在图像中动态添加文字

【核心代码】

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

namespace Image
{
	/// <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;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.FontDialog fontDialog1;
		private System.Windows.Forms.SaveFileDialog saveFileDialog1;
		/// <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 窗体设计器生成的代码
		/// <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.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.button3 = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.fontDialog1 = new System.Windows.Forms.FontDialog();
			this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
			this.SuspendLayout();
			// 
			// pictureBox1
			// 
			this.pictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			this.pictureBox1.Location = new System.Drawing.Point(8, 8);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(336, 152);
			this.pictureBox1.TabIndex = 0;
			this.pictureBox1.TabStop = false;
			this.pictureBox1.MouseUp  = new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp);
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(8, 184);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(72, 23);
			this.button1.TabIndex = 1;
			this.button1.Text = "浏览图像";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(8, 232);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(72, 23);
			this.button2.TabIndex = 2;
			this.button2.Text = "保存图像";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// openFileDialog1
			// 
			this.openFileDialog1.Filter = "Image files (JPeg, Gif, Bmp, etc.)|*.jpg;*.jpeg;*.gif;*.bmp;*.tif; *.tiff; *.png|"  
				" JPeg files (*.jpg;*.jpeg)|*.jpg;*.jpeg |GIF files (*.gif)|*.gif |BMP files (*.b"  
				"mp)|*.bmp|Tiff files (*.tif;*.tiff)|*.tif;*.tiff|Png files (*.png)| *.png |All f"  
				"iles (*.*)|*.*";
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(8, 208);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(72, 23);
			this.button3.TabIndex = 3;
			this.button3.Text = "设置文字";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(16, 168);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(72, 16);
			this.label1.TabIndex = 4;
			this.label1.Text = "文字内容：";
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(80, 168);
			this.textBox1.Multiline = true;
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(264, 88);
			this.textBox1.TabIndex = 5;
			this.textBox1.Text = "中华人民共和国";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(352, 262);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.pictureBox1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示在图像中添加文字";
			this.ResumeLayout(false);

		}
		#endregion

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

		private void button1_Click(object sender, System.EventArgs e)
		{//打开图像文件并显示
			this.openFileDialog1.ShowDialog();
			if(this.openFileDialog1.FileName.Trim()=="")
				return;
			try
			{
				this.pictureBox1.Image=System.Drawing.Bitmap.FromFile(this.openFileDialog1.FileName);
			}
			catch(Exception Err)
			{
				MessageBox.Show(this,"打开图像文件错误！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}
        private void button3_Click(object sender, System.EventArgs e)
		{//设置文字
			fontDialog1.ShowColor = true;
			if(this.fontDialog1.ShowDialog()==DialogResult.OK)
			{
				textBox1.Font = fontDialog1.Font ;
				textBox1.ForeColor = fontDialog1.Color;
				MessageBox.Show("请用鼠标单击图像中的文字显示位置！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}			
		}
		
		private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
		{//显示图像文字
			if(this.pictureBox1.Image.Height<1)
			{
				return;
			}
			Graphics g = Graphics.FromImage(this.pictureBox1.Image);
			SolidBrush MyBrush = new SolidBrush(this.textBox1.ForeColor);   
			g.DrawString (this.textBox1.Text, this.textBox1.Font, MyBrush, e.X, e.Y);
			this.pictureBox1.Refresh();
		}

		private void button2_Click(object sender, System.EventArgs e)
		{//保存图像文字
			if(MessageBox.Show("真的需要保存图像文字效果吗？","信息提示",MessageBoxButtons.YesNo,MessageBoxIcon.Information)==DialogResult.No)
				return;
			if(this.saveFileDialog1.ShowDialog()==DialogResult.Cancel)
				return;
			string FileName=this.saveFileDialog1.FileName;
			try
			{
				this.pictureBox1.Image.Save(FileName ".jpg",System.Drawing.Imaging.ImageFormat.Jpeg);		
			}
			catch(Exception Err)
			{
				MessageBox.Show("保存图像文件出现错误：" Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}
	}
}