Issue with chart printing

[porterbe]

I have a requirement to output to a print document, which is working to a point with the following code:

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            Stream CO2PlotStream = new MemoryStream();
            tcCO2Plot.Export.Image.PNG.Save(CO2PlotStream);
            Image CO2PlotImage = Image.FromStream(CO2PlotStream);

This is then drawn on the print engine in the OnPrint event where Bounds is the calculated page bounds.

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            e.Graphics.DrawImage(Image, Bounds);

However, the image appears fuzzy - see the attached screenshot of the resultant document in PDF form.

Extract from Print call

PDF Report ScreenCap.png (87.78 KiB) Viewed 4194 times

Contrast with a clipboard copy to Word and PDF - The clipboard copy is generated with the following code

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            Chart.Export.Image.Metafile.CopyToClipboard();

And produces the following when PDFd (and screen cap'd)...

PDF Clipboard ScreenCap.png (55.87 KiB) Viewed 4169 times

Any suggestions as to how I can improve the printing to be more like the copy?

TIA Bernie

[Sandra]

Hello Bernie,

I think you can use different formats of Metafile, allowing you export higher quality images. You can do something as next:

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 private void button1_Click(object sender, EventArgs e)
        {
            tChart1.Export.Image.Metafile.EMFFormat = System.Drawing.Imaging.EmfType.EmfOnly;
            tChart1.Export.Image.Metafile.Save(@"teeChartEmfOnly.emf");


            tChart1.Export.Image.Metafile.EMFFormat = System.Drawing.Imaging.EmfType.EmfPlusDual;
            tChart1.Export.Image.Metafile.Save(@"teeChartEmfPlusDual.emf");

            tChart1.Export.Image.Metafile.EMFFormat = System.Drawing.Imaging.EmfType.EmfPlusOnly;
            tChart1.Export.Image.Metafile.Save(@"teeChartEmfPlusOnly.emf"); 
        }

Also, If you prefer use CopyToClipBoard() method, I recommend you use PNG format,so get a good results when do this. See next example:

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 private void InitializeChart()
        {
            Steema.TeeChart.Styles.ErrorBar series1 = new Steema.TeeChart.Styles.ErrorBar(tChart1.Chart);
            tChart1.Aspect.View3D = false;
            series1.FillSampleValues();
            series1.ColorEach = true;
            tChart1.Export.Image.PNG.CopyToClipboard();
        }

I hope will helps.

Thanks,

[porterbe]

Hi Sandra,

The clipboard copy is working fine - the issue is with the printed output. Now, I'm a bit of a newbie at printing in C#, but it seems to me that I need an Image object to pass to the Graphics.DrawImage method in the PrintDocument OnPrint event handler. I'm generating this image using the tcChart.Export.Image method into a memory stream, then creating an image object from that. Now, Graphics.DrawImage is scaling the image to fit the specified bounds, but that is not the root cause of the problem - using Graphics.DrawImageUnscaled generates this.

PDF Report ScreenCap Unscaled.png (93.15 KiB) Viewed 4145 times

As you can see, this is still blury although the font proportions are now better. I think I need to be able to control the size of the image I generate - is this possible? Or do you have a better way of getting something I can use with a Graphics object?

As usual, all suggestions appreciated!

Bernie

[Sandra]

Hello Bernie,

You could change size of image you would export, using properties Width and Height of Image as do in below code:

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            tChart1.Export.Image.PNG.Width = 200;
            tChart1.Export.Image.PNG.Height = 100;
            tChart1.Export.Image.PNG.CopyToClipboard();

I hope will helps.

Thanks,