#5 Print single line tail

snake.go

@@ -35,6 +35,8 @@ func initSnake(snakex *int, snakey *int) Snake {
 
 func drawSnake(screen tcell.Screen, style tcell.Style, snake *Snake) {
 
+	var tail []rune
+
 	// Reverse tail, chop of the excesses,
 	snake.tail = ReverseSlice(snake.tail)
 	if len(snake.tail) > snake.length {
@@ -43,9 +45,32 @@ func drawSnake(screen tcell.Screen, style tcell.Style, snake *Snake) {
 	// reverse it back to the original order, replace the tail in `snake`
 	snake.tail = ReverseSlice(snake.tail)
 
+	for i, j := range snake.tail {
+		// The Tail end
+		if i == 0 {
+			left := getDirection(j, snake.tail[i+1])
+			right := getDirection(j, snake.tail[i+1])
+			tail = append(tail, getLineType(left, right))
+
+			// The Bit behind the head
+		} else if i == len(snake.tail)-1 {
+			left := getDirection(j, snake.tail[i-1])
+			right := getDirection(j, snake.head)
+			tail = append(tail, getLineType(left, right))
+
+			// The body of the snake
+		} else {
+			left := getDirection(j, snake.tail[i-1])
+			right := getDirection(j, snake.tail[i+1])
+			tail = append(tail, getLineType(left, right))
+
+		}
+
+	}
+
 	// Draw the body
-	for _, segment := range snake.tail {
-		screen.SetContent(segment.x, segment.y, '+', nil, style)
+	for i, segment := range snake.tail {
+		screen.SetContent(segment.x, segment.y, tail[i], nil, style)
 	}
 
 	// Draw the head, make sure it is on top of everything
@@ -109,3 +134,41 @@ func validateDirection(snake *Snake, direction int) bool {
 		return true
 	}
 }
+
+func getDirection(from Position, to Position) int {
+
+	var direction int
+
+	if from.x-to.x == 1 {
+		direction = Left
+	} else if from.x-to.x == -1 {
+		direction = Right
+	} else if from.y-to.y == 1 {
+		direction = Up
+	} else if from.y-to.y == -1 {
+		direction = Down
+	}
+
+	return direction
+}
+
+func getLineType(from int, to int) rune {
+
+	var lineType rune
+
+	if (from == Left && to == Down) || (from == Down && to == Left) {
+		lineType = '┐'
+	} else if (from == Up && to == Right) || (from == Right && to == Up) {
+		lineType = '└'
+	} else if (from == Left && to == Right) || (from == Right && to == Left) {
+		lineType = '─'
+	} else if (from == Left && to == Up) || (from == Up && to == Left) {
+		lineType = '┘'
+	} else if (from == Right && to == Down) || (from == Down && to == Right) {
+		lineType = '┌'
+	} else if (from == Up && to == Down) || (from == Down && to == Up) {
+		lineType = '│'
+	}
+
+	return lineType
+}