Code for daily

180525.scala

//roughly like this

function draw(){
  var frac =  (gCount%200)*1.0/(100)
  if(frac>1 ) frac = 2-frac
  var frac2 =  (gCount%200)*1.0/(200)
  gFrac = 1-frac2
  val s = 40

  for(k <- 0 until s){
    val sx = if (k%2==0) -width/2 else (k)*1.0/s*width-width/2
    val sy = if (k%2==0) -height/2+k*1.0/s*height else -height/2
    val ex = if (k%2==0) (k)*1.0/s*width-width/2 else -width/2
    val ey = if (k%2==0) -height/2 else -height/2+k*1.0/s*height
    val start = new Vec2(sx,sy)
    val end = new Vec2(ex,ey)
    val d = start.distance(end)
    val s2 = (d/5).toInt
    for(l <- 0 to s2){
      val f = l*1.0/s2
      val px = start.x+f*(end.x-start.x)
      val py = start.y+f*(end.y-start.y)
      val pp = new Vec2(px,py).rotate(frac2*TWO_PI)
      var dy = (field(pp.x,pp.y)-.5)*20
      val d = new Vec2(px,py).length/width
      dy *= frac* 4*(cos((d-frac)*12*TWO_PI)*(1-frac)*frac+frac)
      if(l%2==1) dy*= -1
      trace += new Vec2(px+dy,py+dy)
    }
  }
  for(k <- 0 until s){
    val sx = if (k%2==0) (k)*1.0/s*width-width/2 else width/2
    val sy = if (k%2==0) height/2 else -height/2+k*1.0/s*height 
    val ex = if (k%2==0) width/2 else (k)*1.0/s*width-width/2
    val ey = if (k%2==0) -height/2+k*1.0/s*height else height/2
    val start = new Vec2(sx,sy)
    val end = new Vec2(ex,ey)
    val d = start.distance(end)
    val s2 = (d/5).toInt
    for(l <- 0 to s2){
      val f = l*1.0/s2
      val px = start.x+f*(end.x-start.x)
      val py = start.y+f*(end.y-start.y)
      val pp = new Vec2(px,py).rotate(frac2*TWO_PI)
      var dy = (field(pp.x,pp.y)-.5)*20
      val d = new Vec2(px,py).length/width
      dy *= frac* 4*(cos((d-frac)*12*TWO_PI)*(1-frac)*frac+frac)
      if(l%2==1) dy*= -1
      trace += new Vec2(px+dy,py+dy)
    }
  }
  gCount+=1
  beginShape
  trace.map(v => vertex(v.x,v.y))
  endShape
}
def field(x:Double, y:Double) = {
  val sc = 0.04*gFrac
  min(1, max(0,(noise(x*sc, y*sc)-.15)/.7))
}