negate_id.dots

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Purpose

Since there is no way to set a dot’s id to a negative number directly, this librairy is a shortcut to changes the id of a dot to its opposite.

Usage

 T
L+R
 B

Parameters

• L, R, T or B: The entry for the dot can be any of the 4 directions.
• R, L, B or T: And the dot will go out to the opposite direction, continuing its way.

Example

%!negate_id.dots n

.---@7--n--$@--\
               |
               n
     /--$@-&   |
     n         $
     |         @
     \-@$--n---/

Output

-7
7
-7
7

Source

The source code is availaible here . If something doesn’t work, do not hesitate to open an issue.