UGUI简易摇杆

实现

1. 直接使用系统自带圆形控件图标
2. 编写脚本, 实现UGUI拖拽事件
3. 将多拽范围限定于给定半径和圆心的圆内
4. 计算出等同于Input.GetAxis()的值,直接控制被控制物体

代码

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

public class MyJoystick : MonoBehaviour, IDragHandler, IPointerUpHandler, IEndDragHandler
{
    public float Radius = 100f;
    private Vector2 center;
    private RectTransform rectTransform;
    // Use this for initialization
    void Start()
    {
        rectTransform = GetComponent<RectTransform>();
        center = rectTransform.position;
    }


    public void OnDrag(PointerEventData eventData)
    {
        Vector2 vPos = eventData.position;
        var distance = Vector2.Distance(vPos, center);
        if (distance > Radius)
        {
            vPos = (vPos - center).normalized * Radius + center;
        }
        rectTransform.position = new Vector3(vPos.x, vPos.y, 0);

        // if (TTMove)
        // {
        //     var npos = (vPos - center) / Radius;
        //     TTMove.forwardInput = npos.y;
        //     TTMove.turnInput = npos.x;
        // }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        rectTransform.position = new Vector3(center.x, center.y, 0);
        // if (TTMove)
        //     TTMove.forwardInput = TTMove.turnInput = 0;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        rectTransform.position = new Vector3(center.x, center.y, 0);
        // if (TTMove)
        //     TTMove.forwardInput = TTMove.turnInput = 0;
    }
}

把脚本挂到

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