Multiple Math Functions in a Lisp String

I'm trying to write a routine to draw a style of cover that we use regularly, but I'm having trouble getting past the math functions in lisp. I should clarify that I don't have a clue on .lsp programing; so any help must take that into consideration to save both of us a lot of headaches.

Here is what I have so far:

(defun c:SBC ()

(defun dtr (deg)

(* deg (/ pi 180))

)

(setvar "cmdecho" 0)

; Data Input

(prompt "\nENTER ALL DIMENSIONS IN DECIMALS ")

(setq mthk (getreal "\nEnter Material Thickness: "))

(setq ikr (getreal "\nEnter Cover I/S Knuckle Radius: "))

(setq csf (getreal "\nEnter Cover Straight Flange: "))

(setq covrad (getreal "\nEnter Cover I/S Radius: "))

(setq covlng (getreal "\Enter Cover I/S Length: "))

(prompt "\nEnter Lip I/S Dimension: : "))

(if (= lip nil) (setq lip 0.4375))

(prompt "\nEnter Hinge I/S Width: : "))

(if (= hw nil) (setq hw 1.0))

(setq hdp (getreal "\nEnter Hinge I/S Depth: "))

; Calculations

;Inside Bend Radius

(setq isbr (/ mthk 2))

;Included Bend Angle at Lip

(setq iba1 (dtr 90))

;Centerline Bend Radius

(setq cbr1 (= mthk))

;Centerline Arc Length at Lip

(setq cal1 ((* cbr1 2 pi iba1) / 360)))

;Centerline Arc Length/2 at Lip

(setq hafcal1 (cal1 / 2))

;Centerline Bend Radius at Flange

(setq cbr2 ((mthk / 2) + ikr)

;Included Bend Angle at Flange

(setq iba2 (angle 90))

;Centerline Arc Length at Flange

(setq cal2 (cbr2 * 2 * pi * iba2 / 360))

;Circle Blank Radius

(setq cirbr (covrad - ikr + cal2 + csf))

)

Assuming your math is correct and your intent, then below should work alright:

;Inside Bend Radius
(setq isbr (/ mthk 2)) 
;Included Bend Angle at Lip
(setq iba1 (dtr 90))
;Centerline Bend Radius
(setq cbr1 mthk)
;Centerline Arc Length at Lip
(setq cal1 (/ (* cbr1 2 pi iba1) 360)))
;Centerline Arc Length/2 at Lip
(setq hafcal1 (/ cal1 2))
;Centerline Bend Radius at Flange
(setq cbr2 (+(/ mthk 2) ikr)
;Included Bend Angle at Flange
(setq iba2 (angle 90))
;Centerline Arc Length at Flange
(setq cal2 (/ (* cbr1 2 pi iba2) 360))
;Circle Blank Radius
(setq cirbr (- covrad (+ ikr cal2 csf)))

Great!

I didn't know how to sequence the string.

Bill T.

No Problem! We all start somewhere,

I've gotten past my last hurdle, now after running the routine I am able to input the data, and the all of the drawings from the routine seem to function but I get the following:

Pick Formed End View Location: Unknown command "SBC". Press F1 for help.

*Invalid*

*Invalid*

*Invalid*

*Invalid*

*Invalid*

*Invalid*

*Invalid*

Unknown command "SBC". Press F1 for help.

*Invalid*

Unknown command "SBC". Press F1 for help.

The routine is attached.

Thanks!

SBC.lsp

some changes

(setq lip (getreal "\nEnter Lip I/S Dimension: <0.4375>")) 
(setq isbr (/ mthk 2.0)) ; if mthk is a Int value like 3 you may not get 1.5 better to divide with a real
; just me 
(setq dtr90 (/ pi 2.0)) (setq dtr180 pi) (setq dtr270 (* 1.5 pi)); put this at start use variable in code dtr 0 is 0.0
(setq ev2 (polar ev1 dtr90 lbcp))
(command "CLAYER" "03-OBJECT LINE 3" "")  ; me  (setvar "clayer" "CLAYER" "03-OBJECT LINE 3")

If your going to do this type of thing all the time you could make a DCL that is a universal multiline input you can pass the request detail so it can ask many questions have a look at this

;; Input  Dialog box with variable title
;; By Ah June 2012
;; code (ah:getval title)
(defun AH:getval (title width limit / fo)
(setq fname "C://acadtemp//getval.dcl")
(setq fo (open fname "w"))
(write-line "ddgetval : dialog {" fo)
(write-line " : row {" fo)
(write-line ": edit_box {" fo)
(write-line (strcat "    key = "  (chr 34) "sizze" (chr 34) ";") fo)
(write-line  (strcat " label = "  (chr 34) title (chr 34) ";"  )   fo)
; these can be replaced with shorter value etc
;(write-line "     edit_width = 18;" fo) 
;(write-line "     edit_limit = 15;" fo)
(write-line width fo) 
(write-line limit fo)
(write-line "   is_enabled = true;" fo)        
(write-line "    }" fo)
(write-line "  }" fo)
(write-line "ok_cancel;}" fo)
(close fo)
(setq dcl_id (load_dialog  "c:\\acadtemp\\getval"))
(if (not (new_dialog "ddgetval" dcl_id))
(exit))
(action_tile "sizze" "(setq item  $value)(done_dialog)")
(mode_tile "sizze" 3)
(start_dialog)
; returns the value of item
)

Thanks,

I'll try those suggestions.

Any idea as to the reason for the error after the script runs, just for my information, as I don't know the cause?

OK, I found the problem. By changing CMDECHO to 1 and following the process I found that I was missing a step in the PLINE ARC, specifically the DIRECTION step. In the PLINE sequence I added "D" after each "A" and solved the issue.

Thanks,

Bill T.