by Aldo Vargas (5 Submissions)
Category: Graphics
Compatability: Visual Basic 3.0
Difficulty: Intermediate
Date Added: Wed 3rd February 2021
Rating: 
(4 Votes)
This code shows how to scroll with the mouse a large image that is contained in a small container.
Assumes
This example needs that you place a PictureBox and an Image in a form.
VBcodersOption Explicit
Dim px As Long, py As Long
Dim gapx As Long, gapy As Long
Private Sub Form_Load()
Set Image1.Container = Picture1
Image1.Stretch = True
Image1.Picture = LoadPicture("C:\Windows\Bubbles.bmp")
Picture1.Move 60, 60, 6000, 4000
Image1.Move -1000, -1000, 10000, 10000
Me.Move Screen.Width \ 2 - 3100, Screen.Height \ 2 - 2250, 6200, 4500
End Sub
Private Sub image1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
px = X
py = Y
gapx = Picture1.Width - Image1.Width
gapy = Picture1.Height - Image1.Height
Image1.MousePointer = 15
End Sub
Private Sub image1_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim deltax As Long, deltay As Long
If Button = vbLeftButton Then
X = CLng(X)
Y = CLng(Y)
If Abs(X - px) < 30 Then
ElseIf X < px Then
deltax = Abs(X - px)
If Image1.Left - deltax >= gapx Then
Image1.Left = Image1.Left - deltax
ElseIf gapx <= 0 Then
Image1.Left = gapx
Else
Image1.Left = 0
End If
px = X + deltax
ElseIf X > px Then
deltax = Abs(X - px)
If Image1.Left + deltax <= 0 Then
Image1.Left = Image1.Left + deltax
Else
Image1.Left = 0
End If
px = X - deltax
End If
If Abs(Y - py) < 30 Then
ElseIf Y < py Then
deltay = Abs(Y - py)
If Image1.Top - deltay >= gapy Then
Image1.Top = Image1.Top - deltay
ElseIf gapy <= 0 Then
Image1.Top = gapy
Else
Image1.Top = 0
End If
py = Y + deltay
ElseIf Y > py Then
deltay = Abs(Y - py)
If Image1.Top + deltay <= 0 Then
Image1.Top = Image1.Top + deltay
Else
Image1.Top = 0
End If
py = Y - deltay
End If
End If
End Sub
Private Sub image1_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
Image1.MousePointer = 0
End Sub