在picturebox中动态创建点/方块

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

namespace DynamicDrawing
{
    public partial class Form1 : Form
    {
        private Graphics graphics;
        private Pen pen;
        private Brush brush;

        public Form1()
        {
            InitializeComponent();
            graphics = pictureBox1.CreateGraphics();
            pen = new Pen(Color.Black);
            brush = new SolidBrush(Color.Red);
        }

        private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
        {
            // 创建点
            graphics.DrawEllipse(pen, e.X, e.Y, 1, 1);

            // 创建方块
            int size = 10; // 方块的大小
            graphics.FillRectangle(brush, e.X - size / 2, e.Y - size / 2, size, size);
        }
    }
}