Snippet Zone

Cistercian Numerals (semi-golfed)

```
N = -1
```
```
S = 30
```
```
H = 90
```
```
h = 45
```
```
d = document
```
```
b = d.body
```
```
m = _ => d.createElement(_)
```
```
a = _ => b.appendChild(_)
```
```
 
```
```
with(a(
```
```
    Object.assign(
```
```
      m`canvas`,
```
```
      { width: 80, height: 120 }
```
```
    )
```
```
  ).getContext`2d`
```
```
) { 
```
```
  a(m`br`)
```
```
 
```
```
  L = (a, b, C, d) => {
```
```
    moveTo(a, b)
```
```
    lineTo(C, d)
```
```
  }
```
```
 
```
```
  M = _ => L(0, 0, 0, H)
```
```
  O = _ => L(0, 0, S, 0)
```
```
  W = _ => L(0, S, S, S)
```
```
  T = _ => L(0, 0, S, S)
```
```
  F = _ => L(0, S, S, 0)
```
```
  X = _ => L(S, 0, S, S)
```
```
 
```
```
  D = [
```
```
    _ => {},
```
```
    O, W, T, F, 
```
```
    [O,F],
```
```
    X,
```
```
    [O,X],
```
```
    [W,X],
```
```
    [O,W,X]
```
```
  ]
```
```
 
```
```
  n = s => {
```
```
    [...s].reverse().map((l, i) => {
```
```
      save()
```
```
      translate(S+9, h+9)
```
```
      scale(N**i, N**~~(i/2))
```
```
      translate(0, -h)
```

      M() ;[D[l]].flat().map(x => x && x())

```
      restore()
```
```
    })
```
```
  }
```
```
 
```
```
  a(m`input`).oninput = e => {
```
```
    clearRect(0, 0, 80, 120)
```
```
    beginPath()
```
```
    n(~~e.target.value+'')
```
```
    stroke()
```
```
  }
```
```
}
```

Type any number from 0-9999 into the input field and see the corresponding Cistercian Numeral. This snippet is partially golfed, I left the canvas commands intact to make things a bit easier to understand.

Simpler SVG Version

This one hardcodes all numbers 0-9 as paths, unlike the canvas version which only defines 1,2,3,4 and 6 as paths and then combines them to create 5,7,8 and 9.

```
h='innerHTML'
```
```
C='children'
```
```
 
```
```
document.body[h]=`
```

<svg id=G width=99 viewBox="0 0 80 120"

  style="stroke:black;fill:none;overflow:visible">

```
  <g transform="translate(30,2)">
```
```
    <path d="M0 0L 30 0"/>
```
```
    <path d="M0 30L 30 30"/>
```
```
    <path d="M0 0L 30 30"/>
```
```
    <path d="M0 30L30 0"/>
```
```
    <path d="M0 30L30 0 0 0"/>
```
```
    <path d="M30 0L30 30"/>
```
```
    <path d="M30 30L30 0 0 0"/>
```
```
    <path d="M0 30L30 30 30 0"/>
```
```
    <path d="M0 30L30 30 30 0 0 0"/>
```
```
  </g>
```

  <g transform=translate(30,2)scale(-1,1)></g>

  <g transform=translate(30,92)scale(1,-1)></g>

  <g transform=translate(30,92)scale(-1,-1)></g>

```
  <path id=m d="M 30 2 L 30 92"/>
```
```
</svg>
```

<style>path:not(#m){opacity:0}</style><br>

```
<input id=I>`
```
```
 
```
```
c=G[C]
```
```
p=c[0][h] 
```
```
 
```
```
n = s => 
```
```
  [...s].reverse().map((l, i) => 
```

   l-1>-1 && (c[i][C][l-1].style.opacity=1))

```
 
```
```
I.oninput = e => {
```
```
  for(i=0;i<4;i++)c[i][h]=p
```
```
  n(~~e.target.value+'')
```
```
}
```

September 24, 2021

// arrays // canvas // codegolf // graphics // hacks // javascript // math

Cistercian Numerals (semi-golfed)

Simpler SVG Version

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