use obstacle-in-path pathfinding

src/entity.js

@@ -25,7 +25,6 @@ export default class Entity {
   #logic = null
   #moving = false
   #path = []
-  #scheduledPathfinding = null
   #spawnPosition = new Vector2()
 
   static collider(x, y, radius) {
@@ -45,7 +44,6 @@ export default class Entity {
   get destination() { return this.#dest }
   get logic() { return this.#logic }
   get game() { return this.#game }
-  get scheduledPathfinding() { return this.#scheduledPathfinding }
   get spawnPosition() { return this.#spawnPosition }
   get x() { return this.position.x }
   get y() { return this.position.y }
@@ -53,19 +51,10 @@ export default class Entity {
   set destination(value) { this.#dest = value }
   set logic(value) { this.#logic = value }
   set game(value) { this.#game = value }
-  set scheduledPathfinding(value) { this.#scheduledPathfinding = value }
   set spawnPosition(value) { this.#spawnPosition = value }
   set x(value) { this.position.x = value }
   set y(value) { this.position.y = value }
 
-  get collider() {
-    return new SAT.Circle(new SAT.Vector(this.x, this.y), this.radius)
-  }
-
-  get colliders() {
-    return [this.collider]
-  }
-
   get unadjustedWaypoints() {
     const numberOfWaypoints = 8
     const margin = 1
@@ -86,6 +75,15 @@ export default class Entity {
     ])
   }
 
+  adjustWaypoint(waypoint, direction) {
+    return SATX.clamp(
+      waypoint.clone().add(direction.clone().multiplyScalar(this.radius)),
+      this.game?.width,
+      this.game?.height,
+      this.radius,
+    )
+  }
+
   attackAction(cursor) {
     this.moveAction(cursor, true)
   }
@@ -141,12 +139,20 @@ export default class Entity {
   // --- Actions above --- //
 
   collidables() {
-    const entityColliders = (this.game?.entities ?? []).filter((e) => e.id != this.id).map((e) => e.collider)
+    const entityColliders = (this.game?.entities ?? []).filter((e) => e.id != this.id).map((e) => e.collider())
-    const terrainColliders = (this.game?.terrains ?? []).map((t) => t.colliders).flat()
+    const terrainColliders = (this.game?.terrains ?? []).map((t) => t.colliders()).flat()
 
     return entityColliders.concat(terrainColliders)
   }
 
+  collider() {
+    return new SAT.Circle(new SAT.Vector(this.x, this.y), this.radius)
+  }
+
+  colliders() {
+    return [this.collider()]
+  }
+
   cooldown(id) {
     this.cooldowns[id] = this.game?.currentTick ?? 0
   }
@@ -180,7 +186,7 @@ export default class Entity {
   }
 
   isColliding(...colliders) {
-    return SATX.collideObjects(this.collider, colliders)
+    return SATX.collideObjects(this.collider(), colliders)
   }
 
   respawn() {
@@ -221,14 +227,7 @@ export default class Entity {
     const terrainColliders = (this.game?.terrains ?? [])
     const unadjustedWaypoints = entityColliders.concat(terrainColliders).map((e) => e.unadjustedWaypoints).flat()
 
-    return unadjustedWaypoints.map(([waypoint, direction]) => {
+    return unadjustedWaypoints.map(([waypoint, direction]) => this.adjustWaypoint(waypoint, direction)) ?? []
-      return SATX.clamp(
-        waypoint.clone().add(direction.clone().multiplyScalar(this.radius)),
-        this.game?.width,
-        this.game?.height,
-        this.radius,
-      )
-    }) ?? []
   }
 
   #cast() {
@@ -255,7 +254,6 @@ export default class Entity {
     }
   }
 
-  // TODO: make scheduled pathfinding continue until collision to make the entity more "alive"
   #move(distanceTraveled = 0) {
     if (this.casting != null) { return false }
 
@@ -278,28 +276,66 @@ export default class Entity {
 
     const collidables = this.collidables()
     const fixedDest = SATX.clamp(SATX.fixCollisions(this.#dest, collidables, this.radius), this.game?.width, this.game?.height, this.radius)
-    const tunnel = SATX.entityTunnel(this.position.x, this.position.y, fixedDest.x, fixedDest.y, this.radius)
-    const destinationInLineOfSight = !SATX.collideObjects(tunnel, collidables)
 
     if (this.#path.length > 0) {
-      if (!destinationInLineOfSight) {
+      const sectionDest = this.#path.at(0)
+      const sectionTunnel = SATX.entityTunnel(this.position.x, this.position.y, sectionDest.x, sectionDest.y, this.radius)
+      const lineOfSight = !SATX.collideObjects(sectionTunnel, collidables)
+      if (!lineOfSight) {
         this.#path = []
       }
     }
 
     if (this.#path.length < 1 || !this.#path.at(-1).equals(fixedDest)) {
-      if (destinationInLineOfSight) {
+      const tunnel = SATX.entityTunnel(this.position.x, this.position.y, fixedDest.x, fixedDest.y, this.radius)
+      const lineOfSight = !SATX.collideObjects(tunnel, collidables)
+      if (lineOfSight) {
         this.#path = [fixedDest]
       }
     }
 
-    if ((this.#path.length < 1 || !this.#path.at(-1).equals(fixedDest)) && (!this.#scheduledPathfinding || this.game?.currentTick % this.game?.tickRate == this.#scheduledPathfinding)) {
+    if ((this.#path.length < 1 || (this.#path.at(-1)?.distanceTo(fixedDest) ?? 0) > 0.01)) {
       const start = SATX.vectorToFloat32Array(this.position)
       const goal = SATX.vectorToFloat32Array(fixedDest)
-      const nonUniqueWaypoints = this.waypoints().map((w) => SATX.vectorToFloat32Array(w)).concat([start, goal])
+      const obstacles = []
-      const waypoints = Pathfind.uniqueWaypoints(nonUniqueWaypoints)
+
-      const graph = Pathfind.buildGraph(waypoints, collidables, this.radius)
+      for (let failsafe = 0; failsafe < 1000; failsafe++) {
-      this.#path = Pathfind.shortestPath(graph, start, goal).map((waypoint) => new Vector2(waypoint[0], waypoint[1]))
+        const waypoints = [
+          start,
+          goal,
+          ...obstacles.map((e) => e.unadjustedWaypoints.map(([w, d]) => SATX.vectorToFloat32Array(this.adjustWaypoint(w, d)))).flat()
+        ]
+
+        const colliders = obstacles.map((e) => e.colliders()).flat()
+        const graph = Pathfind.buildGraph(waypoints, colliders, this.radius)
+        const path = Pathfind.shortestPath(graph, start, goal).map((waypoint) => new Vector2(waypoint[0], waypoint[1]))
+
+        if (path.length == 0) { break } // goal unreachable
+
+        let obstacleInPath = false
+        let lastSection = this.position
+        for (const section of path) {
+          const tunnel = SATX.entityTunnel(lastSection.x, lastSection.y, section.x, section.y, this.radius)
+          const globalObstacles = this.game.terrains.concat(this.game.entities.filter((e) => e.id != this.id))
+          const sectionObstacles = SATX.collideObstacles(tunnel, globalObstacles)
+          if (sectionObstacles.length > 0) {
+            obstacleInPath = true
+            const obstacleIds = obstacles.map((o) => o.id)
+            for (const obstacle of sectionObstacles) {
+              if (!obstacleIds.includes(obstacle.id)) {
+                obstacles.push(obstacle)
+              }
+            }
+          }
+
+          lastSection = section
+        }
+
+        if (!obstacleInPath) {
+          this.#path = path
+          break
+        }
+      }
     }
 
     if (this.#path.length > 0) {

src/game.js

@@ -4,18 +4,22 @@ import Projectile from './projectile.js'
 import Terrain from './terrain.js'
 
 export default class Game {
-  tickRate = 30
+  averageTick = 0
   currentTick = 0
-  width = 2000
   height = 2000
-  nextTickAt = 0
+  secondToSlowestTick = 0
+  tickRate = 30
+  width = 2000
 
-  #logic = null
+  #currentTiming = 0
   #entities = []
   #eventEmitter = new EventEmitter()
+  #logic = null
+  #nextTickAt = 0
   #projectiles = []
   #terrains = []
   #tickBudget = 1000 / this.tickRate
+  #timings = new Float32Array(this.tickRate)
 
   get logic() { return this.#logic }
   get entities() { return this.#entities }
@@ -84,23 +88,8 @@ export default class Game {
     }
   }
 
-  gameLoop() {
-    const tickBudget = this.#tickBudget
-
-    if (this.nextTickAt != null) {
-      const nextTickAt = this.nextTickAt
-      this.nextTickAt = null
-
-      let start = performance.now()
-      while (start < nextTickAt) { start = performance.now() }
-
-      this.update()
-      this.nextTickAt = start + tickBudget
-    }
-  }
-
   start() {
-    setInterval(() => this.gameLoop(), 1)
+    setInterval(() => this.#gameLoop(), 1)
   }
 
   update() {
@@ -110,7 +99,41 @@ export default class Game {
       this.#logic()
     }
 
-    this.currentTick++
+    this.#calculateTickMetrics()
     this.eventEmitter.emit('tick')
+
+    this.currentTick++
+  }
+
+  #calculateTickMetrics() {
+    this.averageTick = Math.floor(10 * this.#timings.reduce((sum, t) => sum += t, 0) / this.#timings.length) / 10
+    this.secondToSlowestTick = Math.floor(10 * this.#timings.toSorted().at(-2)) / 10
+  }
+
+  #gameLoop() {
+    const tickBudget = this.#tickBudget
+
+    if (this.#nextTickAt != null) {
+      const nextTickAt = this.#nextTickAt
+      this.#nextTickAt = null
+
+      let start = 0
+      while (start < nextTickAt) { start = performance.now() }
+
+      const before = performance.now()
+      this.update()
+      this.#nextTickAt = start + tickBudget
+      const after = performance.now()
+      const taken = (after - before)
+
+      this.#timings[this.#currentTiming] = taken
+      if (this.#currentTiming++ > this.#timings.length) {
+        this.#currentTiming = 0
+      }
+
+      if (after - before > tickBudget) {
+        console.warn(`Can't keep up! A tick took ${taken.toFixed(1)} ms (Budget: ${tickBudget.toFixed(1)} ms)`)
+      }
+    }
   }
 }

src/index.js

@@ -118,6 +118,16 @@ function laneScenario() {
     }
   }
   game.logic = gameLogic
+
+  // const uBottomPoints = [
+  //   midSouthWallPoints.at(0).clone().sub(midWallThickness),
+  //   midSouthWallPoints.at(1).clone().sub(midWallThickness),
+  //   midNorthWallPoints.at(-2).clone().add(midWallThickness),
+  //   midNorthWallPoints.at(-1).clone().add(midWallThickness),
+  // ]
+  // const uBottom = new Terrain(uBottomPoints)
+  // uBottom.id = 'uBottom'
+  // game.addTerrain(uBottom)
 }
 
 app.listen(port, () => {

src/projectile.js

@@ -33,7 +33,7 @@ export default class Projectile {
     (this.game?.entities ?? []).filter((e) => e.id != this.id).forEach((e) => {
       if (e.id == this.owner?.id) { return }
 
-      if (SATX.collideObject(this.collider(), e.collider)) {
+      if (SATX.collideObject(this.collider(), e.collider())) {
         this.onCollide(this, e)
       }
     })

src/satx.js

@@ -41,8 +41,12 @@ export default class SATX {
     return false
   }
 
-  static collideObjects(collider1, colliders) {
+  static collideObjects(collider, colliders) {
-    return colliders.some((c) => this.collideObject(collider1, c))
+    return colliders.some((c) => this.collideObject(collider, c))
+  }
+
+  static collideObstacles(collider, obstacles) {
+    return obstacles.filter((obstacle) => obstacle.colliders().some((c) => this.collideObject(collider, c)))
   }
 
   static enclosingRegularPolygonRadius(numberOfVertices) {

src/template.js

@@ -33,11 +33,12 @@ export default class Template {
     }
   }
 
-  // TODO: fix disabled incremental pathing causes lag spikes
   // TODO: minion aggro
+  // TODO: incremental pathfinding stuck in thicker than recalculateDestRadius walls
   static #minionLogic(route = []) {
     const checkpointSize = 300
-    const incrementalPathing = 100
+    const maxDestDistance = 100
+    const recalculateDestRadius = 50
 
     return function builtMinionLogic() {
       const entity = this
@@ -46,7 +47,6 @@ export default class Template {
       if (route.length > 0) {
         const routeIndex = entity.memory.routeCheckpoint ?? 0
         const goal = route[routeIndex].clone()
-        const currentTick = entity.game?.currentTick ?? 0
         if (goal instanceof Vector2) {
           if (entity.distanceTo(goal) < checkpointSize) {
             if (routeIndex + 1 < route.length) {
@@ -54,21 +54,16 @@ export default class Template {
             }
           }
 
-          if ((entity.memory.incrementalPathingTimeout ?? -Infinity) < currentTick) {
+          if ((entity.destination?.distanceTo(entity.position) ?? 0) < recalculateDestRadius) {
             const distanceToGoal = entity.distanceTo(goal)
-            if (distanceToGoal > entity.memory.distanceToGoal ?? -Infinity) {
+            if (distanceToGoal > maxDestDistance) {
-              entity.memory.incrementalPathingTimeout = currentTick + (1 * (entity.game.tickRate ?? 1))
+              const direction = goal.clone().sub(entity.position).normalize().multiplyScalar(maxDestDistance)
-            }
-            else if (distanceToGoal > incrementalPathing) {
-              const direction = goal.clone().sub(entity.position).normalize().multiplyScalar(incrementalPathing)
               goal.copy(entity.position.clone().add(direction))
             }
 
-            entity.memory.distanceToGoal = distanceToGoal
-          }
-
             entity.attackAction(goal)
           }
+        }
 
         if (entity.position.equals(route.at(-1))) {
           entity.despawn()

src/terrain.js

@@ -8,7 +8,6 @@ export default class Terrain {
   relativeVertices = []
 
   #colliders = []
-  #hull = null
   #vertices = []
   #unadjustedWaypoints = []
 
@@ -24,7 +23,6 @@ export default class Terrain {
     this.#calculateUnadjustedWaypoints()
   }
 
-  get colliders() { return this.#colliders }
   get unadjustedWaypoints() { return this.#unadjustedWaypoints }
   get vertices() { return this.#vertices }
 
@@ -45,6 +43,8 @@ export default class Terrain {
     ]
   }
 
+  colliders() { return this.#colliders }
+
   state() {
     return {
       ...this,