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;

namespace ch11_7
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Label label1;
		private float fAngle;

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

			fAngle = 0;
		}

		/// <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.label1 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(232, 488);
			this.button1.Name = "button1";
			this.button1.TabIndex = 0;
			this.button1.Text = "Angle +";
			this.button1.Click += new System.EventHandler(this.button1_Click);
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(496, 488);
			this.button2.Name = "button2";
			this.button2.TabIndex = 1;
			this.button2.Text = "Angle -";
			this.button2.Click += new System.EventHandler(this.button2_Click);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(352, 488);
			this.label1.Name = "label1";
			this.label1.TabIndex = 2;
			this.label1.Text = "Angle: 0";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(784, 533);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.label1,
																		  this.button2,
																		  this.button1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.OnPaint);
			this.ResumeLayout(false);

		}
		#endregion

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

		void DrawRotatedString(Graphics g, string text, Font font, Brush br,
			Rectangle rect, StringFormat format, float angle)
		{
			Point center = new Point(rect.X+rect.Width/2,
				rect.Y+rect.Height/2);
			g.TranslateTransform(center.X, center.Y);
			g.RotateTransform(angle);
			rect.Offset(-center.X, -center.Y);

			g.DrawString(text, font, br, rect, format);
			g.ResetTransform();
		}

		private void OnPaint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			// Create the font. 
			Font f = new Font("MS Sans Serif", 16);

			Rectangle layoutRect = new Rectangle( new Point(Width/2, Height/2), new Size(200,100));

			string text = "This is a test";

			// Get the format
			StringFormat fmt = new StringFormat();

			// Draw the text
			DrawRotatedString( e.Graphics, "This is a test", f, new SolidBrush(Color.Blue), layoutRect, fmt, fAngle);
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			fAngle += 10;
			this.label1.Text = "Angle: " + fAngle;
			this.Refresh();
		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			fAngle -= 10;
			this.label1.Text = "Angle: " + fAngle;
			this.Refresh();

		}
	}
}