form1.cs

原代码详细说明是关于c++方面的希望可以帮助大家使用

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

namespace Exam5_1_1
{
	/// <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 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()
		{
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(280, 181);
			this.Name = "Form1";
			this.Text = "Form1";
			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)
		{
          /*
			Graphics g=e.Graphics;
			Pen myPen=new Pen(Color.Black);
			g.DrawRectangle(myPen,10,10,100,50);
			g.TranslateTransform(60,60);//新的坐标原点
			g.DrawRectangle(myPen,10,10,100,50);
			g.RotateTransform(30.0f);
			g.DrawRectangle(myPen,10,10,100,50);
			g.ScaleTransform(0.5f,0.5f);//g.PageScale=0.5f;
			g.DrawRectangle(myPen,10,10,100,50);
		  */	
			
			Graphics g=e.Graphics;
			Pen myPen=new Pen(Color.Black,1/g.DpiX);
			g.PageUnit=GraphicsUnit.Inch;//设置坐标单位
		    //设置坐标原点
			g.TranslateTransform(this.ClientSize.Width/2.0f/g.DpiX,this.ClientSize.Height/2.0f/g.DpiX);//新的坐标原点
			g.ScaleTransform(1,-1);//改变方向
			//画坐标轴
			g.DrawLine(myPen,-this.ClientSize.Width/2.0f/g.DpiX,0,this.ClientSize.Width/2.0f/g.DpiX,0);
			g.DrawLine(myPen,0,this.ClientSize.Height/2.0f/g.DpiX,0,-this.ClientSize.Height/2.0f/g.DpiX);
			g.DrawLine(myPen,-0.05f,this.ClientSize.Height/2.0f/g.DpiX-0.1f,0,this.ClientSize.Height/2.0f/g.DpiX);
			g.DrawLine(myPen,0.05f,this.ClientSize.Height/2.0f/g.DpiX-0.1f,0,this.ClientSize.Height/2.0f/g.DpiX);
			g.DrawLine(myPen,this.ClientSize.Width/2.0f/g.DpiX-0.1f,0.05f,this.ClientSize.Width/2.0f/g.DpiX,0);
			g.DrawLine(myPen,this.ClientSize.Width/2.0f/g.DpiX-0.1f,-0.05f,this.ClientSize.Width/2.0f/g.DpiX,0);
	     	
			g.DrawEllipse(myPen,-0.5f,-0.5f,1,1);//注意：左上角，变成右下角
  	
		}
	}
}