form1.cs

C#150例

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;  

namespace Example043_在一个区域中剪辑
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			// Create a path that consists of a single polygon.
			Point[] polyPoints = {
									 new Point(10, 10),
									 new Point(150, 10), 
									 new Point(100, 75),
									 new Point(100, 150)};
			GraphicsPath path = new GraphicsPath();
			path.AddPolygon(polyPoints);

			// Construct a region based on the path.
			Region region = new Region(path);

			// Draw the outline of the region.
			Pen pen = Pens.Black;
			e.Graphics.DrawPath(pen, path);

			// Set the clipping region of the Graphics object.
			e.Graphics.SetClip(region, CombineMode.Replace);

			// Draw some clipped strings.
			FontFamily fontFamily = new FontFamily("Arial");
			Font font = new Font(
				fontFamily,
				36, FontStyle.Bold,
				GraphicsUnit.Pixel);
			SolidBrush solidBrush = new SolidBrush(Color.FromArgb(255, 255, 0, 0));
			//e.Graphics.Clip=region;
			e.Graphics.DrawString(
				"A Clipping Region",
				font, solidBrush,
				new PointF(15, 25));

			e.Graphics.DrawString(
				"A Clipping Region",
				font,
				solidBrush,
				new PointF(15, 68));
		}
	}
}