Nautical unit adapter with feet (#803)

docs/Changelog.md

@@ -2,6 +2,7 @@
 
 ## New since 0.15.0
 
+- Nautical unit adapter with feet [#803](https://github.com/mapsforge/vtm/pull/803)
 - Many other minor improvements and bug fixes
 - [Solved issues](https://github.com/mapsforge/vtm/issues?q=is%3Aclosed+milestone%3A0.16.0)
 

vtm/src/org/oscim/scalebar/NauticalImperialUnitAdapter.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2014 Christian Pesch
+ * Copyright 2014-2021 devemux86
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.scalebar;
+
+public class NauticalImperialUnitAdapter implements DistanceUnitAdapter {
+    public static final NauticalImperialUnitAdapter INSTANCE = new NauticalImperialUnitAdapter();
+    public static final double METER_FOOT_RATIO = 0.3048;
+    public static final int ONE_MILE = 6076;
+    public static final int[] SCALE_BAR_VALUES = {30380000, 12152000, 6076000, 3038000, 1215200, 607600, 303800,
+            121520, 60760, 30380, 12152, 6076, 3038, 1000, 500, 200, 100, 50, 20, 10, 5, 2, 1};
+
+    @Override
+    public double getMeterRatio() {
+        return METER_FOOT_RATIO;
+    }
+
+    @Override
+    public int[] getScaleBarValues() {
+        return SCALE_BAR_VALUES;
+    }
+
+    @Override
+    public String getScaleText(int mapScaleValue) {
+        if (mapScaleValue < ONE_MILE / 2) {
+            return mapScaleValue + " ft";
+        }
+        if (mapScaleValue == ONE_MILE / 2) {
+            return "0.5 nmi";
+        }
+        return (mapScaleValue / ONE_MILE) + " nmi";
+    }
+}