Fix energy generator being not rotateable

src/js/game/buildings/energy_generator.js

@@ -14,10 +14,6 @@ export class MetaEnergyGenerator extends MetaBuilding {
         super("energy_generator");
     }
 
-    isRotateable(variant) {
-        return false;
-    }
-
     getSilhouetteColor() {
         return "#c425d7";
     }

src/js/game/components/energy_generator.js

@@ -1,5 +1,5 @@
 import { types } from "../../savegame/serialization";
-import { BaseItem } from "../base_item";
+import { BaseItem, enumItemType } from "../base_item";
 import { Component } from "../component";
 import { ShapeItem } from "../items/shape_item";
 
@@ -59,6 +59,22 @@ export class EnergyGeneratorComponent extends Component {
             // just destroy it
             return true;
         } else {
+            if (item.getItemType() !== enumItemType.shape) {
+                // This shouldn't happen since we have a filter - still, it doesn't hurt
+                // to check either
+                assertAlways(
+                    false,
+                    "Energy generator took wrong item: " +
+                        item.getItemType() +
+                        " on slot " +
+                        slot +
+                        " (waste slot = " +
+                        this.wasteAcceptorSlotIndex +
+                        ")"
+                );
+                return false;
+            }
+
             if (/** @type {ShapeItem} */ (item).definition.getHash() !== this.requiredKey) {
                 // Not our shape
                 return false;

src/js/game/systems/energy_generator.js

@@ -6,10 +6,14 @@ import { Entity } from "../entity";
 import { GameSystemWithFilter } from "../game_system_with_filter";
 import { POSITIVE_ENERGY_ITEM_SINGLETON } from "../items/positive_energy_item";
 import { ShapeDefinition } from "../shape_definition";
+import { Loader } from "../../core/loader";
+import { globalConfig } from "../../core/config";
 
 export class EnergyGeneratorSystem extends GameSystemWithFilter {
     constructor(root) {
         super(root, [EnergyGeneratorComponent]);
+
+        this.energyGeneratorOverlay = Loader.getSprite("sprites/misc/energy_generator_overlay.png");
     }
 
     draw(parameters) {
@@ -64,10 +68,18 @@ export class EnergyGeneratorSystem extends GameSystemWithFilter {
 
         const pos = staticComp.getTileSpaceBounds().getCenter().toWorldSpace();
 
-        // TESTING
         const definition = ShapeDefinition.fromShortKey(energyGenComp.requiredKey);
         definition.draw(pos.x, pos.y, parameters, 30);
 
+        // Draw background
+        this.energyGeneratorOverlay.drawCachedCentered(
+            parameters,
+            pos.x,
+            pos.y,
+            globalConfig.tileSize * 2 + 8
+        );
+
+        // TODO
         const energyGenerated = 5;
 
         // deliver: Deliver