Unity UI 识别画圆手势

　　最近做了一个项目，需要打开一个编辑UI，平时不显示，如果在UI界面上做一个按钮，感觉很丑，就想到了Reporter_Logs的画圆触发。

　　识别到你在界面上画了一个圆 （可用于 Windows 和 Android） 代码如下：

bool isGestureDone()
	{
		if (Application.platform == RuntimePlatform.Android ||
			Application.platform == RuntimePlatform.IPhonePlayer)
		{
			if (Input.touches.Length != 1)
			{
				gestureDetector.Clear();
				gestureCount = 0;
			}
			else
			{
				if (Input.touches[0].phase == TouchPhase.Canceled || Input.touches[0].phase == TouchPhase.Ended)
					gestureDetector.Clear();
				else if (Input.touches[0].phase == TouchPhase.Moved)
				{
					Vector2 p = Input.touches[0].position;
					if (gestureDetector.Count == 0 || (p - gestureDetector[gestureDetector.Count - 1]).magnitude > 10)
						gestureDetector.Add(p);
				}
			}
		}
		else
		{
			if (Input.GetMouseButtonUp(0))
			{
				gestureDetector.Clear();
				gestureCount = 0;
			}
			else
			{
				if (Input.GetMouseButton(0))
				{
					Vector2 p = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
					if (gestureDetector.Count == 0 || (p - gestureDetector[gestureDetector.Count - 1]).magnitude > 10)
						gestureDetector.Add(p);
				}
			}
		}

		if (gestureDetector.Count < 10)
			return false;

		gestureSum = Vector2.zero;
		gestureLength = 0;
		Vector2 prevDelta = Vector2.zero;
		for (int i = 0; i < gestureDetector.Count - 2; i++)
		{

			Vector2 delta = gestureDetector[i + 1] - gestureDetector[i];
			float deltaLength = delta.magnitude;
			gestureSum += delta;
			gestureLength += deltaLength;

			float dot = Vector2.Dot(delta, prevDelta);
			if (dot < 0f)
			{
				gestureDetector.Clear();
				gestureCount = 0;
				return false;
			}

			prevDelta = delta;
		}

		int gestureBase = (Screen.width + Screen.height) / 4;

		if (gestureLength > gestureBase && gestureSum.magnitude < gestureBase / 2)
		{
			gestureDetector.Clear();
			gestureCount++;
			if (gestureCount >= numOfCircleToShow)
				return true;
		}

		return false;
	}