寻找散点边界

《AutoLISP 机械设计高级应用实例》 基于autolisp和CAD的机械绘图方面的专业书籍(AutoLISP Advanced Application Examples of Mechanical Design Professional Books on Mechanical Drawing Based on Autolisp and CAD)

快捷标注多段线点号坐标，快捷查看封闭区域面积，单位亩、平方米等，加载lsp至cad即可使用(Quick Note polyline dot coordinates, quick check enclosed area of ​ ​ the unit acres, square, etc., can be used to load lsp to cad)

建筑铝合金模板楼面布板，基于cad平台二次开发，使用lisp语言。(Building Aluminum Alloy floor layout template)

说明：  很实用的vlisp开发小助手，代码自动生成(Very practical VLISP development assistant, automatic code generation)

主要论述了基于FPGA的末制导雷达伺服系统设计。结合末制导雷达讨论其电机控制、二阶伺服系统性能和PID校正算法,利用VHDL语言设计,实现基于FPGA的方位步进电机开环定位控制和俯仰直流电机闭环速度控制的伺服系统。结合实际应用中遇到的问题,提出了基于"反馈控制"理论的有效的补偿算法,该算法提高了伺服系统的稳定性、快速性和精度。(Mainly discusses the design of terminal guidance radar servo system based on Field Programmable Gates Array(FPGA).It includes the system’s electric machine control,second-order servo system performance and PID correction algorithm based on Virtual Hardware Description Language(VHDL) on azimuth stepping motor open loop positioning control and pitch direct current electric machine closed loop speed control of the FPGA servo system.In allusion to some factual problems during its application,presents corresponding effective solutions based on traditional control theory "Feedback Control".The fact proves that these methods can greatly improve the stability,speediness and precision of the original servo system.Additionally,a basic algorithm which can be realized in a terminal guidance radar servo system is given)

批量修改dwg格式图中，文字高度，根据lisp语言进行编写(Batch Edit dwg format, figure, text height, according to the preparation of lisp language)

AUTOLISP CAD批量将圆变成以圆心为坐标的点(Circular change point)

此为AutoCAD二次开发程式源代码，可以自动标注所选图元X及Y方向的坐标尺寸(Set select drawing )

说明：  CAD删除重复的圆和重复线，只针对同一图层。(CAD deletes duplicate circles and heavy lines, only for the same layer)

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