我正在使用visual basic在visual studio中写一个蛇游戏。
比赛场地是2D盒子的PictureBoxes。 My Snake是Point类型的一维数组。蛇阵列被称为'蛇'。
当表单加载时，Snake（0）被设置为New Point（1,1）。我创建了一个子程序，根据用户按下的箭头键移动蛇。这是一个计时器。蛇（0）（蛇头）设置为等于Snake（0）+方向（方向是由用户按下的箭头键改变的变量，例如，当按下向上方向设置为x：0和y时： -1）
当蛇（0）击中一块食物时，蛇形阵列中的元素数量被设置为数组的长度。 EG（如果是蛇（0）= foodPosition那么ReDim保留蛇（snake.Length）结束如果）
我已经在定时器下创建了一个循环，使蛇的身体跟随头部（例如，蛇（2）=蛇（1）和蛇（1）=蛇（0）但不能让它工作）
代码：
Public Class frmPlayfield
'Food Creating and Grow Snake Variables
Dim randF As New Random
Dim foodPointX As Integer = randF.Next(0, 32)
Dim foodPointY As Integer = randF.Next(0, 32)
'Play Field Variables
Dim playMaxWidth As Integer = 32
Dim playMaxHeight As Integer = 32
Dim boxSize As Integer = 16 'Size of PictureBox
Dim boxArray(,) As PictureBox 'PictureBox Array
'Snake Stuff Variable
Dim snake(1) As Point 'Snake array
Dim direction As New Point(1, 0) 'Direction for snake movement
Private Sub frmPlayfield_Load(sender As Object, e As EventArgs) Handles MyBase.Load
ReDim boxArray(playMaxWidth, playMaxHeight)
For x As Integer = 0 To playMaxWidth
For y As Integer = 0 To playMaxHeight
boxArray(x, y) = New PictureBox
boxArray(x, y).Width = boxSize
boxArray(x, y).Height = boxSize
boxArray(x, y).Top = y * boxSize
boxArray(x, y).Left = x * boxSize
boxArray(x, y).Visible = True
boxArray(x, y).BackColor = Color.White
boxArray(x, y).BorderStyle = BorderStyle.FixedSingle
Me.Controls.Add(boxArray(x, y))
Next
Next
Me.ClientSize = New Size((playMaxWidth + 1) * boxSize, (playMaxHeight + 1) * boxSize)
snake(0) = New Point(1, 1) 'Creates snake head
boxArray(foodPointX, foodPointY).BackColor = Color.Red
End Sub
Private Function createBox(x As Integer, y As Integer, bSize As Integer) As PictureBox
Dim tempBox As New PictureBox
tempBox.Width = bSize
tempBox.Height = bSize
tempBox.Top = y * bSize
tempBox.Left = x * bSize
tempBox.Visible = True
tempBox.BackColor = Color.White
tempBox.BorderStyle = BorderStyle.FixedSingle
Me.Controls.Add(tempBox)
Return tempBox
End Function
Private Sub Food()
If snake(0).X = foodPointX And snake(0).Y = foodPointY Then
ReDim Preserve snake(snake.Length) 'Increases the amount of elements in the snake array.
For j As Integer = 0 To 0
foodPointX = randF.Next(0, 32)
foodPointY = randF.Next(0, 32)
boxArray(foodPointX, foodPointY).BackColor = Color.Red
Next
End If
For h As Integer = snake.Length - 1 To snake.GetUpperBound(0)
snake(h) = snake(snake.Length - 2)
Next
End Sub
Private Sub CheckBoundsAndMovement()
For i As Integer = 0 To snake.GetUpperBound(0)
boxArray(snake(i).X, snake(i).Y).BackColor = Color.White 'Loop to change the whole snake black
Next
snake(1) = snake(0)
snake(0) = snake(0) + direction
If snake(0).X > playMaxWidth Then
snake(0).X -= (playMaxWidth + 1)
End If
If snake(0).X < 0 Then
snake(0).X += (playMaxWidth + 1)
End If 'Four If statements to check if the snake has gone outside the play area.
If snake(0).Y > playMaxWidth Then
snake(0).Y -= (playMaxWidth + 1)
End If
If snake(0).Y < 0 Then
snake(0).Y += (playMaxWidth + 1)
End If
For k As Integer = 0 To snake.GetUpperBound(0)
boxArray(snake(k).X, snake(k).Y).BackColor = Color.Black 'Loop to make the whole snake black
Next
End Sub
Private Sub timGameTick_Tick(sender As Object, e As EventArgs) Handles timGameTick.Tick
Food()
CheckBoundsAndMovement()
End Sub
Private Sub frmPlayfield_KeyDown(sender As Object, e As KeyEventArgs) Handles MyBase.KeyDown 'Subroutine for direction
Select Case (e.KeyCode)
Case Keys.Up
direction = New Point(0, -1)
Case Keys.Down
direction = New Point(0, 1)
Case Keys.Left
direction = New Point(-1, 0)
Case Keys.Right
direction = New Point(1, 0)
End Select
End Sub
End Class
吃完第一块食物后，这种方法很好。长度为2的蛇的长度增加到3个。但是当我吃另一块食物时，蛇的末端留在食物被吃掉的地方。
答案 0 :(得分：0)
好的 - 看起来我发现了问题 -
首先关闭 - 您将snake数组定义为Dim snake (1) As Point这创建了具有两个元素的数组，而不是1
接下来，在你的Food sub中，每次蛇移动时都应该循环将像素卷回蛇身上，而不仅仅是在食用食物时。所以我将它移动到CheckBoundsAndMovement子中以替换该子线的第4行，该线仅将头部的位置复制到下一个点而不是整个蛇。但是当然，当蛇的长度只有一个像素时尝试执行循环会导致数组超出范围异常，所以添加If语句只在snake长度执行循环{} 1}}超过1.
此外，代码中循环的方向也在递增。要正确地做它应该按递减顺序。这样，循环覆盖表示尾部结束的点，下一个点向前，依此类推。最后，将头部的新位置输入snake(0)
所以 - 这里是 -
Public Class frmPlayfield
'Food Creating and Grow Snake Variables
Dim randF As New Random
Dim foodPointX As Integer = randF.Next(0, 32)
Dim foodPointY As Integer = randF.Next(0, 32)
'Play Field Variables
Dim playMaxWidth As Integer = 32
Dim playMaxHeight As Integer = 32
Dim boxSize As Integer = 16 'Size of PictureBox
Dim boxArray(,) As PictureBox 'PictureBox Array
'Snake Stuff Variable
Dim snake(0) As Point 'Snake array
Dim direction As New Point(1, 0) 'Direction for snake movement
Private Sub frmPlayfield_Load(sender As Object, e As EventArgs) Handles MyBase.Load
ReDim boxArray(playMaxWidth, playMaxHeight)
For x As Integer = 0 To playMaxWidth
For y As Integer = 0 To playMaxHeight
boxArray(x, y) = New PictureBox
boxArray(x, y).Width = boxSize
boxArray(x, y).Height = boxSize
boxArray(x, y).Top = y * boxSize
boxArray(x, y).Left = x * boxSize
boxArray(x, y).Visible = True
boxArray(x, y).BackColor = Color.White
boxArray(x, y).BorderStyle = BorderStyle.FixedSingle
Me.Controls.Add(boxArray(x, y))
Next
Next
Me.ClientSize = New Size((playMaxWidth + 1) * boxSize, (playMaxHeight + 1) * boxSize)
snake(0) = New Point(1, 1) 'Creates snake head
boxArray(foodPointX, foodPointY).BackColor = Color.Red
End Sub
Private Function createBox(x As Integer, y As Integer, bSize As Integer) As PictureBox
Dim tempBox As New PictureBox
tempBox.Width = bSize
tempBox.Height = bSize
tempBox.Top = y * bSize
tempBox.Left = x * bSize
tempBox.Visible = True
tempBox.BackColor = Color.White
tempBox.BorderStyle = BorderStyle.FixedSingle
Me.Controls.Add(tempBox)
Return tempBox
End Function
Private Sub Food()
If snake(0).X = foodPointX And snake(0).Y = foodPointY Then
ReDim Preserve snake(snake.Length)
foodPointX = randF.Next(0, 32)
foodPointY = randF.Next(0, 32)
boxArray(foodPointX, foodPointY).BackColor = Color.Red
End If
End Sub
Private Sub CheckBoundsAndMovement()
For i As Integer = 0 To snake.GetUpperBound(0)
boxArray(snake(i).X, snake(i).Y).BackColor = Color.White 'Loop to change the whole snake white
boxArray(snake(i).X, snake(i).Y).Update()
Next
If snake.Length > 1 Then
For i As Integer = snake.GetUpperBound(0) To 1 Step -1
snake(i) = snake(i - 1)
Next
End If
snake(0) = snake(0) + direction
If snake(0).X > playMaxWidth Then
snake(0).X -= (playMaxWidth + 1)
End If
If snake(0).X < 0 Then
snake(0).X += (playMaxWidth + 1)
End If 'Four If statements to check if the snake has gone outside the play area.
If snake(0).Y > playMaxWidth Then
snake(0).Y -= (playMaxWidth + 1)
End If
If snake(0).Y < 0 Then
snake(0).Y += (playMaxWidth + 1)
End If
For k As Integer = 0 To snake.GetUpperBound(0)
boxArray(snake(k).X, snake(k).Y).BackColor = Color.Black 'Loop to make the whole snake black
Next
End Sub
Private Sub timGameTick_Tick(sender As Object, e As EventArgs) Handles timGameTick.Tick
Food()
CheckBoundsAndMovement()
End Sub
Private Sub frmPlayfield_KeyDown(sender As Object, e As KeyEventArgs) Handles MyBase.KeyDown 'Subroutine for direction
Select Case (e.KeyCode)
Case Keys.Up
direction = New Point(0, -1)
Case Keys.Down
direction = New Point(0, 1)
Case Keys.Left
direction = New Point(-1, 0)
Case Keys.Right
direction = New Point(1, 0)
End Select
End Sub
End Class