Add profiling, add better entities, add entity generator

engine/engine_pathfinding.go

@@ -14,7 +14,7 @@ type pathNode struct {
 	f int // total cost of this node
 }
 
-func FindPath(from Position, to Position, isPassable func(x, y int) bool) *Path {
+func FindPath(from Position, to Position, maxDistance int, isPassable func(x, y int) bool) *Path {
 	var openList = make([]*pathNode, 0)
 	var closedList = make([]*pathNode, 0)
 
@@ -28,8 +28,16 @@ func FindPath(from Position, to Position, isPassable func(x, y int) bool) *Path
 
 	var lastNode *pathNode
 
+	iteration := 0
+
 	for {
 
+		iteration++
+
+		if iteration >= maxDistance {
+			return nil
+		}
+
 		if len(openList) == 0 {
 			break
 		}

engine/engine_pathfinding_test.go

@@ -9,6 +9,7 @@ func BenchmarkPathfinding(b *testing.B) {
 	path := FindPath(
 		PositionAt(0, 0),
 		PositionAt(16, 16),
+		20,
 		func(x, y int) bool {
 			if x > 6 && x <= 16 && y == 10 {
 				return false

engine/engine_profiler.go

@@ -0,0 +1,24 @@
+package engine
+
+import (
+	"fmt"
+	"os"
+	"runtime/pprof"
+)
+
+func Profile(profileName string, what func()) {
+	// Create a CPU profile file
+	f, err := os.Create(fmt.Sprintf("%s.prof", profileName))
+	if err != nil {
+		panic(err)
+	}
+	defer f.Close()
+
+	// Start CPU profiling
+	if err := pprof.StartCPUProfile(f); err != nil {
+		panic(err)
+	}
+	defer pprof.StopCPUProfile()
+
+	what()
+}

game/game_context.go

@@ -1,13 +1,15 @@
 package game
 
 import (
+	"fmt"
 	"log"
 	"mvvasilev/last_light/engine"
-	"os"
 	"time"
+
+	"github.com/gdamore/tcell/v2"
 )
 
-const TICK_RATE int64 = 50 // tick every 50ms ( 20 ticks per second )
+const TickRate int64 = 1 // tick every 50ms ( 20 ticks per second )
 
 type GameContext struct {
 	renderContext *engine.RenderContext
@@ -34,6 +36,8 @@ func (gc *GameContext) Run() {
 	lastLoop := time.Now()
 	lastTick := time.Now()
 
+	tickRateText := engine.CreateText(0, 1, 16, 1, "0ms", tcell.StyleDefault)
+
 	for {
 		deltaTime := 1 + time.Since(lastLoop).Microseconds()
 		lastLoop = time.Now()
@@ -42,12 +46,14 @@ func (gc *GameContext) Run() {
 			gc.game.Input(e)
 		}
 
-		if time.Since(lastTick).Milliseconds() >= TICK_RATE {
-			stop := !gc.game.Tick(deltaTime)
+		deltaTickTime := time.Since(lastTick).Milliseconds()
+		if deltaTickTime >= TickRate {
+			tickRateText = engine.CreateText(0, 1, 16, 1, fmt.Sprintf("%vms", deltaTickTime), tcell.StyleDefault)
+
+			stop := !gc.game.Tick(deltaTickTime)
 
 			if stop {
 				gc.renderContext.Stop()
-				os.Exit(0)
 				break
 			}
 
@@ -55,6 +61,8 @@ func (gc *GameContext) Run() {
 		}
 
 		drawables := gc.game.CollectDrawables()
+		drawables = append(drawables, tickRateText)
+
 		gc.renderContext.Draw(deltaTime, drawables)
 	}
 }

game/model/entity.go

@@ -73,6 +73,10 @@ type Entity_StatsHolderComponent struct {
 	// StatModifiers []StatModifier
 }
 
+type Entity_SpeedComponent struct {
+	Speed int
+}
+
 type Entity_HealthComponent struct {
 	Health    int
 	MaxHealth int
@@ -82,6 +86,7 @@ type Entity_HealthComponent struct {
 type Entity interface {
 	UniqueId() uuid.UUID
 
+	Speed() *Entity_SpeedComponent
 	Named() *Entity_NamedComponent
 	Described() *Entity_DescribedComponent
 	Presentable() *Entity_PresentableComponent
@@ -94,6 +99,7 @@ type Entity interface {
 type BaseEntity struct {
 	id uuid.UUID
 
+	speed       *Entity_SpeedComponent
 	named       *Entity_NamedComponent
 	described   *Entity_DescribedComponent
 	presentable *Entity_PresentableComponent
@@ -135,6 +141,10 @@ func (be *BaseEntity) HealthData() *Entity_HealthComponent {
 	return be.damageable
 }
 
+func (be *BaseEntity) Speed() *Entity_SpeedComponent {
+	return be.speed
+}
+
 func CreateEntity(components ...func(*BaseEntity)) *BaseEntity {
 	e := &BaseEntity{
 		id: uuid.New(),
@@ -206,3 +216,11 @@ func WithHealthData(health, maxHealth int, isDead bool) func(e *BaseEntity) {
 		}
 	}
 }
+
+func WithSpeed(speed int) func(e *BaseEntity) {
+	return func(e *BaseEntity) {
+		e.speed = &Entity_SpeedComponent{
+			Speed: speed,
+		}
+	}
+}

game/model/entity_generator.go

@@ -0,0 +1,25 @@
+package model
+
+import "math/rand"
+
+type EntitySupplier func(x, y int) Entity
+
+type EntityTable struct {
+	table []EntitySupplier
+}
+
+func CreateEntityTable() *EntityTable {
+	return &EntityTable{
+		table: make([]EntitySupplier, 0),
+	}
+}
+
+func (igt *EntityTable) Add(weight int, createItemFunction EntitySupplier) {
+	for range weight {
+		igt.table = append(igt.table, createItemFunction)
+	}
+}
+
+func (igt *EntityTable) Generate(x, y int) Entity {
+	return igt.table[rand.Intn(len(igt.table))](x, y)
+}

game/model/entity_npcs.go

@@ -0,0 +1,41 @@
+package model
+
+import (
+	"mvvasilev/last_light/engine"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+type specialItemType ItemType
+
+const (
+	ImpClaws specialItemType = 100_000 + iota
+)
+
+func Entity_Imp(x, y int) Entity {
+	return CreateEntity(
+		WithName("Imp"),
+		WithDescription("A fiery little creature"),
+		WithHealthData(15, 15, false),
+		WithPosition(engine.PositionAt(x, y)),
+		WithPresentation('i', tcell.StyleDefault.Foreground(tcell.ColorDarkRed)),
+		WithSpeed(11),
+		WithStats(map[Stat]int{
+			Stat_Attributes_Constitution: 5,
+			Stat_Attributes_Dexterity:    10,
+			Stat_Attributes_Strength:     5,
+			Stat_Attributes_Intelligence: 7,
+		}),
+		WithInventory(BuildInventory(
+			Inv_WithDominantHand(createBaseItem(
+				ItemType(ImpClaws),
+				'v', "|||",
+				tcell.StyleDefault,
+				item_WithName("Claws", tcell.StyleDefault),
+				item_WithDamaging(func() (damage int, dmgType DamageType) {
+					return RollD4(1), DamageType_Physical_Slashing
+				}),
+			)),
+		)),
+	)
+}

game/model/entity_player.go

@@ -19,6 +19,7 @@ func CreatePlayer(x, y int, playerBaseStats map[Stat]int) *Player {
 			WithInventory(CreateEquippedInventory()),
 			WithStats(playerBaseStats),
 			WithHealthData(0, 0, false),
+			WithSpeed(10),
 		),
 	}
 

game/model/inventory.go

@@ -43,34 +43,44 @@ func (inv *BasicInventory) Push(i Item) (success bool) {
 
 	// Try to first find a matching item with capacity
 	for index, existingItem := range inv.contents {
-		if existingItem != nil && existingItem.Type() == itemType && existingItem.Quantifiable() != nil && i.Quantifiable() != nil {
+		if existingItem == nil {
+			continue
+		}
+
+		itemsAreSame := existingItem.Type() == itemType
+		bothItemsAreQuantifiable := existingItem.Quantifiable() != nil && i.Quantifiable() != nil
+
+		if itemsAreSame && bothItemsAreQuantifiable {
+			existingCurrent := existingItem.Quantifiable().CurrentQuantity
+			incomingCurrent := i.Quantifiable().CurrentQuantity
+			existingMax := existingItem.Quantifiable().MaxQuantity
+
 			// Cannot add even a single more item to this stack, skip it
 			if existingItem.Quantifiable().CurrentQuantity+1 > existingItem.Quantifiable().MaxQuantity {
 				continue
 			}
 
-			// Item has capacity, but is less than total new item stack. Split between existing, and a new stack.
-			if existingItem.Quantifiable().CurrentQuantity+i.Quantifiable().CurrentQuantity > existingItem.Quantifiable().MaxQuantity {
-				// get difference in quantities
-				diff := existingItem.Quantifiable().MaxQuantity - existingItem.Quantifiable().CurrentQuantity
+			total := existingCurrent + incomingCurrent
+			leftOver := engine.AbsInt(existingMax - total)
 
-				// set existing item quantity to max
-				existingItem.Quantifiable().CurrentQuantity = existingItem.Quantifiable().MaxQuantity
-
-				// set new item quantity to its current - diff
-				i.Quantifiable().CurrentQuantity -= i.Quantifiable().CurrentQuantity - diff
-
-				// Cannot pick up item, doing so would overflow the inventory
+			// Existing item is filled, and remained is turned into new stack
+			if leftOver > 0 {
+				// If we have don't have enough free slots, just say we can't push it
 				if index+1 >= inv.shape.Area() {
 					return false
 				}
 
+				existingItem.Quantifiable().CurrentQuantity = existingMax
+
+				i.Quantifiable().CurrentQuantity = leftOver
+
 				inv.contents[index+1] = i
 
 				return true
 			}
 
-			inv.contents[index] = i
+			// Otherwise, just set the existing item quantity to the total
+			existingItem.Quantifiable().CurrentQuantity = total
 
 			return true
 		}

game/model/inventory_equipped.go

@@ -35,6 +35,60 @@ func CreateEquippedInventory() *EquippedInventory {
 	}
 }
 
+func BuildInventory(manips ...func(*EquippedInventory)) *EquippedInventory {
+	ei := CreateEquippedInventory()
+
+	for _, m := range manips {
+		m(ei)
+	}
+
+	return ei
+}
+
+func Inv_WithOffHand(item Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		ei.offHand = item
+	}
+}
+
+func Inv_WithDominantHand(item Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		ei.dominantHand = item
+	}
+}
+
+func Inv_WithHead(item Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		ei.head = item
+	}
+}
+
+func Inv_WithChest(item Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		ei.chestplate = item
+	}
+}
+
+func Inv_WithLegs(item Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		ei.leggings = item
+	}
+}
+
+func Inv_WithShoes(item Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		ei.shoes = item
+	}
+}
+
+func Inv_WithContents(items ...Item) func(*EquippedInventory) {
+	return func(ei *EquippedInventory) {
+		for _, i := range items {
+			ei.Push(i)
+		}
+	}
+}
+
 func (ei *EquippedInventory) AtSlot(slot EquippedSlot) Item {
 	switch slot {
 	case EquippedSlotOffhand:

game/state/playing_state.go

@@ -2,6 +2,7 @@ package state
 
 import (
 	"fmt"
+	"math/rand"
 	"mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
 	"mvvasilev/last_light/game/systems"
@@ -15,8 +16,8 @@ type PlayingState struct {
 	turnSystem  *systems.TurnSystem
 	inputSystem *systems.InputSystem
 
-	player  *model.Player
-	someNPC model.Entity
+	player *model.Player
+	npcs   []model.Entity
 
 	eventLog   *engine.GameEventLog
 	uiEventLog *ui.UIEventLog
@@ -64,44 +65,38 @@ func CreatePlayingState(turnSystem *systems.TurnSystem, inputSystem *systems.Inp
 		case systems.InputAction_OpenInventory:
 			s.nextGameState = CreateInventoryScreenState(s.eventLog, s.dungeon, s.inputSystem, s.turnSystem, s.player, s)
 		case systems.InputAction_PickUpItem:
-			s.PickUpItemUnderPlayer()
-			complete = true
+			complete = PickUpItemUnderPlayer(s.eventLog, s.dungeon, s.player)
 		case systems.InputAction_Interact:
-			s.InteractBelowPlayer()
-			complete = true
+			complete = s.InteractBelowPlayer()
 		case systems.InputAction_OpenLogs:
 			s.viewShortLogs = !s.viewShortLogs
 		case systems.InputAction_MovePlayer_East:
-			s.MovePlayer(model.East)
-			complete = true
+			complete = s.MovePlayer(model.East)
 		case systems.InputAction_MovePlayer_West:
-			s.MovePlayer(model.West)
-			complete = true
+			complete = s.MovePlayer(model.West)
 		case systems.InputAction_MovePlayer_North:
-			s.MovePlayer(model.North)
-			complete = true
+			complete = s.MovePlayer(model.North)
 		case systems.InputAction_MovePlayer_South:
-			s.MovePlayer(model.South)
-			complete = true
+			complete = s.MovePlayer(model.South)
 		default:
 		}
 
 		return
 	})
 
-	s.someNPC = model.CreateEntity(
-		model.WithPosition(s.dungeon.CurrentLevel().Ground().NextLevelStaircase().Position),
-		model.WithName("NPC"),
-		model.WithPresentation('n', tcell.StyleDefault),
-		model.WithStats(model.RandomStats(21, 1, 20, []model.Stat{model.Stat_Attributes_Strength, model.Stat_Attributes_Constitution, model.Stat_Attributes_Intelligence, model.Stat_Attributes_Dexterity})),
-		model.WithHealthData(20, 20, false),
-	)
+	// s.someNPC = model.CreateEntity(
+	// 	model.WithPosition(s.dungeon.CurrentLevel().Ground().NextLevelStaircase().Position),
+	// 	model.WithName("NPC"),
+	// 	model.WithPresentation('n', tcell.StyleDefault),
+	// 	model.WithStats(model.RandomStats(21, 1, 20, []model.Stat{model.Stat_Attributes_Strength, model.Stat_Attributes_Constitution, model.Stat_Attributes_Intelligence, model.Stat_Attributes_Dexterity})),
+	// 	model.WithHealthData(20, 20, false),
+	// )
 
-	s.turnSystem.Schedule(20, func() (complete bool, requeue bool) {
-		s.CalcPathToPlayerAndMove()
+	// s.turnSystem.Schedule(20, func() (complete bool, requeue bool) {
+	// 	s.CalcPathToPlayerAndMove()
 
-		return true, true
-	})
+	// 	return true, true
+	// })
 
 	s.eventLog = engine.CreateGameEventLog(100)
 
@@ -109,7 +104,28 @@ func CreatePlayingState(turnSystem *systems.TurnSystem, inputSystem *systems.Inp
 	s.healthBar = ui.CreateHealthBar(68, 0, 12, 3, s.player, tcell.StyleDefault)
 
 	s.dungeon.CurrentLevel().AddEntity(s.player)
-	s.dungeon.CurrentLevel().AddEntity(s.someNPC)
+
+	entityTable := model.CreateEntityTable()
+
+	entityTable.Add(1, func(x, y int) model.Entity { return model.Entity_Imp(x, y) })
+
+	s.npcs = SpawnNPCs(s.dungeon, 7, entityTable)
+
+	for _, npc := range s.npcs {
+		speed := 10
+
+		if npc.Speed() != nil {
+			speed = npc.Speed().Speed
+		}
+
+		s.turnSystem.Schedule(speed, func() (complete bool, requeue bool) {
+			CalcPathToPlayerAndMove(25, s.eventLog, s.dungeon, npc, s.player)
+
+			return true, true
+		})
+	}
+
+	// s.dungeon.CurrentLevel().AddEntity(s.someNPC)
 
 	s.viewport = engine.CreateViewport(
 		engine.PositionAt(0, 0),
@@ -127,9 +143,29 @@ func (s *PlayingState) InputContext() systems.InputContext {
 	return systems.InputContext_Play
 }
 
-func (ps *PlayingState) MovePlayer(direction model.Direction) {
+func SpawnNPCs(dungeon *model.Dungeon, number int, genTable *model.EntityTable) []model.Entity {
+	rooms := dungeon.CurrentLevel().Ground().Rooms().Rooms
+
+	entities := make([]model.Entity, 0, number)
+
+	for range number {
+		r := rooms[rand.Intn(len(rooms))]
+
+		x, y := engine.RandInt(r.Position().X()+1, r.Position().X()+r.Size().Width()-1), engine.RandInt(r.Position().Y()+1, r.Position().Y()+r.Size().Height()-1)
+
+		entity := genTable.Generate(x, y)
+
+		entities = append(entities, entity)
+
+		dungeon.CurrentLevel().AddEntity(entity)
+	}
+
+	return entities
+}
+
+func (ps *PlayingState) MovePlayer(direction model.Direction) (success bool) {
 	if direction == model.DirectionNone {
-		return
+		return true
 	}
 
 	newPlayerPos := ps.player.Position().WithOffset(model.MovementDirectionOffset(direction))
@@ -140,12 +176,12 @@ func (ps *PlayingState) MovePlayer(direction model.Direction) {
 	if ent != nil && ent.HealthData() != nil {
 		if ent.HealthData().IsDead {
 			// TODO: If the entity is dead, the player should be able to move through it.
-			return
+			return false
 		}
 
 		ExecuteAttack(ps.eventLog, ps.player, ent)
 
-		return
+		return true
 	}
 
 	if ps.dungeon.CurrentLevel().IsTilePassable(newPlayerPos.XY()) {
@@ -153,6 +189,12 @@ func (ps *PlayingState) MovePlayer(direction model.Direction) {
 		ps.viewport.SetCenter(ps.player.Position())
 
 		ps.eventLog.Log("You moved " + model.DirectionName(direction))
+
+		return true
+	} else {
+		ps.eventLog.Log("You bump into an impassable object" + model.DirectionName(direction))
+
+		return false
 	}
 }
 
@@ -197,18 +239,22 @@ func CalculateAttack(attacker, victim model.Entity) (hit bool, precisionRoll, ev
 	}
 }
 
-func (ps *PlayingState) InteractBelowPlayer() {
+func (ps *PlayingState) InteractBelowPlayer() (success bool) {
 	playerPos := ps.player.Position()
 
 	if playerPos == ps.dungeon.CurrentLevel().Ground().NextLevelStaircase().Position {
 		ps.SwitchToNextLevel()
-		return
+		return true
 	}
 
 	if playerPos == ps.dungeon.CurrentLevel().Ground().PreviousLevelStaircase().Position {
 		ps.SwitchToPreviousLevel()
-		return
+		return true
 	}
+
+	ps.eventLog.Log("There is nothing to interact with here")
+
+	return false
 }
 
 func (ps *PlayingState) SwitchToNextLevel() {
@@ -283,34 +329,38 @@ func (ps *PlayingState) SwitchToPreviousLevel() {
 	ps.dungeon.CurrentLevel().AddEntity(ps.player)
 }
 
-func (ps *PlayingState) PickUpItemUnderPlayer() {
-	pos := ps.player.Position()
-	item := ps.dungeon.CurrentLevel().RemoveItemAt(pos.XY())
+func PickUpItemUnderPlayer(eventLog *engine.GameEventLog, dungeon *model.Dungeon, player *model.Player) (success bool) {
+	pos := player.Position()
+	item := dungeon.CurrentLevel().RemoveItemAt(pos.XY())
 
 	if item == nil {
-		return
+		eventLog.Log("There is no item to pick up here")
+		return false
 	}
 
-	success := ps.player.Inventory().Push(item)
+	success = player.Inventory().Push(item)
 
 	if !success {
-		ps.dungeon.CurrentLevel().SetItemAt(pos.X(), pos.Y(), item)
+		eventLog.Log("Unable to pick up item")
+		dungeon.CurrentLevel().SetItemAt(pos.X(), pos.Y(), item)
 		return
 	}
 
 	if item.Named() != nil {
 		itemName := item.Named().Name
-		ps.eventLog.Log("You picked up " + itemName)
+		eventLog.Log("You picked up " + itemName)
 	} else {
-		ps.eventLog.Log("You picked up an item")
+		eventLog.Log("You picked up an item")
 	}
+
+	return true
 }
 
-func (ps *PlayingState) HasLineOfSight(start, end engine.Position) bool {
+func HasLineOfSight(dungeon *model.Dungeon, start, end engine.Position) bool {
 	positions := engine.CastRay(start, end)
 
 	for _, p := range positions {
-		if ps.dungeon.CurrentLevel().IsGroundTileOpaque(p.XY()) {
+		if dungeon.CurrentLevel().IsGroundTileOpaque(p.XY()) {
 			return false
 		}
 	}
@@ -318,26 +368,30 @@ func (ps *PlayingState) HasLineOfSight(start, end engine.Position) bool {
 	return true
 }
 
-func (ps *PlayingState) PlayerWithinHitRange(pos engine.Position) bool {
-	return pos.WithOffset(-1, 0) == ps.player.Position() || pos.WithOffset(+1, 0) == ps.player.Position() || pos.WithOffset(0, -1) == ps.player.Position() || pos.WithOffset(0, +1) == ps.player.Position()
+func WithinHitRange(pos engine.Position, otherPos engine.Position) bool {
+	return pos.WithOffset(-1, 0) == otherPos || pos.WithOffset(+1, 0) == otherPos || pos.WithOffset(0, -1) == otherPos || pos.WithOffset(0, +1) == otherPos
 }
 
-func (ps *PlayingState) CalcPathToPlayerAndMove() {
-	if ps.someNPC.HealthData().IsDead {
-		ps.dungeon.CurrentLevel().DropEntity(ps.someNPC.UniqueId())
+func CalcPathToPlayerAndMove(simulationDistance int, eventLog *engine.GameEventLog, dungeon *model.Dungeon, npc model.Entity, player *model.Player) {
+	if npc.Positioned().Position.DistanceSquared(player.Position()) > simulationDistance*simulationDistance {
+		return
+	}
+
+	if npc.HealthData().IsDead {
+		dungeon.CurrentLevel().DropEntity(npc.UniqueId())
 		return
 	}
 
 	playerVisibleAndInRange := false
 
-	if ps.someNPC.Positioned().Position.Distance(ps.player.Position()) < 20 && ps.HasLineOfSight(ps.someNPC.Positioned().Position, ps.player.Position()) {
+	if npc.Positioned().Position.DistanceSquared(player.Position()) < 144 && HasLineOfSight(dungeon, npc.Positioned().Position, player.Position()) {
 		playerVisibleAndInRange = true
 	}
 
 	if !playerVisibleAndInRange {
 		randomMove := model.Direction(engine.RandInt(int(model.DirectionNone), int(model.East)))
 
-		nextPos := ps.someNPC.Positioned().Position
+		nextPos := npc.Positioned().Position
 
 		switch randomMove {
 		case model.North:
@@ -352,9 +406,9 @@ func (ps *PlayingState) CalcPathToPlayerAndMove() {
 			return
 		}
 
-		if ps.dungeon.CurrentLevel().IsTilePassable(nextPos.XY()) {
-			ps.dungeon.CurrentLevel().MoveEntityTo(
-				ps.someNPC.UniqueId(),
+		if dungeon.CurrentLevel().IsTilePassable(nextPos.XY()) {
+			dungeon.CurrentLevel().MoveEntityTo(
+				npc.UniqueId(),
 				nextPos.X(),
 				nextPos.Y(),
 			)
@@ -363,33 +417,38 @@ func (ps *PlayingState) CalcPathToPlayerAndMove() {
 		return
 	}
 
-	if ps.PlayerWithinHitRange(ps.someNPC.Positioned().Position) {
-		ExecuteAttack(ps.eventLog, ps.someNPC, ps.player)
+	if WithinHitRange(npc.Positioned().Position, player.Position()) {
+		ExecuteAttack(eventLog, npc, player)
 	}
 
 	pathToPlayer := engine.FindPath(
-		ps.someNPC.Positioned().Position,
-		ps.player.Position(),
+		npc.Positioned().Position,
+		player.Position(),
+		12,
 		func(x, y int) bool {
-			if x == ps.player.Position().X() && y == ps.player.Position().Y() {
+			if x == player.Position().X() && y == player.Position().Y() {
 				return true
 			}
 
-			return ps.dungeon.CurrentLevel().IsTilePassable(x, y)
+			return dungeon.CurrentLevel().IsTilePassable(x, y)
 		},
 	)
 
+	if pathToPlayer == nil {
+		return
+	}
+
 	nextPos, hasNext := pathToPlayer.Next()
 
 	if !hasNext {
 		return
 	}
 
-	if nextPos.Equals(ps.player.Position()) {
+	if nextPos.Equals(player.Position()) {
 		return
 	}
 
-	ps.dungeon.CurrentLevel().MoveEntityTo(ps.someNPC.UniqueId(), nextPos.X(), nextPos.Y())
+	dungeon.CurrentLevel().MoveEntityTo(npc.UniqueId(), nextPos.X(), nextPos.Y())
 }
 
 func (ps *PlayingState) OnTick(dt int64) (nextState GameState) {

game/ui/menu/menu_player_inventory_menu.go

@@ -26,7 +26,11 @@ type PlayerInventoryMenu struct {
 	playerItems    *engine.ArbitraryDrawable
 	selectedItem   *engine.ArbitraryDrawable
 
+	equipmentSlots *engine.ArbitraryDrawable
+
 	selectedInventorySlot engine.Position
+
+	highlightStyle tcell.Style
 }
 
 func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventory, style tcell.Style, highlightStyle tcell.Style) *PlayerInventoryMenu {
@@ -72,10 +76,12 @@ func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventor
 		x+2, y+5, 3, 1, 8, 4, '┌', '─', '┬', '┐', '│', ' ', '│', '│', '├', '─', '┼', '┤', '└', '─', '┴', '┘', style, highlightStyle,
 	)
 
+	menu.highlightStyle = highlightStyle
+
 	menu.playerItems = engine.CreateDrawingInstructions(func(v views.View) {
-		for y := range playerInventory.Shape().Height() {
-			for x := range playerInventory.Shape().Width() {
-				item := playerInventory.ItemAt(x, y)
+		for y := range menu.inventory.Shape().Height() {
+			for x := range menu.inventory.Shape().Width() {
+				item := menu.inventory.ItemAt(x, y)
 				isHighlighted := x == menu.selectedInventorySlot.X() && y == menu.selectedInventorySlot.Y()
 
 				if item == nil {
@@ -85,7 +91,7 @@ func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventor
 							menu.inventoryGrid.Position().X()+1+x*4,
 							menu.inventoryGrid.Position().Y()+1+y*2,
 							"   ",
-							highlightStyle,
+							menu.highlightStyle,
 						).Draw(v)
 					}
 
@@ -95,7 +101,7 @@ func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventor
 				style := item.Style()
 
 				if isHighlighted {
-					style = highlightStyle
+					style = menu.highlightStyle
 				}
 
 				menu.drawItemSlot(
@@ -110,7 +116,7 @@ func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventor
 	})
 
 	menu.selectedItem = engine.CreateDrawingInstructions(func(v views.View) {
-		item := playerInventory.ItemAt(menu.selectedInventorySlot.XY())
+		item := menu.inventory.ItemAt(menu.selectedInventorySlot.XY())
 
 		if item == nil {
 			return
@@ -119,9 +125,37 @@ func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventor
 		ui.CreateUIItem(x+2, y+14, item, style).Draw(v)
 	})
 
+	menu.equipmentSlots = engine.CreateDrawingInstructions(func(v views.View) {
+		drawEquipmentSlot(menu.rightHandBox.Position().X()+1, menu.rightHandBox.Position().Y(), menu.inventory.AtSlot(model.EquippedSlotDominantHand), false, menu.highlightStyle, v)
+		drawEquipmentSlot(menu.leftHandBox.Position().X()+1, menu.leftHandBox.Position().Y(), menu.inventory.AtSlot(model.EquippedSlotOffhand), false, menu.highlightStyle, v)
+		drawEquipmentSlot(x+10+1, y+3, menu.inventory.AtSlot(model.EquippedSlotHead), false, menu.highlightStyle, v)
+		drawEquipmentSlot(x+10+4, y+3, menu.inventory.AtSlot(model.EquippedSlotChestplate), false, menu.highlightStyle, v)
+		drawEquipmentSlot(x+10+7, y+3, menu.inventory.AtSlot(model.EquippedSlotLeggings), false, menu.highlightStyle, v)
+		drawEquipmentSlot(x+10+10, y+3, menu.inventory.AtSlot(model.EquippedSlotShoes), false, menu.highlightStyle, v)
+	})
+
 	return menu
 }
 
+func drawEquipmentSlot(screenX, screenY int, item model.Item, highlighted bool, highlightStyle tcell.Style, v views.View) {
+	if item == nil {
+		return
+	}
+
+	style := item.Style()
+
+	if highlighted {
+		style = highlightStyle
+	}
+
+	ui.CreateSingleLineUILabel(
+		screenX,
+		screenY+1,
+		item.Icon(),
+		style,
+	).Draw(v)
+}
+
 func (pim *PlayerInventoryMenu) drawItemSlot(screenX, screenY int, item model.Item, style tcell.Style, v views.View) {
 	if item.Quantifiable() != nil {
 		ui.CreateSingleLineUILabel(
@@ -181,4 +215,5 @@ func (pim *PlayerInventoryMenu) Draw(v views.View) {
 	pim.inventoryGrid.Draw(v)
 	pim.playerItems.Draw(v)
 	pim.selectedItem.Draw(v)
+	pim.equipmentSlots.Draw(v)
 }

main.go

@@ -1,6 +1,8 @@
 package main
 
-import "mvvasilev/last_light/game"
+import (
+	"mvvasilev/last_light/game"
+)
 
 func main() {
 	gc := game.CreateGameContext()