C#要实现简单的画图功能可以利用Graphics这个类，要使用Graphics必需using命名空间System.Drawing（此名明空间下都是关于图形的操作）。首先创建画布：
Bitmap bmp = new Bitmap(1000, 800); Graphics g = Graphics.FromImage(bmp);
清除画布的背景色，并且指定颜色填充：
g.Clear(Color.White);
开始画图：
//画矩形
g.DrawRectangle(new Pen(Color.Red), new Rectangle(0, 0, 600, 400));
//填充扇形
g.FillPie(new SolidBrush(Color.Red), new Rectangle(100, 80, 200, 200), 0, 100);
//在画布上写文字
g.DrawString("A", new Font("Times New Roman", 16), new SolidBrush(Color.Black), 250, 210);
下面给出完整代码：
1 public class GraphicsController : Controller
2 {
3 public ActionResult Index()
4 {
5 return View();
6 }
7 [HttpGet]
8 public ActionResult CreateGraphics()
9 {
10 Bitmap bmp = new Bitmap(1000, 800);
11 //画布
12 Graphics g = Graphics.FromImage(bmp);
13 //清除画布背景色，并填充指定色
14 g.Clear(Color.White);
15 //画矩形
16 g.DrawRectangle(new Pen(Color.Red), new Rectangle(0, 0, 600, 400));
17 //画刷
18 Brush bs = new SolidBrush(Color.Blue);
19 //填充扇形
20 g.FillPie(new SolidBrush(Color.Red), new Rectangle(100, 80, 200, 200), 0, 100);
21 g.FillPie(bs, new Rectangle(100, 80, 200, 200), 100, 100);
22 g.DrawPie(new Pen(bs), new Rectangle(100, 80, 200, 200), 200, 100);//画扇形
23 g.FillPie(new SolidBrush(Color.HotPink), new Rectangle(100, 80, 200, 200), 300, 60);
24 g.DrawString("A", new Font("Times New Roman", 16), new SolidBrush(Color.Black), 250, 210);
25 //抗锯齿
26 g.SmoothingMode = SmoothingMode.AntiAlias;
27 MemoryStream ms = new MemoryStream();
28 try
29 {
30 bmp.Save(ms, ImageFormat.Gif);
31 return File(ms.ToArray(), @"image/Gif");
32 }
33 catch (Exception)
34 {
35 return null;
36 }
37 }
38 }
后台
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
<div>
<img src="/Bitmap/CreateGraphics" width="1000" height="800" />
</div>
</body>
</html>
效果图（好像有点简陋(╯▽╰ )）：
最后推荐一些前辈的总结（比我强太多了）：
http://www.cnblogs.com/Jerry-Chou/archive/2012/03/20/2408064.html
http://www.cnblogs.com/Jerry-Chou/archive/2012/03/21/2409590.html
http://www.cnblogs.com/beyond0309/archive/2008/04/15/1155003.html验证码也可以用这种方式生成
时间： 2024-11-10 08:32:38