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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