code: function createNoGoCircleSpecialAttractors(x, y, radius, impactDistance, type, direction) {
    var circleSubDiv = radius * SUBDIVISE_NOGO / 20;
    for( var i = 0; i < circleSubDiv; i++ ) {
      var specialAttractor = {};
      specialAttractor.x1 = (x + radius * Math.cos(2*Math.PI / circleSubDiv * i)) * pixelRatio;
      specialAttractor.y1 = (y + radius * Math.sin(2*Math.PI / circleSubDiv * i)) * pixelRatio;
      specialAttractor.x2 = (x + radius * Math.cos(2*Math.PI / circleSubDiv * (i+1))) * pixelRatio;
      specialAttractor.y2 = (y + radius * Math.sin(2*Math.PI / circleSubDiv * (i+1))) * pixelRatio;
      specialAttractor.impactDistance = impactDistance * pixelRatio;
      specialAttractor.type = type;
      specialAttractor.direction = direction;
      specialAttractors.push(specialAttractor);
      if(DEBUG_FLAG) {
        drawHelperCircle(specialAttractor.x1, specialAttractor.y1, 1);
      }
    }
  
    var bbox = {
      topLeft: {
        x: (x - radius) * pixelRatio,
        y: (y - radius) * pixelRatio,
      },
      bottomRight: {
        x: (x + radius) * pixelRatio,
        y: (y + radius) * pixelRatio,
      },
    };
  
    specialAttractorsBoundingBoxes.push(bbox);
    noGoBBoxes.push(bbox);
  }
docs: Creates a circular no go zone