let field, field2;

let T = 0;

​

function setup() {

  createCanvas(W, H);

​

  field = new Field(W, H, 10);

​

  MetaBalls = new ParticleSystem(W, H);

​

  MetaBalls.generate_worm(15, 25, 30, 0, 100);

​

}

​

function draw() {

  background(0);

  field.clear();

​

  //MetaBalls.update();

  Move_MetaBug(T, MetaBalls, 15, 90);

​

  field.update_values(MetaBalls, false);

  field.draw("smooth", false, [255, 255, 0, 255], [45, 255, 100, 255], 3);

​

  //MetaBalls.draw([255, 255, 0, 0], [255, 255, 0, 55], true);

}

​

function Move_MetaBug(T, A, _maxv, _range) {

  if (dist(A.all[0].x, A.all[0].y, A.all[0].heading.x, A.all[0].heading.y) < A.all[0].r / 2) {

    A.all[0].facing = radians(random(degrees(A.all[0].facing) - _range, degrees(A.all[0].facing) + _range));

    A.all[0].flength = random(A.all[0].r * 4, A.all[0].r * _maxv);

    A.all[0].heading.x = A.all[0].x + A.all[0].flength * cos(A.all[0].facing);

    A.all[0].heading.y = A.all[0].y + A.all[0].flength * sin(A.all[0].facing);

    if (A.all[0].heading.x < A.pad || A.all[0].heading.x > W - A.pad || A.all[0].heading.y < A.pad || A.all[0].heading.y > H - A.pad) {

      for (let its = 0; its < 5; its++) {

        A.all[0].facing = radians(random(degrees(A.all[0].facing) - (_range * (its+1) / 2), degrees(A.all[0].facing) + (_range * (its+1) / 2)));

        A.all[0].flength = random(A.all[0].r * 4, A.all[0].r * _maxv);

        A.all[0].heading.x = A.all[0].x + A.all[0].flength * cos(A.all[0].facing);

        A.all[0].heading.y = A.all[0].y + A.all[0].flength * sin(A.all[0].facing);

        if (A.all[0].heading.x > A.pad && A.all[0].heading.x < W - A.pad && A.all[0].heading.y > A.pad && A.all[0].heading.y < H - A.pad) {

         break; 

        }

      }

    }

    T = 0;

  } else {

    T++;

  }

​

  /*stroke(0, 255, 255);

  strokeWeight(10);

  point(A.all[0].heading.x, A.all[0].heading.y);

*/

  A.update(false, T);

}