implement destroyers

src/core/PathFinding.ts

@@ -1,5 +1,6 @@
 import { PriorityQueue } from "@datastructures-js/priority-queue";
 import { Tile } from "./game/Game";
+import { manhattanDist } from "./Util";
 
 
 export class AStar {
@@ -82,20 +83,44 @@ export class PathFinder {
     }
 
     nextTile(curr: Tile, dst: Tile): Tile {
-        if (curr != this.curr || dst != this.dst || this.path == null) {
+        if (this.shouldRecompute(curr, dst)) {
             this.curr = curr
             this.dst = dst
             this.path = null
             this.aStar = new AStar(curr, dst)
-            if (this.aStar.compute(1000)) {
+            if (this.aStar.compute(50000)) {
                 this.path = this.aStar.reconstructPath()
             } else {
                 return null
             }
-        }
-        if (this.path.length == 0) {
-            return null
+            if (this.path.length > 0) {
+                this.path.shift()
+            }
         }
         return this.path.shift()
     }
+
+    private shouldRecompute(curr: Tile, dst: Tile) {
+        if (this.path == null || this.curr == null || this.dst == null) {
+            return true
+        }
+        const dist = manhattanDist(curr.cell(), dst.cell())
+        let tolerance = 10
+        if (dist > 50) {
+            tolerance = 10
+        } else if (dist > 25) {
+            tolerance = 5
+        } else if (dist > 10) {
+            tolerance = 3
+        } else {
+            tolerance = 0
+        }
+        if (manhattanDist(this.curr.cell(), curr.cell()) > tolerance) {
+            return true
+        }
+        if (manhattanDist(this.dst.cell(), dst.cell()) > tolerance) {
+            return true
+        }
+        return false
+    }
 }

src/core/execution/DestroyerExecution.ts

@@ -12,6 +12,8 @@ export class DestroyerExecution implements Execution {
     private target: MutableUnit = null
     private pathfinder = new PathFinder()
 
+    private patrolTile: Tile;
+
     // TODO: put in config
     private searchRange = 100
 
@@ -24,9 +26,11 @@ export class DestroyerExecution implements Execution {
     init(mg: MutableGame, ticks: number): void {
         this._owner = mg.player(this.playerID)
         this.mg = mg
+        this.patrolTile = mg.tile(this.cell)
     }
 
     tick(ticks: number): void {
+        // TODO: remove gold from player
         if (this.destroyer == null) {
             this.destroyer = this._owner.addUnit(UnitType.Destroyer, 0, this.mg.tile(this.cell))
             return
@@ -35,24 +39,46 @@ export class DestroyerExecution implements Execution {
             this.active = false
             return
         }
+        if (this.target != null && !this.target.isActive()) {
+            this.target = null
+        }
         if (this.target == null) {
             const ships = this.mg.units(UnitType.TransportShip)
-                .filter(u => manhattanDist(u.tile().cell(), this.destroyer.tile().cell()))
-                .filter(u => u.owner() != this.destroyer.owner())
+                .filter(u => manhattanDist(u.tile().cell(), this.destroyer.tile().cell()) < 100)
+                // .filter(u => u.owner() != this.destroyer.owner())
+                .filter(u => u != this.destroyer)
                 .filter(u => !u.owner().isAlliedWith(this.destroyer.owner()))
             if (ships.length == 0) {
+                if (manhattanDist(this.destroyer.tile().cell(), this.cell) > 5) {
+                    for (let i = 0; i < 1 + this.mg.ticks() % 2; i++) {
+                        const next = this.pathfinder.nextTile(this.destroyer.tile(), this.patrolTile)
+                        if (next == null) {
+                            this.target = null
+                            return
+                        }
+                        this.destroyer.move(next)
+                    }
+                }
                 return
             }
             // TODO: sort by distance
             this.target = ships[0]
         }
-        const next = this.pathfinder.nextTile(this.destroyer.tile(), this.target.tile())
-        if (next == null) {
+        if (manhattanDist(this.destroyer.tile().cell(), this.target.tile().cell()) < 5) {
+            this.target.delete()
             this.target = null
             return
         }
+        for (let i = 0; i < 1 + this.mg.ticks() % 2; i++) {
+            const next = this.pathfinder.nextTile(this.destroyer.tile(), this.target.tile())
+            if (next == null) {
+                this.target = null
+                console.warn(`target not found`)
+                return
+            }
+            this.destroyer.move(next)
+        }
 
-        this.destroyer.move(next)
     }
 
     owner(): MutablePlayer {