Now the pathing is incorporated into the project before doing combat and final touches.

03_pathing_enemies/data.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+  "github.com/gdamore/tcell/v2"
+)
+
+const (
+  WALL = '#'
+  SPACE = '.'
+  PATH_LIMIT = 1000
+  RENDER = true
+  SHOW_RENDER = false
+  SHOW_PATHS = false
+  HEARING_DISTANCE = 6
+)
+
+type Map [][]rune
+type Paths [][]int
+
+type Position struct {
+  X int
+  Y int
+}
+
+type Enemy struct {
+  HP int
+  Pos Position
+  Damage int
+}
+
+type Game struct {
+  Screen tcell.Screen
+  Level Map
+  Paths Paths
+  Player Enemy
+  Status string
+  Width int
+  Height int
+  Enemies map[Position]*Enemy
+}

03_pathing_enemies/debug.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+  "log"
+  "os"
+  "fmt"
+  "github.com/gdamore/tcell/v2"
+)
+
+var dbg *log.Logger
+
+func DebugInit() {
+  out, err := os.Create("debug.log")
+  if err != nil { log.Fatal(err) }
+  dbg = log.New(out, "", log.LstdFlags)
+}
+
+func (game *Game) DrawPaths() {
+  for y, row := range game.Paths {
+    for x, path_num := range row {
+      if path_num == PATH_LIMIT { continue }
+
+      as_str := fmt.Sprintf("%x", path_num % 16)
+      style := tcell.StyleDefault.Foreground(tcell.ColorGray)
+
+      if path_num >= 0 && path_num <= 16 {
+        style = style.Reverse(true)
+      }
+
+      game.Screen.SetContent(x, y, rune(as_str[0]), nil, style)
+    }
+  }
+}

03_pathing_enemies/game.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+  "os"
+  "math/rand"
+)
+
+func NewGame(width int, height int) (*Game) {
+  var game Game
+
+  game.Width = width
+  game.Height = height
+  game.Enemies = make(map[Position]*Enemy)
+
+  game.Level = make(Map, height, height)
+  game.Paths = make(Paths, height, height)
+
+  game.Player = Enemy{20, Position{1,1}, 4}
+
+  return &game
+}
+
+func (game *Game) Exit() {
+  if RENDER {
+    game.Screen.Fini()
+  }
+
+  os.Exit(0)
+}
+
+func (game *Game) PlaceEnemies(places []Position) {
+  for _, pos := range places {
+    if rand.Int() % 2 == 0 {
+      game.Enemies[pos] = &Enemy{10, pos, 4}
+    }
+  }
+}
+
+func (game *Game) Restart() {
+  game.SetStatus("YOU DIED! Try again.")
+  game.Player.HP = 20
+  game.Player.Pos = Position{1,1}
+  clear(game.Enemies)
+  game.FillPaths(game.Paths, PATH_LIMIT)
+  game.FillMap(game.Level, '#')
+
+  game.Render()
+}

03_pathing_enemies/main.go

@@ -1,518 +1,27 @@
-
 package main
 
-import (
-  "os"
-  "slices"
-  "log"
-  "fmt"
-  "math/rand"
-  "time"
-  "github.com/gdamore/tcell/v2"
-  "github.com/gdamore/tcell/v2/encoding"
-)
-
-var dbg *log.Logger
-
-const (
-  WALL = '#'
-  SPACE = '.'
-  PATH_LIMIT = 1000
-  RENDER = true
-  SHOW_RENDER = false
-  SHOW_PATHS = true
-  HEARING_DISTANCE = 6
-)
-
-type Map [][]rune
-type Paths [][]int
-
-type Position struct {
-  x int
-  y int
-}
-
-type Enemy struct {
-  hp int
-  pos Position
-  damage int
-}
-
-type Game struct {
-  screen tcell.Screen
-  level Map
-  paths Paths
-  player Enemy
-  status string
-  width int
-  height int
-  enemies map[Position]*Enemy
-}
-
-func (game *Game) DrawText(x int, y int, text string) {
-  for i, cell := range text {
-    game.screen.SetContent(x+i, y, cell, nil, tcell.StyleDefault)
-  }
-}
-
-func (game *Game) DrawStatus() {
-  game.DrawText(0, game.height, game.status)
-
-  hp := fmt.Sprintf("HP: %d", game.player.hp)
-
-  game.DrawText(game.width - len(hp), game.height, hp)
-}
-
-func (game *Game) Status(msg string) {
-  game.status = msg
-}
-
-func (game *Game) DrawEntity(symbol rune, pos Position, color tcell.Color) {
-  style := tcell.StyleDefault.Bold(true).Foreground(color)
-  game.screen.SetContent(pos.x, pos.y, symbol, nil, style)
-}
-
-func (game *Game) DrawMap() {
-  gray := tcell.StyleDefault.Foreground(tcell.ColorGray)
-
-  for y, line := range game.level {
-    for x, cell := range line {
-      if cell == SPACE {
-        game.screen.SetContent(x, y, cell, nil, gray)
-      } else {
-        game.screen.SetContent(x, y, cell, nil, tcell.StyleDefault)
-      }
-    }
-  }
-}
-
-func (game *Game) DrawPaths() {
-  for y, row := range game.paths {
-    for x, path_num := range row {
-      if path_num == PATH_LIMIT { continue }
-
-      as_str := fmt.Sprintf("%x", path_num % 16)
-      style := tcell.StyleDefault.Foreground(tcell.ColorGray)
-
-      if path_num >= 0 && path_num <= 16 {
-        style = style.Reverse(true)
-      }
-
-      game.screen.SetContent(x, y, rune(as_str[0]), nil, style)
-    }
-  }
-}
-
-func (game *Game) Render() {
-  if !RENDER { return }
-
-  game.screen.Clear()
-
-  game.DrawMap()
-
-  if SHOW_PATHS {
-    game.DrawPaths()
-  }
-
-  game.DrawEntity('@', game.player.pos, tcell.ColorYellow)
-
-  for pos, _ := range game.enemies {
-    game.DrawEntity('G', pos, tcell.ColorRed)
-  }
-
-  game.DrawStatus()
-
-  game.screen.Show()
-}
-
-func (game *Game) Exit() {
-  if RENDER {
-    game.screen.Fini()
-  }
-
-  os.Exit(0)
-}
-
-func (game *Game) Occupied(x int, y int) bool {
-  pos := Position{x, y}
-  _, is_enemy := game.enemies[pos]
-  is_player := pos == game.player.pos
-
-  // Inbounds comes first to prevent accessing level with bad x,y
-  return !game.Inbounds(pos, 1) ||
-      game.level[y][x] == WALL ||
-      is_enemy ||
-      is_player
-}
-
-func (game *Game) EnemyDeath() {
-  is_dead := make([]Position, 0, len(game.enemies))
-
-  for pos, enemy := range game.enemies {
-    if enemy.hp < 0 {
-      is_dead = append(is_dead, pos)
-    }
-  }
-
-  for _, pos := range is_dead {
-    delete(game.enemies, pos)
-  }
-}
-
-func (game *Game) MovePlayer(x_delta int, y_delta int) {
-  target := Position{
-    game.player.pos.x + x_delta,
-    game.player.pos.y + y_delta,
-  }
-
-  if !game.Occupied(target.x, target.y) {
-    game.player.pos = target
-  }
-}
-
-func (game *Game) HandleKeys(ev *tcell.EventKey) bool {
-  switch ev.Key() {
-  case tcell.KeyEscape:
-    return false
-  case tcell.KeyUp:
-    game.MovePlayer(0, -1)
-  case tcell.KeyDown:
-    game.MovePlayer(0, 1)
-  case tcell.KeyRight:
-    game.MovePlayer(1, 0)
-  case tcell.KeyLeft:
-    game.MovePlayer(-1, 0)
-  }
-
-  switch ev.Rune() {
-  case 'q':
-    return false
-  }
-
-  return true
-}
-
-func (game *Game) HandleEvents() bool {
-  if !RENDER { return false }
-
-  switch ev := game.screen.PollEvent().(type) {
-  case *tcell.EventResize:
-    game.screen.Sync()
-  case *tcell.EventKey:
-    return game.HandleKeys(ev)
-  }
-
-  return true
-}
-
-func (game *Game) InitScreen() {
-  encoding.Register()
-
-  var err error
-  game.screen, err = tcell.NewScreen()
-  if err != nil { log.Fatal(err) }
-
-  err = game.screen.Init()
-  if err != nil { log.Fatal(err) }
-}
-
-func NewGame(width int, height int) (*Game) {
-  var game Game
-
-  game.width = width
-  game.height = height
-  game.enemies = make(map[Position]*Enemy)
-
-  game.level = make(Map, height, height)
-  game.paths = make(Paths, height, height)
-
-  game.player = Enemy{20, Position{1,1}, 4}
-
-  return &game
-}
-
-func compass(x int, y int, offset int) []Position {
-  return []Position{
-    Position{x, y - offset},
-    Position{x, y + offset},
-    Position{x + offset, y},
-    Position{ x - offset, y},
-  }
-}
-
-func (game *Game) Inbounds(pos Position, offset int) bool {
-  return pos.x >= offset &&
-    pos.x < game.width - offset &&
-    pos.y >= offset &&
-    pos.y < game.height - offset
-}
-
-func (game *Game) Neighbors(near Position) []Position {
-  result := make([]Position, 0, 4)
-  points := compass(near.x, near.y, 2)
-
-  for _, pos := range points {
-    if game.Inbounds(pos, 0) {
-      result = append(result, pos)
-    }
-  }
-
-  return result
-}
-
-func (game *Game) NeighborWalls(pos Position) []Position {
-  neighbors := game.Neighbors(pos)
-  result := make([]Position, 0)
-
-  for _, at := range neighbors {
-    cell := game.level[at.y][at.x]
-
-    if cell == WALL {
-      result = append(result, at)
-    }
-  }
-
-  return result
-}
-
-func (game *Game) FindCoord(on *Position, found *Position) bool {
-  for y := 1; y < game.height ; y += 2 {
-    for x := 1; x < game.width ; x += 2 {
-      if game.level[y][x] != WALL {
-        continue
-      }
-
-      neighbors := game.Neighbors(Position{x, y})
-
-      for _, pos := range neighbors {
-        if game.level[pos.y][pos.x] == SPACE {
-          *on = Position{x, y}
-          *found = pos
-          return true
-        }
-      }
-    }
-  }
-
-  return false
-}
-
-func (game *Game) HAKStep(from Position, to Position) {
-  game.level[from.y][from.x] = SPACE
-  row := (from.y + to.y) / 2
-  col := (from.x + to.x) / 2
-  game.level[row][col] = SPACE
-}
-
-func (game *Game) HuntAndKill() []Position {
-  on := Position{1, 1}
-  found := Position{1,1}
-
-  dead_ends := make([]Position, 0)
-
-  for {
-    neighbors := game.NeighborWalls(on)
-
-    if len(neighbors) == 0 {
-      dead_ends = append(dead_ends, on)
-
-      if !game.FindCoord(&on, &found) {
-        break
-      }
-
-      game.HAKStep(on, found)
-    } else {
-      rand_neighbor := rand.Int() % len(neighbors)
-      nb := neighbors[rand_neighbor]
-      game.HAKStep(nb, on)
-      on = nb
-    }
-
-    if SHOW_RENDER {
-      game.Render()
-      time.Sleep(50 * time.Millisecond)
-    }
-  }
-
-  return dead_ends
-}
-
-func (game *Game) FillMap(target Map, setting rune) {
-  for y := 0 ; y < game.height; y++ {
-    target[y] = slices.Repeat([]rune{setting}, game.width)
-  }
-}
-
-func (game *Game) FillPaths(target Paths, setting int) {
-  for y := 0 ; y < game.height; y++ {
-    target[y] = slices.Repeat([]int{setting}, game.width)
-  }
-}
-
-func (game *Game) CarveRoom(pos Position, size int) {
-  // only use ones far enough inside
-  for y := pos.y - size; y < pos.y + size; y++ {
-    for x := pos.x - size; x < pos.x + size; x++ {
-      if game.Inbounds(Position{x, y}, 1) {
-        game.level[y][x] = SPACE
-      }
-    }
-  }
-}
-
-func (game *Game) MoveEnemy(from Position, to Position) {
-  enemy, ok := game.enemies[from]
-  if !ok { log.Fatal("no enemy at", from, "wtf") }
-
-  delete(game.enemies, from)
-  game.enemies[to] = enemy
-}
-
-func (game *Game) CloneMap() Map {
-  // this is a shallow copy though
-  new_map := slices.Clone(game.level)
-
-  for i, row := range new_map {
-    // this makes sure the row is an actual copy
-    new_map[i] = slices.Clone(row)
-  }
-
-  return new_map
-}
-
-func (game *Game) PathAddNeighbors(neighbors []Position, closed Map, near Position) []Position {
-  points := compass(near.x, near.y, 1)
-
-  for _, pos := range points {
-    // NOTE: if you also add !game.Occupied(pos.x, pos.y) it ????
-    if closed[pos.y][pos.x] == SPACE {
-      closed[pos.y][pos.x] = WALL
-      neighbors = append(neighbors, pos)
-    }
-  }
-
-  return neighbors
-}
-
-func (game *Game) PathEnemies() {
-  in_grid := make([][]int, game.height, game.height)
-  game.FillPaths(in_grid, 1)
-  in_grid[game.player.pos.y][game.player.pos.x] = 0
-
-  game.FillPaths(game.paths, PATH_LIMIT)
-  closed := game.CloneMap()
-  starting_pixels := make([]Position, 0, 10)
-  open_pixels := make([]Position, 0, 10)
-
-  counter := 0
-
-  for counter < game.height * game.width {
-    x := counter % game.width
-    y := counter / game.width
-
-    if in_grid[y][x] == 0 {
-      game.paths[y][x] = 0
-      closed[y][x] = WALL
-      starting_pixels = append(starting_pixels, Position{x, y})
-    }
-
-    counter += 1
-  }
-
-  for _, pos := range starting_pixels {
-    open_pixels = game.PathAddNeighbors(open_pixels, closed, pos)
-  }
-
-  counter = 1
-  for counter < PATH_LIMIT && len(open_pixels) > 0 {
-    next_open := make([]Position, 0, 10)
-    for _, pos := range open_pixels {
-      game.paths[pos.y][pos.x] = counter
-      next_open = game.PathAddNeighbors(next_open, closed, pos)
-    }
-    open_pixels = next_open
-    counter += 1
-  }
-
-  for _, pos := range open_pixels {
-    game.paths[pos.y][pos.x] = counter
-  }
-}
-
-func (game *Game) EnemyMovement() {
-  for enemy_at, _ := range game.enemies {
-    // get the four directions
-    dirs := compass(enemy_at.x, enemy_at.y, 1)
-
-    // sort by closest path number
-    slices.SortFunc(dirs, func(a Position, b Position) int {
-      return game.paths[a.y][a.x] - game.paths[b.y][b.x]
-    })
-
-    // 0 dir is now the best direction
-    move_to := dirs[0]
-
-    // can we hear the player? occupied?
-    can_hear := game.paths[move_to.y][move_to.x] < HEARING_DISTANCE
-    occupied := game.Occupied(move_to.x, move_to.y)
-
-    if can_hear && !occupied {
-      // move the enemy in the best direction
-      game.MoveEnemy(enemy_at, move_to)
-    }
-  }
-}
-
-func (game *Game) AddRooms(dead_ends []Position, size int) {
-  rand.Shuffle(len(dead_ends), func(i, j int) {
-    dead_ends[i], dead_ends[j] = dead_ends[j], dead_ends[i]
-  })
-
-  for _, pos := range dead_ends[0:4] {
-    rs := rand.Int() % size + 1
-    game.CarveRoom(pos, rs)
-  }
-}
-
-func (game *Game) NewMap() []Position {
-  game.FillMap(game.level, '#')
-  dead_ends := game.HuntAndKill()
-
-  game.FillMap(game.level, '#')
-  game.AddRooms(dead_ends, game.height / 8)
-
-  dead_ends = game.HuntAndKill()
-
-  return dead_ends
-}
-
-func (game *Game) PlaceEnemies(places []Position) {
-  for _, pos := range places {
-    if rand.Int() % 2 == 0 {
-      game.enemies[pos] = &Enemy{10, pos, 4}
-    }
-  }
-}
-
 func main() {
-  out, err := os.Create("debug.log")
+  DebugInit()
-  if err != nil { log.Fatal(err) }
-  dbg = log.New(out, "", log.LstdFlags)
 
   game := NewGame(27, 17)
   game.InitScreen()
 
   for {
-    dead_ends := game.NewMap()
+    game.NewMap()
+    dead_ends := game.NewMaze()
     game.PlaceEnemies(dead_ends)
     game.Render()
 
-    for game.HandleEvents() && game.player.hp > 0 {
+    for game.HandleEvents() {
-      game.PathEnemies()
+      game.CalculatePaths()
-      game.EnemyMovement()
+      game.EnemyPathing()
       game.Render()
     }
 
+    if game.Player.HP <= 0 {
+      game.Restart()
+    } else {
       game.Exit()
     }
+  }
 }

03_pathing_enemies/map.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+  "slices"
+)
+
+func compass(near Position, offset int) []Position {
+  return []Position{
+    Position{near.X, near.Y - offset},
+    Position{near.X, near.Y + offset},
+    Position{near.X + offset, near.Y},
+    Position{near.X - offset, near.Y},
+  }
+}
+
+func (game *Game) CloneMap() Map {
+  // this is a shallow copy though
+  new_map := slices.Clone(game.Level)
+
+  for i, row := range new_map {
+    // this makes sure the row is an actual copy
+    new_map[i] = slices.Clone(row)
+  }
+
+  return new_map
+}
+
+func (game *Game) Inbounds(pos Position, offset int) bool {
+  return pos.X >= offset &&
+    pos.X < game.Width - offset &&
+    pos.Y >= offset &&
+    pos.Y < game.Height - offset
+}
+
+func (game *Game) Occupied(pos Position) bool {
+  _, is_enemy := game.Enemies[pos]
+  is_player := pos == game.Player.Pos
+
+  // Inbounds comes first to prevent accessing level with bad x,y
+  return !game.Inbounds(pos, 1) ||
+      game.Level[pos.Y][pos.X] == WALL ||
+      is_enemy ||
+      is_player
+}
+
+func (game *Game) FillMap(target Map, setting rune) {
+  for y := 0 ; y < game.Height; y++ {
+    target[y] = slices.Repeat([]rune{setting}, game.Width)
+  }
+}
+
+func (game *Game) NewMap() {
+  game.FillMap(game.Level, '#')
+}
+
+func (game *Game) Neighbors(near Position) []Position {
+  result := make([]Position, 0, 4)
+  points := compass(near, 2)
+
+  for _, pos := range points {
+    if game.Inbounds(pos, 0) {
+      result = append(result, pos)
+    }
+  }
+
+  return result
+}

03_pathing_enemies/maze.go

@@ -0,0 +1,83 @@
+package main
+
+import (
+  "math/rand"
+  "time"
+)
+
+func (game *Game) NeighborWalls(pos Position) []Position {
+  neighbors := game.Neighbors(pos)
+  result := make([]Position, 0)
+
+  for _, at := range neighbors {
+    cell := game.Level[at.Y][at.X]
+
+    if cell == WALL {
+      result = append(result, at)
+    }
+  }
+
+  return result
+}
+
+func (game *Game) HuntNext(on *Position, found *Position) bool {
+  for y := 1; y < game.Height ; y += 2 {
+    for x := 1; x < game.Width ; x += 2 {
+      if game.Level[y][x] != WALL {
+        continue
+      }
+
+      neighbors := game.Neighbors(Position{x, y})
+
+      for _, pos := range neighbors {
+        if game.Level[pos.Y][pos.X] == SPACE {
+          *on = Position{x, y}
+          *found = pos
+          return true
+        }
+      }
+    }
+  }
+
+  return false
+}
+
+func (game *Game) HAKStep(from Position, to Position) {
+  game.Level[from.Y][from.X] = SPACE
+  row := (from.Y + to.Y) / 2
+  col := (from.X + to.X) / 2
+  game.Level[row][col] = SPACE
+}
+
+func (game *Game) NewMaze() []Position {
+  on := Position{1, 1}
+  found := Position{1,1}
+
+  dead_ends := make([]Position, 0)
+
+  for {
+    neighbors := game.NeighborWalls(on)
+
+    if len(neighbors) == 0 {
+      dead_ends = append(dead_ends, on)
+
+      if !game.HuntNext(&on, &found) {
+        break
+      }
+
+      game.HAKStep(on, found)
+    } else {
+      rand_neighbor := rand.Int() % len(neighbors)
+      nb := neighbors[rand_neighbor]
+      game.HAKStep(nb, on)
+      on = nb
+    }
+
+    if SHOW_RENDER {
+      game.Render()
+      time.Sleep(50 * time.Millisecond)
+    }
+  }
+
+  return dead_ends
+}

03_pathing_enemies/movement.go

@@ -0,0 +1,21 @@
+package main
+
+
+func (game *Game) MoveEnemy(from Position, to Position) {
+  enemy, ok := game.Enemies[from]
+  if !ok { dbg.Fatal("no enemy at", from, "wtf") }
+
+  delete(game.Enemies, from)
+  game.Enemies[to] = enemy
+}
+
+func (game *Game) MovePlayer(x_delta int, y_delta int) {
+  target := Position{
+    game.Player.Pos.X + x_delta,
+    game.Player.Pos.Y + y_delta,
+  }
+
+  if !game.Occupied(target) {
+    game.Player.Pos = target
+  }
+}

03_pathing_enemies/pathing.go

@@ -0,0 +1,95 @@
+package main
+
+import (
+  "slices"
+)
+
+func (game *Game) FillPaths(target Paths, setting int) {
+  for y := 0 ; y < game.Height; y++ {
+    target[y] = slices.Repeat([]int{setting}, game.Width)
+  }
+}
+
+
+func (game *Game) PathAddNeighbors(neighbors []Position, closed Map, near Position) []Position {
+  points := compass(near, 1)
+
+  for _, pos := range points {
+    // NOTE: if you also add !game.Occupied(pos.x, pos.y) it ????
+    if closed[pos.Y][pos.X] == SPACE {
+      closed[pos.Y][pos.X] = WALL
+      neighbors = append(neighbors, pos)
+    }
+  }
+
+  return neighbors
+}
+
+func (game *Game) CalculatePaths() {
+  in_grid := make([][]int, game.Height, game.Height)
+  game.FillPaths(in_grid, 1)
+  in_grid[game.Player.Pos.Y][game.Player.Pos.X] = 0
+
+  game.FillPaths(game.Paths, PATH_LIMIT)
+  closed := game.CloneMap()
+  starting_pixels := make([]Position, 0, 10)
+  open_pixels := make([]Position, 0, 10)
+
+  counter := 0
+
+  for counter < game.Height * game.Width {
+    x := counter % game.Width
+    y := counter / game.Width
+
+    if in_grid[y][x] == 0 {
+      game.Paths[y][x] = 0
+      closed[y][x] = WALL
+      starting_pixels = append(starting_pixels, Position{x, y})
+    }
+
+    counter += 1
+  }
+
+  for _, pos := range starting_pixels {
+    open_pixels = game.PathAddNeighbors(open_pixels, closed, pos)
+  }
+
+  counter = 1
+  for counter < PATH_LIMIT && len(open_pixels) > 0 {
+    next_open := make([]Position, 0, 10)
+    for _, pos := range open_pixels {
+      game.Paths[pos.Y][pos.X] = counter
+      next_open = game.PathAddNeighbors(next_open, closed, pos)
+    }
+    open_pixels = next_open
+    counter += 1
+  }
+
+  for _, pos := range open_pixels {
+    game.Paths[pos.Y][pos.X] = counter
+  }
+}
+
+func (game *Game) EnemyPathing() {
+  for enemy_at, _ := range game.Enemies {
+    // get the four directions
+    dirs := compass(enemy_at, 1)
+
+    // sort by closest path number
+    slices.SortFunc(dirs, func(a Position, b Position) int {
+      return game.Paths[a.Y][a.X] - game.Paths[b.Y][b.X]
+    })
+
+    // 0 dir is now the best direction
+    move_to := dirs[0]
+
+    // can we hear the player? occupied?
+    can_hear := game.Paths[move_to.Y][move_to.X] < HEARING_DISTANCE
+    occupied := game.Occupied(move_to)
+
+    if can_hear && !occupied {
+      // move the enemy in the best direction
+      game.MoveEnemy(enemy_at, move_to)
+    }
+  }
+}

03_pathing_enemies/ui.go

@@ -0,0 +1,122 @@
+package main
+
+import (
+  "log"
+  "fmt"
+  "github.com/gdamore/tcell/v2"
+  "github.com/gdamore/tcell/v2/encoding"
+)
+
+//// DRAWING
+
+func (game *Game) DrawText(x int, y int, text string) {
+  for i, cell := range text {
+    game.Screen.SetContent(x+i, y, cell, nil, tcell.StyleDefault)
+  }
+}
+
+func (game *Game) DrawStatus() {
+  game.DrawText(0, game.Height, game.Status)
+
+  hp := fmt.Sprintf("HP: %d", game.Player.HP)
+
+  game.DrawText(game.Width - len(hp), game.Height, hp)
+}
+
+func (game *Game) SetStatus(msg string) {
+  game.Status = msg
+}
+
+func (game *Game) DrawEntity(symbol rune, pos Position, color tcell.Color) {
+  style := tcell.StyleDefault.Bold(true).Foreground(color)
+  game.Screen.SetContent(pos.X, pos.Y, symbol, nil, style)
+}
+
+func (game *Game) DrawMap() {
+  gray := tcell.StyleDefault.Foreground(tcell.ColorGray)
+
+  for y, line := range game.Level {
+    for x, cell := range line {
+      if cell == SPACE {
+        game.Screen.SetContent(x, y, cell, nil, gray)
+      } else {
+        game.Screen.SetContent(x, y, cell, nil, tcell.StyleDefault)
+      }
+    }
+  }
+}
+
+///// RENDERING
+
+func (game *Game) InitScreen() {
+  var err error
+  encoding.Register()
+
+  game.Screen, err = tcell.NewScreen()
+
+  // using log.Fatal instead of dbg.Fatal
+  // because the screen isn't setup yet
+  if err != nil { log.Fatal(err) }
+
+  err = game.Screen.Init()
+  if err != nil { log.Fatal(err) }
+}
+
+func (game *Game) Render() {
+  if !RENDER { return }
+
+  game.Screen.Clear()
+
+  game.DrawMap()
+
+  if SHOW_PATHS {
+    game.DrawPaths()
+  }
+
+  game.DrawEntity('@', game.Player.Pos, tcell.ColorYellow)
+
+  for pos, _ := range game.Enemies {
+    game.DrawEntity('G', pos, tcell.ColorRed)
+  }
+
+  game.DrawStatus()
+
+  game.Screen.Show()
+}
+
+//// EVENTS
+
+func (game *Game) HandleKeys(ev *tcell.EventKey) bool {
+  switch ev.Key() {
+  case tcell.KeyEscape:
+    return false
+  case tcell.KeyUp:
+    game.MovePlayer(0, -1)
+  case tcell.KeyDown:
+    game.MovePlayer(0, 1)
+  case tcell.KeyRight:
+    game.MovePlayer(1, 0)
+  case tcell.KeyLeft:
+    game.MovePlayer(-1, 0)
+  }
+
+  switch ev.Rune() {
+  case 'q':
+    return false
+  }
+
+  return true
+}
+
+func (game *Game) HandleEvents() bool {
+  if !RENDER { return false }
+
+  switch ev := game.Screen.PollEvent().(type) {
+  case *tcell.EventResize:
+    game.Screen.Sync()
+  case *tcell.EventKey:
+    return game.HandleKeys(ev)
+  }
+
+  return true
+}