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static/bb.js

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+/**
+ * Indicator Definition Object for Bollinger Bands (BB).
+ * This object is used by the indicator manager to create and control the indicator.
+ */
+const BB_INDICATOR = {
+    name: 'BB',
+    label: 'Bollinger Bands (3 Sets)',
+    usesBaseData: true, // This indicator needs the raw 1m data for its own aggregation
+    params: [
+        { name: 'timeframe', type: 'number', defaultValue: 1440, min: 1, label: 'Timeframe (min)' },
+    ],
+    // Hardcoded internal parameters, no longer exposed to the user.
+    internalParams: {
+        bb1_len_upper: 16, bb1_std_upper: 1.9, bb1_len_lower: 17, bb1_std_lower: 1.5,
+        bb2_len_upper: 18, bb2_std_upper: 2.7, bb2_len_lower: 18, bb2_std_lower: 1.6,
+        bb3_len_upper: 16, bb3_std_upper: 2.6, bb3_len_lower: 16, bb3_std_lower: 1.8,
+    },
+    calculateFull: calculateFullBollingerBands,
+};
+
+/**
+ * Calculates all three sets of Bollinger Bands for the entire dataset.
+ * @param {Array<Object>} data An array of candle objects with 'close' and 'time' properties.
+ * @param {Object} params An object containing the indicator's parameters (only timeframe from UI).
+ * @returns {Object} An object containing arrays of data points for each band.
+ */
+function calculateFullBollingerBands(data, params) {
+    const { timeframe } = params;
+    const internal = BB_INDICATOR.internalParams;
+
+    // First, aggregate the base data into the desired timeframe for the BB calculation.
+    const aggregatedData = aggregateCandles(data, timeframe);
+    if (aggregatedData.length === 0) {
+        return { bb1_upper: [], bb1_lower: [], bb2_upper: [], bb2_lower: [], bb3_upper: [], bb3_lower: [] };
+    }
+
+    // Calculate each set of bands using the aggregated data
+    const bb1 = calculateBands(aggregatedData, internal.bb1_len_upper, internal.bb1_std_upper, internal.bb1_len_lower, internal.bb1_std_lower);
+    const bb2 = calculateBands(aggregatedData, internal.bb2_len_upper, internal.bb2_std_upper, internal.bb2_len_lower, internal.bb2_std_lower);
+    const bb3 = calculateBands(aggregatedData, internal.bb3_len_upper, internal.bb3_std_upper, internal.bb3_len_lower, internal.bb3_std_lower);
+
+    // Extend the last point of each band to the latest candle time
+    const lastCandleTime = data[data.length - 1].time;
+    const extendLine = (bandData) => {
+        if (bandData.length > 0) {
+            const lastPoint = bandData[bandData.length - 1];
+            if (lastPoint.time < lastCandleTime) {
+                bandData.push({ ...lastPoint, time: lastCandleTime });
+            }
+        }
+        return bandData;
+    };
+
+    return {
+        bb1_upper: extendLine(bb1.upper), bb1_lower: extendLine(bb1.lower),
+        bb2_upper: extendLine(bb2.upper), bb2_lower: extendLine(bb2.lower),
+        bb3_upper: extendLine(bb3.upper), bb3_lower: extendLine(bb3.lower),
+    };
+}
+
+/**
+ * Helper function to calculate a single set of upper and lower Bollinger Bands.
+ * @returns {{upper: Array<Object>, lower: Array<Object>}}
+ */
+function calculateBands(data, upperLength, upperStdDev, lowerLength, lowerStdDev) {
+    const upperBand = [];
+    const lowerBand = [];
+
+    // Calculate Upper Band
+    for (let i = upperLength - 1; i < data.length; i++) {
+        const slice = data.slice(i - upperLength + 1, i + 1);
+        const sma = slice.reduce((sum, candle) => sum + candle.close, 0) / upperLength;
+        const stdDev = Math.sqrt(slice.reduce((sum, candle) => sum + Math.pow(candle.close - sma, 2), 0) / upperLength);
+        upperBand.push({
+            time: slice[slice.length - 1].time,
+            value: sma + (stdDev * upperStdDev)
+        });
+    }
+
+    // Calculate Lower Band
+    for (let i = lowerLength - 1; i < data.length; i++) {
+        const slice = data.slice(i - lowerLength + 1, i + 1);
+        const sma = slice.reduce((sum, candle) => sum + candle.close, 0) / lowerLength;
+        const stdDev = Math.sqrt(slice.reduce((sum, candle) => sum + Math.pow(candle.close - sma, 2), 0) / lowerLength);
+        lowerBand.push({
+            time: slice[slice.length - 1].time,
+            value: sma - (stdDev * lowerStdDev)
+        });
+    }
+
+    return { upper: upperBand, lower: lowerBand };
+}