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, );

        // 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, );

        // if (TTMove)

        //     TTMove.forwardInput = TTMove.turnInput = 0;

    }

    public void OnEndDrag(PointerEventData eventData)

    {

        rectTransform.position = new Vector3(center.x, center.y, );

        // if (TTMove)

        //     TTMove.forwardInput = TTMove.turnInput = 0;

    }

}

把脚本挂到

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