在c#中的颜色范围跟踪条？

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ColorRangeTrackerExample
{
    public partial class MainForm : Form
    {
        private Color startColor;
        private Color endColor;

        public MainForm()
        {
            InitializeComponent();

            // 初始化颜色范围
            startColor = Color.Red;
            endColor = Color.Blue;

            // 设置滑块的最小值和最大值
            startSlider.Minimum = 0;
            startSlider.Maximum = 255;
            endSlider.Minimum = 0;
            endSlider.Maximum = 255;

            // 绑定滑块值改变事件
            startSlider.ValueChanged += StartSlider_ValueChanged;
            endSlider.ValueChanged += EndSlider_ValueChanged;
        }

        private void StartSlider_ValueChanged(object sender, EventArgs e)
        {
            // 更新起始颜色
            startColor = Color.FromArgb(startSlider.Value, startColor.G, startColor.B);
            Refresh();
        }

        private void EndSlider_ValueChanged(object sender, EventArgs e)
        {
            // 更新结束颜色
            endColor = Color.FromArgb(endSlider.Value, endColor.G, endColor.B);
            Refresh();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            // 绘制颜色范围跟踪条
            Graphics g = e.Graphics;
            int barWidth = Width - 40;
            int barHeight = 20;
            int barLeft = (Width - barWidth) / 2;
            int barTop = (Height - barHeight) / 2;
            
            // 绘制颜色范围
            for (int x = barLeft; x < barLeft + barWidth; x++)
            {
                float colorPosition = (float)(x - barLeft) / barWidth;
                Color currentColor = InterpolateColor(startColor, endColor, colorPosition);
                g.DrawLine(new Pen(currentColor), x, barTop, x, barTop + barHeight);
            }
        }

        private Color InterpolateColor(Color startColor, Color endColor, float position)
        {
            int r = (int)(startColor.R + (endColor.R - startColor.R) * position);
            int g = (int)(startColor.G + (endColor.G - startColor.G) * position);
            int b = (int)(startColor.B + (endColor.B - startColor.B) * position);
            return Color.FromArgb(r, g, b);
        }
    }
}