From 73b09270c54acab810c10a80bed1d77c1a7bb2ab Mon Sep 17 00:00:00 2001
From: LalleSX
Date: Sat, 24 Oct 2026 14:58:21 +0200
Subject: Tilføj dansk

---
 src/experiments.ts | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

(limited to 'src/experiments.ts')

diff --git a/src/experiments.ts b/src/experiments.ts
index 6045a88..d4d2bc2 100644
--- a/src/experiments.ts
+++ b/src/experiments.ts
@@ -1,3 +1,4 @@
+import { getLanguage, word } from './i18n';
 import { electricField, type Charge } from './physics/electricField';
 import { capacitor, conductor, forceOn, gaussianFlux, pairEnergy, potential, semiconductor } from './physics/models';
 
@@ -31,7 +32,15 @@ export function format(value: number, digits = 2): string {
   if (Math.abs(value) < 0.01 || Math.abs(value) >= 1e5) return value.toExponential(2);
   return value.toLocaleString('en', { maximumFractionDigits: digits });
 }
-const metric = (label: string, value: number, unit: string): Measurement => ({ label, value: format(value), unit });
+export function formatDisplay(value: number, digits = 2): string {
+  if (getLanguage() !== 'da') return format(value, digits);
+  if (!Number.isFinite(value)) return 'Udefineret';
+  if (value === 0) return '0';
+  const locale = 'da-DK';
+  if (Math.abs(value) < 0.01 || Math.abs(value) >= 1e5) return value.toLocaleString(locale, { notation: 'scientific', maximumFractionDigits: 2 });
+  return value.toLocaleString(locale, { maximumFractionDigits: digits });
+}
+const metric = (label: string, value: number, unit: string): Measurement => ({ label, value: formatDisplay(value), unit });
 const textbook = (page: string) => ({ title: 'OpenStax · University Physics', url: `https://openstax.org/books/university-physics-volume-2/pages/${page}` });
 export function chargePair(p: Parameters): Charge[] {
   const half = number(p, 'separation') / 2;
@@ -68,7 +77,7 @@ export const experiments: Experiment[] = [
       const charges = chargePair(p);
       const e = electricField({ x: 0, y: 0, z: 0 }, charges);
       const f = forceOn(charges[1], [charges[0]]);
-      return [metric('|E| at origin', Math.hypot(e.x, e.y, e.z), 'N/C'), metric('|Force on right charge|', Math.hypot(f.x, f.y, f.z) * 1e9, 'nN'), { label: 'Interaction', value: p.configuration === 'like' ? 'Repulsive' : 'Attractive', unit: '' }];
+      return [metric('|E| at origin', Math.hypot(e.x, e.y, e.z), 'N/C'), metric('|Force on right charge|', Math.hypot(f.x, f.y, f.z) * 1e9, 'nN'), { label: 'Interaction', value: word(p.configuration === 'like' ? 'Repulsive' : 'Attractive'), unit: '' }];
     },
   },
   {
@@ -85,7 +94,7 @@ export const experiments: Experiment[] = [
     measure: p => {
       const q = { x: number(p, 'position'), y: 0, z: 0, coulombs: number(p, 'charge') * 1e-9 };
       const flux = gaussianFlux([q], number(p, 'radius'));
-      return [metric('Net electric flux', flux, 'N·m²/C'), metric('Enclosed charge', Number.isNaN(flux) ? NaN : Math.abs(q.x) < number(p, 'radius') ? q.coulombs * 1e9 : 0, 'nC'), { label: 'Source location', value: Number.isNaN(flux) ? 'On surface' : Math.abs(q.x) < number(p, 'radius') ? 'Inside' : 'Outside', unit: '' }];
+      return [metric('Net electric flux', flux, 'N·m²/C'), metric('Enclosed charge', Number.isNaN(flux) ? NaN : Math.abs(q.x) < number(p, 'radius') ? q.coulombs * 1e9 : 0, 'nC'), { label: 'Source location', value: word(Number.isNaN(flux) ? 'On surface' : Math.abs(q.x) < number(p, 'radius') ? 'Inside' : 'Outside'), unit: '' }];
     },
   },
   {
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