In C#.NET, how can I anti-alias an image object.

jinksk1957 used Ask the Experts™
In C#.NET, how can I anti-alias an image object and copy it to the clipboard so that the target app (Word) recognizes the anti-aliasing of the lines?

I have a diagraming application that allows a user to create a polar grid diagram use to plot wind envelopes. I am using the Syncfusion Diagraming control for Windows Forms that allows you to export the diagram's content to an image object. However, there seems to be no way to preserve the anti-aliasing of the original diagram when the image object is sent through the Clipboard to Microsoft Word.

Am I doing something wrong or is this impossible? I have seen other software do this: Visio to Word,
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The only way I would think you could do this is if you can stream the image in a vector-based format.  The only one I think .NET supports out of the box is WMF.  Something like:

    bmp.Save(myStream, ImageFormat.Wmf);

Otherwise, if you can access the underlying Graphics object used to draw the chart to the image, you may be able to use:

   gfx.SmoothingMode = SmoothingMode.AntiAlias;

Otherwise, you just have to create the image in as large a resolution as you dare and let the target app treat it as it chooses.  If you try to display it in an area smaller than the image data, Word should resize it nicely enough.  If you try to display it in an area larger than the image data, it will start to look blocky.




    Your answer looks promising; however, I can't get directly at the underlying Graphics object of the Diagram control. They do provide two export (to memory) methods:

    ExportDiagramAsImage(bool respectBounds)
    ExportDiagramAsGraphics(Graphics gfx)

I can easily find the Clipboard.SetImage(Image image) method to copy as an image; however, there is no equivalent Clipboard.SetGraphics(Graphics gfx) method. Do I use Clipboard.SetDataObject() instead?
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I think (but am not too sure) that you are expected to create the Graphics object yourself, then use the ExportDiagramAsGraphics routine to draw it.  If that is the case, you may try (completely untested!):
using (Image img = new Bitmap(width, height)) // maybe a better constructor
using (Graphics g = Graphics.FromImage(img))  // maybe FromBitmap
    g.SmoothingMode = SmothingMode.AntiAlias;

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Otherwise, you are just going to have to use a significantly bigger width/height combo and let Word resize it down.  It will always look better sizing a large image down than a small image up.



Thanks jimbob! That works great. Now I've just got to figure out how to just get what I want from their Diagram control to copy and not the whole page. Thanks again for the help

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