Function switchCandleCount

examples/candlestick-streaming/main.ts:353–428

* Switch to a different candle count. * Regenerates historical data and recreates the chart view.

(count: number)

 * Regenerates historical data and recreates the chart view.
 */
function switchCandleCount(count: number) {
  // Skip if already at this count
  if (count === currentCandleCount) {
    return;
  }

  // Remember if we were streaming
  const wasStreaming = isStreaming;

  // Stop streaming while we regenerate
  if (isStreaming) {
    tickSimulator.stop();
  }

  // Update candle count
  currentCandleCount = count;

  console.log(`Switching to ${count.toLocaleString()} candles`);

  // Regenerate historical data with new count
  const startGen = performance.now();
  data = generateHistoricalData({
    symbol: CONFIG.symbol,
    startPrice: CONFIG.startPrice,
    volatility: 0.03,
    candleCount: currentCandleCount,
    intervalMs: candleIntervalMs,
  });
  console.log(`Regenerated ${data.length.toLocaleString()} candles in ${(performance.now() - startGen).toFixed(0)}ms`);

  // Get last price for tick simulator
  const lastCandle = data[data.length - 1];
  const lastPrice = getClose(lastCandle);

  // Reset simulated time based on new data
  simulatedTimeMs = getTimestamp(lastCandle) + candleIntervalMs;
  lastSimPerfNow = performance.now();

  // Recreate candle aggregator
  candleAggregator = createCandleAggregator(candleIntervalMs);

  // Recreate tick simulator with current price
  tickSimulator = createTickSimulator({
    initialPrice: lastPrice,
    ticksPerSecond: CONFIG.ticksPerSecond,
    volatility: CONFIG.tickVolatility,
    onTick: handleTick,
  });

  // Update chart with new data and appropriate dataZoom config
  const series0 = fullChartOptions.series?.[0];
  if (series0 && series0.type === 'candlestick') {
    fullChartOptions = {
      ...fullChartOptions,
      dataZoom: getDataZoomConfig(currentCandleCount),
      series: [
        {
          ...series0,