draw

void draw() {

  calculate_delta_time();
  background(120);
  drawBorders();

  switch(mode) {
  case 1: //1 - gravitation
    if (field)
    {
      centralFieldManagement();
    } else
    {
      homogeneousFieldManagement();
    }

    break;
  case 2: //2 - pendulum
    if (pendul)
    {
      singlePendulumManagement();
    } else
    {
      dublePendulumManagement();
    }
    break;
  case 3: //3 - programs on whole screen
    background(0);

    if (wholeScreen)
    {
      noFill();
      table.show();
    } else
    {
      seq.drawing();
    }
    fill(200, 200, 200);
    break;
  case 4: // 4 - strenge circles
    if (cirOrNpendul)
    {
      strangeCirclesManagement();
    } else
    {
      nPendulManagement();
    }
    break;
  case 5: // 5 - fourier transformation
    noFill();
    background(0);
    fourier.show();
    break;
  }

  textSize(20);
  fill(10, 10, 10);

  if (mode == 3 || mode == 4|| mode == 5)
  {
    fill(200, 200, 200);
  }

  if (!stopStart)
  {
    contextMenu(currentIndex);
    changePositionByTheMouse(currentIndex);
  }

  checkingIfMouseIsOver();
  ButtonManagement();
}