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feat: add native road direction arrows

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que01
2026-08-14 18:05:21 +08:00
parent 822e6ef936
commit 1b9829d9ed
18 changed files with 386 additions and 11 deletions
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14
scripts/lib/turn-lane-arrows.js
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@@ -358,6 +358,18 @@ function addMeters(center, axis, axisDistance, right, rightDistance, meters) {
];
}
function arrowRingsAt(maneuver, center, axis, manifest = loadManifest()) {
const normalized = normalizeManeuver(maneuver);
if (!supportedAssets(manifest).has(normalized) || !Array.isArray(center) || !Array.isArray(axis)) return [];
const meters = metersForLat(center[1]);
const length = Math.hypot(axis[0], axis[1]);
if (!Number.isFinite(length) || length < 0.001) return [];
const forward = [axis[0] / length, axis[1] / length];
const right = [forward[1], -forward[0]];
return templateFor(normalized, manifest).map((template) => template.map(([rightMeters, forwardMeters]) =>
addMeters(center, forward, forwardMeters, right, rightMeters, meters)));
}
function templateFor(assetId, manifest = loadManifest()) {
const asset = supportedAssets(manifest).get(assetId);
if (!asset) throw new Error(`Unsupported or untested turn-lane asset: ${assetId}`);
@@ -487,4 +499,4 @@ function strokePolygon(points, width) {
return [...left, ...right, left[0]];
}
module.exports = { buildCustomTurnLaneArrows, loadManifest, normalizeManeuver, supportedAssets, templateFor };
module.exports = { arrowRingsAt, buildCustomTurnLaneArrows, loadManifest, normalizeManeuver, supportedAssets, templateFor };