Unity实现攻击范围检测并绘制检测区域

本文实例为大家分享了Unity实现攻击范围检测并绘制检测区域的具体代码，供大家参考，具体内容如下

一、圆形检测

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

/// <summary>
/// 圆形检测，并绘制出运行的攻击范围
/// </summary>
public class CircleDetect : MonoBehaviour {

  GameObject go;  //生成矩形的对象
  public Transform attack;    //被攻击方

  MeshFilter mf;
  MeshRenderer mr;
  Shader shader;

 void Start () {

 }

 void Update () {
    if (Input.GetKeyDown(KeyCode.A))
    {
      ToDrawCircleSolid(transform, transform.localPosition, 3);
      if (CircleAttack(attack,transform,3))
      {
        Debug.Log("攻击到了");
      }
    }

    if (Input.GetKeyUp(KeyCode.A))
    {
      if (go != null)
      {
        Destroy(go);
      }
    }
 }

  /// <summary>
  /// 圆形检测
  /// </summary>
  /// <param name="attacked">被攻击者</param>
  /// <param name="skillPostion">技能的位置</param>
  /// <param name="radius">半径</param>
  /// <returns></returns>
  public bool CircleAttack(Transform attacked, Transform skillPostion, float radius)
  {
    float distance = Vector3.Distance(attacked.position, skillPostion.position);
    if (distance <= radius)
    {
      return true;
    }
    else
    {
      return false;
    }
  }

  //生成网格
  public GameObject CreateMesh(List<Vector3> vertices)
  {
    int[] triangles;
    Mesh mesh = new Mesh();
    int triangleAmount = vertices.Count - 2;
    triangles = new int[3 * triangleAmount];

    //根据三角形的个数，来计算绘制三角形的顶点顺序
    //顺序必须为顺时针或者逆时针
    for (int i = 0; i < triangleAmount; i++)
    {
      triangles[3 * i] = 0;
      triangles[3 * i + 1] = i + 1;
      triangles[3 * i + 2] = i + 2;
    }

    if (go == null)
    {
      go = new GameObject("circle");
      go.transform.SetParent(transform, false);
      go.transform.position = new Vector3(0, -0.4f, 0);

      mf = go.AddComponent<MeshFilter>();
      mr = go.AddComponent<MeshRenderer>();
      shader = Shader.Find("Unlit/Color");
    }
    //分配一个新的顶点位置数组
    mesh.vertices = vertices.ToArray();
    //包含网格中所有三角形的数组
    mesh.triangles = triangles;
    mf.mesh = mesh;
    mr.material.shader = shader;
    mr.material.color = Color.red;
    return go;

  }

  /// <summary>
  /// 绘制实心圆形
  /// </summary>
  /// <param name="t">圆形参考物</param>
  /// <param name="center">圆心</param>
  /// <param name="radius">半径</param>
  public void ToDrawCircleSolid(Transform t, Vector3 center, float radius)
  {
    int pointAmount = 100;
    float eachAngle = 360f / pointAmount;
    Vector3 forward = t.forward;

    List<Vector3> vertices = new List<Vector3>();
    for (int i = 0; i < pointAmount; i++)
    {
      Vector3 pos = Quaternion.Euler(0f, eachAngle * i, 0f) * forward * radius + center;
      vertices.Add(pos);
    }
    CreateMesh(vertices);
  }

}

效果图：

二、矩形检测

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

/// <summary>
/// 矩形型攻击检测，并绘制检测区域
/// </summary>
public class DrawRectangDetect : MonoBehaviour {

  public Transform attacked;
  GameObject go;   //生成矩形
  MeshFilter mf;
  MeshRenderer mr;
  Shader shader;

 void Start () {

 }

 void Update () {
    if (Input.GetKeyDown(KeyCode.A))
    {
      ToDrawRectangleSolid(transform, transform.localPosition, 4, 2);

      if (RectAttackJubge(transform, attacked, 4, 2f))
      {
        Debug.Log("攻击到");
      }
    }

    if (Input.GetKeyUp(KeyCode.A))
    {
      if (go != null)
      {
        Destroy(go);
      }
    }
 }

  /// <summary>
  /// 矩形攻击范围
  /// </summary>
  /// <param name="attacker">攻击方</param>
  /// <param name="attacked">被攻击方</param>
  /// <param name="forwardDistance">矩形前方的距离</param>
  /// <param name="rightDistance">矩形宽度/2</param>
  /// <returns></returns>
  public bool RectAttackJubge(Transform attacker, Transform attacked, float forwardDistance, float rightDistance)
  {
    Vector3 deltaA = attacked.position - attacker.position;

    float forwardDotA = Vector3.Dot(attacker.forward, deltaA);
    if (forwardDotA > 0 && forwardDotA <= forwardDistance)
    {
      if (Mathf.Abs(Vector3.Dot(attacker.right,deltaA)) < rightDistance)
      {
        return true;
      }
    }
    return false;
  }

  //制作网格
  private GameObject CreateMesh(List<Vector3> vertices)
  {
    int[] triangles;
    Mesh mesh = new Mesh();

    int triangleAmount = vertices.Count - 2;
    triangles = new int[3 * triangleAmount];

    for (int i = 0; i < triangleAmount; i++)
    {
      triangles[3 * 1] = 0;
      triangles[3 * i + 1] = i + 1;
      triangles[3 * i + 2] = i + 2;
    }

    if (go == null)
    {
      go = new GameObject("Rectang");
      go.transform.position = new Vector3(0, 0.1f, 0);
      mf = go.AddComponent<MeshFilter>();
      mr = go.AddComponent<MeshRenderer>();

      shader = Shader.Find("Unlit/Color");
    }

    mesh.vertices = vertices.ToArray();
    mesh.triangles = triangles;
    mf.mesh = mesh;
    mr.material.shader = shader;
    mr.material.color = Color.red;

    return go;
  }

  /// <summary>
  /// 绘制实心长方形
  /// </summary>
  /// <param name="t">矩形参考物</param>
  /// <param name="bottomMiddle">矩形的中心点</param>
  /// <param name="length">矩形长度</param>
  /// <param name="width">矩形宽度的一半</param>
  public void ToDrawRectangleSolid(Transform t, Vector3 bottomMiddle, float length, float width)
  {
    List<Vector3> vertices = new List<Vector3>();

    vertices.Add(bottomMiddle - t.right * width);
    vertices.Add(bottomMiddle - t.right * width + t.forward * length);
    vertices.Add(bottomMiddle + t.right * width + t.forward * length);
    vertices.Add(bottomMiddle + t.right * width );

    CreateMesh(vertices);
  }
}

效果图：

三、扇形攻击检测

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

/// <summary>
/// 扇型攻击检测，并绘制检测区域
/// </summary>
public class SectorDetect : MonoBehaviour {

  public Transform attacked; //受攻击着
  GameObject go;
  MeshFilter mf;
  MeshRenderer mr;
  Shader shader;

 void Start () {

 }

 void Update () {

    if (Input.GetKeyDown(KeyCode.A))
    {
      ToDrawSectorSolid(transform, transform.localPosition, 60, 3);
      if (UmbrellaAttact(transform,attacked.transform,60,4))
      {
        Debug.Log("受攻击了");
      }
    }

    if (Input.GetKeyUp(KeyCode.A))
    {
      if (go != null)
      {
        Destroy(go);
      }
    }
 }

  /// <summary>
  /// 扇形攻击范围
  /// </summary>
  /// <param name="attacker">攻击者</param>
  /// <param name="attacked">被攻击方</param>
  /// <param name="angle">扇形角度</param>
  /// <param name="radius">扇形半径</param>
  /// <returns></returns>
  public bool UmbrellaAttact(Transform attacker, Transform attacked, float angle, float radius)
  {
    Vector3 deltaA = attacked.position - attacker.position;

    //Mathf.Rad2Deg : 弧度值到度转换常度
    //Mathf.Acos(f) : 返回参数f的反余弦值
    float tmpAngle = Mathf.Acos(Vector3.Dot(deltaA.normalized, attacker.forward)) * Mathf.Rad2Deg;
    if (tmpAngle < angle * 0.5f && deltaA.magnitude < radius)
    {
      return true;
    }
    return false;
  }

  public void ToDrawSectorSolid(Transform t, Vector3 center, float angle, float radius)
  {
    int pointAmmount = 100;
    float eachAngle = angle / pointAmmount;

    Vector3 forward = t.forward;
    List<Vector3> vertices = new List<Vector3>();

    vertices.Add(center);
    for (int i = 0; i < pointAmmount; i++)
    {
      Vector3 pos = Quaternion.Euler(0f, -angle / 2 + eachAngle * (i - 1), 0f) * forward * radius + center;
      vertices.Add(pos);
    }
    CreateMesh(vertices);
  }

  private GameObject CreateMesh(List<Vector3> vertices)
  {
    int[] triangles;
    Mesh mesh = new Mesh();

    int triangleAmount = vertices.Count - 2;
    triangles = new int[3 * triangleAmount];

    //根据三角形的个数，来计算绘制三角形的顶点顺序
    for (int i = 0; i < triangleAmount; i++)
    {
      triangles[3 * i] = 0;
      triangles[3 * i + 1] = i + 1;
      triangles[3 * i + 2] = i + 2;
    }

    if (go == null)
    {
      go = new GameObject("mesh");
      go.transform.position = new Vector3(0f, 0.1f, 0.5f);

      mf = go.AddComponent<MeshFilter>();
      mr = go.AddComponent<MeshRenderer>();

      shader = Shader.Find("Unlit/Color");
    }

    mesh.vertices = vertices.ToArray();
    mesh.triangles = triangles;

    mf.mesh = mesh;
    mr.material.shader = shader;
    mr.material.color = Color.red;

    return go;
  }
}

效果图：

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