form1.cs

C#150例

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

namespace Example067_绘制正弦曲线
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		/// <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()
		{
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(320, 221);
			this.Name = "Form1";
			this.Text = "Form1";
			this.Resize += new System.EventHandler(this.Form1_Resize);
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);

		}
		#endregion

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

		private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			int x1,x2;
			double y1,y2;
			double a;
			Pen myPen=new Pen(Color.Blue,3);

			x1=x2=0;
			y1=y2=this.ClientSize.Height/2;
			for (x2= 0;x2<this.ClientSize.Width;x2++)
			{
				a=  2 * Math.PI*x2/this.ClientSize.Width;
				y2= Math.Sin(a);
				y2= (1-y2)*this.ClientSize.Height/2;
				e.Graphics.DrawLine(myPen,x1,(float)y1,x2,(float)y2);
				x1=x2;
				y1=y2;
			}
		}

		private void Form1_Resize(object sender, System.EventArgs e)
		{
			this.Invalidate();
		}
	}
}