Use the Bitmap class’s RotateFlip method to easily flip and rotate an image in C#


The Bitmap class’s RotateFlip method makes it easy to rotate an image by a multiple of 90 degrees and flip it vertically or horizontally. This example wraps the call to RotateFlip in the following ModifiedBitmap method. It makes a copy of an image, rotates and flips the copy, and returns the result.

// Copy the bitmap, rotate it, and return the result.
private Bitmap ModifiedBitmap(Image original_image,
    RotateFlipType rotate_flip_type)
    // Copy the Bitmap.
    Bitmap new_bitmap = new Bitmap(original_image);

    // Rotate and flip.

    // Return the result.
    return new_bitmap;

The following code shows how the program calls this method to rotate the image 180 degrees and then flip it horizontally:

private void rad270FlipX_CheckedChanged(object sender, EventArgs e)
    picResult.Image = ModifiedBitmap(
        picOriginal.Image, RotateFlipType.Rotate270FlipX);

After rotating or flipping a Bitmap, you can use its Save method to save the result into a file.

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