统计长度和统计面积
;****************************************************测量长度(defun c:555()
(setq os (getvar "osmode"))
(setvar "osmode" 0)
(setq sum 0 i 0)
(setq ss (ssget))
(repeat (sslength ss)
(setq en (ssname ss i))
(command "lengthen" en "")
(setq l (getvar "perimeter"))
(setq sum (+ sum l)
i (+ i 1))
)
(setvar "osmode" os)
(princ "\n长度之和 = ")
(princsum )
)
;****************************************************测量长度
(defun c:LWW614()
(setq os (getvar "osmode"))
(setvar "osmode" 0)
(setq sum 0 i 0)
(setq ss (ssget))
(repeat (sslength ss)
(setq en (ssname ss i))
(command "lengthen" en "")
(setq l (getvar "perimeter"))
(setq sum (+ sum l)
i (+ i 1))
)
(setvar "osmode" os)
(princ "\n长度之和 = ")
(princsum )
)
;****************************************************面积求和
(defun c:666 (/ olderr oldcmdecho errexit undox restore ss1 nr en tot_area)
(defun errexit (s)
(restore)
)
(defun undox ()
(command "._undo" "_E")
(setvar "cmdecho" oldcmdecho)
(setq *error* olderr)
(princ)
)
(setq olderr *error*
restore undox
*error* errexit
)
(setq oldcmdecho (getvar "cmdecho"))
(setvar "cmdecho" 0)
(command "._UNDO" "_BE")
(if (setq ss1 (ssget '((-4 . "<OR")
(0 . "POLYLINE")
(0 . "LWPOLYLINE")
(0 . "CIRCLE")
(0 . "ELLIPSE")
(0 . "SPLINE")
(0 . "REGION")
(-4 . "OR>")
)
)
)
(progn
(setq nr 0)
(setq tot_area 0.0)
(setq en (ssname ss1 nr))
(while en
(command "._area" "_O" en)
(setq tot_area (+ tot_area (getvar "area")))
(setq nr (1+ nr))
(setq en (ssname ss1 nr))
)
(princ "\n面积之和 = ")
(princ tot_area)
)
)
(restore)
)
代码如上为何统计长度时，最终计算结果重复显示？如何修改？统计面积的结果为科学计数法？怎么修改？
Ref: Rtos 函数 (princ tot_area) → (princ (rtos tot_area 2 3)) 代码中间出现的握嘴笑和哭脸是几个意思啊 选长度会报错~
命令: 555
选择对象: 找到 1 个
选择对象: 找到 1 个，总计 2 个
选择对象:
当前长度: 4061.6291
需要数值距离、两点或选项关键字。
Error: 函数已取消
指定总长度或 [角度(A)] <156.0092>: *取消*
命令: *取消*
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