（C#） GDI+简单绘图画直线

GDI+：Graphics Device InterfacePlus也就是图形设备接口,提供了各种丰富的图形图像处理功能;在C#.NET中，使用GDI+处理二维（2D）的图形和图像，使用DirectX处理三维（3D）的图形图像,图形图像处理用到的主要命名空间是System.Drawing：提供了对GDI+基本图形功能的访问，主要有Graphics类、Bitmap类、从Brush类继承的类、Font类、Icon类、Image类、Pen类、Color类等.

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace _10._2._1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Paint(object sender, PaintEventArgs e)        {            //DrawOne(e.Graphics);        }        private void DrawOne(Graphics g)        {            //Graphics g = e.Graphics;            g = this.CreateGraphics();            Pen pen1 = new Pen(Color.Green, 5);            Point[] points =            {                new Point(100,20),                new Point(100,80),                new Point(140,20),                new Point(200,200)            };            g.DrawLines(pen1, points);        }        private void button1_Click(object sender, EventArgs e)        {            Graphics g = this.CreateGraphics();            DrawOne(g);        }    }}