#2 Start at the center of the screen. Always goes right. Sorta dies when it hits the border, but only when you are pressing a key. If it runs automatically into the border the game freezes.

game.go

@@ -14,6 +14,11 @@ const (
 	Down
 )
 
+const (
+	Over = iota
+	Running
+)
+
 func initilize() (tcell.Screen, tcell.Style, error) {
 	style := tcell.StyleDefault.Background(tcell.ColorReset).Foreground(tcell.ColorReset)
 
@@ -38,9 +43,12 @@ func quit(screen tcell.Screen) {
 	}
 }
 
-func game_director(screen tcell.Screen, style tcell.Style, keypresses chan int) {
+func gameDirector(screen tcell.Screen, style tcell.Style, keypresses chan int, gamestate chan int) {
+
+	// Destined to die, even before I was born.
+	defer quit(screen)
 
-	//var score int
+	//var score int = 0
 	//var scoreCounter int = 1
 	//var field [80][24]int
 	// fill up the field:
@@ -49,56 +57,59 @@ func game_director(screen tcell.Screen, style tcell.Style, keypresses chan int)
 	// 2: apple
 	// 3: border
 
-	x, y := screen.Size()
-	drawBox(screen, 0, 0, x-1, y-1, style)
-
-	var snakex int = 3
-	var snakey int = 12
-	//var lastpress int
+	var screenx = 80
+	var screeny = 24
+	var snakex int = (screenx / 2) - 1
+	var snakey int = (screeny / 2) - 1
+	var lastpress int = 1
 
 	for {
 
-		// Clean the screen
-		screen.Clear()
-
-		drawBox(screen, 0, 0, x-1, y-1, style)
-		updateScore(screen, style, snakex)
-
+		// Take input or sleep
 		select {
 		case press := <-keypresses:
-			if press == Left {
-				snakex--
-			} else if press == Right {
-				snakex++
-			} else if press == Up {
-				snakey--
-			} else if press == Down {
-				snakey++
-			}
-		case <-time.After(1 * time.Second):
-			snakex++
+			snakeDirection(press, &snakex, &snakey)
+			lastpress = press
+		case <-time.After(500 * time.Millisecond):
+			snakeDirection(lastpress, &snakex, &snakey)
 		}
 
-		//updateSnakePos(&snakex, &snakey)
+		if snakex == 0 || snakex == screenx-1 {
+			gamestate <- Over
+			return
+		} else if snakey == 0 || snakey == screeny-1 {
+			gamestate <- Over
+			return
+		}
+
+		// Clean the screen
+		screen.Clear()
+
+		// Draw the screen
+		drawBox(screen, 0, 0, screenx-1, screeny-1, style)
+		drawCoords(screen, style, &snakex, &snakey)
 		drawSnake(screen, style, snakex, snakey)
 
 		// Draw the screen
 		screen.Show()
 
-		if snakex > 75 {
-			return
-		}
-
-		time.Sleep(500 * time.Millisecond)
-
 	}
 
 }
 
-func keyboardProcessor(screen tcell.Screen, keypresses chan int) {
+func keyboardProcessor(screen tcell.Screen, keypresses chan int, gamestate chan int) {
 	defer close(keypresses)
 
 	for {
+
+		select {
+		case state := <-gamestate:
+			if state == Over {
+				return
+			}
+		case <-time.After(10 * time.Millisecond):
+		}
+
 		// Poll for an event
 		ev := screen.PollEvent()
 
@@ -110,7 +121,6 @@ func keyboardProcessor(screen tcell.Screen, keypresses chan int) {
 		//	updateScore(screen, style, snakex)
 		//	screen.Sync()
 		case *tcell.EventKey:
-			//fmt.Println("Key: ",ev.Rune())
 			if ev.Key() == tcell.KeyEscape || ev.Key() == tcell.KeyCtrlC {
 				return
 			} else if ev.Rune() == 'q' || ev.Rune() == 'Q' {
@@ -129,6 +139,7 @@ func keyboardProcessor(screen tcell.Screen, keypresses chan int) {
 				keypresses <- Up
 			}
 		}
+
 	}
 
 }

main.go

@@ -8,15 +8,15 @@ func main() {
 
 	// Create a channel to push key-presses through
 	keypresses := make(chan int)
+	gamestate := make(chan int)
 
 	screen, style, err := initilize()
 	if err != nil {
 		log.Fatalln("Initlization error: ", err)
 	}
+	defer quit(screen)
 
-	go game_director(screen, style, keypresses)
-	keyboardProcessor(screen, keypresses)
-
-	quit(screen)
+	go gameDirector(screen, style, keypresses, gamestate)
+	keyboardProcessor(screen, keypresses, gamestate)
 
 }

render.go

@@ -6,14 +6,6 @@ import (
 	"github.com/gdamore/tcell/v2"
 )
 
-/*
-func renderScreen(&screen tcell.Screen, event tcell.Event, score int) {
-	if checkSize(*screen) == false {
-		return
-	}
-}
-*/
-
 func checkSize(screen tcell.Screen) bool {
 	var retval bool = true
 	x, y := screen.Size()
@@ -26,16 +18,22 @@ func checkSize(screen tcell.Screen) bool {
 	return retval
 }
 
-func updateScore(screen tcell.Screen, style tcell.Style, score int) {
-	var x, y int
-	_, y = screen.Size()
-	x = 5
+func drawScore(screen tcell.Screen, style tcell.Style, score int) {
+	var x, y int = 5, 24
 	for _, r := range []rune("[ Score: " + strconv.FormatInt(int64(score), 10) + " ]") {
 		screen.SetContent(x, y-1, r, nil, style)
 		x++
 	}
 }
 
+func drawCoords(screen tcell.Screen, style tcell.Style, snakex *int, snakey *int) {
+	var x, y int = 25, 24
+	for _, r := range []rune("[ x:" + strconv.FormatInt(int64(*snakex), 10) + " y: " + strconv.FormatInt(int64(*snakey), 10) + " ]") {
+		screen.SetContent(x, y-1, r, nil, style)
+		x++
+	}
+}
+
 func drawBox(s tcell.Screen, x1, y1, x2, y2 int, style tcell.Style) {
 	if y2 < y1 {
 		y1, y2 = y2, y1
@@ -69,6 +67,4 @@ func drawBox(s tcell.Screen, x1, y1, x2, y2 int, style tcell.Style) {
 		s.SetContent(x2, y2, '╝', nil, style)
 	}
 
-	//drawText(s, x1+1, y1+1, x2-1, y2-1, style, text)
-	updateScore(s, style, 10)
 }

snake.go

@@ -4,10 +4,18 @@ import (
 	"github.com/gdamore/tcell/v2"
 )
 
-func updateSnakePos(x *int, y *int) {
-	*x = *x + 1
-}
-
 func drawSnake(screen tcell.Screen, style tcell.Style, x int, y int) {
 	screen.SetContent(x, y, '🐍', nil, style)
 }
+
+func snakeDirection(press int, snakex *int, snakey *int) {
+	if press == Left {
+		*snakex--
+	} else if press == Right {
+		*snakex++
+	} else if press == Up {
+		*snakey--
+	} else if press == Down {
+		*snakey++
+	}
+}