form1.cs

《c#技术内幕代码》

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

namespace CH11_8
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.PictureBox pictureBox1;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.button1 = new System.Windows.Forms.Button();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(32, 280);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(264, 32);
			this.button1.TabIndex = 0;
			this.button1.Text = "Generate Image";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(32, 320);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(264, 32);
			this.button2.TabIndex = 1;
			this.button2.Text = "Load Image";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(128, 368);
			this.button3.Name = "button3";
			this.button3.TabIndex = 3;
			this.button3.Text = "&Close";
			this.button3.Click += new System.EventHandler(this.button3_Click);
			// 
			// pictureBox1
			// 
			this.pictureBox1.Location = new System.Drawing.Point(24, 16);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(272, 240);
			this.pictureBox1.TabIndex = 4;
			this.pictureBox1.TabStop = false;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(352, 405);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.pictureBox1,
																		  this.button3,
																		  this.button2,
																		  this.button1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button3_Click(object sender, System.EventArgs e)
		{
            Close();
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			// Initialize the graphic objects we need
            Bitmap theBitmap = null;
            Graphics grfx = null ;

            try 
            {
               Font theFont = new Font("MS Sans Serif", 12);

               // calculate size of the string.
               theBitmap = new Bitmap(1,1,PixelFormat.Format32bppArgb);

			   // Create the graphics object so we can draw
              grfx = Graphics.FromImage(theBitmap);

			  // Build the width of the image from the string
              SizeF stringSize = grfx.MeasureString("I'm an Image!", theFont);
              int nWidth = (int)stringSize.Width;
              int nHeight = (int)stringSize.Height;
              grfx.Dispose();
              theBitmap.Dispose();
      
			  // Recreate it with the right dimensions
              theBitmap = new Bitmap(nWidth,nHeight,PixelFormat.Format32bppArgb);
              grfx = Graphics.FromImage(theBitmap);
              grfx.FillRectangle(new SolidBrush(Color.Blue), 
				  new Rectangle(0,0,nWidth,nHeight));

              grfx.DrawString("I'm an image", theFont, new SolidBrush(Color.White), 0, 0);
              theBitmap.Save("c:\\matt\\c#\\ch11_8.png", ImageFormat.Png);
           } 
           catch (Exception exc)
           {
                MessageBox.Show(this, exc.ToString());
           }
           finally 
           {
              if (grfx != null) 
				  grfx.Dispose();
              if (theBitmap != null) 
				  theBitmap.Dispose();
           }
        }

		private void button2_Click(object sender, System.EventArgs e)
		{
			this.pictureBox1.Image = Image.FromFile("c:\\matt\\c#\\ch11_8.png");
		}
	}
}