在Winform中随机生成100个小圆，当鼠标移上去时，显示当前是哪一个圆（索引或坐标），坐等大家回复！！

原码如下：
using System;
using System.Drawing;
using System.Windows.Forms;

namespace DrawDeom
{
    public partial class Form2 : Form
    {
        private Point[] aDraw = new Point[100];
        System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();

        public Form2()
        {
            InitializeComponent();
            Run100();
        }

        private void Run100()
        {
            System.Random rnd = new Random();

            int x, y;

            for (int i = 0; i < aDraw.Length; i++)
            {
                x = rnd.Next(this.Width);
                y = rnd.Next(this.Height);
                aDraw[i].X = x;
                aDraw[i].Y = y;

                path.AddEllipse(x, y, 5, 5);
            }
        }

        private void Draw(Graphics _g)
        {
            Pen redPen = new Pen(Color.Red, 1);
            _g.DrawPath(redPen, path);
        }

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

        protected override void OnMouseMove(MouseEventArgs e)
        {
            Point p = System.Windows.Forms.Control.MousePosition;
            toolStripStatusLabel1.Text = string.Format("X:{0}-Y{1}", p.X, p.Y);
            p = this.PointToClient(p);
            if (path.IsVisible(p.X, p.Y))
            {
                toolStripStatusLabel1.ForeColor = Color.Red;
                toolTip1.ToolTipTitle = "标题";
               //显示当前圆的索引或左上角坐标
                toolTip1.Show("当前图形：XX", this);
            }
            else
            {
                toolStripStatusLabel1.ForeColor = Color.Black;
                toolTip1.Hide(this);
            }
        }
    }
}