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oxyplot / oxyplot-xamarin

OxyPlot for Xamarin.Mac and Xamarin.Forms
MIT License
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PdfExporter not supported Cyrillic #123

Open vitalii-vov opened 2 years ago

vitalii-vov commented 2 years ago

Hello. I'm trying to generate a PDF document from a graph using the PdfExporter class.

var exporter = new PdfExporter { Width = width, Height = height, Background = background };
exporter.Export(model, stream);

One of the axes contains Cyrillic characters

var yAxis = new LinearAxis
{
    Position = AxisPosition.Left,
    Title = "FHR, уд/мин" // <- Cyrillic symbols
};

Garbage is displayed instead of characters in the document

Снимок экрана 2022-05-04 в 16 53 56

I tried to solve this with the DefaultFont property, like here https://github.com/oxyplot/oxyplot/issues/955 But it doesn't seem to work for xamarin?

VisualMelon commented 2 years ago

Which PDF exporter are you using? The one in the core library has poor unicode support, and it is generally better to use the one provided in OxyPlot.SkiaSharp which is a more complete implementation.

vitalii-vov commented 2 years ago

I am using PdfRenderer included in OxyPlot.Xamarin.Forms

If we use OxyPlot.SkiaSharp.PdfRenderer we will get an error:

Type OxyPlot.Xamarin.iOS.CoreGraphicsRenderContext has invalid vtable method slot 7 with method OxyPlot.RenderContextBase:DrawLine (System.Collections.Generic.IList`1<OxyPlot.ScreenPoint>,OxyPlot.OxyColor,double,OxyPlot.EdgeRenderingMode,double[] ,OxyPlot.LineJoin)

This error occurs when the application starts, since the regular OxyPlot.Xamarin.Forms library is used to display graphs I tried to do this before, but because of this error, nothing worked for me.