C#Chart使用鼠标滚轮放大，缩小，平移曲线

放大缩小

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

private void chart1_MouseWheel(object sender, MouseEventArgs e)
{
    //鼠标向上滚的Delta值是120，向下是-120
    if(e.Delta == 120)
    {
        if (chart1.ChartAreas[0].AxisX.ScaleView.Size > 0)
        {
            chart1.ChartAreas[0].AxisX.ScaleView.Size /= 2;//每页显示的点数除以2实现放大效果
        }
        else
        {
            chart1.ChartAreas[0].AxisX.ScaleView.Size = chart1.Series[0].Points.Count/2;//首次滚动时size为NaN
        }
    }
    else if (e.Delta == -120)
    {
        if (chart1.ChartAreas[0].AxisX.ScaleView.Size > 0)
        {
            chart1.ChartAreas[0].AxisX.ScaleView.Size *= 2;
        }
        else
        {
            chart1.ChartAreas[0].AxisX.ScaleView.Size = chart1.Series[0].Points.Count * 2;
        }
    }
}

平移

    public int chartBeforePoint = 0; // 用于记录鼠标上次移动的点，用于判断是左移还是右移
    

    private void chart1_MouseDown(object sender, MouseEventArgs e)
    {
        chartBeforePoint = 0;
        chartFlag = true;
    }

    private void chart1_MouseUp(object sender, MouseEventArgs e)
    {
        chartFlag = true;
    }

    private void chart1_MouseMove(object sender, MouseEventArgs e)
    {
        if (chartFlag)
        {
            //e.x代表的是当前点
            if (chartBeforePoint != 0 && e.X - chartBeforePoint > 0)//往右移动了
                chart1.ChartAreas[0].AxisX.ScaleView.Position += 1; 
            else if (chartBeforePoint != 0 && e.X - chartBeforePoint < 0)//往左移动了
                chart1.ChartAreas[0].AxisX.ScaleView.Position -= 1;
            chartBeforePoint = e.X;
        }
    }

最后

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