红绿灯的设计

时间：2011-02-23 来源：hfliyi

当单击“启动”按钮的时候，我们把Timer控件的Enabled的值设置为true，也就是启用Timer这个控件；

然后再Timer的Tick事件函数里面写如下代码：

View Code

int i =0；
private void timer1_Tick(object sender, EventArgs e)
        {
            if (i == 0)
            {
                this.red.BackColor = Color.Red;
                this.yellow.BackColor = Color.Black;
                this.green.BackColor = Color.Black;
                i = 1;
            }
            else if (i == 1)
            {
                this.red.BackColor = Color.Black;
                this.yellow.BackColor = Color.Yellow;
                this.green.BackColor = Color.Black;
                i = 2;
            }
            else if (i == 2)
            {
                this.red.BackColor = Color.Black;
                this.yellow.BackColor = Color.Black;
                this.green.BackColor = Color.Green;
                i = 0;
            }
            

        }

另外我们在Form_Load事件函数里面写上如下代码，作用是在加载Form的时候，把各个PictureBox控件的背景颜色设置为黑色。

View Code

1 private void Form1_Load(object sender, EventArgs e)
2         {
3             this.red.BackColor = Color.Black;
4             this.green.BackColor = Color.Black;
5             this.yellow.BackColor = Color.Black;
6         }