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我正在使用 Cocos2d-android 游戏引擎开发 android 游戏应用程序，在我的游戏中有一个大炮，当玩家点击游戏层“射弹”时会开火，但根据我的要求，当点击大炮“射弹”的尖端时应该出来，这可以通过使用大炮的设置来完成，但是这里的大炮是可旋转的，所以在给出设置位置时卡住了。这是代码

public class GameL extends CCLayer{

protected LinkedList<CCSprite> _targets;
protected LinkedList<CCSprite> _projectiles;
protected int _projectilesDestroyed;
protected CCSprite _player;
protected CCSprite _nextProjectile;

public static CCScene scene()
{
    CCScene scene = CCScene.node();
    CCLayer layer = new GameL();

    scene.addChild(layer);  

    return scene;     
}


protected GameL()
{
  this.setIsTouchEnabled(true);

    _targets = new LinkedList<CCSprite>();
    _projectiles = new LinkedList<CCSprite>();
    _projectilesDestroyed = 0;

    CCSprite background = CCSprite.sprite("bg.png");
    background.setTag(1);
    background.setAnchorPoint(0, 0);
    addChild(background);

    Context context = CCDirector.sharedDirector().getActivity();

    CGSize winSize = CCDirector.sharedDirector().displaySize();
 _player = CCSprite.sprite("gun2.png");
_player.setPosition(CGPoint.ccp(65,120));
 // _player.setPosition(CGPoint.ccp(_player.getContentSize().width/2.0f, winSize.height/2.0f));
     addChild(_player);

    this.schedule("gameLogic", 1.0f);
    this.schedule("update");
 }


@Override
public boolean ccTouchesEnded(MotionEvent event)
{
    // Choose one of the touches to work with
    CGPoint location = CCDirector.sharedDirector().convertToGL(CGPoint.ccp(event.getX(), event.getY()));

    // Set up initial location of projectile
    CGSize winSize = CCDirector.sharedDirector().displaySize();
CCSprite _nextProjectile = CCSprite.sprite("firebl.png");  

    //_nextProjectile.setPosition(20, winSize.height / 2.0f);
_nextProjectile.setPosition(CGPoint.ccp(65, 120));

    // Determine offset of location to projectile
    int offX = (int)(location.x - _nextProjectile.getPosition().x);
    int offY = (int)(location.y - _nextProjectile.getPosition().y);

    // Bail out if we are shooting down or backwards
    if (offX <= 0)
        return true;

    _nextProjectile.setTag(2);

    // Determine where we wish to shoot the projectile to
    int realX = (int)(winSize.width + (_nextProjectile.getContentSize().width / 2.0f));
    float ratio = (float)offY / (float)offX;
    int realY = (int)((realX * ratio) + _nextProjectile.getPosition().y);
    CGPoint realDest = CGPoint.ccp(realX, realY);

    // Determine the length of how far we're shooting
    int offRealX = (int)(realX - _nextProjectile.getPosition().x);
    int offRealY = (int)(realY - _nextProjectile.getPosition().y);
    float length = FloatMath.sqrt((offRealX * offRealX) + (offRealY * offRealY));
    float velocity = 480.0f / 1.0f; // 480 pixels / 1 sec
    float realMoveDuration = length / velocity;

    // Move projectile to actual endpoint
    _nextProjectile.runAction(CCSequence.actions(
            CCMoveTo.action(realMoveDuration, realDest),
            CCCallFuncN.action(this, "spriteMoveFinished")));

    // Determine angle to face
    double angleRadians = Math.atan((double)offRealY / (double)offRealX);
    double angleDegrees = Math.toDegrees(angleRadians);
    double cocosAngle = -1 * angleDegrees;
    double rotationSpeed = 0.5 / Math.PI;
    double rotationDuration = Math.abs(angleRadians * rotationSpeed);
    _player.runAction(CCSequence.actions(
            CCRotateTo.action((float)rotationDuration, (float)cocosAngle),
            CCCallFunc.action(this, "finishShoot")));

    // Pew!
    Context context = CCDirector.sharedDirector().getActivity();
    SoundEngine.sharedEngine().playEffect(context, R.raw.pew_pew_lei);

    return true;
}  

public void finishShoot()
{
    addChild(_nextProjectile);
    _projectiles.add(_nextProjectile);
}

public void gameLogic(float dt)  
{
    addTarget();
}

public void update(float dt)
{
    LinkedList<CCSprite> projectilesToDelete = new LinkedList<CCSprite>();

    for (CCSprite projectile : _projectiles)
    {
        CGRect projectileRect = CGRect.make(projectile.getPosition().x - (projectile.getContentSize().width / 2.0f),
                                            projectile.getPosition().y - (projectile.getContentSize().height / 2.0f),
                                            projectile.getContentSize().width,
                                            projectile.getContentSize().height);

        LinkedList<CCSprite> targetsToDelete = new LinkedList<CCSprite>();

        for (CCSprite target : _targets)
        {
            CGRect targetRect = CGRect.make(target.getPosition().x - (target.getContentSize().width),
                                            target.getPosition().y - (target.getContentSize().height),
                                            target.getContentSize().width,
                                            target.getContentSize().height);

            if (CGRect.intersects(projectileRect, targetRect))
                targetsToDelete.add(target);
        }

        for (CCSprite target : targetsToDelete)
        {
            _targets.remove(target);
            removeChild(target, true);
        }

        if (targetsToDelete.size() > 0)
            projectilesToDelete.add(projectile);
    }

    for (CCSprite projectile : projectilesToDelete)
    {
        _projectiles.remove(projectile);
        removeChild(projectile, true);

        if (++_projectilesDestroyed > 30)
        {
            _projectilesDestroyed = 0;
            CCDirector.sharedDirector().replaceScene(Gameoverlayer.scene("You Win!"));
        }
    }
}
4

2 回答 2

1

老实说，我从来没有使用过 Cocos2d-android 游戏引擎，但我希望我能提供一些帮助。

起初你在评论中说的是：你触摸屏幕上的任何地方然后大炮开火，但你想要的只是在大炮被触摸时才发射弹丸。

每次触摸屏幕时都会调用public boolean ccTouchesEnded(MotionEvent event)。如果您在 ccTouchesEnded 函数的顶部添加一个 if 语句来检查触摸是否在放置大炮的范围内，它可能会起到作用。屏幕被触摸的坐标大概在函数提供的 MotionEvent 对象中。

所以下面的伪代码可能会起作用：

注意：我假设图像的坐标是左下角

public boolean ccTouchesEnded(MotionEvent event)
{
    if(event.isTouchedOnX() < CannonX 
    || event.isTouchedOnX() > CannonX + horizontalSizeOfCannonImage
    || event.isTouchedOnY() < CannonY 
    || event.isTouchedOnY() > CannonY + verticalsizeOfCannonImage)
    {
        // Don't do a thing and see the event as processed
        return true; // You might want to check what the boolean returning the function really means but it might presumably mean that the event does not need further processing by the window.
    }

    ... The rest of the code.
}

我真的希望这会对你有所帮助！

基督教

于 2013-05-07T18:13:23.423 回答
1

可能你必须添加佳能精灵的条件和触摸位置用 touchBegan 替换下面的代码

    public boolean ccTouchesBegan(MotionEvent event)
    {
       CGPoint location = CCDirector.sharedDirector().convertToGL(CGPoint.ccp(event.getX(), event.getY()));

        // Set up initial location of projectile
        CGSize winSize = CCDirector.sharedDirector().displaySize();
        _nextProjectile = CCSprite.sprite("fireball50.png");

        // _nextProjectile.setPosition(20, winSize.height / 2.0f);
        _nextProjectile.setPosition(CGPoint.ccp(65, 120));


        for (CCSprite target : targets)
            {

                if (CGRect.containsPoint((target.getBoundingBox()), location))
                    {

                        // Determine offset of location to projectile
                        int offX = (int) (location.x - _nextProjectile.getPosition().x);
                        int offY = (int) (location.y - _nextProjectile.getPosition().y);

                        // Bail out if we are shooting down or backwards

                        _nextProjectile.setTag(3);   
                        // Determine where we wish to shoot the projectile
                        // to
                        int realX = (int) (winSize.width + (_nextProjectile.getContentSize().width / 2.0f));
                        float ratio = (float) offY / (float) offX;
                        int realY = (int) ((realX * ratio) + _nextProjectile.getPosition().y);
                        CGPoint realDest = CGPoint.ccp(realX, realY);

                        // Determine the length of how far we're shooting
                        int offRealX = (int) (realX - _nextProjectile.getPosition().x);
                        int offRealY = (int) (realY - _nextProjectile.getPosition().y);
                        float length = FloatMath.sqrt((offRealX * offRealX) + (offRealY * offRealY));
                        float velocity = 480.0f / 1.0f; // 480 pixels / 1
                                                        // sec
                        float realMoveDuration = length / velocity;
                        System.out.println(" - t tag!!!!!!!!!!!!!!!!!!!!! - ");
                        _nextProjectile.runAction(CCSequence.actions(CCMoveTo.action(realMoveDuration, realDest),
                                CCCallFuncN.action(this, "spriteMoveFinished")));
                        double angleRadians = Math.atan((double) offRealY / (double) offRealX);
                        double angleDegrees = Math.toDegrees(angleRadians);
                        double cocosAngle = -1 * angleDegrees;
                        double rotationSpeed = 0.5 / Math.PI;
                        double rotationDuration = Math.abs(angleRadians * rotationSpeed);

                        target.runAction(CCSequence.actions(
                                CCRotateTo.action((float) rotationDuration, (float) cocosAngle),
                                CCCallFunc.action(this, "finishShoot")));
                        break;
                    }
            }


        return true;
    }
于 2013-07-16T08:55:08.157 回答