Rotating and Flipping a bitmap

Assuming the image you have to work with is rotated on both x- and y- axes ... in other words, it's a "mirror image."

In C#: Button 'btnFlipXY, and PictureBox 'pbxImage on a Form. PictureBox 'SizeMode Property set to 'AutoSize

// required
using System.Drawing;

// Click EventHandler for 'btnFlipXY
private void btnFlipXY_Click(object sender, EventArgs e)
{
   Bitmap theImage = pbxImage.Image as Bitmap;
   theImage.RotateFlip(RotateFlipType.RotateNoneFlipXY);
   pbxImage.Image = theImage;
}

Click the Button once and select the Points, and store the Points in whatever data-structure you've chosen. Click a second time, and the image is restored to its original orientation.

In VB.NET WinForms:

Private Sub btnFlipXY_Click(sender As Object, e As EventArgs) Handles btnFlipXY.Click

    Dim theImage
    theImage = pbxImage.Image

    theImage.RotateFlip(RotateFlipType.RotateNoneFlipXY)
    pbxImage.Image = theImage

End Sub

This is the first time I have ever coded in VB, so I don't know why a conversion of the PictureBox.Image to Type 'Bitmap is not required in VB. A quick search on the web suggests this declaration would be better:

Dim theImage As New Bitmap(pbxImage.Image)