csharp 用于Unity的触摸手势检测器。
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using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Events;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
/// <summary>
/// Touch gesture detector for Unity.
/// </summary>
/// <author>KAKO Akihito</author>
/// <email>kako@qnote.co.jp</email>
/// <license>MIT License</license>
public class TouchGestureDetector : MonoBehaviour
{
private const float FLICK_TIME_LIMIT = 0.3f;
public enum Gesture
{
TouchBegin,
TouchMove,
TouchStationary,
TouchEnd,
Click,
FlickTopToBottom,
FlickBottomToTop,
FlickLeftToRight,
FlickRightToLeft,
}
public Camera shootingCamera;
public bool hitCheck = true;
public bool detectFlick = true;
public GestureDetectorEvent onGestureDetected = new GestureDetectorEvent();
private List<TouchInfo> touchInfos = new List<TouchInfo>();
private void Awake()
{
if (null == shootingCamera)
{
shootingCamera = Camera.main;
}
}
private void Update()
{
foreach (var touch in Input.touches)
{
switch (touch.phase)
{
case TouchPhase.Began:
OnTouchBegin(touch.fingerId, touch.position);
break;
case TouchPhase.Moved:
OnTouchMove(touch.fingerId, touch.position);
break;
case TouchPhase.Stationary:
OnTouchStationary(touch.fingerId);
break;
case TouchPhase.Canceled:
case TouchPhase.Ended:
OnTouchEnd(touch.fingerId, touch.position);
break;
}
}
if (Input.touchCount == 0)
{
if (Input.GetMouseButtonDown(0))
{
OnTouchBegin(Int32.MaxValue, Input.mousePosition);
}
else if (Input.GetMouseButtonUp(0))
{
OnTouchEnd(Int32.MaxValue, Input.mousePosition);
}
else
{
OnTouchMove(Int32.MaxValue, Input.mousePosition);
}
}
}
private void OnTouchBegin(int fingerId, Vector2 position)
{
var touchInfo = new TouchInfo(fingerId, position);
if (!hitCheck || touchInfo.IsHit(gameObject, shootingCamera))
{
touchInfos.Add(touchInfo);
OnGestureDetected(Gesture.TouchBegin, touchInfo);
}
}
private void OnTouchMove(int fingerId, Vector2 position)
{
var touchInfo = touchInfos.FirstOrDefault(x => x.fingerId == fingerId);
if (null == touchInfo)
{
return;
}
touchInfo.AddPosition(position);
OnGestureDetected(Gesture.TouchMove, touchInfo);
}
private void OnTouchStationary(int fingerId)
{
var touchInfo = touchInfos.FirstOrDefault(x => x.fingerId == fingerId);
if (null == touchInfo)
{
return;
}
OnGestureDetected(Gesture.TouchStationary, touchInfo);
}
private void OnTouchEnd(int fingerId, Vector2 position)
{
var touchInfo = touchInfos.FirstOrDefault(x => x.fingerId == fingerId);
if (null == touchInfo)
{
return;
}
touchInfo.AddPosition(position);
OnGestureDetected(Gesture.TouchEnd, touchInfo);
var diff = touchInfo.Diff;
var flickDistanceLimit = (float)Math.Min(Screen.width, Screen.height) / 10;
if (detectFlick && touchInfo.ElapsedTime < FLICK_TIME_LIMIT && (Mathf.Abs(diff.x) > flickDistanceLimit || Mathf.Abs(diff.y) > flickDistanceLimit))
{
if (Mathf.Abs(diff.x) > Mathf.Abs(diff.y))
{
if (diff.x < 0f)
{
OnGestureDetected(Gesture.FlickRightToLeft, touchInfo);
}
else
{
OnGestureDetected(Gesture.FlickLeftToRight, touchInfo);
}
}
else
{
if (diff.y < 0f)
{
OnGestureDetected(Gesture.FlickTopToBottom, touchInfo);
}
else
{
OnGestureDetected(Gesture.FlickBottomToTop, touchInfo);
}
}
}
else if (hitCheck && touchInfo.IsHit(gameObject, shootingCamera))
{
OnGestureDetected(Gesture.Click, touchInfo);
}
touchInfos.RemoveAll(x => x.fingerId == fingerId);
}
private void OnGestureDetected(Gesture gesture, TouchInfo touchInfo)
{
onGestureDetected.Invoke(gesture, touchInfo);
}
public class TouchInfo
{
public Vector2 Diff
{
get
{
return new Vector2(positions.Last().x - positions.First().x, positions.Last().y - positions.First().y);
}
}
public float ElapsedTime
{
get
{
return Time.realtimeSinceStartup - startTime;
}
}
public readonly int fingerId;
private float startTime;
private List<Vector2> positions = new List<Vector2>();
public TouchInfo(int fingerId, Vector2 position)
{
this.fingerId = fingerId;
startTime = Time.realtimeSinceStartup;
AddPosition(position);
}
public void AddPosition(Vector2 position)
{
positions.Add(position);
}
public bool IsHit(GameObject targetGameObject, Camera camera = null)
{
if (null == camera)
{
camera = Camera.main;
}
var lastTouchPosition = positions.Last();
if (null == targetGameObject.GetComponent<RectTransform>())
{
var ray = camera.ScreenPointToRay(lastTouchPosition);
var hit = new RaycastHit();
return Physics.Raycast(ray, out hit) && hit.collider.gameObject == targetGameObject;
}
else
{
var pointerEventData = new PointerEventData(EventSystem.current);
pointerEventData.position = lastTouchPosition;
var raycastResults = new List<RaycastResult>();
EventSystem.current.RaycastAll(pointerEventData, raycastResults);
if (raycastResults.Count == 0)
{
return false;
}
var resultGameObject = raycastResults.First().gameObject;
while (null != resultGameObject)
{
if (resultGameObject == targetGameObject)
{
return true;
}
var parent = resultGameObject.transform.parent;
resultGameObject = null != parent ? parent.gameObject : null;
}
return false;
}
}
}
public class GestureDetectorEvent : UnityEvent<Gesture, TouchInfo>
{
public GestureDetectorEvent()
{
}
}
}
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