How to rotate a PictureBox on a windows form using vb.net

Question

I need to rotate a picture box 180 degrees when a condition in my if statement is met. Is this possible?

Answer 1

I'll assume that you want to rotate the image inside, because rotating the box itself doesn't make much sense (and is impossible anyway).

Try this:

myPictureBox.Image.RotateFlip(RotateFlipType.Rotate180FlipNone);

Answer 2

PictureBox1.Image.RotateFlip(RotateFlipType.Rotate180FlipNone)
PictureBox1.Refresh()

When you try to rotate your image with:

PictureBox1.Image.RotateFlip(RotateFlipType.Rotate180FlipNone)

nothing will happen until you close the form and open it again (not the project, just the form). If you want to rotate at once then you should use PictureBox1.Refresh() .

Answer 3

The System.Drawing.Image.RotateFlip() method allows you to rotate the actual image displayed in the picturebox. See this page

Dim bitmap1 As Bitmap

Private Sub InitializeBitmap()
    Try
        bitmap1 = CType(Bitmap.FromFile("C:\Documents and Settings\All Users\" _
            & "Documents\My Music\music.bmp"), Bitmap)
        PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize
        PictureBox1.Image = bitmap1
    Catch ex As System.IO.FileNotFoundException
        MessageBox.Show("There was an error. Check the path to the bitmap.")
    End Try


End Sub

Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    If bitmap1 IsNot Nothing Then
   bitmap1.RotateFlip(RotateFlipType.Rotate180FlipY)
        PictureBox1.Image = bitmap1
    End If

End Sub

Answer 4

您可以掌握http://www.codeproject.com/KB/cpp/rimage.aspx中给出的C ++概念，并可以在http://www.eggheadcafe.com/community/aspnet/中给出的VB.net中使用。一千零五万三千八百十七分之十四/旋转-PictureBox的-contr.aspx