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Home » GDI+ & Graphics » Image Transformation in C# with GDI+

Image Transformation in C# with GDI+

Image transformation is exactly the same as any other transformation process. In this section we will see how to rotate, scale, translate, reflect, and shear images.

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Technologies: .NET 1.0/1.1, GDI+,Visual C# .NET
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Image transformation is exactly the same as any other transformation process. In this section we will see how to rotate, scale, translate, reflect, and shear images. We will create a Matrix object, set the transformation process by calling its methods, set the Matrix object as the Transform property or the transformation methods of the Graphics object, and call DrawImage.

Rotating images is similar to rotating other graphics. Listing 10.16 rotates an image. We create a Graphics object using the CreateGraphics method. Then we create a Bitmap object from a file and call the DrawImage method, which draws the image on the form. After that we create a Matrix object, call its Rotate method, rotate the image by 30 degrees, and apply the resulting matrix to the surface using the Transform property. Finally, we draw the image again using DrawImage.

Listing 10.16: Rotating images

private void RotationMenu_Click(object sender, System.EventArgs e)
{
Graphics g =
this
.CreateGraphics();
g.Clear(
this
.BackColor);
Bitmap curBitmap =
new
Bitmap(@"roses.jpg");
g.DrawImage(curBitmap, 0, 0, 200, 200);
// Create a Matrix object, call its Rotate method,
// and set it as Graphics.Transform
Matrix X = new
Matrix();
X.Rotate(30);
g.Transform = X;
// Draw image
g.DrawImage(curBitmap,
new
Rectangle(205, 0, 200, 200),
0, 0, curBitmap.Width,
curBitmap.Height,
GraphicsUnit.Pixel) ;
// Dispose of objects
curBitmap.Dispose();
g.Dispose();
}

Figure 10.17 shows the output from Listing 10.16. The first image is the original; the second image is rotated.

Now let's apply other transformations. Replacing the Rotate method in Listing 10.16 with the following line scales the image:

X.Scale(2, 1, MatrixOrder.Append);

The scaled image is shown in Figure 10.18.

Replacing the Rotate method in Listing 10.16 with the following line translates the image with 100 offset in the x- and y-directions:

X.Translate(100, 100);

The new output is shown in Figure 10.19.



Replacing the Rotate method in Listing 10.16 with the following line shears the image:

X.Shear(2, 1);

The new output is shown in Figure 10.20.

You have probably noticed that image transformation is really no different from the transformation of other graphics objects. I recommend that you download the source code samples from the book's Web site to see the detailed code listings.

This articles is taken from Chapter 10 "Transformations" of
Graphics Programming with GDI+.


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Mahesh Chand
Mahesh is a software developer with over 13 years of experience building systems for Financial and Banking, Engineering & Architectural, Imaging, Construction, Biological & Pharmaceuticals, Healthcare and Education industries. His expertise is Windows Forms, ASP.NET, Silverlight, WPF, WCF, Visual Studio 2010, SQL Server, and Oracle. If you are looking for a Windows Forms, ASP.NET, WPF, Silverlight, C#, VB.NET, Oracle, and SQL Server Consultant in Philadelphia area or remote location, drop me a line at MAHESH [AT] C-SHARPCORNER [DOT] COM.
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 Comments
Transform image to trapeze by Eric On March 22, 2006

Hi,

 

I am developping a control in which I must transform an image.

I want my image to take trapezoid's form (not parallelogram).

Do you have a solution to suggest me?

like that:

 

Reply | Email | Delete | Modify | 
Transform image to trapeze by Eric On March 22, 2006

Hi,

 

I am developping a control in which I must transform an image.

I want my image to take trapezoid's form (not parallelogram).

Do you have a solution to suggest me?

like that:

 

Reply | Email | Delete | Modify | 
Transform image to trapeze by Eric On March 22, 2006

Hi,

 

I am developping a control in which I must transform an image.

I want my image to take trapezoid's form (not parallelogram).

Do you have a solution to suggest me?

like that:

               

Reply | Email | Delete | Modify | 
Transform image to trapezoid by Eric On March 22, 2006

Hi,

I am developping a control in which I must transform an image.

I want my image to take the trapezoid form (not parallelogram).

Do you have a solution to suggest me?

 

Thanks.

 

Regards

Reply | Email | Delete | Modify | 
Re: Transform image to trapezoid by Rany On February 13, 2008

Hi Eric,

I have encountered a similar problem where I need to transform an image to take the form of a trapeze.  If you've found a solution for this, I'd appreciate it if you could post or send it to me.

Thanks,

Rany

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image clustering by fathima On February 2, 2009
Hi, i am doing my final year project in image processing. Can u help me, how to cluster the input image. Thanking you.
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Re: image clustering by Mahesh On April 6, 2009
Please post your questions on C# Corner forums.
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hi by Robert On November 3, 2009
Improve ur code to repaint the image, because now image disappears on minimize or when losing focus.
Reply | Email | Delete | Modify | 
Re: hi by Mahesh On November 4, 2009
On your Form's paint event handler, just call this code. That will make sure the form is repainted.
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