Initial maidenhead implementation

src/maidenhead.vala

@@ -0,0 +1,38 @@
+
+// Ported from:
+// https://metacpan.org/release/MEH/Ham-Locator-0.1000/source/lib/Ham/Locator.pm
+
+namespace Hamlocator {
+    public class LocationToMaidenhead : Object {
+        private string l2m;
+
+        public LocationToMaidenhead() {
+            this.l2m = "abcdefghijklmnopqrstuvwxyz";
+        }
+
+        public string get_current_location (GClue.Location pos) {
+            double lat = pos.latitude + 90;
+            double lon = pos.longitude + 180;
+
+            // Field
+            double lat1 = (lat / 10) + 0.0000001;
+            double lon1 = (lon / 20) + 0.0000001;
+
+            string loc1 = @"$(this.l2m[Math.lround(Math.floor(lon1))])$(this.l2m[Math.lround(Math.floor(lat1))])".up();
+
+            // Square
+            double lat2 = 10 * (lat1 - Math.floor(lat1));
+            double lon2 = 10 * (lon1 - Math.floor(lon1));
+
+            string loc2 = @"$(Math.lround(Math.floor(lon2)))$(Math.lround(Math.floor(lat2)))";
+
+            // Subsquare
+            double lat3 = 24 * (lat1 - Math.floor(lat1));
+            double lon3 = 24 * (lon1 - Math.floor(lon1));
+
+            string loc3 = @"$(this.l2m[Math.lround(Math.floor(lon3))])$(this.l2m[Math.lround(Math.floor(lat3))])";
+
+            return @"$loc1$loc2$loc3";
+        }
+    }
+}

src/meson.build

@@ -2,7 +2,8 @@ hamlocator_sources = [
   'main.vala',
   'window.vala',
   'application.vala',
-  'location.vala'
+  'location.vala',
+  'maidenhead.vala'
 ]
 
 hamlocator_deps = [
@@ -18,6 +19,8 @@ hamlocator_sources += gnome.compile_resources('hamlocator-resources',
 )
 
 executable('hamlocator', hamlocator_sources,
-  vala_args: '--target-glib=2.50 --pkg=gio-2.0',  dependencies: hamlocator_deps,
+  vala_args: '--target-glib=2.50 --pkg=gio-2.0',
+  dependencies: hamlocator_deps,
+  link_args: '-lm',
   install: true,
 )