CODEWITHSUNDEEP
c#skiasharp
greenoldman
greenoldman

Reputation: 21082

Is it possible to draw object with outline and fill at the same time?

I would like to draw a polygon for example, or draw a text in such way that the color of the outline is different than the color of the fill ("content"). I found out the property ColorF inside SKPaint and I guessed all it takes is to change style to StrokeAndFill -- well, I wrong guess, I got single color. In the following example the single color is ColorF (with DrawText it is Color).

Visually I can achieve the desired effect using two passes, but I wonder if this is possible with one step.

Example of drawing and filling polygon:

        using (var sk_paint = new SKPaint
        {
            Style = SKPaintStyle.StrokeAndFill,
            Color = outline_color,
            ColorF = fill_color,
            IsAntialias = true,
            StrokeWidth = (float)thickness
        })
        {
            using (var path = new SKPath { FillType = SKPathFillType.EvenOdd })
            {
                path.MoveTo(points.First().x, points.First().y);
                foreach (var p in points.Skip(1))
                    path.LineTo(p.x, p.y);
                path.Close();
                canvas.DrawPath(path, sk_paint);
            }
        }

As for lines I found it (RTFM ;-)) https://learn.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/curves/effects#path-outlining I wonder if ColorF is not some sort of leftover. Anyway, I am still interested in drawing text with outline.

Upvotes: 0

Views: 712

Answers (1)

Maku
Maku

Reputation: 1558

The answer is: you can't. Both color properties (Color and ColorF) of SKPaint set the same SKColorF value internally (Color being converted into ColorF). The 'F' in ColorF indicates the RGBA values are stored as floats instead of bytes.

Upvotes: 3

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