Created
January 27, 2020 17:44
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// Adapted from andai.tv/bonsai/ | |
const pipe = (...fns) => (x) => fns.reduce((x, fn) => fn(x), x); | |
// const output = document.getElementById("output"); | |
const ROWS = 30; | |
const COLS = 40; | |
const LIFE = 28; | |
const MAX_BRANCHES = 1024; | |
let branches = 0; | |
const rand = (min, max) => int(min + Math.random() * (Math.abs(min)+max)); | |
const int = (float) => Math.round(float); | |
const makeCol = (len) => new Array(len).fill(' '); | |
function createGrid(rows = ROWS, cols = COLS) { | |
return new Array(rows) | |
.fill(cols) | |
.map(makeCol); | |
} | |
function grow(life = LIFE) { | |
return (grid) => { | |
const rows = grid.length; | |
if (!rows) throw new Error('Invalid grid dimensions'); | |
const cols = grid[0].length; | |
const x = int(cols / 2); //+ rand(-1*cols/3, 2*cols / 3) | |
const y = rows - 3; | |
return branch(grid, x, y, life); | |
}; | |
} | |
function getChar(dx, dy, life) { | |
switch (true) { | |
case (life === 0): return '&'; | |
case (dy === 0): return '~'; | |
case (dx === 0): return '|'; | |
case (dx > 0): return '/'; | |
case (dx < 0): return '\\'; | |
default: return ' '; | |
} | |
} | |
function branch(grid, x, y, life, maxBranches = MAX_BRANCHES) { | |
branches++; | |
while (life > 0) { | |
const dy = (rand(0, 10) > 3) | |
? -1 | |
: 0; | |
const dx = rand(-2, 2); | |
life--; | |
// recurse | |
if (branches < maxBranches) { | |
if (life % 13 == 0 || rand(0, 40) < 2 || life < 5) { | |
grid = branch(grid, x, y, life); | |
} | |
} | |
x += dx; | |
y += dy; | |
// console.log(x,y); | |
grid[y][x] = getChar(dx, dy, life); | |
} | |
return grid; | |
} | |
function print(grid) { | |
let str = grid.map((row) => row.join('')) | |
.join('\n'); | |
// output.value = str | |
console.log( | |
str | |
); | |
} | |
const bonsai = pipe( | |
createGrid, | |
grow(), | |
print, | |
); | |
bonsai(); |
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