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Public Class Form1
    Dim a(5, 5) As Double
    Dim colors(5, 5) As Color
    Dim rand As Random = New Random
    Dim ballsize As Integer = 20
    Dim x, y, vx, vy As Integer


    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        For i = 0 To a.GetUpperBound(0)

            For j = 0 To a.GetUpperBound(0)
                a(i, j) = 1
                colors(i, j) = Color.FromArgb(rand.Next(255), rand.Next(255), rand.Next(255)) 
            Next
        Next
        Me.DoubleBuffered = True

        x = 300
        y = 300
        vx = rand.NextDouble * 20 - 10
        vy = rand.NextDouble * 20 - 10

        Timer1.Start()
        Timer1.Interval = 10
    End Sub



    Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles MyBase.Paint
        Dim w, h As Integer
        w = Me.Width
        h = 80

        For i = 0 To a.GetUpperBound(0)

            For j = 0 To a.GetUpperBound(0)
                If a(i, j) = 1 Then
                    e.Graphics.FillRectangle(New SolidBrush(colors(i, j)), _
                                             CInt(j * w / a.GetLength(1)), _
                                             CInt(i * h / a.GetLength(0)), _
                                            CInt(w / a.GetLength(1)), _
                                            CInt(h / a.GetLength(0)))
                End If
            Next
        Next

        e.Graphics.FillEllipse(New SolidBrush(Color.Red), _
                                             CInt(x - ballsize), _
                                             CInt(y - ballsize), _
                                            CInt(ballsize * 2), _
                                            CInt(ballsize * 2))

    End Sub
    Private Sub Form1_SizeChanged(sender As Object, e As EventArgs) Handles MyBase.SizeChanged
        Refresh()
    End Sub
    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        Dim w, h As Integer
        w = Me.Width
        h = 80
        x = x + vx
        y = y + vy
        If x + ballsize > Me.Width Then
            x = Me.Width - ballsize
            vx = vx * -1
        End If

        If y + ballsize > Me.Height Then
            y = Me.Height - ballsize
            vy = vy * -1
        End If
        If x - ballsize < 0 Then
            x = 0 + ballsize
            vx = vx * -1
        End If

        If y - ballsize < 0 Then
            y = 0 + ballsize
            vy = vy * -1
        End If

        For i = 0 To a.GetUpperBound(0)

            For j = 0 To a.GetUpperBound(0)
                If a(i, j) = 1 Then
                    If x - ballsize < j * w / a.GetLength(1) + w / a.GetLength(1) And _
                       x - ballsize > j * w / a.GetLength(1) And _
                       y - ballsize < i * h / a.GetLength(0) + h / a.GetLength(0) And _
                       y - ballsize > i * h / a.GetLength(0) _
                       Then
                        a(i, j) = 0
                        vy = vy * -1
                    End If
                End If
            Next
        Next
        Refresh()
    End Sub
End Class

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