fractal snowflakes

//For the #wccChallenge on the theme of 'Winter'

//Fractal recursive snowflakes

//OK, time to get back to prepping for another #genuary run, now that the prompts are released...

​

let startWidthScale, lengthScale, rotOffset, m

​

function setup() {

  m= min(windowWidth, windowHeight)

  createCanvas(windowWidth, windowHeight);

  background(0);

  let gs=m*0.2

  let spacing=gs+(m*0.025)

  for(let x=0; x<width+spacing; x+=spacing*2){

    for(let y=0; y<height+spacing; y+=spacing){

      snowFlake(x, y, gs)

      snowFlake(x+spacing, y-(spacing*0.5), gs)

    }

  }

}

​

function snowFlake(x, y, size){

​

  let inc=TAU/6

  let initalLength=size*0.5

  startWidthScale= random(0.008, 0.04)

  lengthScale=random(0.35, 0.55)

  rotOffset=random(-PI*0.1, PI*0.08)

  for(let i=0; i<TAU; i+=inc){

    push()

  translate(x, y)

  rotate(i)

    let start= createVector(0, 0)

    flakeFractal(start, initalLength)

  pop()

  }

}

​

​

function flakeFractal(startPos, length){

  fill(255, 100)

  strokeWeight(length*0.01)

  stroke(255)

  let startWidth= length*startWidthScale

  triangle(startPos.x-startWidth, startPos.y, startPos.x+startWidth, startPos.y, startPos.x, startPos.y-length)

  if(length>10){

  let addInc= length/8

  let pos= createVector(0, 0)

  for(let i=addInc; i<length-addInc; i+=addInc){

    let newLength= map(abs(i-length/2), length/2, 0, 0, length*lengthScale)// length*0.4725

    push()

    translate(startPos.x, startPos.y-i)

    rotate(-QUARTER_PI+rotOffset)

    flakeFractal(pos, newLength)

    pop()

    push()

    translate(startPos.x, startPos.y-i)

    rotate(QUARTER_PI-rotOffset)

    flakeFractal(pos, newLength)

    pop()

  }

  } 

}