核心代码:
using UnityEngine;
using System.Collections;
using UnityEngine.UI; public delegate void JoystickMoveDelegate(JoystickData data); public class Joystick : MonoBehaviour { public GameObject joystickUI; //摇杆整体UI,方便Active
public RectTransform joystickCenter; //摇杆重心
public RectTransform joystickBackground; //摇杆背景 private float halfScreenWidth;
private float halfScreenHeight;
private RectTransform joystickRect;
private float radius;
private Vector3 lastMousePosition; public static event JoystickMoveDelegate JoystickMoveEvent; // Use this for initialization
void Start () {
halfScreenWidth = Screen.width / 2;
halfScreenHeight = Screen.height / 2;
joystickRect = this.gameObject.GetComponent<RectTransform>();
radius = 71; } // Update is called once per frame
void Update () {
JoystickController();
} public void JoystickController()
{
//鼠标一直按下
if (Input.GetMouseButton(0))
{
float distance = Vector2.Distance(new Vector2(Input.mousePosition.x, Input.mousePosition.y), joystickRect.anchoredPosition); if (distance < radius)
{
//当距离小于半径就开始移动 摇杆重心
joystickCenter.anchoredPosition = new Vector2(Input.mousePosition.x - joystickRect.anchoredPosition.x, Input.mousePosition.y - joystickRect.anchoredPosition.y);
}
else
{
//求圆上的一点：(目标点-原点) * 半径/原点到目标点的距离
Vector2 endPosition = (new Vector2(Input.mousePosition.x, Input.mousePosition.y) - joystickRect.anchoredPosition) * radius / distance;
joystickCenter.anchoredPosition = endPosition;
} if (JoystickMoveEvent != null)
{ JoystickMoveEvent(new JoystickData() { x = joystickCenter.anchoredPosition.x - joystickBackground.anchoredPosition.x, y = joystickCenter.anchoredPosition.y - joystickBackground.anchoredPosition.y });
} } //鼠标按下
if (Input.GetMouseButtonDown(0))
{
this.joystickUI.SetActive(true); //鼠标单击左边屏幕
if (Input.mousePosition.x < halfScreenWidth)
{
joystickRect.anchoredPosition = Input.mousePosition; } //鼠标单击右边屏幕
if (Input.mousePosition.x >= halfScreenWidth)
{
// Debug.Log("鼠标单击右边");
}
} //鼠标释放的时候
if (Input.GetMouseButtonUp(0))
{
this.joystickUI.SetActive(false);
}
}
} public class JoystickData
{
public float x;
public float y; }
效果图:
Unity5.1版本:
实例下载地址: http://yunpan.cn/cchdURtqCWXxv 访问密码 0aba