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   源码介绍

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Autodesk.AutoCAD.Interop;

namespace huaxian
{
    public partial class Form1 : Form
    {
        private AcadApplication a = new AcadApplication();
        public Form1()
        {
            InitializeComponent();
            a.Visible = true;
           
        }
        //private AcadApplication a;
        //private void Form1_Load(object sender, EventArgs e)
        //{
        //    AcadApplication a= new AcadApplication();
        //    a.Visible = true;
           
        //}
      
        
                private void button1_Click(object sender, EventArgs e)
                {
                    Console.WriteLine("{0}", a);
                    double[] startPoint = new double[3]; //声明直线起点坐标
                    double[] endPoint = new double[3];//声明直线终点坐标
                    string[] str = textBox1.Text.Split(',');//取出直线起点坐标输入文本框的值，文本框的输入模式为＂x,y,z＂
                    for (int i = 0; i < 3; i  )
                        startPoint[i] = Convert.ToDouble(str[i]);//将str数组转为double型 
                    str = textBox2.Text.Split(',');//取出直线终点坐标输入文本框的值
                    for (int i = 0; i < 3; i  )
                        endPoint[i] = Convert.ToDouble(str[i]);
                    
                      a.ActiveDocument.ModelSpace.AddLine(startPoint, endPoint);//在AutoCAD中画直线
                      a.Application.Update();//更新显示
       
                   
                }

              
            }

          

        }