检测手势是顺时针还是逆时针答案

【问题标题】：Detect whether a gesture was clockwise or anticlockwise检测手势是顺时针还是逆时针
【发布时间】：2013-01-07 12:40:36
【问题描述】：

我在课堂上使用OnGestureListener。我想知道我做的手势是顺时针还是逆时针，并想对这些手势执行不同的任务。 OnGestureListener 是否提供此功能？我该怎么做？

【问题讨论】：

标签： android gesture

【解决方案1】：

看看这个例子是否对你有任何帮助！

http://mobile.tutsplus.com/tutorials/android/android-sdk-creating-a-rotating-dialer/

【讨论】：

不，我不明白，我正在寻找 vecotr 乘法逻辑来检测 claock 明智或反时钟明智的逻辑

【解决方案2】：

 if(prediction.size() > 0){
  String gesturePerformed = prediction.get(0).name;
  if(gesturePerformed.equals("up")){
   myForeground.canvasUp();
   Toast.makeText(MyGameActivity.this,
     "up", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("down")){
   myForeground.canvasDown();
   Toast.makeText(MyGameActivity.this,
     "down", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("left")){
   myForeground.canvasLeft();
   Toast.makeText(MyGameActivity.this,
     "left", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("right")){
   myForeground.canvasRight();
   Toast.makeText(MyGameActivity.this,
     "right", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("clockwise")){
   myForeground.canvasClockwise();
   Toast.makeText(MyGameActivity.this,
     "clockwise", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("anti-clockwise")){
   myForeground.canvasAntiClockwise();
   Toast.makeText(MyGameActivity.this,
     "anti-clockwise", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("enlarge")){
   myForeground.canvasEnlarge();
   Toast.makeText(MyGameActivity.this,
     "enlarge", Toast.LENGTH_LONG).show();
  }else if(gesturePerformed.equals("reduce")){
   myForeground.canvasReduce();
   Toast.makeText(MyGameActivity.this,
     "reduce", Toast.LENGTH_LONG).show();
  }
 }

}

来源：http://android-coding.blogspot.in/2012/03/gestures-detection-and-canvas-scale.html

【讨论】：

不，我不明白，我正在寻找 vecotr 乘法逻辑来检测 claock 明智或反时钟明智的逻辑