C#绘制中国国旗的方法

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*条目*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。