From 4c4da95016645623eee9d9119e5a29bf8d1411d1 Mon Sep 17 00:00:00 2001
From: dominik-korsa <29484605+dominik-korsa@users.noreply.github.com>
Date: Wed, 16 Jul 2025 23:54:28 +0200
Subject: [PATCH] Flip derailer icon depending on the derailing direction

---
 .../map/object-renderers/DerailerRenderer.js  |  7 ++++++-
 src/helpers/constants.js                      |  1 +
 src/model/track-objects/derailer.js           | 19 ++++++++++++++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/components/map/object-renderers/DerailerRenderer.js b/src/components/map/object-renderers/DerailerRenderer.js
index ad20b0c..fad9eb1 100644
--- a/src/components/map/object-renderers/DerailerRenderer.js
+++ b/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'
diff --git a/src/helpers/constants.js b/src/helpers/constants.js
index 770e5c2..a473f20 100644
--- a/src/helpers/constants.js
+++ b/src/helpers/constants.js
@@ -49,6 +49,7 @@ const Constants = {
         signalElemsUnknownSignText: true,
         connectTracksFailed: true,
         routeInvalidSegment: true,
+        derailerUnknownDirection: true,
     },
     errors: {
         invalidSceneryInfo: true
diff --git a/src/model/track-objects/derailer.js b/src/model/track-objects/derailer.js
index 357c360..07e8388 100644
--- a/src/model/track-objects/derailer.js
+++ b/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(