# Distance from given reference

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Hello guys!

I am trying to get the distance from one point to another, then add it to the given reference as part of a text in the drawing. (The text format is "Ref. 364.80", for example).

I have searched over the other topics and this is what I found:

and

Also, my drawings are all scaled 1:100, so the distance must be divided by 10 before adding the reference cote.

Here is the screenshot:

Thank you!

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Can you attached example drawing

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This is what you want it is metric.

```;Calculates level of a point in cross or long sections
; BY alanh 2014

(setvar "cmdecho" 0)

(princ "\n To run just type SRL")

;;-------------------=={ Parse Numbers }==--------------------;;`
;;                                                            ;;
;;  Parses a list of numerical values from a supplied string. ;;
;;------------------------------------------------------------;;
;;------------------------------------------------------------;;
;;  Arguments:                                                ;;
;;  s - String to process                                     ;;
;;------------------------------------------------------------;;
;;  Returns:  List of numerical values found in string.       ;;
;;------------------------------------------------------------;;

(defun LM:ParseNumbers ( s )
(
(lambda ( l )
(strcat "("
(vl-list->string
(mapcar
(function
(lambda ( a b c )
(if
(or
(< 47 b 58)
(and (= 45 b) (< 47 c 58) (not (< 47 a 58)))
(and (= 46 b) (< 47 a 58) (< 47 c 58))
)
b 32
)
)
)
(cons nil l) l (append (cdr l) (list nil))
)
)
")"
)
)
)
(vl-string->list s)
)
)

(defun c:SRL ()
(setq olddimzin (getvar "dimzin"))
(setvar "dimzin" 0)
(if (= dwgscale nil)
(setq dwgscale (/ 1000.0 (getreal "\n enter vertical scale ")))
)
;(setq datum (getreal "\n Enter datum level "))
(setq datum (car (LM:ParseNumbers (cdr (assoc 1 (entget (car (entsel "\nPick datum text"))))))))

(setq test 1)
(setq pt1 (cadr (getpoint "\npick datum")))
(while (= test 1)

(setq pt2 (cadr (getpoint "\npick point")))

(setq dist (/(abs (- pt1 pt2)) dwgscale))

(setq en1 (car (entsel "\nSelect text number:" )))
(if (/= en1 nil)
(progn
(setq tent (entget en1))
(setq a (+ dist datum))
(setq a (rtos a 2 3))
(setq el (subst (cons 1 a) (assoc 1 tent) tent))
(entmod el)
);progn
);if
); while t

(setq el nil
en nil
a nil
en1 nil
test nil)

(setvar "cmdecho" 1)
(setvar "dimzin" olddimzin)
(princ)
)	;ends main defun
```

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Thank you!

And thank you for the scale selection. I have tested  and it works very fine. Have a look.

It worked perfectly with a 100 scale.

Big hugs.

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• 3 weeks later...

Suchlike, I would like to find a point from the reference up, with the distance I need. I attach the drawing.

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Look at the code and make a new function, you know the datum XY and RL 133.0 you know the scale so the distance is add to datum the difference * scale etc, if you enter a chainage can work out a X offset point from say 0.0 line. You have the Y value so draw circle etc.

Have a think about the select sequence,

datum point

datum rl text

0.0 line maybe use as datum point

Need Hor and Ver scales.

Have a go a good learning exercise the Surface rl.lsp has all the code you need. Make a copy of it and start there.

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