Question

Circle Circumeference distorted

Asked by: sunny575

Hello,

         I am drawing a cirlce on square shape image(ASP.NET , C#). but the problem is the circle has little distortions. Is there any way I can get rid of this and draw perfect cirlce shape. Any clue why it is actually drawing like that? Please help

Thanks
Sunny

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Asked On
2009-10-22 at 08:21:50ID24834882
Tags

ASP.NET

,

C#

Topics

Microsoft Visual C#.Net

,

C# Programming Language

,

.NET

,

Programming for ASP.NET

,

Web Languages/Standards

Participating Experts
4
Points
250
Comments
13

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Answers

 

by: topdog770Posted on 2009-10-22 at 08:48:11ID: 25635589

What does your code look like, sunny?

 

by: sunny575Posted on 2009-10-22 at 15:07:16ID: 25639556

Hello topdog770,

Here is the code,  this crops the circular image from square but the circle is little bit distorted. Any help is appreciated

    System.Drawing.Image imgSource = System.Drawing.Image.FromFile(@"C:\Picture.JPG");
    System.Drawing.Image imgTarget = new Bitmap(imgSource.Height, imgSource.Height);
    Graphics g = Graphics.FromImage(imgTarget);
    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;        System.Drawing.Drawing2D.GraphicsPath path = new System.Drawing.Drawing2D.GraphicsPath();
    path.AddEllipse(0, 0, imgTarget.Height, imgTarget.Height);
    g.SetClip(path);
    g.DrawImage(imgSource, 0, 0);
    imgTarget.Save(@"C:\picture2.jpg", System.Drawing.Imaging.ImageFormat.MemoryBmp);

 

by: sunny575Posted on 2009-10-22 at 15:34:09ID: 25639756

I even added these line with more or less circle has some distortions

        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
        g.PixelOffsetMode = PixelOffsetMode.HighQuality;

 

by: DanRollinsPosted on 2009-10-24 at 13:04:30ID: 25654023

Describe what you mean by distortions.  Take a screen shot of the result and attach it.

 

by: sunny575Posted on 2009-10-24 at 13:51:42ID: 25654272

I am attaching the screen shot. if you look at the circumference circle it wasn't properly drawn

 

by: mlmccPosted on 2009-10-24 at 14:04:42ID: 25654356

I tlooks like what you will get.  Remember you don't have infinite precision so the computer has to simulate the curve with straight lines.

mlmcc

 

by: DanRollinsPosted on 2009-10-24 at 14:10:01ID: 25654379

That looks to me exactly how a circle must look when drawn on a matrix of discrete pixels.

Try drawing a similar-sized circle in MS-PAINT -- you will see the same "distortions."

 

by: sunny575Posted on 2009-10-24 at 14:16:59ID: 25654403

You are right DanRollins I tried drawing circle in MS paint same distortions. But do you think it will be possible to draw circle with out them. Or is it possible to invoke third party tool like photo shop with in C# to crop image. Any ideas would be appreciated


Thanks

 

by: DanRollinsPosted on 2009-10-24 at 18:24:42ID: 25655134

There is some example code here:

Antialiasing / Smoothing
http://www.geekpedia.com/tutorial52_Antialiasing-or-Smoothing.html

The picture of the circle looks somewhat better than yours, so there might be something you can do with that.

 

by: Arthur_WoodPosted on 2009-10-24 at 18:41:07ID: 25655168

No, It is not possible to draw what you would describe as a 'perfect' circle on a device which has a matrix of pixels.  The 'problem' is that when any part of the curved line that makes up the circle passes through any part of a pixel, the entire pixel is illuminated, not just the place where the curve passes.  This leads to what you see as 'distortions or rough edges.  It is not possible to only turn on part of a pixel - pixel means picture element - the smallest display element on the screen.  The only devices that can show a smooth curve are 'vector' devices, such as pen plotters.



 

by: DanRollinsPosted on 2009-10-24 at 19:12:20ID: 25655233

However, the "jaggie" look can be minimized by using (for instance) grey pixels at key locations.   The images at that link show a significant visual improvement.

20120131-EE-VQP-002

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