多点触摸的一些代码

注： 该段代码只是我处理多点触摸时的一小部分，其中还有错误，后面已经修改掉了。

把这些放在这里，只是为了做一个纪念。 

public boolean onTouchEvent(MotionEvent event) {
ispointer = true;

int action = event.getAction() & MotionEvent.ACTION_MASK;
if(action == MotionEvent.ACTION_DOWN)
{
int px = (int) event.getX(0);
int py = (int) event.getY(0);
GCanvas.pointerPressedX = px;
GCanvas.pointerPressedY = py;
}
else if(action == MotionEvent.ACTION_UP)
{
GCanvas.resetPointer();
}


//不是游戏阶段的话，用Engine的相关方法处理。
if(GCanvas.state != C.STATE_GAME)
{
Engine.mouseEvents.add(event);
return true;
}

//小游戏
if(Engine.game == null || Engine.game.isClassicGame() == false)
{
return false;
}


//游戏阶段处理。。 特殊处理：

switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
this.pointerPressed(event, 0);
break;
case MotionEvent.ACTION_UP:
this.pointerReleased(event);
break;
case MotionEvent.ACTION_MOVE:
this.pointerDragged((int) event.getX(), (int) event.getY());
break;
case MotionEvent.ACTION_POINTER_DOWN:
this.pointerPressed(event, 1);
break;
case MotionEvent.ACTION_POINTER_UP:
this.pointerReleased(event);
break;
}
return true; 
}

private void pointerPressed(MotionEvent event, int index) 
	{
		int px = (int) event.getX(index);
		int py = (int) event.getY(index);
		
		int bid = getBtnId(px, py);
		if (bid != -1) {
			pressId |= (1 << bid);
		}
		pressingId = pressId;
	}

	  private void pointerReleased(MotionEvent event)
	  {
		  int index = event.getActionIndex();
		    int px = (int) event.getX(index);
			int py = (int) event.getY(index);
			
			
			int bid = getBtnId(px, py);
			if(bid != -1)
			{
				releaseId |= (1 << bid);
				pressingId &= ~(1 << bid);
			}
		  
		  //如果点到的不是按钮区 --- 
		  if(releaseId == 0)
		  {
			  pressingId = 0;
			  GCanvas.keyKeptPressed = 0;
		  }
		
	  }
	  
	  
	  protected void pointerDragged(int px, int py)
	  {
			if (state != C.STATE_GAME || Engine.isUseGesture == false) {
				return;
			}
			int bid = getBtnId(px, py);
			if ((1 << bid) != pressingId) {
				pressingId = 0;
				GCanvas.keyKeptPressed = 0;
			}
	  }