fix: Move getIndexAndFractions outside of worker

Author: vincentvdwal

src/utils/projections.ts

@@ -1,6 +1,14 @@
-import { degreesToRadians, lat2tile, lon2tile, radiansToDegrees, tile2lat, tile2lon } from './math';
-
-import type { Bounds, Domain } from '../types';
+import {
+	degreesToRadians,
+	getIndexFromLatLong,
+	lat2tile,
+	lon2tile,
+	radiansToDegrees,
+	tile2lat,
+	tile2lon
+} from './math';
+
+import type { Bounds, Domain, IndexAndFractions } from '../types';
 import type { DimensionRange } from '../types';
 
 export interface Projection {
@@ -551,3 +559,37 @@ export const getBoundsFromGrid = (
 	const maxLat = minLat + dy * ny;
 	return [minLon, minLat, maxLon, maxLat];
 };
+
+export const getIndexAndFractions = (
+	lat: number,
+	lon: number,
+	domain: Domain,
+	projectionGrid: ProjectionGrid | null,
+	ranges = [
+		{ start: 0, end: domain.grid.ny },
+		{ start: 0, end: domain.grid.nx }
+	],
+	latLonMinMax: [minLat: number, minLon: number, maxLat: number, maxLon: number]
+) => {
+	let indexObject: IndexAndFractions;
+	if (domain.grid.projection && projectionGrid) {
+		indexObject = projectionGrid.findPointInterpolated(lat, lon, ranges);
+	} else {
+		indexObject = getIndexFromLatLong(
+			lat,
+			lon,
+			domain.grid.dx,
+			domain.grid.dy,
+			ranges[1]['end'] - ranges[1]['start'],
+			latLonMinMax
+		);
+	}
+
+	return (
+		indexObject ?? {
+			index: NaN,
+			xFraction: 0,
+			yFraction: 0
+		}
+	);
+};

src/worker.ts

@@ -1,6 +1,11 @@
 import { hideZero, drawOnTiles } from './utils/variables';
 
-import { DynamicProjection, ProjectionGrid, type Projection } from './utils/projections';
+import {
+	DynamicProjection,
+	getIndexAndFractions,
+	ProjectionGrid,
+	type Projection
+} from './utils/projections';
 
 import {
 	tile2lat,
@@ -132,40 +137,6 @@ const drawArrow = (
 	}
 };
 
-const getIndexAndFractions = (
-	lat: number,
-	lon: number,
-	domain: Domain,
-	projectionGrid: ProjectionGrid | null,
-	ranges = [
-		{ start: 0, end: domain.grid.ny },
-		{ start: 0, end: domain.grid.nx }
-	],
-	latLonMinMax: [minLat: number, minLon: number, maxLat: number, maxLon: number]
-) => {
-	let indexObject: IndexAndFractions;
-	if (domain.grid.projection && projectionGrid) {
-		indexObject = projectionGrid.findPointInterpolated(lat, lon, ranges);
-	} else {
-		indexObject = getIndexFromLatLong(
-			lat,
-			lon,
-			domain.grid.dx,
-			domain.grid.dy,
-			ranges[1]['end'] - ranges[1]['start'],
-			latLonMinMax
-		);
-	}
-
-	return (
-		indexObject ?? {
-			index: NaN,
-			xFraction: 0,
-			yFraction: 0
-		}
-	);
-};
-
 self.onmessage = async (message) => {
 	if (message.data.type == 'GT') {
 		const key = message.data.key;