Rotate and flip images in c# - Tutorial on creating desktop apps in C# language

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Image.RotateFlip(RotateFlipType) Method (System.Drawing)
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Image.RotateFlip(RotateFlipType) Method

Reference

Definition

Namespace:
System.Drawing

Assembly:
System.Drawing.Common.dll

Rotates, flips, or rotates and flips the Image.
C#

public void RotateFlip (System.Drawing.RotateFlipType rotateFlipType);

Parameters

rotateFlipType
RotateFlipType

A RotateFlipType member that specifies the type of rotation and flip to apply to the image.
Examples

The following code example demonstrates how to call the RotateFlip method on an Image and the RotateFlipType enumeration.

This example is designed to be used with a Windows Form that contains a PictureBox named PictureBox1 and a button named Button1. Paste the code into a form, call InitializeBitmap from the form's constructor, and associate Button1_Click with the button's Click event. Ensure the file path to the bitmap is valid on your system.
C#

Bitmap bitmap1;

private void InitializeBitmap()
{
try
{
bitmap1 = (Bitmap)Bitmap.FromFile(@"C:\Documents and Settings\" +
@"All Users\Documents\My Music\music.bmp");
PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
PictureBox1.Image = bitmap1;
}
catch(System.IO.FileNotFoundException)
{
MessageBox.Show("There was an error." +
"Check the path to the bitmap.");
}
}

private void Button1_Click(System.Object sender, System.EventArgs e)
{

if (bitmap1 != null)
{
bitmap1.RotateFlip(RotateFlipType.Rotate180FlipY);
PictureBox1.Image = bitmap1;
}
}

Remarks

The RotateFlip method rotates the image clockwise.

If you wish to draw on an image once it has been rotated, you should always retrieve a new graphics object from the image, otherwise an exception could occur.

source
https://docs.microsoft.com/en-us/dotn...