refactor tunnel to be exactly the same speed as belt

src/js/game/components/underground_belt.js

@@ -56,9 +56,8 @@ export class UndergroundBeltComponent extends Component {
         this.consumptionAnimations = [];
 
         /**
-         * Used only on reciever
-         * Reciever: Used to store which items are currently "travelling"
-         * @type {Array<[BaseItem, number]>} Format is [Item, ingame time to eject the item]
+         * Used only on reciever to store which items are currently "travelling"
+         * @type {Array<[BaseItem, number]>} Format is [Item, Tile progress]
          */
         this.pendingItems = [];
     }
@@ -66,30 +65,22 @@ export class UndergroundBeltComponent extends Component {
     /**
      * Tries to accept a tunneled item
      * @param {BaseItem} item
-     * @param {number} travelDistance How many tiles this item has to travel
-     * @param {number} beltSpeed How fast this item travels
-     * @param {number} now Current ingame time
+     * @param {number} travelDistance
+     * @param {number} startProgress The starting tile progress
      */
-    tryAcceptTunneledItem(item, travelDistance, beltSpeed, now) {
+    tryAcceptTunneledItem(item, travelDistance, startProgress = 0) {
         if (this.mode !== enumUndergroundBeltMode.receiver) {
             // Only receivers can accept tunneled items
             return false;
         }
-
         // Notice: We assume that for all items the travel distance is the same
-        const maxItemsInTunnel = (2 + travelDistance) / globalConfig.itemSpacingOnBelts;
+        const maxItemsInTunnel = travelDistance / globalConfig.itemSpacingOnBelts;
         if (this.pendingItems.length >= maxItemsInTunnel) {
             // Simulate a real belt which gets full at some point
             return false;
         }
 
-        // NOTICE:
-        // This corresponds to the item ejector - it needs 0.5 additional tiles to eject the item.
-        // So instead of adding 1 we add 0.5 only.
-        // Additionally it takes 1 tile for the acceptor which we just add on top.
-        const travelDuration = (travelDistance + 1.5) / beltSpeed / globalConfig.itemSpacingOnBelts;
-
-        this.pendingItems.push([item, now + travelDuration]);
+        this.pendingItems.push([item, startProgress]);
         return true;
     }
 }

src/js/game/game_system_manager.js

@@ -150,14 +150,14 @@ export class GameSystemManager {
 
         add("belt", BeltSystem);
 
-        add("undergroundBelt", UndergroundBeltSystem);
-
         add("miner", MinerSystem);
 
         add("storage", StorageSystem);
 
         add("itemEjector", ItemEjectorSystem);
 
+        add("undergroundBelt", UndergroundBeltSystem);
+
         add("itemProcessor", ItemProcessorSystem);
 
         add("filter", FilterSystem);

src/js/game/systems/underground_belt.js

@@ -225,7 +225,11 @@ export class UndergroundBeltSystem extends GameSystemWithFilter {
         this.staleAreaWatcher.update();
 
         const sender = enumUndergroundBeltMode.sender;
-        const now = this.root.time.now();
+
+        const progressGrowth =
+            this.root.dynamicTickrate.deltaSeconds *
+            this.root.hubGoals.getBeltBaseSpeed() *
+            globalConfig.itemSpacingOnBelts;
 
         for (let i = 0; i < this.allEntities.length; ++i) {
             const entity = this.allEntities[i];
@@ -233,7 +237,7 @@ export class UndergroundBeltSystem extends GameSystemWithFilter {
             if (undergroundComp.mode === sender) {
                 this.handleSender(entity);
             } else {
-                this.handleReceiver(entity, now);
+                this.handleReceiver(entity, progressGrowth);
             }
         }
     }
@@ -253,8 +257,8 @@ export class UndergroundBeltSystem extends GameSystemWithFilter {
 
         // Search in the direction of the tunnel
         for (
-            let searchOffset = 0;
-            searchOffset < globalConfig.undergroundBeltMaxTilesByTier[undergroundComp.tier];
+            let searchOffset = 1;
+            searchOffset < globalConfig.undergroundBeltMaxTilesByTier[undergroundComp.tier] + 1;
             ++searchOffset
         ) {
             currentTile = currentTile.add(searchVector);
@@ -281,6 +285,9 @@ export class UndergroundBeltSystem extends GameSystemWithFilter {
                 break;
             }
 
+            console.log("distance: " + searchOffset);
+            // make sure to link the other way as well
+            receiverUndergroundComp.cachedLinkedEntity = { entity: null, distance: searchOffset };
             return { entity: potentialReceiver, distance: searchOffset };
         }
 
@@ -310,13 +317,13 @@ export class UndergroundBeltSystem extends GameSystemWithFilter {
 
         const input = acceptorComp.completedInputs.get(0);
         if (input) {
+            console.log("found input");
             // Check if the receiver can accept it
             if (
                 cacheEntry.entity.components.UndergroundBelt.tryAcceptTunneledItem(
                     input.item,
                     cacheEntry.distance,
-                    this.root.hubGoals.getUndergroundBeltBaseSpeed(),
-                    this.root.time.now()
+                    input.extraProgress
                 )
             ) {
                 acceptorComp.completedInputs.delete(0);
@@ -327,20 +334,28 @@ export class UndergroundBeltSystem extends GameSystemWithFilter {
     /**
      *
      * @param {Entity} entity
-     * @param {number} now
+     * @param {number} progressGrowth
      */
-    handleReceiver(entity, now) {
+    handleReceiver(entity, progressGrowth) {
         const undergroundComp = entity.components.UndergroundBelt;
 
-        // Try to eject items, we only check the first one because it is sorted by remaining time
-        const nextItemAndDuration = undergroundComp.pendingItems[0];
-        if (nextItemAndDuration) {
-            if (now > nextItemAndDuration[1]) {
+        if (!undergroundComp.cachedLinkedEntity) return;
+        const distance = undergroundComp.cachedLinkedEntity.distance;
+
+        // Move items along
+        for (let i = 0; i < undergroundComp.pendingItems.length; i++) {
+            const itemAndProgress = undergroundComp.pendingItems[i];
+            if (itemAndProgress[1] < distance) {
+                itemAndProgress[1] += progressGrowth;
+            }
+
+            if (itemAndProgress[1] >= distance) {
                 const ejectorComp = entity.components.ItemEjector;
 
                 const nextSlotIndex = ejectorComp.getFirstFreeSlot();
                 if (nextSlotIndex !== null) {
-                    if (ejectorComp.tryEject(nextSlotIndex, nextItemAndDuration[0])) {
+                    const extraProgress = itemAndProgress[1] - distance;
+                    if (ejectorComp.tryEject(nextSlotIndex, itemAndProgress[0], extraProgress)) {
                         undergroundComp.pendingItems.shift();
                     }
                 }