http://www.cnblogs.com/zhangbaochong/p/4928688.html
一、用NGUI创建虚拟摇杆贴图
先创建一个sprite作为背景叫做JoyStick 并添加一个BoxCollider，再创建一个sprite child作为虚拟摇杆中间的按钮，叫做button
二、通过虚拟摇杆获得x，y偏移值
1 using UnityEngine;
2 using System.Collections;
3
4 public class JoyStick : MonoBehaviour
5 {
6
7 private bool isPress = false;
8 private Transform button;
9
10 //从虚拟摇杆的得到的x，y偏移值-1到1之间
11 public static float h = 0;
12 public static float v = 0;
13 void Awake()
14 {
15 button = transform.FindChild("button");
16 }
17 void OnPress(bool isPress)
18 {
19 this.isPress = isPress;
20 if (!isPress)
21 {
22 button.localPosition = Vector2.zero;
23 h = 0;
24 v = 0;
25 }
26 }
27
28 void Update()
29 {
30 if (isPress)
31 {
32 Vector2 touchPos = UICamera.lastEventPosition - new Vector2(91, 91);
33 float distance = Vector2.Distance(Vector2.zero, touchPos);
34 if (distance > 73)//虚拟摇杆按钮不能超过半径
35 {
36 touchPos = touchPos.normalized * 73;
37 }
38 button.localPosition = touchPos;
39
40 h = touchPos.x / 73;
41 v = touchPos.y / 73;
42 }
43 }
44 }
三、通过偏移控制移动 主角添加了character controller
1 using UnityEngine;
2 using System.Collections;
3
4 public class PlayerMove : MonoBehaviour
5 {
6 private CharacterController cc;
7 public float speed = 3f;
8
9 void Awake()
10 {
11 cc = GetComponent<CharacterController>();
12 }
13
14 // Update is called once per frame
15 void Update ()
16 {
17 //键盘控制
18 float h = Input.GetAxis("Horizontal");
19 float v = Input.GetAxis("Vertical");
20
21 //虚拟摇杆控制
22 if (JoyStick.h != 0 || JoyStick.v != 0)
23 {
24 h = JoyStick.h;
25 v = JoyStick.v;
26 }
27
28 if (Mathf.Abs(h) > 0.1f || Mathf.Abs(v) > 0.1f)
29 {
30 Vector3 targetDir = new Vector3(h, 0, v);
31 transform.LookAt(targetDir + transform.position);
32 cc.SimpleMove(targetDir * speed);
33 }
34
35
36 }
37 }