form1.cs

苏金明编写的《用VB.NET和VC#.NET开发交互式CAD系统》一书的源代码

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

namespace Graph
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.PictureBox pictureBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		/// <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.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// pictureBox1
			// 
			this.pictureBox1.BackColor = System.Drawing.Color.White;
			this.pictureBox1.Location = new System.Drawing.Point(184, 24);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(200, 216);
			this.pictureBox1.TabIndex = 0;
			this.pictureBox1.TabStop = false;
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(48, 272);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(120, 48);
			this.button1.TabIndex = 1;
			this.button1.Text = "在窗体上绘图";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(232, 272);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(120, 48);
			this.button2.TabIndex = 2;
			this.button2.Text = "在图片框上绘图";
			this.button2.Click += new System.EventHandler(this.button2_Click_1);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(408, 342);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.button2,
																		  this.button1,
																		  this.pictureBox1});
			this.Name = "Form1";
			this.Text = "Graphics";
			this.ResumeLayout(false);

		}
		#endregion

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

		protected override void OnPaint(PaintEventArgs e)
		{
			Graphics g = e.Graphics;
			float x, y,w, h;
			x = pictureBox1.Left - 2;
			y = pictureBox1.Top - 2;
			w = pictureBox1.Width + 4;
			h = pictureBox1.Height + 4;
			Pen pen=new Pen(Color.Red, 2);
			g.DrawRectangle(pen, x, y, w, h);

			GraphicsPath gp=new GraphicsPath();
			gp.AddRectangle(new Rectangle(10, 10, 100, 100));
		}

		private void button1_Click(object sender, EventArgs e)
		{
			Graphics g= this.CreateGraphics();
			g.FillEllipse(Brushes.Blue, 10, 20, 50, 100);
		}

		private void button2_Click_1(object sender, EventArgs e)
		{

			Graphics g= pictureBox1.CreateGraphics();
			g.FillEllipse(Brushes.Blue, 10, 20, 50, 100);
		}

	}
}