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 WindowsFormsApplication1{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { //一张纸 一根笔 一个人 两个点 } //画直线 private void Form1_Paint(object sender, PaintEventArgs e) { Graphics gp = this.CreateGraphics(); Pen p = new Pen(Color.Blue); Point p1 = new Point(100, 100); Point p2 = new Point(100, 300); gp.DrawLine(p, p1, p2); } //画多线直线 private void button1_Click(object sender, EventArgs e) { //创建一个GDI+ 对象 Graphics g = this.CreateGraphics(); //创建画笔对象 Pen pen = new Pen(Color.Blue); //创建两个点 Point p1 = new Point(100, 100); Point p2 = new Point(30, 400); //在画板中用pen在p1和p2两个点之间画一条直线 g.DrawLine(pen, p1, p2); //pos为point数组，在画板中画多条直线 Point p3 = new Point(300, 120); Point p4 = new Point(15, 200); Point[] pos = { p1, p2, p3, p4 }; g.DrawLines(pen, pos); } //画矩形 private void button2_Click(object sender, EventArgs e) { //创建GDI+对象 Graphics gp = this.CreateGraphics(); //创建矩形对象 左上角度座标 宽 高 Rectangle rec = new Rectangle(new Point(100, 10), new Size(100, 300)); gp.DrawRectangle(new Pen(Color.Blue), rec); } //填充矩形 private void button3_Click(object sender, EventArgs e) { //创建GDI+对象 Graphics gp = this.CreateGraphics(); //给定要填充的矩形对象 Rectangle rec = new Rectangle(new Point(100, 10), new Size(100, 300)); //填充颜色 获取系统颜色 给定要填充的矩形 gp.FillRectangle(Brushes.DarkGreen, rec); } //画扇形，并填充 private void button4_Click(object sender, EventArgs e) { //创建GDI+对象 Graphics gp = this.CreateGraphics(); //给定要填充的矩形对象 Rectangle rec = new Rectangle(new Point(100, 10), new Size(100, 300)); //绘制扇形 pen对象 矩形 右角 左角度 gp.DrawPie(new Pen(Color.Red), rec, 60, 60); //填充扇形 获取系统对象 矩形 右角 左角度 gp.FillPie(Brushes.DarkGreen, rec, 60, 60); } //画文字 private void button5_Click(object sender, EventArgs e) { //创建GDI+对象 Graphics g = this.CreateGraphics(); //绘制文本 文本 字体样式： 字体 字号 样式粗？斜？... 获取系统颜色 绘制到的座标点 g.DrawString("中国您好!", new Font("华文行楷", 20, FontStyle.Italic), Brushes.Red, new Point(300, 300)); } //验证码 private void pictureBox1_Click(object sender, EventArgs e) { //生成1到9之间的4个随机数 Random r = new Random(); string str = ""; for (int i = 0; i < 4; i++) { int rNumber = r.Next(0, 10); //累加到空字符串中 str += rNumber; } //创建GDI+对象 //创建图片对象， 指定 宽 和 高 Bitmap bm = new Bitmap(115,30);; //从指定的Image对象创建新的Grapics画板 Graphics g = Graphics.FromImage(bm); //数组存放字体 string[] fonts = {"黑体","微软雅黑","隶书","楷体"}; //数组存放颜色 Color[] colors = {Color.Red,Color.Yellow,Color.Pink,Color.Purple}; //画字 for (int i = 0; i < 4; i++) { //指定座标 Point p = new Point(i*20,0); //画文字 g.DrawString(str[i].ToString(), new Font(fonts[i], 20, FontStyle.Italic), new SolidBrush(colors[i]),p); } //画线 for (int j = 0; j < 16; j++) { Point p1 = new Point(r.Next(0,bm.Width),r.Next(bm.Height)); Point p2 = new Point(r.Next(0,bm.Width),r.Next(0,bm.Height)); g.DrawLine(new Pen(Color.Green), p1, p2); } //画像素点 for (int i = 0; i < 100; i++) { Point p1 = new Point(r.Next(0,bm.Width),r.Next(bm.Height)); Point p2 = new Point(r.Next(0,bm.Width),r.Next(0,bm.Height)); bm.SetPixel(p1.X, p1.Y, Color.Black); } //将bm这个图片直接镶嵌到pictureBox上 pictureBox1.Image = bm; } }}
