Unity Gizmos绘制指定长宽的网格

 using UnityEngine;
 using System.Collections;

 public class GridMap : MonoBehaviour {

     public int m_mapWidth = ;  //宽度
     public int m_mapHeight = ; //长度

     void OnDrawGizmos()
     {
         Gizmos.color = Color.blue;

         //绘制宽度的线
         for (int i = ; i < m_mapWidth; i++)
         {
             Gizmos.DrawLine(new Vector3(, , i), new Vector3(m_mapHeight, , i));
         }

         //绘制长度的线
         for (int i = ; i < m_mapHeight; i++)
         {
             Gizmos.DrawLine(new Vector3(i, , ), new Vector3(i, , m_mapWidth));
         }
     }
 }