// [A,B,C] -> [ [a,b,c] , B , C ] -> ...

​

function setup() {

  createCanvas(400, 400);

  angleMode(DEGREES);

  hydra = addHead(200,200,1);

}

​

function addHead(xx,yy,level,initialAngle=0){

  let a,k,h;

  h = [];

  k = 80-level*20;

  a = 30+initialAngle;

  h.push({x:int(xx+k*cos(a)),y:int(yy+k*sin(a))});

  a+=120;

  h.push({x:int(xx+k*cos(a)),y:int(yy+k*sin(a))});

  a+=120;

  h.push({x:int(xx+k*cos(a)),y:int(yy+k*sin(a))});

  return h;

}

​

function draw() {

  background("darkred");

  fill("white");

  text('Prog-ctober 3rd - Cut one head... 3 will spawn!',50,14);

  text('Things get scaly!!',50,26);

  fill("rgb(30,108,23)");

  drawHydra(hydra);

}

​

function drawHydra(h,level=0){

  if (level>=6) return;

  for (let i=0;i<3;i++){

    if (h[i].x!=null){

      fill( lerpColor(color(30,108,23), color(13,65,9), (level)/6) );

      circle(h[i].x,h[i].y,120-level*20);

    }  

  }

  for (let i=0;i<3;i++){

    if (h[i].x==null){

      drawHydra(h[i],level+1);

    }

  }

}

​

let isDone;

function mousePressed(){

  isDone = [false];

  findAndChopClosestHead(hydra,mouseX,mouseY);

}

​

function findAndChopClosestHead(h,mx,my,level=0){

  if (isDone[0]) return;

  if (level>=6) return;

  for (let i=0;i<3;i++){

    if (h[i].x==null){

      findAndChopClosestHead(h[i],mx,my,level+1);

    }

  }

​

  for (let i=0;i<3;i++){

    if (h[i].x!=null){

      let d = dist(h[i].x,h[i].y,mx,my);

      if (d<(120-level*20)/2){

        h[i] = addHead( h[i].x,h[i].y,level+1,(1+level)*40);

        isDone = [true];

        return;

      }

    } 

  }

}

​