Flip derailer icon depending on the derailing direction

src/components/map/object-renderers/DerailerRenderer.js

@@ -5,9 +5,14 @@ export default function DerailerRenderer(props) {
     const { object } = props;
     const [x, y] = object.pos.toSVGCoords();
 
+    let icon_transform = `translate(-2.835, -2.835)`;
+    if (object.is_left) {
+        icon_transform = 'scale(-1, 1) ' + icon_transform;
+    }
+
     return (
         <g className="derailer" transform={`translate(${x}, ${y}) rotate(${object.rot.y})`}>
-            <g className="derailer-icon" transform={`translate(-2.835, -2.835)`}>
+            <g className="derailer-icon" transform={icon_transform}>
                 <ReactSVG
                     src={`${process.env.PUBLIC_URL}/assets/derailer.svg`}
                     wrapper='svg'

src/helpers/constants.js

@@ -49,6 +49,7 @@ const Constants = {
         signalElemsUnknownSignText: true,
         connectTracksFailed: true,
         routeInvalidSegment: true,
+        derailerUnknownDirection: true,
     },
     errors: {
         invalidSceneryInfo: true

src/model/track-objects/derailer.js

@@ -1,9 +1,16 @@
 import TrackObject from './track-object';
 import Vector3 from '../vector3';
+import SceneryParserLog from "../scenery-parser-log";
 
 export default class Derailer extends TrackObject {
     type = "Derailer";
-    
+    is_left;
+
+    constructor(id, prefab_name, pos, rot, track_id, name) {
+        super(id, prefab_name, pos, rot, track_id, name);
+        this.is_left = Derailer._isLeft(prefab_name);
+    }
+
     getPrintableDerailerName() {
         return this.name || "Derailer";
     }
@@ -14,6 +21,16 @@ export default class Derailer extends TrackObject {
         return regex.test(prefabName);
     }
 
+    static _isLeft(prefabName) {
+        const regex = /^wykolejnica(?!_(?:latarnia|belka)).*_([lr])(?:[_,].+)?$/;
+        const match = regex.exec(prefabName);
+        if (match === null) {
+            SceneryParserLog.warn('derailerUnknownDirection', `Failed to determine the direction of derailer: ${prefabName}`);
+            return false;
+        }
+        return match[1] === 'l';
+    }
+
     static fromText(text) {
         const values = text.split(";");
         const obj = new Derailer(