如何循环图片框左移 [英] How to loop picturebox going left inifnity

问题描述

我正在制作幻灯片图像，图像的方向向左。

I'm making a slideshow image and the direction of images is going left.

现在我的问题是如何使其成为无限循环？一旦出现最后一张图像，我想再次显示第一张图像，直到最后一张图像。我该怎么做？这是我的代码：

Now my problem is how can I make it an infinite loop? Once the last image appears, I want to show again the first image up to the last image again. How can I make this? Heres my code:

PictureBox[] clouds = new PictureBox[4];

public Form2()
{
   InitializeComponent();
}

private void Form2_Load(object sender, EventArgs e)
{
   speed = 3;
   clouds[0] = pictureBox1;
   clouds[1] = pictureBox2;
   clouds[2] = pictureBox3;
   clouds[3] = pictureBox4;
}

private void timer1_Tick(object sender, EventArgs e)
{
   for (int x = 0; x < 4; x++)
   {
      clouds[x].Left -= 10;

      if (clouds[x].Left == 0)
      {
         clouds[x].Left = +this.Width;
      }
   }
}

推荐答案

如果我理解的正确，您想要

If I understand you right, you want

 0, 1, 2, 3, 0, 1, 2, 3, 0, ...

序列。可以实现为

 // x = 0          - start with x = 0
 //                - no condition (infinte loop)
 // x = (x + 1) %4 - modulo arithemetics: 0, 1, 2, 3, 0, 1, 2, 3, 0 ....
 for (int x = 0; ; x = (x + 1) % 4) {
   ... 
 }

通常情况下，对于 clouds [] 数组，我们可以摆脱幻数 4

In general case for clouds[] array we can get rid of magic number 4

 for (int x = 0; ; x = (x + 1) % array.Length) {
   ... 
 }

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