Android游戏：从一组图像一次拖拽一个图像到屏幕

我有5个图像堆积在屏幕的底部。我的游戏的目标是拖动这些图像，并将它们连接在一定条件下（排序拼图）我用下面的代码Android游戏：从一组图像一次拖拽一个图像到屏幕

var touchListener = new CCEventListenerTouchAllAtOnce(); 
touchListener.OnTouchesEnded = OnTouchesEnded; 
touchListener.OnTouchesMoved = HandleTouchesMoved; 
AddEventListener (touchListener, this); 
void HandleTouchesMoved (List touches, CCEvent touchEvent) 
{ 
    foreach(var tap in touches) 
    { 
     var locationOnScreen = tap.Location; 
     alarmicSprite.PositionY = locationOnScreen.Y; 
     alarmicSprite.PositionX = locationOnScreen.X; 
     pressSwitchSprite.PositionY = locationOnScreen.Y; 
     pressSwitchSprite.PositionX = locationOnScreen.X; 
    } 
}

该代码同时将所有图像到触摸的坐标。我的要求是一次只能拖动一个图像，而不是一次拖动一次。我脑海中Xamarin和Github给出的Cocossharp API和教程并不是那么有用。有没有一种方法可以在一个触摸实例上拖动一个图像？帮助赞赏

来源

2015-10-16 Binoy

当你说 “堆叠”，是否意味着你有精神上的另一个？ – jaybers

这里是一个例子，它创建两个精灵并让你单独拖动它们。

设计：

您需要检测哪个精灵被触摸，然后只能移动精灵。
拯救精灵被触摸的OnTouchesBegan
将当前的触摸精灵在OnTouchesMoved

注意：

的OnTouchesBegan为EVERY精灵，其登记为被调用一次事件。因此，如果20个精灵添加侦听器，则OnTouchesBegan事件被调用20次（除非被吞噬，见下）
以编程方式确定触摸位置是否在调用OnTouchesBegan的精灵的边界框内。然而，“吞咽”触摸将停止任何剩余的排队等待呼叫。要吞咽，只需返回true。

一旦找到感兴趣的精灵，您将返回true以“吞下”触摸事件，并停止其他精灵回拨。这可以节省CPU并更快地执行您的OnTouchesMoved。在完全处理OnTouchesBegan之前，系统不会调用OnTouchesMoved。

CCSprite currentSpriteTouched; 
CCSprite Sprite1; 
CCSprite Sprite2; 
protected override void AddedToScene() 
{ 
    base.AddedToScene(); 

    // Use the bounds to layout the positioning of our drawable assets 
    CCRect bounds = VisibleBoundsWorldspace; 

    Sprite1 = new CCSprite("redball.png"); 
    Sprite2 = new CCSprite("blueball.png"); 

    Sprite1.Position = bounds.Center; 
    Sprite2.Position = bounds.Center; 
    AddChild(Sprite1); 
    AddChild(Sprite2); 

    // Register for touch events 
    var touchListener = new CCEventListenerTouchOneByOne(); 
    touchListener.IsSwallowTouches = true; 
    touchListener.OnTouchBegan = this.OnTouchesBegan; 
    touchListener.OnTouchMoved = this.OnTouchesMoved; 

    AddEventListener(touchListener, Sprite2); 
    AddEventListener(touchListener.Copy(), Sprite1); 

} 


void OnTouchesMoved(CCTouch touch, CCEvent touchEvent) 
{ 
    if (currentSpriteTouched != null) 
    { 
     currentSpriteTouched.Position = touch.Location; 
    } 
} 

bool OnTouchesBegan(CCTouch touch, CCEvent touchEvent) 
{ 
    // This is called once for each sprite 
    // To stop the remaining sprites from calling, 
    // "swallow" the touch by returning true 
    CCSprite caller = touchEvent.CurrentTarget as CCSprite; 
    currentSpriteTouched = null; 
    if (caller == Sprite1) 
    { 
     if (Sprite1.BoundingBoxTransformedToWorld.ContainsPoint(touch.Location)) 
     { 
      System.Diagnostics.Debug.WriteLine("Sprite 1 touched "); 
      currentSpriteTouched = Sprite1; 
      return true; // swallow  
     } 
     else 
     { 
      return false; // do not swallow and try the next caller 
     } 

    } 
    else if (caller == Sprite2) 
    { 
     if (Sprite2.BoundingBoxTransformedToWorld.ContainsPoint(touch.Location)) 
     { 
      currentSpriteTouched = Sprite2; 
      System.Diagnostics.Debug.WriteLine("Sprite 2 touched "); 
      return true; // swallow  
     } 
     else 
     { 
      return false; // do not swallow and try the next caller 
     } 
    } 
    else 
    { 
     // something else touched 
     System.Diagnostics.Debug.WriteLine("Something else was touched"); 
     return false; // Do not swallow 
    } 
}

来源

2015-10-19 05:36:04 jaybers

我跟着这个链接TouchableSpriteTest并取得我需要的功能（从jaybers帮助）

示例代码

protected override void AddedToScene() 
     { 
      -------------------------- 
      -------------------------- 
      // Register for touch events 
     var touchListener = new CCEventListenerTouchOneByOne(); 
     touchListener.IsSwallowTouches = true; 
     touchListener.OnTouchBegan = OnTouchBegan; 
     touchListener.OnTouchEnded = OnTouchesEnded;    
     touchListener.OnTouchMoved = HandleTouchesMoved; 
     batterySprite.AddEventListener (touchListener); 
     pressSwitchSprite.AddEventListener (touchListener.Copy()); 
     wireSprite3.AddEventListener (touchListener.Copy()); 
     lampSprite.AddEventListener (touchListener.Copy()); 
     wireSprite2.AddEventListener (touchListener.Copy()); 
     } 

     bool OnTouchBegan (CCTouch touch, CCEvent touchEvent) 
     {  
      var target = (CCSprite)touchEvent.CurrentTarget; 

      var locationInNode = touch.Location; 
      var s = target.ContentSize; 
      CCRect rect = target.BoundingBoxTransformedToWorld; 

      if (rect.ContainsPoint (locationInNode)) {    
       target.Opacity = 180; 
       return true; 
      } 
      return false; 
     } 

     void HandleTouchesMoved (CCTouch touch, CCEvent touchEvent) 
     {  

      var target = (CCSprite)touchEvent.CurrentTarget; 
      CCPoint pt = touch.PreviousLocation + touch.Delta; 
      target.Position = target.WorldToParentspace (pt); 
     }

来源

2015-10-19 06:21:08 Binoy

Android游戏：从一组图像一次拖拽一个图像到屏幕

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