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edited Apr 13, 2017 at 12:39

Sometimes the required ASCII art is symmetric at some point. For example, Argyle ASCII Art Argyle ASCII Art requires an output similar to this:

In ASCII Art Archery Arrows ASCII Art Archery Arrows the result to print is this, scaled to a given n:

Sometimes the required ASCII art is symmetric at some point. For example, Argyle ASCII Art requires an output similar to this:

In ASCII Art Archery Arrows the result to print is this, scaled to a given n:

Sometimes the required ASCII art is symmetric at some point. For example, Argyle ASCII Art requires an output similar to this:

In ASCII Art Archery Arrows the result to print is this, scaled to a given n:

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created Sep 3, 2015 at 23:39

PurkkaKoodari

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Look for symmetry

Sometimes the required ASCII art is symmetric at some point. For example, Argyle ASCII Art requires an output similar to this:

    /\        /\
   /  \  /\  /  \
/\/    \/  \/    \/\
\/\    /\  /\    /\/
   \  /  \/  \  /
    \/        \/

One could just print this normally, but depending on the language, the code required can be shortened by only generating the top half of the result, reversing it and swapping / and \.

Try transposing

In ASCII Art Archery Arrows the result to print is this, scaled to a given n:

     /\
    /  \
   /    \
  /      \
  \      /
   \____/
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
    |  |
   /|  |\
  / |  | \
 /  |  |  \
/   |  |   \
/   |  |   \
/   |__|   \
/  /    \  \
/ /      \ \
//        \\
/          \

If we take a look at the arrow, we can see there's 8 kinds of lines:

/ \
\ /
\_/
| |
/ | | \
/ |_| \
/ / \ \
/ \

Let's try the same for its transpose.

                         ///////
                        /     / 
   /\                  /     /  
  /  \                /     /   
 /   _||||||||||||||||||||||    
/    _                     _    
\    _                     _    
 \   _||||||||||||||||||||||    
  \  /                \     \   
   \/                  \     \  
                        \     \ 
                         \\\\\\\

Here, there are 10 kinds of lines.

/
/ /
/ \ / /
/ _|
/ _ _
\ _ _
\ _|
\ / \ \
\ \
\

But here's the catch: the bottom 5 are identical to the top 5, except for swapping / and \. As per the previous rule, you can first generate the first 5, copy, do the swap, and finally transpose to get the arrow. This can save a lot of code.