From 065d7f4f8bf35fa9b465656bbed987c9a8944f87 Mon Sep 17 00:00:00 2001
From: Aditya <205600203+Rohilalala@users.noreply.github.com>
Date: Wed, 28 Oct 2026 15:15:16 +0530
Subject: [PATCH] =?UTF-8?q?fix(alpr):=20show=20a=20359.6=C2=B0=20camera=20?=
 =?UTF-8?q?bearing=20as=200=C2=B0,=20not=20360=C2=B0?=
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The selected ALPR card rounded a mapped camera:direction without
wrapping, so a camera facing 359.5° or more read "DIRECTION 360°". The
rounded bearing now wraps to 0°.
---
 docs/CURRENT-STATE.md            |  4 +++-
 src/layers/alpr/overlay.test.mjs | 18 ++++++++++++++++++
 src/layers/alpr/visuals.js       |  3 ++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index c55031a6a..dd595af17 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -894,7 +894,9 @@ change. Once the camera is still and tiles have settled, each overlay anchor is
 replaced once by the rendered surface under it (two depth samples per paint,
 accepted only within -30/+40 m of the floor cell), so badges do not float or
 sink on slopes; wedge corners follow their own floor cells instead of staying
-level with the apex. Unknown bearings never acquire a wedge. The row reads
+level with the apex. Unknown bearings never acquire a wedge. The selected
+card's `DIRECTION` wraps after rounding to whole degrees, so a mapped bearing
+of 359.5° or more reads `0°` rather than `360°`. The row reads
 `N nearby · M on screen`; when every loaded camera is outside the view it adds
 "None on screen — nearby cameras are outside the view" instead of looking
 unloaded. `scripts/qa-alpr-journey.mjs` drives an Austin journey with ALPR off,
diff --git a/src/layers/alpr/overlay.test.mjs b/src/layers/alpr/overlay.test.mjs
index 1bb9985af..c9aa8e5f5 100644
--- a/src/layers/alpr/overlay.test.mjs
+++ b/src/layers/alpr/overlay.test.mjs
@@ -2,6 +2,7 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import * as Cesium from 'cesium';
 import { createAlprOverlay } from './overlay.js';
+import { normalizeAlprNode } from './records.js';
 import {
   directionWedgePositions,
   alprLabelDetails,
@@ -218,6 +219,23 @@ test('adapter labels never claim a custom source is public OSM data', () => {
   );
 });
 
+test('a mapped bearing that rounds up to a whole turn reads 0°, not 360°', () => {
+  const direction = (tag) =>
+    alprLabelDetails(
+      normalizeAlprNode({
+        type: 'node',
+        id: 1,
+        lat: 30,
+        lon: -97,
+        tags: { 'surveillance:type': 'ALPR', 'camera:direction': tag },
+      }),
+      { label: 'Custom directory' },
+    ).find((line) => line.startsWith('DIRECTION'));
+  assert.equal(direction('359.6'), 'DIRECTION 0°');
+  assert.equal(direction('359.4'), 'DIRECTION 359°');
+  assert.equal(direction('0.4'), 'DIRECTION 0°');
+});
+
 test('overlay glyphs and native badges shrink alike with distance', () => {
   assert.equal(markerScale(100), 1.15);
   assert.equal(markerScale(40_000), 0.45);
diff --git a/src/layers/alpr/visuals.js b/src/layers/alpr/visuals.js
index 3a3d3fc5f..2a9202d92 100644
--- a/src/layers/alpr/visuals.js
+++ b/src/layers/alpr/visuals.js
@@ -49,8 +49,9 @@ export function alprLabelDetails(record, source) {
   const details = [
     sourceName === 'OpenStreetMap' ? 'OSM MAPPED' : `Source: ${sourceName}`,
   ];
+  // Wrap after rounding: 359.6° rounds to 360°, which is north.
   if (Number.isFinite(record.directionDeg))
-    details.push(`DIRECTION ${Math.round(record.directionDeg)}°`);
+    details.push(`DIRECTION ${Math.round(record.directionDeg) % 360}°`);
   const equipment = [
     ...new Set(
       [record.manufacturer, record.operator, record.cameraType]