.NET MAUI: Why do I get an "Invalid color" error when drawing a pattern using the GraphicsView?

Question

Only when drawing a pattern, I get the following error in the console:

"Invalid color: colored pattern specified with uncolored pattern color space."

The drawn pattern looks fine, despite the error.

After setting up the pattern to draw, the error appears when calling canvas.FillCircle() or canvas.FillRoundedRectangle().

The problem may be with the way I set up the pattern, but the error message does not give me enough information to go by.

Here is a simplified version of the pattern prep followed by the call to canvas.FillCircle():

            IPattern thePattern;
            PatternPaint thePaint;
		
            using (PictureCanvas picture = new PictureCanvas(0, 0, 8, 8))
            {
                picture.StrokeSize = 1;
                picture.StrokeColor = Colors.Black;
                // Hatch pattern
                picture.DrawLine(0, 8, 8, 0);
                thePattern = new PicturePattern(picture.Picture, 8, 8);
	            thePaint = new PatternPaint
                {
                    Pattern = thePattern
                };
            }
            canvas.SetFillPaint(thePaint, RectF.Zero);
            canvas.FillCircle(objRect.Center, theRadius);

I can give more details, if necessary.

Thank you.

Answer 1

Hello,

I can get this [unknow process name]"Invalid color: colored pattern specified with uncolored pattern color space." from Application Output window.

I find this above error only occurs in iOS platform. Android and windows platform do not have this error in output window.

If you comment out canvas.SetFillPaint(thePaint, RectF.Zero);, then use canvas.FillCircle(objRect.Center, objRect.Width / 2); directly, this error will disappear. There are some conflicts between SetFillPaint and FillCircle.

I check the source code about the SetFillPaint and FillCircle, I cannot find related error information.

Please report this issue in the MAUI GitHub repo.

Best Regards,

Leon Lu

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