; center.lsp
;本程序創(chuàng)建多個孔的中心線。

(defun C:CENTER (/ COUNT_1 COUNT_2 DIST OBJECTS_X OBJECTS_Y SCALE
      CENTER CENTER_2 ENTITY_1 ENTITY_2 RADIUS RADIUS_2
      LEFT LEFT_2 RIGHT RIGHT_2 NAME
   BOTTOM BOTTOM_2 TOP TOP_2)
   ;設(shè)置所有變量
   (setvar "CMDECHO" 0)
   (command "linetype" "S" "CENTER" "")
   (setq SCALE (getvar "DIMSCALE"))
   (setq DIST (* 0.1 SCALE))
   ; 拾取所有的圓
   (princ "\n選擇所有希望添加中心線的圓:")
   (princ "\n ")
   (setq OBJECTS_X (ssget '((0 . "CIRCLE"))))
   ;構(gòu)造兩個選擇集（水平和垂直）
   (setq OBJECTS_Y (ssget "P"))
   ; 繪制水平線的主循環(huán)
   (setq COUNT_1 0)
   (while (< COUNT_1 (sslength OBJECTS_X))
      (setq ENTITY_1 (entget (ssname OBJECTS_X COUNT_1)))
      (setq CENTER (cdr (assoc 10 ENTITY_1)))
      (setq RADIUS (cdr (assoc 40 ENTITY_1)))
      (setq RIGHT (polar center 0.0 (+ RADIUS DIST)))
      (setq LEFT (polar RIGHT 3.141592654 (* 2.0 (+ RADIUS DIST))))
      (setq COUNT_2 (+ COUNT_1 1))
      (while (< COUNT_2 (sslength OBJECTS_X))
         (setq ENTITY_2 (entget (ssname OBJECTS_X COUNT_2)))
         (setq CENTER_2 (cdr (assoc 10 ENTITY_2)))
         (if (< (ABS (-  (cadr CENTER) (cadr CENTER_2))) 0.0001)
            (progn
               (setq RADIUS_2 (cdr (assoc 40 ENTITY_2)))
               (setq RIGHT_2 (polar CENTER_2 0.0 (+ RADIUS_2 DIST)))
               (setq LEFT_2 (polar RIGHT_2 3.141592654 (* 2.0 (+ RADIUS_2 DIST))))
               (if (< (car LEFT_2) (car LEFT))
                  (setq LEFT LEFT_2)
               )
               (if (> (car RIGHT_2) (car RIGHT))
                  (setq RIGHT RIGHT_2)
               )
               (setq NAME (ssname OBJECTS_X COUNT_2))
               (setq OBJECTS_X (ssdel NAME OBJECTS_X))
               (setq COUNT_2 (- COUNT_2 1))
            )
         )
         (setq COUNT_2 (+ COUNT_2 1))
      )      (command "line" LEFT RIGHT "")
      (setq COUNT_1 (+ COUNT_1 1))
   )      
   ; 繪制垂直線的主循環(huán)
   (setq COUNT_1 0)
   (while (< COUNT_1 (sslength OBJECTS_Y))
      (setq ENTITY_1 (entget (ssname OBJECTS_Y COUNT_1)))
      (setq CENTER (cdr (assoc 10 ENTITY_1)))
      (setq RADIUS (cdr (assoc 40 ENTITY_1)))
      (setq TOP (polar CENTER 1.570796327 (+ RADIUS DIST)))
      (setq BOTTOM (polar TOP 4.712388981 (* 2.0 (+ RADIUS DIST))))
      (setq COUNT_2 (+ COUNT_1 1))
      (while (< COUNT_2 (sslength OBJECTS_Y))
         (setq ENTITY_2 (entget (ssname OBJECTS_Y COUNT_2)))
         (setq CENTER_2 (cdr (assoc 10 ENTITY_2)))
         (if (< (ABS (-  (car CENTER) (car CENTER_2))) 0.0001)
            (progn
               (setq RADIUS_2 (cdr (assoc 40 ENTITY_2)))
               (setq TOP_2 (polar CENTER_2 1.570796327 (+ RADIUS_2 DIST)))
               (setq BOTTOM_2 (polar TOP_2 4.712388981 (* 2.0 (+ RADIUS_2 DIST))))
               (if (> (cadr TOP_2) (cadr TOP))
                  (setq TOP TOP_2)
               )
               (if (< (cadr BOTTOM_2) (cadr BOTTOM))
                  (setq BOTTOM BOTTOM_2)
               )
               (setq NAME (ssname OBJECTS_Y COUNT_2))
               (setq OBJECTS_Y (ssdel NAME OBJECTS_Y))
               (setq COUNT_2 (- COUNT_2 1))
            )
         )
         (setq COUNT_2 (+ COUNT_2 1))
      )
      (command "line" TOP BOTTOM "")
      (setq COUNT_1 (+ COUNT_1 1))
   )
   ; 復(fù)位所有變量并清除繪圖
   (command "linetype" "S" "BYLAYER" "")
   (command "redraw")
   (setvar "cmdecho" 1)
); end center.lsp