Function computeMACD

src/components/ChartPanel.tsx:74–109

(bars: OHLCBar[])

}

function computeMACD(bars: OHLCBar[]): {
  macd: { time: number; value: number }[];
  signal: { time: number; value: number }[];
  histogram: { time: number; value: number; color: string }[];
} {
  if (bars.length < 26) return { macd: [], signal: [], histogram: [] };
  const closes = bars.map(b => b.close);
  const ema12 = computeEMA(closes, 12);
  const ema26 = computeEMA(closes, 26);
  const startIdx = 25;
  const difValues: number[] = [];
  const difSeries: { time: number; value: number }[] = [];
  for (let i = startIdx; i < bars.length; i++) {
    const dif = ema12[i] - ema26[i];
    difValues.push(dif);
    difSeries.push({ time: bars[i].time, value: dif });
  }
  const deaValues = computeEMA(difValues, 9);
  const deaSeries: { time: number; value: number }[] = [];
  const histSeries: { time: number; value: number; color: string }[] = [];
  for (let i = 0; i < deaValues.length; i++) {
    const time = difSeries[i].time;
    const dif = difValues[i];
    const dea = deaValues[i];
    const bar = (dif - dea) * 2;
    deaSeries.push({ time, value: dea });
    histSeries.push({
      time,
      value: bar,
      color: bar >= 0
        ? (bar >= (i > 0 ? (difValues[i - 1] - deaValues[i - 1]) * 2 : 0) ? "#22c55e" : "#22c55e88")
        : (bar <= (i > 0 ? (difValues[i - 1] - deaValues[i - 1]) * 2 : 0) ? "#ff4444" : "#ff444488"),
    });
  }
  return { macd: difSeries, signal: deaSeries, histogram: histSeries };
}

function dedupByTime<T extends { time: number }>(data: T[]): T[] {
  const map = new Map<number, T>();