Simulated arrows. Why...

engine/engine_path.go

@@ -38,3 +38,20 @@ func (p *Path) Next() (current Position, hasNext bool) {
 
 	return p.CurrentPosition(), true
 }
+
+func LinePath(from, to Position) *Path {
+	points := make([]Position, 0)
+	n := float64(from.Distance(to))
+
+	for step := 0.0; step <= n; step += 1.0 {
+		t := 0.0
+
+		if n != 0 {
+			t = step / n
+		}
+
+		points = append(points, LerpPositions(from, to, t))
+	}
+
+	return CreatePath(from, to, points)
+}

engine/engine_pathfinding.go

@@ -35,7 +35,7 @@ func FindPath(from Position, to Position, maxDistance int, isPassable func(x, y
 		iteration++
 
 		if iteration >= maxDistance {
-			return nil
+			break
 		}
 
 		if len(openList) == 0 {

engine/engine_util.go

@@ -173,3 +173,14 @@ func AbsInt(val int) int {
 	}
 	return val
 }
+
+func Lerp(start, end float64, t float64) float64 {
+	return start*(1.0-t) + end*t
+}
+
+func LerpPositions(p0, p1 Position, t float64) Position {
+	return PositionAt(
+		int(math.Round(Lerp(float64(p0.x), float64(p1.x), t))),
+		int(math.Round(Lerp(float64(p0.y), float64(p1.y), t))),
+	)
+}

game/model/entity.go

@@ -87,6 +87,11 @@ type Entity_DropTableComponent struct {
 	DropTable *LootTable
 }
 
+type Entity_ProjectileComponent struct {
+	Source Entity
+	Path   *engine.Path
+}
+
 type Entity interface {
 	UniqueId() uuid.UUID
 
@@ -99,6 +104,7 @@ type Entity interface {
 	Stats() *Entity_StatsHolderComponent
 	HealthData() *Entity_HealthComponent
 	DropTable() *Entity_DropTableComponent
+	Projectile() *Entity_ProjectileComponent
 }
 
 type BaseEntity struct {
@@ -113,6 +119,7 @@ type BaseEntity struct {
 	stats       *Entity_StatsHolderComponent
 	damageable  *Entity_HealthComponent
 	dropTable   *Entity_DropTableComponent
+	projectile  *Entity_ProjectileComponent
 }
 
 func (be *BaseEntity) UniqueId() uuid.UUID {
@@ -155,6 +162,10 @@ func (be *BaseEntity) DropTable() *Entity_DropTableComponent {
 	return be.dropTable
 }
 
+func (be *BaseEntity) Projectile() *Entity_ProjectileComponent {
+	return be.projectile
+}
+
 func CreateEntity(components ...func(*BaseEntity)) *BaseEntity {
 	e := &BaseEntity{
 		id: uuid.New(),
@@ -250,3 +261,12 @@ func WithDropTable(table map[int]ItemSupplier) func(e *BaseEntity) {
 		}
 	}
 }
+
+func WithProjectileData(source Entity, path *engine.Path) func(e *BaseEntity) {
+	return func(e *BaseEntity) {
+		e.projectile = &Entity_ProjectileComponent{
+			Source: source,
+			Path:   path,
+		}
+	}
+}

game/model/entity_behavior.go

@@ -5,11 +5,86 @@ import (
 	"mvvasilev/last_light/engine"
 )
 
-// func ProjectileBehavior() func(npc Entity) (complete bool, requeue bool) {
-// 	return func(npc Entity) (complete bool, requeue bool) {
+type ProjectileSprite rune
 
-// 	}
-// }
+//
+// \  |  /
+//
+// ─  +  ─
+//
+// /  |  \
+
+const (
+	ProjectileSprite_NorthSouth         ProjectileSprite = '|'
+	ProjectileSprite_EastWest                            = '─'
+	ProjectileSprite_NorthEastSouthWest                  = '/'
+	ProjectileSprite_NorthWestSouthEast                  = '\\'
+)
+
+func ProjectileBehavior(eventLog *engine.GameEventLog, dungeon *Dungeon) func(npc Entity) (complete bool, requeue bool) {
+	return func(npc Entity) (complete bool, requeue bool) {
+		hasNext := ProjectileFollowPathNext(npc, eventLog, dungeon)
+
+		return !hasNext, false
+	}
+}
+
+func ProjectileFollowPathNext(npc Entity, eventLog *engine.GameEventLog, dungeon *Dungeon) (hasNext bool) {
+	projectileData := npc.Projectile()
+	positionData := npc.Positioned()
+
+	if projectileData == nil || positionData == nil {
+		return false
+	}
+
+	path := projectileData.Path
+	next, hasNext := path.Next()
+
+	nextTile := dungeon.CurrentLevel().TileAt(next.XY())
+
+	nextTileEntityData := nextTile.Entity()
+
+	dungeon.CurrentLevel().DropEntity(npc.UniqueId())
+
+	positionData.Position = next
+
+	// The next tile is impassable ( wall, void, etc. ) and contains no entity to damage
+	// This is the end of the path
+	if nextTileEntityData == nil && !nextTile.Passable() {
+		return false
+	}
+
+	// Otherwise, if the tile is passible, but also the end of the path, stop here and despawn the projectile
+	if nextTileEntityData == nil && next == projectileData.Path.To() {
+		return false
+	}
+
+	// The next tile contains an entity, do damage to it if we have damage data
+	if nextTileEntityData != nil {
+
+		// The arrow strikes against its master, but to no avail, for I decree it to be illegal
+		if nextTileEntityData.Entity == projectileData.Source {
+			return
+		}
+
+		// Futher I decree, that should the arrow striketh at thyself, it shall be blocked from doing so
+		if nextTileEntityData.Entity == npc {
+			return
+		}
+
+		if projectileData.Source == nil {
+			return false
+		}
+
+		ExecuteAttack(eventLog, projectileData.Source, nextTileEntityData.Entity)
+
+		return false
+	}
+
+	dungeon.CurrentLevel().AddEntity(npc)
+
+	return
+}
 
 func HostileNPCBehavior(eventLog *engine.GameEventLog, dungeon *Dungeon, player *Player) func(npc Entity) (complete bool, requeue bool) {
 	return func(npc Entity) (complete bool, requeue bool) {
@@ -121,6 +196,10 @@ func WithinHitRange(pos engine.Position, otherPos engine.Position) bool {
 func ExecuteAttack(eventLog *engine.GameEventLog, attacker, victim Entity) {
 	hit, precision, evasion, dmg, dmgType := CalculateAttack(attacker, victim)
 
+	if attacker.Projectile() != nil {
+		attacker = attacker.Projectile().Source
+	}
+
 	attackerName := "Unknown"
 
 	if attacker.Named() != nil {
@@ -138,6 +217,10 @@ func ExecuteAttack(eventLog *engine.GameEventLog, attacker, victim Entity) {
 		return
 	}
 
+	if victim.HealthData() == nil {
+		return
+	}
+
 	victim.HealthData().Health -= dmg
 
 	if victim.HealthData().Health <= 0 {

game/model/entity_npcs.go

@@ -12,10 +12,13 @@ const (
 	ImpClaws specialItemType = 100_000 + iota
 )
 
-func Entity_ArrowProjectile(startX, startY int, targetX, targetY int) Entity {
+func Entity_ArrowProjectile(source Entity, path *engine.Path, eventLog *engine.GameEventLog, dungeon *Dungeon) Entity {
 	return CreateEntity(
 		WithName("Arrow"),
-		WithPosition(engine.PositionAt(startX, startY)),
+		WithPosition(path.From()),
+		WithPresentation('?', tcell.StyleDefault),
+		WithProjectileData(source, path),
+		WithBehavior(1, ProjectileBehavior(eventLog, dungeon)),
 	)
 }
 

game/model/entity_player.go

@@ -9,6 +9,7 @@ import (
 type Player struct {
 	Entity
 
+	inLookState  bool
 	skipNextTurn bool
 }
 
@@ -64,3 +65,11 @@ func (p *Player) SkipNextTurn(skip bool) {
 func (p *Player) IsNextTurnSkipped() bool {
 	return p.skipNextTurn
 }
+
+func (p *Player) IsInLookState() bool {
+	return p.inLookState
+}
+
+func (p *Player) SetInLookState(lookState bool) {
+	p.inLookState = lookState
+}

game/model/world_dungeon.go

@@ -90,7 +90,7 @@ func (d *Dungeon) HasNextLevel() bool {
 
 type DungeonLevel struct {
 	ground             Map
-	entitiesByPosition map[engine.Position][]Entity
+	entitiesByPosition map[engine.Position]Entity
 	entities           map[uuid.UUID]Entity
 }
 
@@ -142,7 +142,7 @@ func CreateDungeonLevel(width, height int, dungeonType DungeonType) (dLevel *Dun
 	dLevel = &DungeonLevel{
 		ground:             groundLevel,
 		entities:           map[uuid.UUID]Entity{},
-		entitiesByPosition: map[engine.Position][]Entity{},
+		entitiesByPosition: map[engine.Position]Entity{},
 	}
 
 	if groundLevel.Rooms() == nil {
@@ -238,11 +238,7 @@ func (d *DungeonLevel) AddEntity(entity Entity) {
 	d.entities[entity.UniqueId()] = entity
 
 	if entity.Positioned() != nil {
-		if d.entitiesByPosition[entity.Positioned().Position] == nil {
-			d.entitiesByPosition[entity.Positioned().Position] = []Entity{entity}
-		} else {
-			d.entitiesByPosition[entity.Positioned().Position] = append(d.entitiesByPosition[entity.Positioned().Position], entity)
-		}
+		d.entitiesByPosition[entity.Positioned().Position] = entity
 	}
 }
 
@@ -258,9 +254,7 @@ func (d *DungeonLevel) MoveEntityTo(uuid uuid.UUID, x, y int) {
 	ent.Positioned().Position = engine.PositionAt(x, y)
 
 	if d.entitiesByPosition[ent.Positioned().Position] == nil {
-		d.entitiesByPosition[ent.Positioned().Position] = []Entity{ent}
-	} else {
-		d.entitiesByPosition[ent.Positioned().Position] = append(d.entitiesByPosition[ent.Positioned().Position], ent)
+		d.entitiesByPosition[ent.Positioned().Position] = ent
 	}
 }
 
@@ -303,7 +297,7 @@ func (d *DungeonLevel) TileAt(x, y int) Tile {
 	tile := Map_TileAt(d.ground, x, y)
 
 	if entity != nil {
-		return CreateTileFromPrototype(tile, Tile_WithEntities(entity))
+		return CreateTileFromPrototype(tile, Tile_WithEntity(entity))
 	}
 
 	return tile
@@ -316,14 +310,14 @@ func (d *DungeonLevel) IsTilePassable(x, y int) bool {
 
 	tile := d.TileAt(x, y)
 
-	if tile.Entities() != nil {
+	if tile.Entity() != nil {
 		return false
 	}
 
 	return tile.Passable()
 }
 
-func (d *DungeonLevel) EntitiesAt(x, y int) (e []Entity) {
+func (d *DungeonLevel) EntityAt(x, y int) (e Entity) {
 	return d.entitiesByPosition[engine.PositionAt(x, y)]
 }
 

game/model/world_tile.go

@@ -1,10 +1,7 @@
 package model
 
 import (
-	"slices"
-
 	"github.com/gdamore/tcell/v2"
-	"github.com/google/uuid"
 )
 
 type Material uint
@@ -26,7 +23,7 @@ type Tile_ItemComponent struct {
 }
 
 type Tile_EntityComponent struct {
-	Entities []Entity
+	Entity Entity
 }
 
 type Tile interface {
@@ -40,9 +37,9 @@ type Tile interface {
 	RemoveItem()
 	WithItem(item Item)
 
-	Entities() *Tile_EntityComponent
-	RemoveEntity(uuid uuid.UUID)
-	AddEntity(entity Entity)
+	Entity() *Tile_EntityComponent
+	RemoveEntity()
+	WithEntity(entity Entity)
 }
 
 type BaseTile struct {
@@ -52,8 +49,8 @@ type BaseTile struct {
 	material                      Material
 	passable, opaque, transparent bool
 
-	item     *Tile_ItemComponent
-	entities *Tile_EntityComponent
+	item   *Tile_ItemComponent
+	entity *Tile_EntityComponent
 }
 
 func CreateTileFromPrototype(prototype Tile, components ...func(*BaseTile)) Tile {
@@ -121,46 +118,24 @@ func (t *BaseTile) WithItem(item Item) {
 	}
 }
 
-func (t *BaseTile) Entities() *Tile_EntityComponent {
-	return t.entities
+func (t *BaseTile) Entity() *Tile_EntityComponent {
+	return t.entity
 }
 
-func (t *BaseTile) RemoveEntity(uuid uuid.UUID) {
-	if t.entities == nil {
-		return
+func (t *BaseTile) WithEntity(entity Entity) {
+	t.entity = &Tile_EntityComponent{
+		Entity: entity,
 	}
-
-	t.entities.Entities = slices.DeleteFunc(t.entities.Entities, func(e Entity) bool { return e.UniqueId() == uuid })
 }
 
-func (t *BaseTile) AddEntity(entity Entity) {
-	if t.entities == nil {
-		t.entities = &Tile_EntityComponent{
-			Entities: []Entity{
-				entity,
-			},
-		}
-
-		return
-	}
-
-	t.entities.Entities = append(t.entities.Entities, entity)
+func (t *BaseTile) RemoveEntity() {
+	t.entity = nil
 }
 
 func Tile_WithEntity(entity Entity) func(*BaseTile) {
 	return func(bt *BaseTile) {
-		bt.entities = &Tile_EntityComponent{
-			Entities: []Entity{
-				entity,
-			},
-		}
-	}
-}
-
-func Tile_WithEntities(entities []Entity) func(*BaseTile) {
-	return func(bt *BaseTile) {
-		bt.entities = &Tile_EntityComponent{
-			Entities: entities,
+		bt.entity = &Tile_EntityComponent{
+			Entity: entity,
 		}
 	}
 }

game/state/look_state.go

@@ -5,6 +5,7 @@ import (
 	"mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
 	"mvvasilev/last_light/game/systems"
+	"mvvasilev/last_light/game/ui"
 	"time"
 
 	"github.com/gdamore/tcell/v2"
@@ -23,9 +24,14 @@ type LookState struct {
 	player      *model.Player
 	dungeon     *model.Dungeon
 
+	showLog    bool
+	uiEventLog *ui.UIEventLog
+
 	showCursor          bool
 	cursorPos           engine.Position
 	lastCursorBlinkTime time.Time
+
+	nextGameState GameState
 }
 
 func CreateLookState(prevState GameState, eventLog *engine.GameEventLog, dungeon *model.Dungeon, inputSystem *systems.InputSystem, turnSystem *systems.TurnSystem, player *model.Player) *LookState {
@@ -38,6 +44,8 @@ func CreateLookState(prevState GameState, eventLog *engine.GameEventLog, dungeon
 		eventLog:            eventLog,
 		cursorPos:           engine.PositionAt(0, 0),
 		lastCursorBlinkTime: time.Now(),
+		showLog:             true,
+		uiEventLog:          ui.CreateUIEventLog(0, 17, 80, 7, eventLog, tcell.StyleDefault),
 	}
 }
 
@@ -46,6 +54,8 @@ func (ls *LookState) InputContext() systems.InputContext {
 }
 
 func (ls *LookState) OnTick(dt int64) GameState {
+	ls.nextGameState = ls
+
 	switch ls.inputSystem.NextAction() {
 	case systems.InputAction_Move_North:
 		ls.cursorPos = ls.cursorPos.WithOffset(model.MovementDirectionOffset(model.North))
@@ -55,15 +65,17 @@ func (ls *LookState) OnTick(dt int64) GameState {
 		ls.cursorPos = ls.cursorPos.WithOffset(model.MovementDirectionOffset(model.East))
 	case systems.InputAction_Move_West:
 		ls.cursorPos = ls.cursorPos.WithOffset(model.MovementDirectionOffset(model.West))
+	case systems.InputAction_OpenLogs:
+		ls.showLog = !ls.showLog
 	case systems.InputAction_Describe:
 		ls.Describe()
 	case systems.InputAction_Shoot:
 		ls.ShootEquippedWeapon()
 	case systems.InputAction_Menu_Exit:
-		return ls.prevState
+		ls.nextGameState = ls.prevState
 	}
 
-	return ls
+	return ls.nextGameState
 }
 
 func (ls *LookState) ShootEquippedWeapon() {
@@ -90,15 +102,49 @@ func (ls *LookState) ShootEquippedWeapon() {
 	}
 
 	// TODO: Projectiles
+	dX, dY := ls.lookCursorCoordsToDungeonCoords()
+
+	distance := engine.PositionAt(dX, dY).Distance(ls.player.Position())
+
+	if distance >= 12 {
+		ls.eventLog.Log("Can't see in the dark that far")
+
+		return
+	}
+
+	path := engine.LinePath(
+		ls.player.Position(),
+		engine.PositionAt(dX, dY),
+	)
+
+	if path == nil {
+		ls.eventLog.Log("Can't shoot there, something is in the way")
+		return
+	}
+
+	projectile := model.Entity_ArrowProjectile(ls.player, path, ls.eventLog, ls.dungeon)
+
+	ls.turnSystem.Schedule(
+		projectile.Behavior().Speed,
+		projectile.Behavior().Behavior,
+	)
 
 	ls.player.SkipNextTurn(true)
 
-	ls.turnSystem.NextTurn()
+	ls.nextGameState = ls.prevState
 }
 
 func (ls *LookState) Describe() {
 	dX, dY := ls.lookCursorCoordsToDungeonCoords()
 
+	distance := engine.PositionAt(dX, dY).Distance(ls.player.Position())
+
+	if distance >= 12 {
+		ls.eventLog.Log("Can't see in the dark that far")
+
+		return
+	}
+
 	isVisibleFromPlayer, lastTile := model.HasLineOfSight(ls.dungeon, ls.player.Position(), engine.PositionAt(dX, dY))
 
 	if !isVisibleFromPlayer {
@@ -110,10 +156,10 @@ func (ls *LookState) Describe() {
 
 	tile := ls.dungeon.CurrentLevel().TileAt(dX, dY)
 
-	entities := tile.Entities()
+	entity := tile.Entity()
 
-	if entities != nil {
-		ls.DescribeEntities(entities.Entities)
+	if entity != nil {
+		ls.DescribeEntity(entity.Entity)
 
 		return
 	}
@@ -131,27 +177,25 @@ func (ls *LookState) Describe() {
 	ls.eventLog.Log(fmt.Sprintf("%s: %s", materialName, materialDesc))
 }
 
-func (ls *LookState) DescribeEntities(entities []model.Entity) {
-	if entities == nil {
+func (ls *LookState) DescribeEntity(entity model.Entity) {
+	if entity == nil {
 		return
 	}
 
-	for _, entity := range entities {
-		if entity == ls.player {
-			ls.eventLog.Log("You")
+	if entity == ls.player {
+		ls.eventLog.Log("You")
 
-			continue
-		}
+		return
+	}
 
-		if entity.Named() == nil {
-			continue
-		}
+	if entity.Named() == nil {
+		return
+	}
 
-		if entity.Described() != nil {
-			ls.eventLog.Log(fmt.Sprintf("%s: %s", entity.Named().Name, entity.Described().Description))
-		} else {
-			ls.eventLog.Log(entity.Named().Name)
-		}
+	if entity.Described() != nil {
+		ls.eventLog.Log(fmt.Sprintf("%s: %s", entity.Named().Name, entity.Described().Description))
+	} else {
+		ls.eventLog.Log(entity.Named().Name)
 	}
 }
 
@@ -209,5 +253,9 @@ func (ls *LookState) CollectDrawables() []engine.Drawable {
 		}
 	}))
 
+	if ls.showLog {
+		drawables = append(drawables, ls.uiEventLog)
+	}
+
 	return drawables
 }

game/state/playing_state.go

@@ -64,7 +64,7 @@ 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_EnterLookMode:
-			s.viewShortLogs = !s.viewShortLogs
+			s.viewShortLogs = false
 			s.nextGameState = CreateLookState(s, s.eventLog, s.dungeon, s.inputSystem, s.turnSystem, s.player)
 		case systems.InputAction_PickUpItem:
 			complete = PickUpItemUnderPlayer(s.eventLog, s.dungeon, s.player)
@@ -162,7 +162,7 @@ func (ps *PlayingState) MovePlayer(direction model.Direction) (success bool) {
 
 	newPlayerPos := ps.player.Position().WithOffset(model.MovementDirectionOffset(direction))
 
-	ent := ps.dungeon.CurrentLevel().EntitiesAt(newPlayerPos.XY())[0]
+	ent := ps.dungeon.CurrentLevel().EntityAt(newPlayerPos.XY())
 
 	// We are moving into an entity with health data. Attack it.
 	if ent != nil && ent.HealthData() != nil {
@@ -334,8 +334,8 @@ func (ps *PlayingState) CollectDrawables() []engine.Drawable {
 
 			if tile != nil {
 
-				if tile.Entities() != nil {
-					return tile.Entities().Entities[0].Presentable().Rune, tile.Entities().Entities[0].Presentable().Style
+				if tile.Entity() != nil {
+					return tile.Entity().Entity.Presentable().Rune, tile.Entity().Entity.Presentable().Style
 				}
 
 				if tile.Item() != nil {

game/systems/input_system.go

@@ -93,6 +93,7 @@ func CreateInputSystemWithDefaultBindings() *InputSystem {
 			InputKeyOf(InputContext_Look, 0, tcell.KeyRight, 0):       InputAction_Move_East,
 			InputKeyOf(InputContext_Look, 0, tcell.KeyRune, 'd'):      InputAction_Describe,
 			InputKeyOf(InputContext_Look, 0, tcell.KeyRune, 'a'):      InputAction_Shoot,
+			InputKeyOf(InputContext_Look, 0, tcell.KeyRune, 'l'):      InputAction_OpenLogs,
 			InputKeyOf(InputContext_Look, 0, tcell.KeyESC, 0):         InputAction_Menu_Exit,
 		},
 	}