Unity+FairyGUI）rpg方向控制的方向盘控制/摇杆

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;
using FairyGUI;
using Package1;

namespace Assets.Scripts
{
class Wheel : UIBase
{
private float rad = 200f; //活动半径
private Vector2 center = new Vector2(200, 200);//中心

private Vector2 resultVector2;//结果

private UI_WheelCenter center_ui;

override public void init()
{
center_ui = ((UI_Wheel)this.ui).m_center_ui;
center_ui.draggable = true;

center_ui.onDragStart.Add(dragStartHandler);
center_ui.onDragEnd.Add(dragEndHandler);
center_ui.onDragMove.Add(dragMoveHandler);
}

private void dragEndHandler() {
center_ui.x = center.x;
center_ui.y = center.y;
MoveManager.getInstance().moveAngle = 0;
}

private void dragStartHandler() {

}

private void dragMoveHandler(EventContext _event) {

Vector2 cur = new Vector2(center_ui.x, center_ui.y);

float dis = Vector2.Distance(center, cur);
float ang = Mathf.Atan((cur.y - center.y) / (cur.x - center.x));
if (ang < 0)
{
if (cur.x < center.x)
{
ang += Mathf.PI;
}
else
{
ang += 2 * Mathf.PI;
}
}
else
{
if (cur.x < center.x)
{
ang += Mathf.PI;
}
}
//Debug.Log("罗盘角度=" + Mathf.Rad2Deg * ang + ",坐标=" + cur.x +"," +cur.y);
MoveManager.getInstance().moveAngle = ang;

if (dis > rad*2)
{
center_ui.x = center.x + rad * Mathf.Cos(ang);
center_ui.y = center.y + rad * Mathf.Sin(ang);
}
else {
Vector2 touchVec = new Vector2(_event.inputEvent.x, _event.inputEvent.y);
Vector2 newVec = this.ui.GlobalToLocal(touchVec);
center_ui.x = newVec.x;
center_ui.y = newVec.y;
}

MoveManager.getInstance().breakLock();
}
}
}