From b3a83b2fdd5b406d020398e7c3cf6f46149a2523 Mon Sep 17 00:00:00 2001
From: Martin Kagamino Lehoux <martin@lehoux.net>
Date: Fri, 21 Aug 2026 19:07:31 +0200
Subject: Add global analytics scatter chart

---
 web/frontend/analytics-logic.ts | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 web/frontend/analytics-logic.ts

(limited to 'web/frontend/analytics-logic.ts')

diff --git a/web/frontend/analytics-logic.ts b/web/frontend/analytics-logic.ts
new file mode 100644
index 0000000..7a53944
--- /dev/null
+++ b/web/frontend/analytics-logic.ts
@@ -0,0 +1,35 @@
+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)}`);
-- 
cgit v1.3