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static/ema.js

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+/**
+ * Indicator Definition Object for EMA.
+ */
+const EMA_INDICATOR = {
+    name: 'EMA',
+    label: 'Exponential Moving Average',
+    usesBaseData: false, // This simple indicator uses the chart's currently displayed data
+    params: [
+        { name: 'period', type: 'number', defaultValue: 20, min: 2 },
+    ],
+    calculateFull: calculateFullEMA,
+};
+
+function calculateFullEMA(data, params) {
+    const period = params.period;
+    if (!data || data.length < period) return [];
+    let emaData = [];
+    const multiplier = 2 / (period + 1);
+    let sum = 0;
+    for (let i = 0; i < period; i++) {
+        sum += data[i].close;
+    }
+    let prevEma = sum / period;
+    emaData.push({ time: data[period - 1].time, value: prevEma });
+    for (let i = period; i < data.length; i++) {
+        const close = data[i].close;
+        const ema = (close - prevEma) * multiplier + prevEma;
+        emaData.push({ time: data[i].time, value: ema });
+        prevEma = ema;
+    }
+    return emaData;
+}