C# Chart折线图使用鼠标滚轮放大、缩小和平移曲线方式

this.chart1.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.chart1_MouseWheel);

private void chart1_MouseWheel(object sender, MouseEventArgs e)
{
	// 实验发现鼠标滚轮滚动一圈时e.Delta = 120，正反转对应正负120
	if (chart1.ChartAreas[0].AxisX.ScaleView.Size > 0) // 防止越过左边界
	{
		chart1.ChartAreas[0].AxisX.ScaleView.Size += (e.Delta / 120); // 每次缩放1
	}
	else if(e.Delta > 0)
	{
		chart1.ChartAreas[0].AxisX.ScaleView.Size += (e.Delta / 120); // 每次缩放1
	}           
}     

// 定义两个全局变量
public bool isMouseDown = false;
public int lastMove = 0; // 用于记录鼠标上次移动的点，用于判断是左移还是右移
// 初始化ScaleView，可根据首次出现在chart中的数据点数修改合适的值
chart1.ChartAreas[0].AxisX.ScaleView.Size = 5;
// 设置不显示chart自带的滚动条
chart1.ChartAreas[0].AxisX.ScrollBar.Enabled = false;
chart1.ChartAreas[0].AxisY.ScrollBar.Enabled = false;
// 注意不要开启X轴游标，默认不开启，如下设置false或者不设置下列参数
chart1.ChartAreas[0].CursorX.IsUserEnabled = false;
chart1.ChartAreas[0].CursorX.AutoScroll = false;
chart1.ChartAreas[0].CursorX.IsUserSelectionEnabled = false;

// 鼠标按下事件
private void chart1_MouseDown(object sender, MouseEventArgs e)
{
	lastMove  = 0;
    isMouseDown = true;
}
// 鼠标弹起事件
private void chart1_MouseUp(object sender, MouseEventArgs e)
{
    isMouseDown = false;
}
// 鼠标移动事件
private void chart1_MouseMove(object sender, MouseEventArgs e)
{
    if (isMouseDown)
    {
    	// 可更改（交换）如下加减1或if条件来设置鼠标移动时曲线移动方向
        if(lastMove != 0 && e.X - lastMove > 0)
            chart1.ChartAreas[0].AxisX.ScaleView.Position += 1;  // 每次移动1
        else if(lastMove != 0 && e.X - lastMove < 0)
            chart1.ChartAreas[0].AxisX.ScaleView.Position -= 1; // 每次移动1
        lastMove = e.X;
    }
}

public partial class Form1 : Form
    {
        int cnt = 0;
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }
 
        private void timer1_Tick(object sender, EventArgs e)
        {
            chart1.Series[0].Points.AddY(cnt*cnt);
            label1.Text = cnt.ToString();
            cnt++;
        }
 
        private void chart1_Click(object sender, EventArgs e)
        {
 
        }
    }