如何利用CAD制图钩子功能进行布局？

CAD（计算机辅助设计）软件的钩子功能（LISP、VBA、ObjectARX等）是一种强大的工具，可以帮助用户自定义命令、工具和宏，从而提高制图效率和自动化程度。本文将详细介绍如何利用CAD制图钩子功能进行布局。

一、了解CAD钩子功能

钩子函数（Hook Functions）
钩子函数是CAD中的一种特殊函数，用于在CAD的某些关键操作时刻触发，例如打开文件、保存文件、关闭文件等。通过编写钩子函数，用户可以在这些时刻执行特定的操作。
钩子函数类型
根据触发时机，钩子函数主要分为以下几种类型：
（1）文件钩子：在打开、保存、关闭文件时触发；
（2）命令钩子：在执行特定命令时触发；
（3）事件钩子：在CAD系统发生特定事件时触发。

二、利用钩子功能进行布局

创建布局视图

（1）编写钩子函数：在打开文件时，通过编写钩子函数，在布局空间中创建一个新的视图。

(defun c:layout()

  (command "layout" "insert" "model" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0" "0,0,0"