let y1;

let x1Direction;

let y1Direction;

let x2;

let y2;

let x2Direction;

let y2Direction;

let x3;

let y3;

let x3Direction;

​

let y3Direction;

let x4;

let y4;

let x4Direction;

let y4Direction;

​

​

let _x2;

let _y2;

let _x2Direction;

let _y2Direction;

let _x3;

let _y3;

let _x3Direction;

​

​

function setup() {

  createCanvas(400, 400);

  frameRate(60);

​

  x1 = floor(random(width));

  y1 = floor(random(height));

  x1Direction = 1*4;

  y1Direction = -1;

  x2 = floor(random(width));;

  y2 = floor(random(height));;

  x2Direction = 1;

  y2Direction = 1;

  x3 = floor(random(width));

  y3 = floor(random(height));

  x3Direction = 1*3;

  y3Direction = 1;

  x4 = floor(random(width));

  y4 = floor(random(height));

  x4Direction = -1;

  y4Direction = 1*2;

  _x2Direction = 1;

  _y2Direction = -1;

  _x2 = floor(random(width));

  _y2 = floor(random(height));

  _x3 = floor(random(width));

  _y3 = floor(random(height));

  _x3Direction = 1;

  _y3Direction = 1;

}

​

function draw() {

  background("#222222");

​

  noFill();

  stroke("#00fbe1");

  strokeWeight(2);

  // line(85, 20, 10, 10);

  // line(90, 90, 15, 80);

​

  x1 += x1Direction;

  if (x1 > width || x1 < 0) {

    x1Direction = -x1Direction;

  }

  y1 += y1Direction;

  if (y1 > height || y1 < 0) {

    y1Direction = -y1Direction;

  }

  x2 += x2Direction;

  if (x2 > width || x2 < 0) {

    x2Direction = -x2Direction;

  }

  y2 += y2Direction;

  if (y2 > height || y2 < 0) {

    y2Direction = -y2Direction;

  }

​

  x3 += x3Direction;

  if (x3 > width || x3 < 0) {

    x3Direction = -x3Direction;

  }

  y3 += y3Direction;

  if (y3 > height || y3 < 0) {

    y3Direction = -y3Direction;

  }

  x4 += x4Direction;

  if (x4 > width || x4 < 0) {

    x4Direction = -x4Direction;

  }

  y4 += y4Direction;

  if (y4 > height || y4 < 0) {

    y4Direction = -y4Direction;

  }

  _x2 += _x2Direction;

  if (_x2 > width || _x2 < 0) {

    _x2Direction = -_x2Direction;

  }

  _y2 += _y2Direction;

  if (_y2 > height || _y2 < 0) {

    _y2Direction = -_y2Direction;

  }

  _x3 += _x3Direction;

  if (_x3 > width || _x3 < 0) {

    _x3Direction = -_x3Direction;

  }

  _y3 += -y3Direction;

  if (_y3 > height || _y3 < 0) {

    _y3Direction = -_y3Direction;

  }

​

  bezier(x1, y1, x2, y2, x3, y3, x4, y4);

  bezier(x4, y4, _x2, _y2, _x3, _y3, x1, y1);

}

​