unity3d - Unity，尝试在 3d 等距游戏中射击时出错

Question

我正在制作一个 3d 等距游戏，我正在尝试从玩家向操纵杆的方向射击，我希望它在我释放操纵杆时射击。您可以轻松搜索 Brawl Stars 视频以更好地理解我的意思。第一个脚本是操纵杆的，第二个是拍摄的（我把它放在播放器里面）。现在它给了我这个错误：你要实例化的对象是空的。

操纵杆的脚本：

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections;

public class rightjoystick : MonoBehaviour, IDragHandler, IPointerUpHandler, IPointerDownHandler
{
private Image bgImg;
private Image joystickImg;
private Vector3 inputVector;

private void Start()
{
    bgImg = GetComponent<Image>();
    joystickImg = transform.GetChild(0).GetComponent<Image>();
}

public virtual void OnDrag(PointerEventData ped)
{
    Vector2 pos;
    if (RectTransformUtility.ScreenPointToLocalPointInRectangle(bgImg.rectTransform, ped.position, ped.pressEventCamera, out pos))
    {
        pos.x = (pos.x / bgImg.rectTransform.sizeDelta.x);
        pos.y = (pos.y / bgImg.rectTransform.sizeDelta.y);

        inputVector = new Vector3(pos.x * 2, 0, pos.y * 2);
        inputVector = (inputVector.magnitude > 1.0f) ? inputVector.normalized : inputVector;

        // Move joystickImg
        joystickImg.rectTransform.anchoredPosition =
            new Vector3(inputVector.x * bgImg.rectTransform.sizeDelta.x / 3
                , inputVector.z * (bgImg.rectTransform.sizeDelta.y / 3));

    }
}

public virtual void OnPointerDown(PointerEventData ped)
{
    OnDrag(ped);
}

public virtual void OnPointerUp(PointerEventData ped)
{
    inputVector = Vector3.zero;
    joystickImg.rectTransform.anchoredPosition = Vector3.zero;
}

public float Horizontal()
{
    if (inputVector.x != 0)
        return inputVector.x;
    else
        return Input.GetAxis("Horizontal");
}

public float Vertical()
{
    if (inputVector.z != 0)
        return inputVector.z;
    else
        return Input.GetAxis("Vertical");
}
}

拍摄脚本：

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

public class shoot : MonoBehaviour
{
public Rigidbody proiettile;
public float launchForce = 70f;
public rightjoystick moveJoystick;
private Vector3 dir = Vector3.zero;

public void Update()
{
    dir.x = moveJoystick.Horizontal();
    dir.z = moveJoystick.Vertical();
}

private void FixedUpdate()
{
    var projectileInstance = Instantiate(proiettile);
    projectileInstance.AddForce(dir * launchForce);
}
}

标签： unity3d

Answer 1

我解决了这个问题：

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections;

public class shoot : MonoBehaviour, IDragHandler, IPointerUpHandler, IPointerDownHandler
{
private Image bgImg;
private Image joystickImg;
private Vector3 inputVector;
public Rigidbody proiettile;
private Vector3 dir = Vector3.zero;
private Vector3 newpos;
public float launchForce;
public Rigidbody Player;
private Rigidbody clone;

private void Start()
{
    bgImg = GetComponent<Image>();
    joystickImg = transform.GetChild(0).GetComponent<Image>();
}

public virtual void OnDrag(PointerEventData ped)
{
    Vector2 pos;
    if (RectTransformUtility.ScreenPointToLocalPointInRectangle(bgImg.rectTransform, ped.position, ped.pressEventCamera, out pos))
    {
        pos.x = (pos.x / bgImg.rectTransform.sizeDelta.x);
        pos.y = (pos.y / bgImg.rectTransform.sizeDelta.y);

        inputVector = new Vector3(pos.x * 2 +1, 0, pos.y * 2 - 1);
        inputVector = (inputVector.magnitude > 1.0f) ? inputVector.normalized : inputVector;

        // Move joystickImg
        joystickImg.rectTransform.anchoredPosition =
            new Vector3(inputVector.x * bgImg.rectTransform.sizeDelta.x / 3
                , inputVector.z * (bgImg.rectTransform.sizeDelta.y / 3));

    }
}

public virtual void OnPointerDown(PointerEventData ped)
{
    OnDrag(ped);
}

public virtual void OnPointerUp(PointerEventData ped)
{
    dir.x = Horizontal();
    dir.z = Vertical();
    newpos = dir * (launchForce);
    clone = Instantiate(proiettile, Player.transform.position, Player.transform.rotation);

    clone.transform.position=Vector3.MoveTowards(Player.transform.position,newpos,10f);
    // joystick come back to start position
    inputVector = Vector3.zero;
    joystickImg.rectTransform.anchoredPosition = Vector3.zero;
    clone.timeoutDestructor = 5;
}

public float Horizontal()
{
    if (inputVector.x != 0)
        return inputVector.x;
    else
        return Input.GetAxis("Horizontal");
}

public float Vertical()
{
    if (inputVector.z != 0)
        return inputVector.z;
    else
        return Input.GetAxis("Vertical");
}
}