Not Just Trading —
A Revolution in Market Intelligence

indicator "BollingerBands" { // Premium Indicator with Scoped Enums enum Source { Close = 0, Open = 1, High = 2, Low = 3 } parameters { int period = 20; double multiplier = 2.0; Source src = Source.Close; } display { separate_window: false; outputs: 3; buffer[0] { type: "line"; color: "#a91010ff"; name: "Upper Band"; width: 1; style: solid; }; buffer[1] { type: "line"; color: "#b0aaaaff"; name: "Middle Band"; width: 1; style: solid; }; buffer[2] { type: "line"; color: "#43c426ff"; name: "Lower Band"; width: 0.5; style: solid; }; fill { buffer_a: 0; buffer_b: 1; color: "rgba(219, 134, 134, 0.05)"; }; fill { buffer_a: 1; buffer_b: 2; color: "rgba(95, 217, 115, 0.1)"; }; } calculate() { double src_data[]; if (src == Source.Close) { src_data = close(); } else if (src == Source.Open) { src_data = open(); } else if (src == Source.High) { src_data = high(); } else if (src == Source.Low) { src_data = low(); } else { src_data = close(); } int len = length(src_data); double middle[] = create_array(len); double upper[] = create_array(len); double lower[] = create_array(len); for (int i = period - 1; i < len; i = i + 1) { double sum = 0.0; for (int j = 0; j < period; j = j + 1) { sum = sum + src_data[i - j]; } double mean = sum / period; middle[i] = mean; double sq_diff_sum = 0.0; for (int j = 0; j < period; j = j + 1) { double diff = src_data[i - j] - mean; sq_diff_sum = sq_diff_sum + (diff * diff); } double std_dev = sqrt(sq_diff_sum / period); upper[i] = mean + (multiplier * std_dev); lower[i] = mean - (multiplier * std_dev); } return [upper, middle, lower]; } }