form1.cs

Visual C#2005程序设计教程

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

namespace 抽象类_计算面积
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.TextBox textBox1;
		private System.Windows.Forms.TextBox textBox2;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		/// <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.textBox1 = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.button3 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // textBox1
            // 
            this.textBox1.Location = new System.Drawing.Point(128, 62);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(133, 25);
            this.textBox1.TabIndex = 0;
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(384, 62);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(133, 25);
            this.textBox2.TabIndex = 1;
            // 
            // label1
            // 
            this.label1.Location = new System.Drawing.Point(11, 41);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(106, 62);
            this.label1.TabIndex = 2;
            this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
            // 
            // label2
            // 
            this.label2.Location = new System.Drawing.Point(277, 51);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(107, 52);
            this.label2.TabIndex = 3;
            this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
            // 
            // label3
            // 
            this.label3.Location = new System.Drawing.Point(107, 123);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(245, 52);
            this.label3.TabIndex = 4;
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(21, 195);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(150, 30);
            this.button1.TabIndex = 5;
            this.button1.Text = "计算圆面积";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(203, 195);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(149, 30);
            this.button2.TabIndex = 6;
            this.button2.Text = "计算矩形面积";
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // button3
            // 
            this.button3.Location = new System.Drawing.Point(384, 195);
            this.button3.Name = "button3";
            this.button3.Size = new System.Drawing.Size(149, 30);
            this.button3.TabIndex = 7;
            this.button3.Text = "计算三角形面积";
            this.button3.Click += new System.EventHandler(this.button3_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(8, 18);
            this.ClientSize = new System.Drawing.Size(554, 285);
            this.Controls.Add(this.button3);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.textBox1);
            this.Name = "Form1";
            this.Text = "几何图形面积";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

		}
		#endregion

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

		private void Form1_Load(object sender, System.EventArgs e)
		{
			label1.Text="圆半径：\n矩形长：\n三角形底：";
			label2.Text="矩形宽：\n三角形高：";
			label3.Text="面积为：\n    ";
		}

		private void button1_Click(object sender, System.EventArgs e)
		{
			label3.Text="面积为：\n    ";
			float r=Convert.ToSingle(textBox1.Text);
			Circularity C=new Circularity(r);
			label3.Text="圆"+label3.Text+Area(C).ToString( );

		}

		private void button2_Click(object sender, System.EventArgs e)
		{
			label3.Text="面积为：\n    ";
			float Length=Convert.ToSingle(textBox1.Text);
			float Width=Convert.ToSingle(textBox2.Text);
			Rectangle R=new Rectangle(Length,Width);
			label3.Text="矩形"+label3.Text+Area(R).ToString( );
		}

		private void button3_Click(object sender, System.EventArgs e)
		{
			label3.Text="面积为：\n    ";
			float Hemline=Convert.ToSingle(textBox1.Text);
			float High=Convert.ToSingle(textBox2.Text);
			Triangle T=new Triangle(Hemline,High);
			label3.Text="三角形"+label3.Text+Area(T).ToString( );
		}
	}
	public abstract class PlaneGraphics    //平面图形抽象类
	{
		protected float x;
		protected float y;
		public PlaneGraphics(float X,float Y)
		{
			x=X;
			y=Y;
		}
		public abstract double Area( );    //抽象方法
	}
	public class Circularity:PlaneGraphics    //圆派生类
	{
		public Circularity(float x):base(x,0){ }
		public override double Area( )    //重载抽象方法
		{
			return (double)x*x*3.14;
		}
	}
	public class Rectangle:PlaneGraphics
	{
		public Rectangle(float x,float y):base(x,y){ }
		public override double Area( )
		{
			return (double)x*y;
		}
	}
	public class Triangle:PlaneGraphics
	{
		public Triangle(float x,float y):base(x,y){ }
		public override double Area( )
		{
			return (double)x*y/2;
		}
	}
}