActivity implements IAccelerometerListener, IOnSceneTouchListener{

private static final int CAMERA_WIDTH = 720; private static final int CAMERA_HEIGHT = 480; private Camera mCamera; private BitmapTextureAtlas mBitmapTextureAtlas; private TiledTextureRegion mTextureRegion; private Scene mScene; private FixtureDef mFixtureDef = PhysicsFactory.createFixtureDef(1,-10f, 0.5f); private PhysicsWorld mPhysicsWorld; private Body body; private AnimatedSprite facebox; private FixtureDef wallfixture = PhysicsFactory.createFixtureDef(-1,0.5f, 0.5f); @Override public Engine onLoadEngine() { // TODO Auto-generated method stub this.mCamera = new Camera(0,0,CAMERA_WIDTH, CAMERA_HEIGHT); final EngineOptions mEngineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT),this.mCamera); mEngineOptions.getTouchOptions().setRunOnUpdateThread(true); return new Engine(mEngineOptions); } @Override public void onLoadResources() { // TODO Auto-generated method stub this.mBitmapTextureAtlas = new BitmapTextureAtlas(128,128, TextureOptions.BILINEAR_PREMULTIPLYALPHA); this.mTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mBitmapTextureAtlas, this, "gfx/face_box_tiled.png", 0, 0, 2, 1); this.mEngine.getTextureManager().loadTexture(this.mBitmapTextureAtlas); } @Override public Scene onLoadScene() { // TODO Auto-generated method stub this.mEngine.registerUpdateHandler(new FPSLogger()); this.mScene = new Scene(); this.mScene.setBackground(new ColorBackground(1,1,1)); this.mPhysicsWorld = new PhysicsWorld(new Vector2(0,SensorManager.GRAVITY_EARTH),false); // This is the walls final Shape roof = new Rectangle(0, 0, CAMERA_WIDTH, 2); final Shape ground = new Rectangle(0,CAMERA_HEIGHT - 2,CAMERA_WIDTH,2); final Shape left = new Rectangle(0,0,2,CAMERA_HEIGHT); final Shape right = new Rectangle(CAMERA_WIDTH -2, 0,2,CAMERA_HEIGHT); PhysicsFactory.createBoxBody(this.mPhysicsWorld, ground, BodyType.StaticBody, wallfixture); PhysicsFactory.createBoxBody(this.mPhysicsWorld, roof, BodyType.StaticBody, wallfixture); PhysicsFactory.createBoxBody(this.mPhysicsWorld, left, BodyType.StaticBody, wallfixture); PhysicsFactory.createBoxBody(this.mPhysicsWorld, right, BodyType.StaticBody, wallfixture); // This is the Sprite facebox = new AnimatedSprite(30,(CAMERA_HEIGHT - 2) - this.mTextureRegion.getHeight() ,this.mTextureRegion); body = PhysicsFactory.createBoxBody(this.mPhysicsWorld, facebox, BodyType.DynamicBody, mFixtureDef); this.mScene.attachChild(facebox); this.mScene.registerUpdateHandler(this.mPhysicsWorld); this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(facebox,body,true,true)); this.mScene.setOnSceneTouchListener(this); return this.mScene; } @Override public void onLoadComplete() { // TODO Auto-generated method stub } //Accelerometer @Override public void onAccelerometerChanged(AccelerometerData pAccelerometerData) { // TODO Auto-generated method stub final Vector2 gravity = Vector2Pool.obtain(pAccelerometerData.getX()* 3, 10); this.mPhysicsWorld.setGravity(gravity); Vector2Pool.recycle(gravity); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); this.enableAccelerometerSensor(this); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); this.disableAccelerometerSensor(); } //This is where i make the sprite jump @Override public boolean onSceneTouchEvent(Scene pScene, TouchEvent pSceneTouchEvent) { pSceneTouchEvent.isActionDown();{ this.jump(facebox); } return false; } public void jump(AnimatedSprite sprite){ boolean jumping = false; if(!jumping ){ body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-8f)); } } public void jump(AnimatedSprite sprite){ if(!jumping){ body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-10)); jumping = true; } } @Override public void beginContact(Contact contact) { // TODO Auto-generated method stub jumping = true; } @Override public void endContact(Contact contact) { // TODO Auto-generated method stub jumping = false; }

我不知道为什么beginContact和endContact没有初始化。我应该做些什么来初始化这个?例如更新处理程序? contactlistener?

1 个答案:

答案 0 :(得分:1)

你需要有一种方法告诉你你的球员是否跳跃。

public void jump(AnimatedSprite sprite){

    if( isJumping(sprite)){
        body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-8f));        
        }

在这种方法中,你应该设定计算玩家是否在跳跃的方法。就像他触摸墙一样(如果玩家的身体(x,y)在墙上(矩形))

好的,你使用box2d来制作物理=)

您必须创建一个ContactListener,您必须实现此类以及您要添加的功能。 http://code.google.com/p/andenginephysicsbox2dextension/source/browse/src/com/badlogic/gdx/physics/box2d/ContactListener.java?r=1605f6e82f710ef9ebbe07632d6b055239d3b520

public void beginContact (Contact contact);
public void endContact (Contact contact);

联系人对象将计算您正在触摸的对象(Fixture)。你只需要在身体接触时检查并设置跳跃为假,当你调用跳跃时你可以设置为真,你可以跳跃,设置跳跃为真;

好吗?

@Override
public void beginContact(Contact contact) {
    // TODO Auto-generated method stub
    jumping = true;
}

@Override
public void endContact(Contact contact) {
    // TODO Auto-generated method stub
jumping = false;
}

这是假的..我只会这样想:

@Override
public void beginContact(Contact contact) {
    jumping = false; //you touched ground so you aren't jumping anymore
}

@Override
public void endContact(Contact contact) {
jumping = true; //you leave ground so you're jumping
}

和一种跳跃方法(不是两种):

   public void jump(AnimatedSprite sprite){
        if(!jumping ){
            jumping = true;
            body.setLinearVelocity(new Vector2(body.getLinearVelocity().x,-8f));        
            }
        }

你明白了吗?;