本文实例讲述了C#绘制中国国旗的方法。分享给大家供大家参考。具体如下：

程序运行截图：

中国国旗被定义在《GB：12982-2004》中，以下是从维基百科条目中华人民共和国国旗中截的一张图，标出了五颗星大致的位置。

建立一个空的C# Windows窗体应用程序，窗体取名FormMain，在窗体中放一个PictureBox，取名为picFlagOfChina，并将Dock属性设置为Fill。程序代码中用到了窗体事件Load和Resize，程序代码如下：

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 ChineseFlag{ public partial class FormMain : Form { public FormMain() { InitializeComponent(); } private void FormMain_Load(object sender, EventArgs e) { PaintFlag(); } //修改窗体大小时发生 private void FormMain_Resize(object sender, EventArgs e) { PaintFlag(); } /// <summary> /// 在图片框 picFlagOfChina 中绘制国旗 /// </summary> private void PaintFlag() { picFlagOfChina.BackColor = Color.Red; picFlagOfChina.Image = new Bitmap( picFlagOfChina.Width, picFlagOfChina.Height); Graphics g = Graphics.FromImage(picFlagOfChina.Image); Point[] p = new Point[] { }; p = PentacleA(this.Width, this.Height); g.FillPolygon(Brushes.Yellow, p); p = PentacleB(this.Width, this.Height); g.FillPolygon(Brushes.Yellow, p); p = PentacleC(this.Width, this.Height); g.FillPolygon(Brushes.Yellow, p); p = PentacleD(this.Width, this.Height); g.FillPolygon(Brushes.Yellow, p); p = PentacleE(this.Width, this.Height); g.FillPolygon(Brushes.Yellow, p); } //大星 private Point[] PentacleA(int width, int height) { return new Point[] { new Point((int)(width / 30.0 * 5), (int)(height / 20.0 * 2)), new Point((int)(width / 30.0 * 5.7), (int)(height / 20.0 * 4.1)), new Point((int)(width / 30.0 * 8), (int)(height / 20.0 * 4.1)), new Point((int)(width / 30.0 * 6), (int)(height / 20.0 * 5.3)), new Point((int)(width / 30.0 * 6.8), (int)(height / 20.0 * 7.3)), new Point((int)(width / 30.0 * 5), (int)(height / 20.0 * 6.1)), new Point((int)(width / 30.0 * 3.2), (int)(height / 20.0 * 7.3)), new Point((int)(width / 30.0 * 4), (int)(height / 20.0 * 5.3)), new Point((int)(width / 30.0 * 2), (int)(height / 20.0 * 4.1)), new Point((int)(width / 30.0 * 4.3), (int)(height / 20.0 * 4.1)), }; } //工人星 private Point[] PentacleB(int width, int height) { return new Point[] { new Point((int)(width / 30.0 * 9.2), (int)(height / 20.0 * 2.5)), new Point((int)(width / 30.0 * 9.6), (int)(height / 20.0 * 2)), new Point((int)(width / 30.0 * 9.3), (int)(height / 20.0 * 1.4)), new Point((int)(width / 30.0 * 9.95), (int)(height / 20.0 * 1.7)), new Point((int)(width / 30.0 * 10.45), (int)(height / 20.0 * 1.1)), new Point((int)(width / 30.0 * 10.36), (int)(height / 20.0 * 1.85)), new Point((int)(width / 30.0 * 11), (int)(height / 20.0 * 2.1)), new Point((int)(width / 30.0 * 10.34), (int)(height / 20.0 * 2.25)), new Point((int)(width / 30.0 * 10.3), (int)(height / 20.0 * 2.95)), new Point((int)(width / 30.0 * 9.9), (int)(height / 20.0 * 2.3)) }; } //农民星 private Point[] PentacleC(int width, int height) { return new Point[] { new Point((int)(width / 30.0 * 11), (int)(height / 20.0 * 4.1)), new Point((int)(width / 30.0 * 11.65), (int)(height / 20.0 * 3.8)), new Point((int)(width / 30.0 * 11.55), (int)(height / 20.0 * 3.05)), new Point((int)(width / 30.0 * 12.05), (int)(height / 20.0 * 3.6)), new Point((int)(width / 30.0 * 12.7), (int)(height / 20.0 * 3.3)), new Point((int)(width / 30.0 * 12.35), (int)(height / 20.0 * 3.98)), new Point((int)(width / 30.0 * 12.9), (int)(height / 20.0 * 4.5)), new Point((int)(width / 30.0 * 12.1), (int)(height / 20.0 * 4.3)), new Point((int)(width / 30.0 * 11.8), (int)(height / 20.0 * 5)), new Point((int)(width / 30.0 * 11.7), (int)(height / 20.0 * 4.2)) }; } //小资星 private Point[] PentacleD(int width, int height) { return new Point[] { new Point((int)(width / 30.0 * 11.1), (int)(height / 20.0 * 6.7)), new Point((int)(width / 30.0 * 11.8), (int)(height / 20.0 * 6.7)), new Point((int)(width / 30.0 * 12), (int)(height / 20.0 * 6)), new Point((int)(width / 30.0 * 12.2), (int)(height / 20.0 * 6.7)), new Point((int)(width / 30.0 * 12.9), (int)(height / 20.0 * 6.7)), new Point((int)(width / 30.0 * 12.35), (int)(height / 20.0 * 7.1)), new Point((int)(width / 30.0 * 12.55), (int)(height / 20.0 * 7.8)), new Point((int)(width / 30.0 * 12), (int)(height / 20.0 * 7.4)), new Point((int)(width / 30.0 * 11.45), (int)(height / 20.0 * 7.8)), new Point((int)(width / 30.0 * 11.65), (int)(height / 20.0 * 7.1)) }; } //民资星(工人星向下平移7个单位) private Point[] PentacleE(int width, int height) { return new Point[] { new Point((int)(width / 30.0 * 9.2), (int)(height / 20.0 * 9.5)), new Point((int)(width / 30.0 * 9.6), (int)(height / 20.0 * 9)), new Point((int)(width / 30.0 * 9.3), (int)(height / 20.0 * 8.4)), new Point((int)(width / 30.0 * 9.95), (int)(height / 20.0 * 8.7)), new Point((int)(width / 30.0 * 10.45), (int)(height / 20.0 * 8.1)), new Point((int)(width / 30.0 * 10.36), (int)(height / 20.0 * 8.85)), new Point((int)(width / 30.0 * 11), (int)(height / 20.0 * 9.1)), new Point((int)(width / 30.0 * 10.34), (int)(height / 20.0 * 9.25)), new Point((int)(width / 30.0 * 10.3), (int)(height / 20.0 * 9.95)), new Point((int)(width / 30.0 * 9.9), (int)(height / 20.0 * 9.3)) }; } }}

希望本文所述对大家的C#程序设计有所帮助。