Working conveyors

src/game/game.ts

@@ -10,6 +10,7 @@ export default class Game {
     private world;
     private ui;
     private prevWorldPos: Point | null = null;
+    private prevFrame: number = performance.now();
 
     constructor(private canvas: HTMLCanvasElement, controls: HTMLElement) {
         window.addEventListener('resize', this.onResize);
@@ -108,7 +109,11 @@ export default class Game {
     }
 
     private loop = () => {
-        this.world.update();
+        const now = performance.now();
+        const dt = now - this.prevFrame;
+        this.prevFrame = now;
+
+        this.world.update(dt);
 
         this.graphics.clear();
 

src/game/renderer.ts

@@ -52,5 +52,9 @@ export const renderers: Renderers = {
                 ctx.fillRect(0.8, 0.2, 0.2, 0.6);
             }
         }
+        if (tile.resource) {
+            ctx.fillStyle = 'blue';
+            ctx.fillText(tile.resource.toString(2), 0.5, 0.65);
+        }
     }
 };

src/game/utils.ts

@@ -141,6 +141,13 @@ export const DIRECTION_VECTORS: Record<Direction, Point> = {
     [Direction.WEST]: [-1, 0],
     [Direction.EAST]: [1, 0],
 };
+export const NEXT_DIRECTION: Record<Direction, Direction> = {
+    [Direction.NONE]: Direction.NONE,
+    [Direction.NORTH]: Direction.EAST,
+    [Direction.SOUTH]: Direction.WEST,
+    [Direction.WEST]: Direction.NORTH,
+    [Direction.EAST]: Direction.SOUTH,
+};
 export const ALL_DIRECTIONS = [Direction.NORTH, Direction.EAST, Direction.SOUTH, Direction.WEST];
 export const movePoint = (point: Point, direction: Direction): Point => [
     point[0] + DIRECTION_VECTORS[direction][0],

src/game/world.ts

@@ -1,4 +1,4 @@
-import { ALL_DIRECTIONS, Direction, cyrb32, exp, getDirection, getOppositeDirection, movePoint, pointsEquals, trunc } from "./utils";
+import { ALL_DIRECTIONS, Direction, NEXT_DIRECTION, cyrb32, exp, getDirection, getOppositeDirection, movePoint, pointsEquals, trunc } from "./utils";
 
 export enum TileType {
     DESTINATION,
@@ -16,13 +16,15 @@ type Resource = number;
 
 interface Port {
     direction: PortDirection;
-    buffer?: Resource;
 }
 
 type Ports = Partial<Record<Direction, Port>>;
 
 interface BaseTile {
     ports: Ports;
+    nextOutput?: Direction;
+    resource?: Resource;
+    timer?: number;
 }
 
 interface TileDestination extends BaseTile {
@@ -47,8 +49,25 @@ interface TileConveyor extends BaseTile {
 export type Tile = TileDestination | TileSource | TileExtractor | TileConveyor;
 
 const id = (point: Point) => ((Math.floor(point[0]) & 0xFFFF) << 16) | Math.floor(point[1]) & 0xFFFF;
+const deid = (pid: number): Point => [(pid >> 16) & 0xFFFF, pid & 0xFFFF];
 
-export const getPortDirections = (ports: Partial<Record<Direction, any>>) => Object.keys(ports).map(k => +k as Direction);
+export const getPortDirections = (ports: Ports) => Object.keys(ports).map(k => +k as Direction);
+
+const findNextOutput = (ports: Ports, prevDirection?: Direction): Direction => {
+    const outputs = getPortDirections(ports).filter(d => d && ports[d]?.direction === PortDirection.OUTPUT);
+    if (outputs.length === 0) return Direction.NONE;
+
+    if (prevDirection) {
+        let nextDirection = NEXT_DIRECTION[prevDirection];
+        while (nextDirection !== prevDirection) {
+            if (outputs.includes(nextDirection)) break;
+            nextDirection = NEXT_DIRECTION[nextDirection]
+        }
+        return nextDirection;
+    } else {
+        return outputs[0];
+    }
+}
 
 export default class World {
     private world = new Map<number, Tile>();
@@ -108,11 +127,11 @@ export default class World {
                 if (existingTile?.type === TileType.SOURCE) {
                     const ports: Ports = {};
                     for (const direction of ALL_DIRECTIONS) {
-                        const oppositeDirection = getOppositeDirection(direction);
+                        const [neighbour, oppositeDirection] = this.getNeighbour(position, direction);
-                        const neighbourPos = movePoint(position, direction);
+                        if (neighbour) {
-                        const neighbour = this.getTile(neighbourPos);
+                            if (!neighbour.ports[oppositeDirection]) {
-                        if (neighbour && !neighbour.ports[oppositeDirection]) {
+                                neighbour.ports[oppositeDirection] = { direction: PortDirection.INPUT };
-                            neighbour.ports[oppositeDirection] = { direction: PortDirection.INPUT };
+                            }
                             ports[direction] = { direction: PortDirection.OUTPUT };
                         }
                     }
@@ -141,22 +160,16 @@ export default class World {
         const pid = id(position);
         const existingTile = this.world.get(pid);
         const type = existingTile?.type;
-        if (type === TileType.DESTINATION || type === TileType.SOURCE) {
+        if (type === TileType.DESTINATION) {
             return;
         }
         if (existingTile) {
             for (const direction of getPortDirections(existingTile.ports)) {                
-                const oppositeDirection = getOppositeDirection(direction);
+                const [neighbour, oppositeDirection] = this.getNeighbour(position, direction);
-                const neighbourPos = movePoint(position, direction);
-                const neighbour = this.getTile(neighbourPos);
                 if (neighbour) {
                     delete neighbour.ports[oppositeDirection];
                 }
             }
-        }
-        if (existingTile?.type === TileType.EXTRACTOR) {
-            this.world.set(pid, existingTile.source);
-        } else if (existingTile) {
             this.world.delete(pid);
         }
     }
@@ -175,20 +188,65 @@ export default class World {
     }
 
     private genTile(position: Point): Tile | null {
-        const pid = id(position);
         const hash = cyrb32(this.seed, ...position);
 
         if ((hash & 0xFF) === 42) {
             const resource = (hash >> 12) & 0xF || 1;
             const newTile: Tile = { type: TileType.SOURCE, resource, ports: {} };
-            this.world.set(pid, newTile);
             return newTile;
         }
 
         return null;
     }
 
-    update() {
+    private get tiles() {
+        return this.world.entries();
+    }
 
+    private getNeighbour(position: Point, direction: Direction): [Tile | null, Direction] {
+        const neighbourPosition = movePoint(position, direction);
+        const neighbour = this.getTile(neighbourPosition);
+        const oppositeDirection = getOppositeDirection(direction);
+
+        return [neighbour, oppositeDirection];
+    }
+
+    update(dt: number) {
+        for (const [pid, tile] of this.tiles) {
+            const position = deid(pid);
+            if (tile.timer && tile.timer > 0) {
+                tile.timer -= dt;
+            }
+
+            if (!tile.timer || tile.timer <= 0) {
+                switch (tile.type) {
+                    case TileType.EXTRACTOR:
+                    case TileType.CONVEYOR:
+                        if (tile.resource) {
+                            tile.nextOutput = findNextOutput(tile.ports, tile.nextOutput);
+                            if (tile.nextOutput) {
+                                const [neighbour, oppositeDirection] = this.getNeighbour(position, tile.nextOutput);
+
+                                if (neighbour?.ports[oppositeDirection]?.direction === PortDirection.INPUT && !neighbour.resource) {
+                                    neighbour.resource = tile.resource;
+                                    neighbour.timer = 300; // TODO remove hardcode
+                                    tile.resource = undefined;
+                                    tile.timer = 500;
+                                } else {
+                                    tile.timer = 100;
+                                }
+                            }
+                        }
+                        if (tile.type === TileType.EXTRACTOR && !tile.resource) {
+                            tile.resource = tile.source.resource;
+                        }
+                        break;
+                    case TileType.DESTINATION:
+                        // TODO count gathered
+                        tile.resource = undefined;
+                        break;
+                }
+            }
+        }
     }
 }