绘平面控制网图和误差椭圆图程序

Program of Drawing Horizontal Control Nets and Error Ellipses

本程序采用ＢＡＳＩＣ语言编制，用于ＰＣ－Ｅ５００袖珍计算机和ＮＦ－ＰＰ４０精密四色绘图仪。该程序适用于绘制各种平面控制网图和各点上的误差椭圆图。本程序使用键盘输入语句和置数语句、读数语句，计算机根据输入的数据，逐一打印，以便查对，然后绘出平面控制网图。根据使用者的需要，是否绘出各未知点上的误差椭圆图。最后打印出绘图比例尺。

This Program is written in BASIC language,is made use of in PC-E500 Pocket computerand in NF-PP40 precies instrtiment of drawing in four colours.This program is applied todraw vavious horizontal control nets and error ellipses in each poionts; This program adopts in-put and data、read. Accroding to inputing data,the computer prints out one by one,for useas check,draus horizontal control nets then. According to need of consumer,whether or notthe computer drows error ellipses in each unknown points. The computer prints the scale ofdrawn figures finallgy.