c#图形化应用程序，为什么我的代码运行出来只在第三个图片框显示img2.png？

//以下是form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        Class1 c1 = new Class1();
        PictureBox[] mypic = new PictureBox[3];
        public Form1()
        {
            InitializeComponent();
        }
        public void update_image()
        {
            mypic = new PictureBox[3];
            mypic[c1.i] = new System.Windows.Forms.PictureBox();
            mypic[c1.i].Location = new Point(c1.i*34);
            this.Controls.Add(mypic[c1.i]);
            mypic[c1.i].Width = c1.Cd;
            mypic[c1.i].Height = c1.Cd;
            c1.one();
            mypic[c1.i].Image = Image.FromFile("img0.png");
            c1.two();            mypic[c1.i].Image = Image.FromFile("img1.png");
            c1.three();            mypic[c1.i].Image = Image.FromFile("img2.png");
            
        }        private void Form1_Load(object sender, EventArgs e)
        {
            c1.circulate();
            update_image();
            
        }
    }
}//以下是class1.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace WindowsFormsApplication6
{
    class Class1
    {
        public int[] maps = {1,2,3};
        public int i;
        public int Cd = 36;
       
        
        public void circulate()
        {
            for (i=0; i < 2;i++ )
            {
               
            }
        }
        public void one()
        {
            circulate();
                if(maps[i]==1)
                {
                }
        }
        public void two()
        {
            circulate();
            if(maps[i]==2)
            {
            }
        }
        public void three()
        {
            circulate();
            if(maps[i]==3)
            {
            }
        }
            }
}这样运行出来的窗口只是显示img2.png，其余的两图片不显示，是我的循环有问题吧？？请帮我以下，本人初学，在做一个推箱子程序，这是从简单开始写的，如有帮助，万分感谢~~~么么