CAD画齿轮的渐开线程序

CAD 中齿轮画法 有下面一段渐开线程序： ;;;begain suprgear.lsp ;************************************************* ;SPURGEAR.LSP - a lisp program by Tony Hotchkiss ;------------------------------------------------- ; This routine draws a spur gear using joined ; polylines. It lets you use any pressure angle ; to design the gear teeth. ;************************************************* (defun err (s) (if (= s "Function cancelled") (princ "\nSPURGEAR - cancelled: ") (progn (princ "\nSPURGEAR - Error: ") (princ s) (terpri)) ); if (resetting) (princ "SYSTEM VARIABLES have been reset\n") (princ) ); err (defun setv (systvar newval) (setq x (read (strcat systvar "1"))) (set x (getvar systvar)) (setvar systvar newval) ); setv (defun setting () (setq oerr *error*) (setq *error* err) (setv "CMDECHO" 0) (setv "BLIPMODE" 0) ); end of setting (defun rsetv (systvar) (setq x (read (strcat systvar "1"))) (setvar systvar (eval x)) ); restv (defun resetting () (rsetv "CMDECHO") (rsetv "BLIPMODE") (setq *error* oerr) ); end of resetting (defun dxf (code ename) (cdr (assoc code (entget ename))) ); dxf (defun spurgear (/ D N phi DO RO A B DR DB inv-plst p1 trimcode invent p0 p curvent linent linent2 ent2 p2) (setq D (getreal "\nPitch diameter: ") N (getint "\nNumber of teeth: ") phi (getreal "\nPressure angle: ") phi (* (/ phi 180) pi) ; Pressure angle DO (* D (+ (/ 2.0 N) 1.0)); Outside diameter RO (/ DO 2.0) ; Outside radius A (/ D N) ; Addendum B (* 1.25 A) ; Dedendum DR (- D (* B 2.0)) ; Root diameter DB (* D (cos phi)) ; Base circle dia. inv-plst (involute DB N phi);involute points trimcode nil ); setq (command "ZOOM" (list 0 (- B)) (list RO (/ RO 1.5)) ); command (setq invent (draw-inv inv-plst)); Draw involut...