allow users to set coordinate display type (#141)

2026-05-20 01:34:24 +08:00 · 2025-05-27 01:01:55 +08:00
parent e338c7190d
commit 626d3895aa
36 changed files with 516 additions and 144 deletions
@@ -0,0 +1,56 @@
+import {
+    type Coordinate,
+    CoordinateDisplayOrder,
+    CoordinateDisplayFormat,
+    CoordinateDirectionFormat,
+    CoordinateDisplayType,
+    getNormalizedCoordinate
+} from '@/core/coordinate.ts';
+
+export function formatCoordinate(value: Coordinate, coordinateDisplayType: number): string {
+    if (!value) {
+        return '';
+    }
+
+    value = getNormalizedCoordinate(value);
+
+    const displayType = CoordinateDisplayType.valueOf(coordinateDisplayType) || CoordinateDisplayType.Default;
+    const formattedLatitude = formatCoordinateValue(value.latitude, 'N', 'S', displayType.displayFormat, displayType.directionFormat);
+    const formattedLongitude = formatCoordinateValue(value.longitude, 'E', 'W', displayType.displayFormat, displayType.directionFormat);
+
+    if (displayType.displayOrder === CoordinateDisplayOrder.LatitudeLongitude) {
+        return `${formattedLatitude}, ${formattedLongitude}`;
+    } else if (displayType.displayOrder === CoordinateDisplayOrder.LongitudeLatitude) {
+        return `${formattedLongitude}, ${formattedLatitude}`;
+    } else {
+        return '';
+    }
+}
+
+function formatCoordinateValue(value: number, positiveDirectionName: string, negativeDirectionName: string, displayFormat: CoordinateDisplayFormat, directionFormat: CoordinateDirectionFormat): string {
+    let prefix = '';
+    let suffix = '';
+
+    if (directionFormat === CoordinateDirectionFormat.Signed) {
+        prefix = value >= 0 ? '' : '-';
+    } else if (directionFormat === CoordinateDirectionFormat.Directional) {
+        suffix = value >= 0 ? positiveDirectionName : negativeDirectionName;
+    }
+
+    value = Math.abs(value);
+
+    if (displayFormat === CoordinateDisplayFormat.DecimalDegrees) {
+        return `${prefix}${value.toFixed(6)}${suffix}`;
+    } else if (displayFormat === CoordinateDisplayFormat.DecimalMinutes) {
+        const degrees = Math.floor(value);
+        const minutes = (value - degrees) * 60;
+        return `${prefix}${degrees}°${minutes.toFixed(5)}'${suffix}`;
+    } else if (displayFormat === CoordinateDisplayFormat.DegreesMinutesSeconds) {
+        const degrees = Math.floor(value);
+        const minutes = Math.floor((value - degrees) * 60);
+        const seconds = (value - degrees - minutes / 60) * 3600;
+        return `${prefix}${degrees}°${minutes}'${seconds.toFixed(4)}"${suffix}`;
+    } else {
+        return '';
+    }
+}