export pdf Chinese garbled

[flypigeon]

Platform:
.NET version:4.0 wpf

Expected behaviour

Actual behaviour

As shown below

using (var stream =new FileStream(path,FileMode.Create)) { var pdfExporter = new PdfExporter() { Width =width Height = height}; pdfExporter.Export(this.plot.Model, stream); OpenContainingFolder(path); } }

[objorke]

Does this happen on all plots? Can you attach a pdf file?
Is this the pdf exporter in the core library, or the one based on PdfSharp?
The core pdf exporter has some limitations, see #85

[flypigeon]

Thank you for your reply ! I use the pdf exporter of the core library .
png export is correct ,but pdf is error.

1.pdf

[objorke]

I checked the .pdf files generated by the tests - they seem to be ok:
BarSeries - Simple model.pdf

Please include code to reproduce the issue.

[rexfie]

Pls try it once in Chinese.@objorke ,For example, set the PlotModel.Title in Chinese,The problem still exists.

[VisualMelon]

@rexfie Is this with an OxyPlot.Pdf.PdfExporter or an OxyPlot.PdfExporter? The former supports Unicode, the later does not (at least that's been my experience using the former with .NET Framework and the later with .NET Core).

[rexfie]

@VisualMelon thx, I used the later one with .NET 4.0. Could you give me some examples with an OxyPlot.Pdf.PdfExporter

[VisualMelon]

@rexfie it's basically the same interface; just you need OxyPlot.Pdf.dll and its dependencies. It's .NET Framework only because PdfSharp.dll requires System.Drawing. There are efforts to port PdfSharp to .NET Standard with ImageSharp replacing the GDI+.

OxyPlot.Pdf.PdfExporter exporter = new OxyPlot.Pdf.PdfExporter();
using (var fs = new System.IO.FileStream(ofname, System.IO.FileMode.OpenOrCreate))
{
    exporter.Export(model, fs);
}

[rexfie]

@VisualMelon thanks again ，but it still doesn't work
I used the following fonts

The PdfExporter Code:

UI Display

Result(OxyPlot.PdfExporter)

Result(OxyPlot.Pdf.PdfExporter)

[VisualMelon]

I have now reproduced this. I can get Chinese characters (or at least a subset; not all 'European' characters remain working) working by using the 'simhei' font.

I know very little about PDF, but apparently 'CJK' characters are recognised concept wherewith PDFSharp doesn't get along well. (Some documentation on PDFSharp Unicode support). I don't see any such CJK characters in the OxyPlot.Pdf tests.

(copyable example code)

OxyPlot.PlotModel model = new OxyPlot.PlotModel();
model.Title = "包公案abcöüä";
model.TitleFont = "simhei";

OxyPlot.Pdf.PdfExporter exporter = new OxyPlot.Pdf.PdfExporter();
exporter.Width = 297 / 25.4 * 72;
exporter.Height = 210 / 25.4 * 72;

using (var fs = System.IO.File.OpenWrite("text包公案.pdf"))
{
    exporter.Export(model, fs);
}

[rexfie]

There are two ways to display Chinese,You need to modify the source code
1.

2.Let FontsizeFactor=1f

We can use a font like "FangSong" to print Chinese