Added extended unit settings

Added some code to enable the user to configure unit selection in a more
detailed fashion. you can now select either metric or imperial, or both,
and even set which one of those should be displayed first.

public_html/formatter.js

@@ -0,0 +1,170 @@
+var TrackDirections = ["North","Northeast","East","Southeast","South","Southwest","West","Northwest"];
+// formatting helpers
+
+// track in degrees (0..359)
+function format_track_brief(track) {
+	if (track === null){
+		return "";
+	}
+	
+	return Math.round(track);
+}
+
+// track in degrees (0..359)
+function format_track_long(track) {
+	if (track === null){
+		return "n/a";
+	}
+	
+	var trackDir = Math.floor((360 + track % 360 + 22.5) / 45) % 8;
+	return Math.round(track) + DEGREES + NBSP + "(" + TrackDirections[trackDir] + ")";
+}
+
+// altitude (input: alt in feet)
+// brief will always show either Metric or Imperial
+function format_altitude_brief(alt, vr) {
+	var alt_text;
+	
+	// 4 cases possible:
+	// 1: EnableMetric = true  | EnableImperial = false | PreferMetric = (Dont Care) -> display metric
+	// 2: EnableMetric = false | EnableImperial = true  | PreferMetric = (Dont Care) -> display imperial
+	// 3: EnableMetric = true  | EnableImperial = true  | PreferMetric = true        -> display metric
+	// 4: EnableMetric = true  | EnableImperial = true  | PreferMetric = false       -> display imperial
+	
+	if (alt === null){
+		return "";
+	} else if (alt === "ground"){
+		return "ground";
+	}
+	
+	if ((EnableMetric && !EnableImperial) || (PreferMetric && EnableMetric && EnableImperial)){
+		alt_text = Math.round(alt / 3.2828) + NBSP; // Altitude to meters
+	} else {
+		alt_text = Math.round(alt) + NBSP;
+	}
+	
+	// Vertical Rate Triangle
+	if (vr > 128){
+		return alt_text + UP_TRIANGLE;
+	} else if (vr < -128){
+		return alt_text + DOWN_TRIANGLE;
+	} else {
+		return alt_text + NBSP;
+	}
+}
+
+// alt in ft
+function format_altitude_long(alt, vr) {
+	var alt_text = "";
+	
+	if (alt === null) {
+		return "n/a";
+	} else if (alt === "ground") {
+		return "on ground";
+	}
+	
+	// If we only want to see one of the two types
+	if((EnableMetric && !EnableImperial) || (!EnableMetric && EnableImperial)){
+		if(EnableMetric){
+			alt_text = Math.round(alt / 3.2828) + " m";
+		}
+		else{
+			alt_text = Math.round(alt) + " ft";
+		}
+	}
+	else{ // we want to see both, check PreferMetric for what order
+		if (PreferMetric) {
+			alt_text = Math.round(alt / 3.2828) + " m | " + Math.round(alt) + " ft";
+		} else {
+			alt_text = Math.round(alt) + " ft | " + Math.round(alt / 3.2828) + " m";
+		}
+	}
+	
+	if (vr > 128) {
+		return UP_TRIANGLE + NBSP + alt_text;
+	} else if (vr < -128) {
+		return DOWN_TRIANGLE + NBSP + alt_text;
+	} else {
+		return alt_text;
+	}
+}
+
+//input: speed in kts
+function format_speed_brief(speed) {
+	if (speed === null) {
+		return "";
+	}
+	
+	if ((EnableMetric && !EnableImperial) || (PreferMetric && EnableMetric && EnableImperial)){
+		return Math.round(speed * 1.852); // knots to kilometers per hour
+	} else {
+		return Math.round(speed); // knots
+	}
+}
+
+// speed in kts
+function format_speed_long(speed) {	
+	if (speed === null) {
+		return "n/a";
+	}
+	
+	// If we only want to see one of the two types
+	if((EnableMetric && !EnableImperial) || (!EnableMetric && EnableImperial)){
+		if(EnableMetric){
+			return Math.round(speed * 1.852) + " km/h";
+		}
+		else{
+			return Math.round(speed) + " kt";
+		}
+	}
+	else{ // we want to see both, check PreferMetric for what order
+		if (PreferMetric) {
+			return Math.round(speed * 1.852) + " km/h | " + Math.round(speed) + " kt";
+		} else {
+			return Math.round(speed) + " kt | " + Math.round(speed * 1.852) + " km/h";
+		}
+	}
+	
+}
+
+// dist in meters
+function format_distance_brief(dist) {
+	if (dist === null) {
+		return "";
+	}
+
+	if ((EnableMetric && !EnableImperial) || (PreferMetric && EnableMetric && EnableImperial)){
+		return (dist/1000).toFixed(1); // meters to kilometers
+	} else {
+		return (dist/1852).toFixed(1); // meters to nautocal miles
+	}
+}
+
+// dist in metres
+function format_distance_long(dist) {	
+	if (dist === null) {
+		return "n/a";
+	}
+	
+	// If we only want to see one of the two types
+	if((EnableMetric && !EnableImperial) || (!EnableMetric && EnableImperial)){
+		if(EnableMetric){
+			return (dist/1000).toFixed(1) + " km";
+		}
+		else{
+			return (dist/1852).toFixed(1) + " NM";
+		}
+	}
+	else{ // we want to see both, check PreferMetric for what order
+		if (PreferMetric) {
+			return (dist/1000).toFixed(1) + " km | " + (dist/1852).toFixed(1) + " NM";
+		} else {
+			return (dist/1852).toFixed(1) + " NM | " + (dist/1000).toFixed(1) + " km";
+		}
+	}
+}
+
+// p as a LatLng
+function format_latlng(p) {
+	return p.lat().toFixed(3) + DEGREES + "," + NBSP + p.lng().toFixed(3) + DEGREES;
+}