Unity实现简单的虚拟摇杆

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class RockingIcon : MonoBehaviour
{
 public Transform touchPoint;
 public Transform bgPoint;
 public float radius;
 bool isPressing;
 Vector3 bgPos;

 private void Update()
 {
  bool pressing;
  Vector3 pos;
  if (Application.isEditor)
   GetPressingInfoInEditor(out pressing, out pos);
  else
   GetPressingInfoInPhone(out pressing, out pos);
  SetIcon(pressing, pos);

 }

 void GetPressingInfoInEditor(out bool pressing, out Vector3 pos)
 {
  if (Input.GetMouseButton(0))
  {
   pressing = true;
   pos = Input.mousePosition;
  }
  else
  {
   pressing = false;
   pos = Vector3.zero;
  }
 }

 void GetPressingInfoInPhone(out bool pressing, out Vector3 pos)
 {
  if(Input.touchCount > 0)
  {
   pressing = true;
   pos = Input.GetTouch(0).position;
  }
  else
  {
   pressing = false;
   pos = Vector3.zero;
  }
 }


 void SetIcon(bool pressing, Vector3 pos)
 {
  if (pressing)
  {
   if (!isPressing)
   {
    bgPoint.gameObject.SetActive(true);
    bgPoint.transform.position = pos;
    bgPos = pos;
    isPressing = true;
   }
   else
   {
    bgPoint.gameObject.SetActive(true);
    SetTouchPointPos(pos);
   }
  }
  else
  {
   touchPoint.gameObject.SetActive(false);
   bgPoint.gameObject.SetActive(false);
   isPressing = false;
  }
 }

 void SetTouchPointPos(Vector3 pos)
 {
  Vector3 center = bgPoint.position;
  Vector3 touch = pos;
  Vector3 to;
  float distance = Vector3.Distance(center, touch);
  if (distance < radius)
   to = touch;
  else
  {
   Vector3 dir = touch - center;
   dir.Normalize();
   to = dir * radius;
   to += center;
  }
  touchPoint.gameObject.SetActive(true);
  touchPoint.transform.position = to;
 }
}

#region 鼠标操作

float min_move_x = Global.min_move_distance * (Screen.width / 1080f);
float min_move_y = Global.min_move_distance * (Screen.height / 1900f);

if(Application.platform == RuntimePlatform.WindowsEditor)
  {
   if (Input.GetMouseButtonDown(0))
   {
    touch_time = 0;
    first_touch_pos = Input.mousePosition;
   }
   else if (Input.GetMouseButton(0))
   {

    touch_time += Time.deltaTime;
    if (touch_time >= Global.touch_time_limit)
    {
     Vector2 touch_pos = Input.mousePosition;
     Vector2 distance = touch_pos - first_touch_pos;

     //Vector2 touch_pos_in_func = PosInTheFunc(touch_pos);
     //Vector2 first_pos_in_func = PosInTheFunc(first_touch_pos);
     //Vector2 distance = touch_pos_in_func - first_pos_in_func;

     if (Mathf.Abs(distance.x) > min_move_x && Mathf.Abs(distance.x) > Mathf.Abs(distance.y)) Move(distance.x > 0 ? Vector3.right : Vector3.left);
     if (Mathf.Abs(distance.y) > min_move_y && Mathf.Abs(distance.y) > Mathf.Abs(distance.x)) Move(distance.y > 0 ? Vector3.forward : Vector3.back);
    }
   }
   else if (Input.GetMouseButtonUp(0))
   {

    //if(touch_time < Global.touch_time_limit)
    //{
    // PutBoomb();
    //}
    touch_time = 0;
    first_touch_pos = Vector3.zero;
   }
  }
  #endregion
  #region 手机操作

  if (Application.platform == RuntimePlatform.Android)
  {
   if (Input.touchCount > 0)
   {

    Touch touch = Input.GetTouch(0);
    if (touch.phase == TouchPhase.Began)
    {
     first_touch_pos = touch.position;
     

    }
    else if (touch.phase == TouchPhase.Ended)
    {
     first_touch_pos = Vector3.zero;
    }
    else if (touch.phase == TouchPhase.Moved || touch.phase == TouchPhase.Stationary)
    {
     Vector2 touch_pos = touch.position;
     Vector2 distance = touch_pos - first_touch_pos;
     if (Mathf.Abs(distance.x) > min_move_x && Mathf.Abs(distance.x) > Mathf.Abs(distance.y)) Move(distance.x > 0 ? Vector3.right : Vector3.left);
     if (Mathf.Abs(distance.y) > min_move_y && Mathf.Abs(distance.y) > Mathf.Abs(distance.x)) Move(distance.y > 0 ? Vector3.forward : Vector3.back);

    }
   }
  }