editor: Add reverse backwards drawing mode and improve the reset handler

htdocs/streeteditor.js

@@ -1,6 +1,7 @@
 const queryString = window.location.search;
 const urlParams = new URLSearchParams(queryString);
 editor_mode = urlParams.has('editor');
+
 if (editor_mode) {
 	var draw_layer;
 	var polyline;
@@ -13,13 +14,21 @@ if (editor_mode) {
 		return latlng;
 	}
 
-	function start_editing(e) {
+	function start_editing(dir = 1) {
 		// TODO: Check whether we already are in edit mode
 		// TODO: Detect whether we are cloner to the tail or the head, and issue Fwd or Bwd accordingly
-		if (polyline)
+		if (polyline) {
-			polyline.editor.continueForward();
+			if (dir)
-		else
+				polyline.editor.continueForward();
+			else
+				polyline.editor.continueBackward();
+		} else {
 			polyline = mymap.editTools.startPolyline();
+		}
+	}
+
+	function start_reverse_editing() {
+		start_editing(0);
 	}
 
 	function strToPoints(str) {
@@ -41,10 +50,6 @@ if (editor_mode) {
 	}
 
 	function onLoad(interactive = 1) {
-		if (polyline) {
-				polyline.remove(mymap);
-				polyline = undefined;
-		}
 		if (interactive) {
 			str = prompt("Instructions: \n" +
 			"* Click the scribble-icon in the top left to start or continue drawing.\n" +
@@ -52,10 +57,17 @@ if (editor_mode) {
 			"* Double click a waypoint to delete it.\n" +
 			"* Click save in the top right to get the new string.\n\n" +
 			"Enter existing waypoints in the following format: [x,y],[x,y]:", window.location.hash.slice(1));
+			if (!str)
+				return;
 		} else {
 			str = window.location.hash.slice(1);
 		}
 
+		if (polyline) {
+				polyline.remove(mymap);
+				polyline = undefined;
+		}
+
 		if (str) {
 			coords = strToPoints(str);
 			for (var i = 0; i < coords.length; i++) {
@@ -97,7 +109,7 @@ if (editor_mode) {
 	}
 
 	function show_location_string(e) {
-		prompt("Copy this string back into the Wiki and wait for a few hours:", get_location_string());
+		prompt("Copy this string back into the Wiki and wait for the server to refresh the maps:", get_location_string());
 	}
 
 	function reset_path(e) {
@@ -131,7 +143,7 @@ if (editor_mode) {
 			position: 'topleft',
 			callback: reset_path,
 			title: 'Enter path coordinates',
-			html: '↺'
+			html: '📂'
 		}
 	});
 
@@ -139,11 +151,20 @@ if (editor_mode) {
 		options: {
 			position: 'topleft',
 			callback: start_editing,
-			title: 'Start editing',
+			title: 'Start editing (forward)',
 			html: '\\/\\'
 		}
 	});
 
+	L.StartReverseEditControl = L.EditControl.extend({
+		options: {
+			position: 'topleft',
+			callback: start_reverse_editing,
+			title: 'Start editing (backward)',
+			html: '↺'
+		}
+	});
+
 	L.NewLineControl = L.EditControl.extend({
 		options: {
 			position: 'topleft',
@@ -156,6 +177,7 @@ if (editor_mode) {
 	mymap.addControl(new L.NewLineControl());
 	mymap.addControl(new L.ResetPathControl());
 	mymap.addControl(new L.StartEditControl());
+	mymap.addControl(new L.StartReverseEditControl());
 
 	onLoad();
 }