using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

//1366*768

namespace PaintTest1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            System.Random r = new System.Random();

            Graphics g;

            g = this.CreateGraphics();

  /*         while(true)

           {

               int x1 = r.Next(0, 1366);

               int y1 = r.Next(0, 200);

               int x2 = x1;

               int y2 = y1 + r.Next(0, 400);

               for(int i=y1;i<=y2;i++)

               {

                   Pen greenPen = new Pen(Color.Green, r.Next(1, 15));

                   g.DrawLine(greenPen, x1, y1, x2, y2);

               }

           } */

            for (int i = 0; i < 5000; i++)

            {

                    Pen whitePen = new Pen(Color.FromArgb(r.Next(0,255), r.Next(0,255), r.Next(0,255)),8);

                   int x1 = r.Next(100,300);

                   int y1 = r.Next(100, 500);

                   int x2 = r.Next(100, 300);

                   int y2 = r.Next(100, 500);

                   // int x1 = 500;

                   // int y1 = 500;

                   // int x2 = i;

                   // int y2 = 1000 * 1000 - i * i;

                    g.DrawLine(whitePen, x1, y1, x2, y2);

            }

            for (int i = 0; i < 5000; i++)

            {

                Pen whitePen = new Pen(Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)),9);

                int x1 = 500; //650-900

                int y1 = 300; //100-500

                int x2 = r.Next(400, 600);

                int y2 = r.Next(100, 500);

                // int x1 = 500;

                // int y1 = 500;

                // int x2 = i;

                // int y2 = 1000 * 1000 - i * i;

                g.DrawLine(whitePen, x1, y1, x2, y2);

            }

            for (int i = 0; i < 5000; i++)

            {

                Pen whitePen = new Pen(Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)),10);

                int x1 = 900; //650-900

                int y1 = 100; //100-500

                int x2 = r.Next(700, 900);

                int y2 = r.Next(100, 500);

                // int x1 = 500;

                // int y1 = 500;

                // int x2 = i;

                // int y2 = 1000 * 1000 - i * i;

                g.DrawLine(whitePen, x1, y1, x2, y2);

            }

            for (int i = 0; i < 5000; i++)

            {

                Pen whitePen = new Pen(Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)),11);

                int x1 = 1000; //650-900

                int y1 = 500; //100-500

                int x2 = r.Next(1000, 1200);

                int y2 = r.Next(100, 500);

                // int x1 = 500;

                // int y1 = 500;

                // int x2 = i;

                // int y2 = 1000 * 1000 - i * i;

                g.DrawLine(whitePen, x1, y1, x2, y2);

            }

            for (int i = 0; i < 5000; i++)

            {

                Pen whitePen = new Pen(Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)),12);

                int x1 = r.Next(100,1200); ; //650-900

                int y1 = r.Next(600, 700); ; //100-500

                int x2 = r.Next(100, 1200);

                int y2 = r.Next(600, 700);

                // int x1 = 500;

                // int y1 = 500;

                // int x2 = i;

                // int y2 = 1000 * 1000 - i * i;

                g.DrawLine(whitePen, x1, y1, x2, y2);

            }

            for (int i = 0; i < 5000; i++)

            {

                Pen whitePen = new Pen(Color.FromArgb(r.Next(0, 255), r.Next(0, 255), r.Next(0, 255)),r.Next(1,15));

                int x1 = r.Next(100, 1200); ; //650-900

                int y1 = r.Next(600, 700); ; //100-500

                int x2 = r.Next(100, 1200);

                int y2 = r.Next(600, 700);

                // int x1 = 500;

                // int y1 = 500;

                // int x2 = i;

                // int y2 = 1000 * 1000 - i * i;

                g.DrawLine(whitePen, x1, y1, x2, y2);

            }

        }

    }

}

效果图<这是一种动态的画图,效果还行,以下将改为数字雨的模式測试,相关算法正在调试.