问如何将精灵的速度设置为与鼠标指针相反的方向？
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Stack Overflow用户

提问于 2019-01-29 16:57:03

回答 1查看 63关注 0票数 0

/*I正在用Unity制作一个2d游戏，它的工作原理类似于台球，但与其他方面类似。当球员按住按钮0时，一条线拖离球，以显示球将被击出的方向和速度。我不知道如何设置速度，或者如何添加这样的力。

我试着直接设置速度，然后添加假摩擦，但效果不是很好。我还试着给球增加一个力，并在指针后面做一个空的游戏对象，用一个点效应器来排斥球。但是我似乎不能让任何东西工作。--另外，我为混乱的代码道歉，我对此还是个新手*/

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

public class LineDrawer : MonoBehaviour
{
public Transform tr; //this is the transform and rigid body 2d of the 
ball
public Rigidbody2D rb;
public LineRenderer line; // the line rendered is on the ball 
public float hitForce = 10;
// Start is called before the first frame update
void Start()
{
    line = GetComponent<LineRenderer>();
    line.SetColors(Color.black, Color.white);

}

// Update is called once per frame
void FixedUpdate()
{
    line.SetPosition(0, tr.position - new Vector3(0, 0, 0));

    if (Input.GetMouseButton(0)&&PlayerPrefs.GetInt("Moving")==0)
    {
        line.SetWidth(.25f, .25f);
        line.SetPosition(1, Camera.main.ScreenToWorldPoint(Input.mousePosition));
        float len = Vector2.Distance(line.GetPosition(0), line.GetPosition(1)); //this is for determining the power of the hit


    }
    else
    {
        line.SetWidth(0, 0); //make the line invisible
    }
    if (Input.GetMouseButtonUp(0) && (PlayerPrefs.GetInt("Moving")==0))
    {
        Vector2.Distance(Input.mousePosition, tr.position)*100;
         Debug.Log("Up");
        rb.velocity = //this is what i cant work out
         PlayerPrefs.SetInt("Moving", 1);

    }
}

}

//从底部开始的5行是我设置速度的位置。

unity3d

回答 1

Stack Overflow用户

回答已采纳

发布于 2019-01-30 02:24:33

只需将您的脚本重写为以下代码：

using UnityEngine;

public class Ball : MonoBehaviour
{

    private LineRenderer line; 
    private Rigidbody2D rb;

    void Start()
    {
        line = GetComponent<LineRenderer>();
        rb = GetComponent<Rigidbody2D>();
    }

    void Update()
    {
        line.SetPosition(0, transform.position);

        if (Input.GetMouseButton(0))
        {
            line.startWidth = .05f;
            line.endWidth = .05f;
            line.SetPosition(1, Camera.main.ScreenToWorldPoint(Input.mousePosition));           
        }
        else
        {
            line.startWidth = 0;
            line.endWidth = 0;
        }

        if (Input.GetMouseButtonUp(0))
        {
            Vector2 direction = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
            direction.Normalize();
            rb.AddForce(direction * 3f, ForceMode2D.Impulse);       
        }
    }
}