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.

' '@⎕↑⎕⍴¨⎕⍴⎕

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 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← ╋

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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
    Commented Nov 16, 2019 at 13:28
  • \$\begingroup\$ @Shaggy Somehow I missed that. Thanks! \$\endgroup\$
    – Gymhgy
    Commented Nov 16, 2019 at 19:01

J, 32 bytes

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

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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=' '

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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=:$~#

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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.

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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


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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

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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)]

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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
    Commented Nov 14, 2019 at 21:48
  • \$\begingroup\$ @frank - ah thanks, I missed that! \$\endgroup\$
    – Chas Brown
    Commented 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:' '}*''}}

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


Japt, 9 bytes


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