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 Example062__多种风格的端点
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ListBox listBox1;
		private System.Windows.Forms.ListBox listBox2;
		/// <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()
		{
			this.listBox1 = new System.Windows.Forms.ListBox();
			this.listBox2 = new System.Windows.Forms.ListBox();
			this.SuspendLayout();
			// 
			// listBox1
			// 
			this.listBox1.ItemHeight = 12;
			this.listBox1.Items.AddRange(new object[] {
														  "箭头状锚头帽",
														  "菱形锚头帽",
														  "平线帽",
														  "没有帽",
														  "圆线帽",
														  "圆锚头帽",
														  "方线帽",
														  "方锚头帽",
														  "三角线帽"});
			this.listBox1.Location = new System.Drawing.Point(8, 8);
			this.listBox1.Name = "listBox1";
			this.listBox1.Size = new System.Drawing.Size(96, 112);
			this.listBox1.TabIndex = 0;
			this.listBox1.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);
			// 
			// listBox2
			// 
			this.listBox2.ItemHeight = 12;
			this.listBox2.Items.AddRange(new object[] {
														  "箭头状锚头帽",
														  "菱形锚头帽",
														  "平线帽",
														  "没有帽",
														  "圆线帽",
														  "圆锚头帽",
														  "方线帽",
														  "方锚头帽",
														  "三角线帽"});
			this.listBox2.Location = new System.Drawing.Point(112, 8);
			this.listBox2.Name = "listBox2";
			this.listBox2.Size = new System.Drawing.Size(96, 112);
			this.listBox2.TabIndex = 1;
			this.listBox2.SelectedIndexChanged += new System.EventHandler(this.listBox2_SelectedIndexChanged);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(216, 157);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.listBox2,
																		  this.listBox1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
		Pen MyPen;
		Graphics g;
		private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			//绘制直线
			g.DrawLine(MyPen,10,150,200,150); 	
		}

		private void listBox1_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			//设置起始点的帽样式
			switch(this.listBox1.SelectedIndex)
			{
				case 0:
					MyPen.StartCap=LineCap.ArrowAnchor;
					break;
				case 1:
					MyPen.StartCap=LineCap.DiamondAnchor; 
					break;
				case 2:
					MyPen.StartCap=LineCap.Flat; 
					break;
				case 3:
					MyPen.StartCap=LineCap.NoAnchor; 
					break;
				case 4:
					MyPen.StartCap=LineCap.Round; 
					break;
				case 5:
					MyPen.StartCap=LineCap.RoundAnchor; 
					break;
				case 6:
					MyPen.StartCap=LineCap.Square;
					break;
				case 7:
					MyPen.StartCap=LineCap.SquareAnchor; 
					break;
				case 8:
					MyPen.StartCap=LineCap.Triangle; 
					break;
			}

			//启发Paint事件并执行其中的代码
			this.Invalidate(); 
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
			g=this.CreateGraphics();

			//创建Pen对象并设置起始点和结束点的帽样式
			MyPen=new Pen(Color.Blue,5);
			MyPen.StartCap=LineCap.NoAnchor;
			MyPen.EndCap=LineCap.NoAnchor; 
			
		}

		private void listBox2_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			//设置结束点的帽样式
			switch(this.listBox2.SelectedIndex)
			{
				case 0:
					MyPen.EndCap=LineCap.ArrowAnchor;
					break;
				case 1:
					MyPen.EndCap=LineCap.DiamondAnchor; 
					break;
				case 2:
					MyPen.EndCap=LineCap.Flat; 
					break;
				case 3:
					MyPen.EndCap=LineCap.NoAnchor; 
					break;
				case 4:
					MyPen.EndCap=LineCap.Round; 
					break;
				case 5:
					MyPen.EndCap=LineCap.RoundAnchor; 
					break;
				case 6:
					MyPen.EndCap=LineCap.Square;
					break;
				case 7:
					MyPen.EndCap=LineCap.SquareAnchor; 
					break;
				case 8:
					MyPen.EndCap=LineCap.Triangle; 
					break;
			}

			//启发Paint事件并执行其中的代码
			this.Invalidate(); 
		}
	}
}