Image Thumbnail Viewer

Option Explicit
Public Sub ViewImage(strFile As String, picTemp As PictureBox, picTarget As PictureBox)
  Dim x&, y&, x1&, y1&, z1!
  Dim sNoPreview$
  On Error GoTo ErrorHandler
 'Set default stuffs
 picTarget.Cls
 picTarget.AutoRedraw = True
 picTemp.Visible = False
 picTemp.AutoSize = True
 'get target sizing info
 x = picTarget.width
 y = picTarget.height
 'Load the image
 picTemp.Picture = LoadPicture(strFile)
 'get source sizing info
 x1 = picTemp.width
 y1 = picTemp.height
 'Determin conversion ratio to use
 z1 = IIf(x / x1 * y1 < y, x / x1, y / y1)
 'Calculate new image size
 x1 = x1 * z1
 y1 = y1 * z1
 'Draw Image
 picTarget.PaintPicture picTemp.Picture, (x - x1) / 2, (y - y1) / 2, x1, y1
 Exit Sub
ErrorHandler:
 'set temp image to nothing
 picTemp.Picture = LoadPicture()
 'Display default error message
 sNoPreview = "No Preview Available"
 picTarget.CurrentX = x / 2 - picTarget.TextWidth(sNoPreview) / 2
 picTarget.CurrentY = y / 2 - picTarget.TextHeight(sNoPreview) / 2
 picTarget.Print sNoPreview
End Sub