using UnityEngine;

namespace TG_TouchGesture
{
	public class TG_TouchGestureZoom : TG_TouchGestureBase
	{
		private const float MIN_RELATIVE_ZOOM_THRESHOLD = 0.1f;

		private float m_lastZoomDist = -1f;

		private bool m_isZooming;

		public TG_TouchGestureZoom()
			: base(TG_ETouchGestureType.ZOOM)
		{
		}

		public override TG_TouchGestureEventArgs Update()
		{
			if (Input.touchCount == 2)
			{
				Touch[] touches = Input.touches;
				float magnitude = (touches[1].position - touches[0].position).magnitude;
				if (m_lastZoomDist == -1f)
				{
					m_lastZoomDist = magnitude;
				}
				else
				{
					float num = Mathf.Min(Screen.width, Screen.height);
					if (Mathf.Abs(magnitude - m_lastZoomDist) / num > 0.1f || m_isZooming)
					{
						if (m_isZooming)
						{
							float num2 = (magnitude - m_lastZoomDist) / num;
							m_lastZoomDist = magnitude;
							return new TG_TouchGestureEventArgs(base.Type, GetTouchesCenterPosition(), Vector2.one * num2);
						}
						m_isZooming = true;
						m_lastZoomDist = magnitude;
					}
				}
			}
			else
			{
				m_lastZoomDist = -1f;
				m_isZooming = false;
			}
			return null;
		}
	}
}