fgdata/gui/dialogs/seaport.xml

<?xml version="1.0"?>

<PropertyList>
	<name>seaport</name>
	<layout>vbox</layout>

	<nasal>
		<!--
			Our coastlines are too unrealiable to just teleport to the nearest seaport.
			We may have to search around its reported location until we actually find water.
		-->
		<open>
			var label = cmdarg().getNode("text/label");
			var apt = airportinfo("seaport");
			var rwys = apt.runways;
			var lat = apt.lat;
			var lon = apt.lon;

			label.setValue("  The nearest seaport is \"" ~ apt.name ~ "\" (" ~ apt.id ~ ")  ");

			var goto_seaport = func {
				var rwyid = keys(rwys)[0];
				var rwy = rwys[rwyid];
				print("SP: going to seaport ", apt.id, "/", rwyid, "  (\"", apt.name, "\")");
				setprop("/sim/presets/airport-id", apt.id);
				teleport(rwy.lat, rwy.lon);
				settimer(verify, 4);
			}

			var verify = func {
				var p = geo.aircraft_position();
				if (on_water(p.lat(), p.lon())) {
					print("SP: seaport center is on water");
					return;
				}

				foreach (var r; keys(rwys)) {
					print("SP: trying runway ", r);
					var lat = rwys[r].lat;
					var lon = rwys[r].lon;
					if (on_water(lat, lon)) {
						setprop("/sim/presets/runway", r);
						setprop("/sim/presets/heading-deg", rwys[r].heading);
						print("SP: runway ", r, " is on water");
						return teleport(lat, lon);
					}
				}

				print("SP: trying circle");
				for (var dist = 500; dist &lt;= 1500; dist += 500) {
					print("SP:\tat distance ", dist, " m");

					for (var course = 0; course &lt; 360; course += 60) {
						print("SP:\t\tat course ", course, " degree");

						p.set_latlon(apt.lat, apt.lon);
						p.apply_course_distance(course, dist);
						if (on_water(p.lat(), p.lon())) {
							print("SP: found water");
							setprop("/sim/presets/heading-deg", course);
							return teleport(p.lat(), p.lon());
						}
					}
				}

				print("SP: no water found");
			}

			var teleport = func(lat, lon) {
				setprop("/sim/presets/latitude-deg", lat);
				setprop("/sim/presets/longitude-deg", lon);
				fgcommand("reposition");
			}

			var on_water = func(lat, lon) {
				var g = geodinfo(lat, lon);
				return g != nil and g[1] != nil and !g[1].solid;
			}
		</open>
	</nasal>

	<group>
		<layout>hbox</layout>
		<empty><stretch>1</stretch></empty>

		<text>
			<label>Location inappropriate for a seaplane</label>
		</text>

		<empty><stretch>1</stretch></empty>
	</group>

	<hrule/>

	<text>
		<label></label>
	</text>

	<group>
		<layout>hbox</layout>
		<button>
			<legend>Stay anyway</legend>
			<equal>1</equal>
			<key>Esc</key>
			<binding>
				<command>dialog-close</command>
			</binding>
		</button>

		<button>
			<legend>Go to seaport</legend>
			<default>1</default>
			<equal>1</equal>
			<binding>
				<command>nasal</command>
				<script>goto_seaport()</script>
			</binding>
			<binding>
				<command>dialog-close</command>
			</binding>
		</button>
	</group>
</PropertyList>