Cleaned up the code some and made the player and can move them around with wall collision.

main.go

@@ -8,52 +8,114 @@ import (
   "github.com/gdamore/tcell/v2/encoding"
 )
 
-func DisplayMap(screen tcell.Screen, level []string) {
-  screen.Clear()
 
-  for y, line := range level {
-    for x, cell := range line {
+type Game struct {
+  screen tcell.Screen
+  level []string
+  player_x int
+  player_y int
+}
+
+func (game *Game) Render() {
   var comb []rune
-      screen.SetContent(x, y, cell, comb, tcell.StyleDefault)
+  game.screen.Clear()
+
+  for y, line := range game.level {
+    for x, cell := range line {
+      game.screen.SetContent(x, y, cell, comb, tcell.StyleDefault)
     }
   }
 
-  screen.Show()
+  game.screen.SetContent(game.player_x, game.player_y, '@', comb, tcell.StyleDefault)
+
+  game.screen.Show()
 }
 
-// This program just prints "Hello, World!".  Press ESC to exit.
-func main() {
-  level := []string{
-    "####################",
-    "###....#############",
-    "###....#############",
-    "###...........######",
-    "#############.######",
-    "#############....###",
-    "#############....###",
-    "####################",
+func (game *Game) Exit() {
+    game.screen.Fini()
+    os.Exit(0)
+}
+
+func (game *Game) Occupied(x int, y int) bool {
+  return game.level[y][x] != '.'
+}
+
+func (game *Game) MovePlayer(x_delta int, y_delta int) {
+  if !game.Occupied(game.player_x + x_delta, game.player_y + y_delta) {
+    game.player_x += x_delta
+    game.player_y += y_delta
+  }
+}
+
+func (game *Game) HandleKeys(ev *tcell.EventKey) {
+  switch ev.Key() {
+  case tcell.KeyEscape:
+    game.Exit()
+  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':
+    game.Exit()
+  }
+}
+
+func (game *Game) HandleEvents() {
+  switch ev := game.screen.PollEvent().(type) {
+  case *tcell.EventResize:
+    game.screen.Sync()
+  case *tcell.EventKey:
+    game.HandleKeys(ev)
   }
+}
+
+func MakeGame() (*Game) {
+  var game Game
+  var err error
 
   encoding.Register()
 
-  screen, err := tcell.NewScreen()
+  game.screen, err = tcell.NewScreen()
   if err != nil { log.Fatal(err) }
 
-  err = screen.Init();
+  err = game.screen.Init()
   if err != nil { log.Fatal(err) }
 
-  DisplayMap(screen, level)
+  game.player_x = 1
+  game.player_y = 1
 
-  for {
-    switch ev := screen.PollEvent().(type) {
-    case *tcell.EventResize:
-      screen.Sync()
-      DisplayMap(screen, level)
-    case *tcell.EventKey:
-      if ev.Key() == tcell.KeyEscape {
-        screen.Fini()
-        os.Exit(0)
-      }
+  return &game
+}
+
+// This program just prints "Hello, World!".  Press ESC to exit.
+func main() {
+  game := MakeGame()
+
+  game.level = []string{
+    "###########################",
+    "#...#.....................#",
+    "#.###.#########.#########.#",
+    "#.....#.......#...#.....#.#",
+    "#######.#####.#####.###.#.#",
+    "#.....#.#.......#...#...#.#",
+    "#.###.#.#.....#.#.#.#.###.#",
+    "#...#.#.#.....#.#.#.#.....#",
+    "###.#.#.#.....#.#.#.#######",
+    "#...#...#.....#...#.......#",
+    "###########################",
   }
+
+  game.Render()
+
+  for {
+    game.HandleEvents()
+    game.Render()
   }
 }