Rotate and Flip Images in Windows Forms

Shubham Saxena

flip Imagesflip Images in Windows FormRotate ImagesRotate Images in Windows Form

8 Comments

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Robert Murphy3y ago
After many failed attempts to rotate and and image and add a caption I found your solution. Your solution works.
David Carlson5y ago
Thanks, this works even if the angle is 90.0.
Shubham Saxena13y ago
use the same events and change the code inside them.... i.e use imagebox1.ImageLocation = "your location";
Keerthana Bhaskaran13y ago
Thank u so much....Its really helpful. And I am in need of another help in changing the images also ie already an image will be set to a button and by placing the mouse over the button the image should also be altered. How to import both the images
Shubham Saxena13y ago
create two events, MouseHover() and MouseLeave(), use button1.BackColor = Color.Aqua; to change color according to your choice.. Done. :)
Keerthana Bhaskaran13y ago
Hi, This is urgent. pls help me. I have got a scenario. There will be a button filled with a colour placed in the windows form, the colour of the button should change when we move the mouse and place that over the button.(the changes should happen only when moving the mouse and placing over the button and not by clicking the button)I am told that it can be done in two ways either by writing a code or by making some changes in the properties. So could u pls help in both the ways since I am new to this. pls give me complete codings so that i can learn and try for different scenarios Thanks in advance
Shubham Saxena14y ago
thanx :)
Gaurav Gupta14y ago
Good Shubham. It helps those who don't create WPF application.

One of my friends asked me how to rotate an image to a particular angle, so I just thought of writing an article about it. The following is the step-by-step process of how to use builtin functions for rotating and flipping an image.

Step 1

Create a blank Windows Forms application, as in:

Step 2

Add a pictureBox from the toolbox and add a source image to it.

Now comes the real part, using Image.RotateFlip we can rotate the image by standard angles (90, 180 or 270 degrees) or flip the image horizontally or vertically.

The parameter of RotateFlip is System.Drawing.RotateFlipType, which specifies the type of rotation and flip to apply to the image.

e.g. : pictureBox1.Image.RotateFlip(RotateFlipType.Rotate180FlipNone);

The preceding code will rotate the image in a pictureBox1 by an angle of 180 degrees.

Step 3

Now back to our code, add the namespaces to use as:

using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

Step 4

We will make a function RotateImg with two arguments one is the Bitmap Image and the other is the float angle. The code snippet is as follows :

public static Bitmap RotateImg(Bitmap bmp, float angle)

{

int w = bmp.Width;

int h = bmp.Height;

Bitmap tempImg = new Bitmap(w, h);

Graphics g = Graphics.FromImage(tempImg);

g.DrawImageUnscaled(bmp, 1, 1);

g.Dispose();

GraphicsPath path = new GraphicsPath();

path.AddRectangle(new RectangleF(0f, 0f, w, h));

Matrix mtrx = new Matrix();

mtrx.Rotate(angle);

RectangleF rct = path.GetBounds(mtrx);

Bitmap newImg = new Bitmap(Convert.ToInt32(rct.Width), Convert.ToInt32(rct.Height));

g = Graphics.FromImage(newImg);

g.TranslateTransform(-rct.X, -rct.Y);

g.RotateTransform(angle);

g.InterpolationMode = InterpolationMode.HighQualityBilinear;

g.DrawImageUnscaled(tempImg, 0, 0);

g.Dispose();

tempImg.Dispose();

return newImg;

}

Step 5

Now we have a function which will rotate an image to an arbitrary angle, I'm adding my code now to the form_load event so that as soon as the form loads my code is executed.

Bitmap bitmap = (Bitmap)pictureBox1.Image;
pictureBox1.Image = (Image)(RotateImg(bitmap, 30.0f));

The preceding two lines of code will first convert the image in pictureBox1 to a Bitmap image and then it will call our function RotateImg to rotate the image 30 degrees (for example).

Here is the snapshot of the output window: