web/frontend/analytics-logic.ts


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export const niceStep = (range: number, target: number): number => {
  if (range <= 0) return 1;
  const ideal = range / target;
  const magnitude = 10 ** Math.floor(Math.log10(ideal));
  let best = magnitude;
  let bestDistance = Number.POSITIVE_INFINITY;
  for (const factor of [1, 2, 5, 10]) {
    const candidate = factor * magnitude;
    const distance = Math.abs(candidate - ideal);
    if (distance < bestDistance) {
      bestDistance = distance;
      best = candidate;
    }
  }
  return best;
};

export const ticks = (min: number, max: number, target = 5): number[] => {
  const step = niceStep(max - min, target);
  const values: number[] = [];
  for (let value = Math.floor(min / step) * step; value <= max + 1e-9; value += step) {
    if (value >= min - 1e-9) values.push(roundStep(value));
  }
  return values;
};

const roundStep = (value: number): number => {
  if (!Number.isFinite(value) || value === 0) return 0;
  const decimals = Math.max(0, -Math.floor(Math.log10(value) + 1e-9));
  return Number(value.toFixed(decimals));
};

export const formatSpeed = (speed: number): string => `${speed.toFixed(1)}`;

export const formatCotacol = (cotacol: number): string => (cotacol >= 100 ? `${Math.round(cotacol)}` : `${cotacol.toFixed(1)}`);