Write a function or a full program that applies an ASCII texture to a 2d shape.

Inputs: shape, texture, dimensions(optionally).

  • Both Shape and Texture can be given by any convenient method (2d matrix, array of strings or string with newlines)
  • Shape data have a rectangular shape and contains 2 possible values: [truthy/falsey] binary/integer values (0/1 or n1/n2) or 2 different characters, just specify which one represent the shape parts [truthy] and which one represent the blank parts [falsey] and be consistent .

  • The texture has a square shape only (width ≡ height) and contains printable ASCII characters.

  • Optionally you can also pass dimensions of the matrices if needed.

Output: the shape with each truthy value substituted with the corresponding texture value (coordinates/indices mod texture size), the blank parts must be substituted with spaces.

  • The ratio is always 1:1
  • The entire shape must be covered and only the shape.
  • No offset, texturing must start at top-left corner (0,0) of the shape data with the origin of the texture also at the top-left corner.

Examples (using various shape formats in JSON)






["  /\  ",
 " /\/\ ",
 " \/\/ ",
 "  \/  "]


["        xxxxxxxx     ",
 "  xxxxxxxxxxxxxxxx   ",
 "    xxxxxxxxxxxxxxxx ",
 "  xxxxxxxxxxxxxxxxxxx",




["        [__][__]     ",
 "  [__][__][__][__]   ",
 "    [__][__][__][__] ",
 "  [__][__][__][__][__",






["   b"]




["   ./]| |  / /.",
 "_|_|[]/ | \\/_|.",
 " /_  /|_|//\\/3/",
 "_|_|/ |_|_\\/_|.",
 " |_|  |/|_/\\_|/",
 "_/  /]|_/ /\\///",
 "_|_/[]|/|/ \\_|/",
 "_|/|[/|_|_ /_||",
 " /_./]|_|  \\/|/"]


(a surprise for you!)


  • Input/output can be given by any convenient method.
  • You can print it to STDOUT or return it as a function result.
  • Either a full program or a function are acceptable.
  • Extraneous whitespace are forbidden.
  • Standard loopholes are forbidden.
  • This is so all usual golfing rules apply, and the shortest code (in bytes) wins.

Sandbox post


14 Answers 14


APL (Dyalog Unicode), 20 12 bytesSBCS

-6 bytes through dzaima

Full program. Prompts stdin for:

  1. texture as a list of strings

  2. number of rows in shape matrix

  3. number of columns in shape matrix

  4. indices of falsies (to be blanks) in the shape matrix

All the s are supposed to be rectangles (they're not tofu). They symbolise a computer console which here means prompt for array input via stdin.

' '@⎕↑⎕⍴¨⎕⍴⎕

Try it online!

 prompt for texture as a list of strings; ["/\\","\\/"]

⎕⍴ prompt for number of rows in shape matrix (4) and use that to cyclically reshape the texture (this gives us enough texture lines); ["/\\","\\/","/\\","\\/"]

⎕⍴¨ prompt for number of columns in shape matrix (6) and use that to cyclically reshape each of the texture lines (this gives us enough characters in each texture line); ["/\\/\\/\\","\\//\\/\\","/\\/\\/\\","\\//\\/\\"]

 combine the list of lines into a character matrix;

' '@⎕ prompt for indices for blanks ([[0,0],[0,1],[0,4],[0,5],[1,0],[1,5],[2,0],[2,5],[3,0],[3,1],[3,4],[3,5]]) and then place blanks at those indices;


Canvas, 9 bytes

m⤢m⤢;n← ╋

Try it here!

Abusing that the input will be ASCII and so won't contain , but the shape is made of spaces and for easy overlapping and replacement. Alternative 12 bytes taking shape as space and #.


Japt, 10 bytes


Try it

ËmÈ?VgEY:S       U = shape as 2d array, V = texture as list of lines
Ë                Map each row, define E as row number
 mÈ                Map each element in these rows, define Y as element number
   ?                 Is the value a 1?
    VgEY               Get the character at texture[E,Y]
        :S           Else return a space if the value is a 0
  • \$\begingroup\$ You don't need the space before the : \$\endgroup\$
    – Shaggy
    Nov 16, 2019 at 13:28
  • \$\begingroup\$ @Shaggy Somehow I missed that. Thanks! \$\endgroup\$
    – Gymhgy
    Nov 16, 2019 at 19:01

J, 32 bytes

4 :'y}'' '',:x({.@]$($"1~{:))$y'

Try it online!

Some notes:

  • This was a rare case where I got a shorter solution with an explicit, rather than tacit, verb.
  • I wanted a solution that didn't prompt for input (ie, didn't want to just translate Adam's excellent APL solution into J).

Haskell, 51 49 bytes

  • The texture and shape are provided in the format used by the first example.
  • This works even if the texture isn't square or contains unprintables.
  • Dimensions do not need to be passed.
  • -2 bytes by abbreviating zipWith to z.
f=z(z(%)).cycle.map cycle
_%0=' '

Try it online!


05AB1E, 11 bytes


Port of @EmbodimentOfIgnorance's Japt answer, so make sure to upvote him!

Inputs as defined in the first format of the challenge. Output as a character-matrix.

Try it online or verify all test cases. (Footer will pretty-print the character-matrix, feel free to remove it to see the actual output.)


ε          # Map over the rows of the (implicit) integer-matrix:
 NU        #  Push the map-index, and then pop and store it in variable `X`
   ε       #  Inner map over the cells of the current row:
    i      #   If the value of the current cell is a 1:
     Xè    #    Use variable `X` to index into the (implicit) input-list of strings,
           #    with automatic wraparound
       Nè  #    And then use the inner map index to index into this string
    ë      #   Else:
     ð     #    Push a space instead

J, 19 bytes

]]&' '"+]g"1~g=:$~#

Try it online!

Dyadic train. Left argument is texture, right argument is shape, 1 is blank, 0 is fill.

How it works

I extended the dyadic & trick to the "If" usage of ^:, i.e. boolean repetition amount. Also, an assignment =: can group the part of the train on its right, saving a pair of parens.

]]&' '"+]g"1~g=:$~#  Left argument: texture, Right argument: shape
                $~#  Repeat the texture's rows to fit the shape's rows
             g=:     Assign this sub-function to g
        ]g"1~        Use g to do the same on columns
]     "+             For each cell on the texture and shape,
 ]&' '                 Replace the texture's cell with ' ' if shape's cell is 1
                       Keep the texture if shape's cell is 0

Julia 1.0, 68 bytes

f(s,t,n,Y,X)=[t[y,x] ? s[mod1(y,n),mod1(x,n)] : ' ' for y=1:Y,x=1:X]

Takes the shape as a 2d array of characters, the pattern as a array of Bools, and the dimensions (because length is long). Returns a character array via array comprehension.

Try it online!


Charcoal, 16 bytes


Try it online! Link is to verbose version of code. Takes input as newline-delimited strings. Explanation:


Loop over the shape.


If the value is a 1...


... then draw a 1x1 polygon filled using the template. Conveniently in Charcoal the fill is always relative to the origin of the canvas. Unfortunately Charcoal can't draw zero-sized polygons or Oblongs of sides less than 2, otherwise I could save a couple of bytes here.


If this is a newline...


... then move to the start of the next line of the canvas...

... otherwise move forward on the current line.


Jelly, 13 bytes


Try it online!

A dyadic link taking a list of Jelly strings for the texture as its left argument and an integer matrix for the shape as its right argument. Returns a list of Jelly strings.


Icon, 100 97 bytes

procedure f(t,s)
i:=0&r:=|!t\*s&i+:=1&j:=0&c:=|!r\*!s&s[i,j+:=1]:=[" ",c][s[i,j]]&\z
return s

Try it online!

Uses 1 for spaces and 2 for textured in shape data.


procedure f(t,s)                   ; t - texture, s - shape data
    i:=0 &                         ; i is the row index
    r:=|!t\*s &                    ; repeats the rows of the texture as many times as the rows of the shape data  
    i+:=1 &                        ; next row
    j:=0 &                         ; j is the column index; reset to start
    c:=|!r\*!s &                   ; repeats the characters of each row of the texture as many times as the row of the shape 
    s[i,j+:=1]:=[" ",c][s[i,j]] &  ; modify the shape data ot " " or to texture
    \z                             ; z is not declared and thus causes Icon to backtrack 
    return s                       ; return the modified shape data

Python 2, 97 94 86 bytes

lambda S,P,w:[''.join([' ',P[j%w][i%w]][v]for i,v in E(s))for j,s in E(S)]

Try it online!

3 bytes thx to frank

Takes the shape as S, a list list of 0/1;the texture P as a list of strings; and w as the width/height of P. Returns a list of strings.

  • 1
    \$\begingroup\$ Texture is guaranteed to be square so you can just do i%len(P) \$\endgroup\$
    – frank
    Nov 14, 2019 at 21:48
  • \$\begingroup\$ @frank - ah thanks, I missed that! \$\endgroup\$
    – Chas Brown
    Nov 14, 2019 at 21:52

Ruby, 65 bytes

->s,p,w,h{s.zip(p*h).map{|a,b|a.zip(b*w).map{|x,y|x>0?y:' '}*''}}

Try it online!

Input: Matrix of 0 and 1, texture as 2d array of characters, size of the matrix (width and height).


Japt, 9 bytes


Try it


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.