Finally have a map displaying.

main.go

@@ -2,67 +2,56 @@
 package main
 
 import (
-    "fmt"
   "os"
-
+  "log"
   "github.com/gdamore/tcell/v2"
   "github.com/gdamore/tcell/v2/encoding"
-
-    "github.com/mattn/go-runewidth"
 )
 
-func emitStr(s tcell.Screen, x, y int, style tcell.Style, str string) {
-    for _, c := range str {
+func DisplayMap(screen tcell.Screen, level []string) {
+  screen.Clear()
+
+  for y, line := range level {
+    for x, cell := range line {
       var comb []rune
-        w := runewidth.RuneWidth(c)
-        if w == 0 {
-            comb = []rune{c}
-            c = ' '
-            w = 1
-        }
-        s.SetContent(x, y, c, comb, style)
-        x += w
+      screen.SetContent(x, y, cell, comb, tcell.StyleDefault)
     }
   }
 
-func displayHelloWorld(s tcell.Screen) {
-    w, h := s.Size()
-    s.Clear()
-    style := tcell.StyleDefault.Foreground(tcell.ColorCadetBlue.TrueColor()).Background(tcell.ColorWhite)
-    emitStr(s, w/2-7, h/2, style, "Hello, World!")
-    emitStr(s, w/2-9, h/2+1, tcell.StyleDefault, "Press ESC to exit.")
-    s.Show()
+  screen.Show()
 }
 
 // This program just prints "Hello, World!".  Press ESC to exit.
 func main() {
+  level := []string{
+    "####################",
+    "###....#############",
+    "###....#############",
+    "###...........######",
+    "#############.######",
+    "#############....###",
+    "#############....###",
+    "####################",
+  }
+
   encoding.Register()
 
-    s, e := tcell.NewScreen()
-    if e != nil {
-        fmt.Fprintf(os.Stderr, "%v\n", e)
-        os.Exit(1)
-    }
-    if e := s.Init(); e != nil {
-        fmt.Fprintf(os.Stderr, "%v\n", e)
-        os.Exit(1)
-    }
+  screen, err := tcell.NewScreen()
+  if err != nil { log.Fatal(err) }
 
-    defStyle := tcell.StyleDefault.
-    Background(tcell.ColorBlack).
-    Foreground(tcell.ColorWhite)
-    s.SetStyle(defStyle)
+  err = screen.Init();
+  if err != nil { log.Fatal(err) }
 
-    displayHelloWorld(s)
+  DisplayMap(screen, level)
 
   for {
-        switch ev := s.PollEvent().(type) {
+    switch ev := screen.PollEvent().(type) {
     case *tcell.EventResize:
-            s.Sync()
-            displayHelloWorld(s)
+      screen.Sync()
+      DisplayMap(screen, level)
     case *tcell.EventKey:
       if ev.Key() == tcell.KeyEscape {
-                s.Fini()
+        screen.Fini()
         os.Exit(0)
       }
     }