New-WordCloud hangs in MyBinder (Dotnet Interactive)

[vexx32]

Currently the module is not usable in Jupyter Notebooks. Unsure as to exactly why this is at the moment.

No progress bars appear, so I can only assume it's hanging somewhere during text processing, possibly as a result of it spinning out different threads to handle text processing and waiting on them.

More investigation needed.

/cc @TylerLeonhardt

[vexx32]

After installing v3.0.1 and showing the debug messages, it looks like the cmdlet is hanging somewhere in this block of code:

PSWordCloud/Module/src/PSWordCloud/NewWordCloudCommand.cs

Lines 597 to 669 in b56c2b8

	WriteDebug($"Adding focus word '{FocusWord}' to the dictionary.");
	wordScaleDictionary[FocusWord] = highestWordFreq *= FOCUS_WORD_SCALE;
	}
	sortedWordList = new List<string>(SortWordList(wordScaleDictionary, MaxRenderedWords));
	try
	{
	if (MyInvocation.BoundParameters.ContainsKey(nameof(BackgroundImage)))
	{
	WriteDebug($"Importing background image from '{_backgroundFullPath}'.");
	backgroundImage = SKBitmap.Decode(_backgroundFullPath);
	drawableBounds = new SKRectI(0, 0, backgroundImage.Width, backgroundImage.Height);
	}
	else
	{
	drawableBounds = new SKRectI(0, 0, ImageSize.Width, ImageSize.Height);
	}
	wordPath = new SKPath();
	clipRegion = new SKRegion();
	clipRegion.SetRect(SKRectI.Round(drawableBounds));
	_fontScale = FontScale(
	clipRegion.Bounds,
	WordScale,
	wordScaleDictionary.Values.Average(),
	Math.Min(wordScaleDictionary.Count, MaxRenderedWords),
	Typeface);
	scaledWordSizes = new Dictionary<string, float>(
	sortedWordList.Count,
	StringComparer.OrdinalIgnoreCase);
	maxWordWidth = AllowRotation == WordOrientations.None
	? drawableBounds.Width * MAX_WORD_WIDTH_PERCENT
	: Math.Max(drawableBounds.Width, drawableBounds.Height) * MAX_WORD_WIDTH_PERCENT;
	using SKPaint brush = new SKPaint
	{
	Typeface = Typeface
	};
	SKRect rect = SKRect.Empty;
	float adjustedWordSize;
	bool retry;
	do
	{
	// Pre-test and adjust global scale based on the largest word.
	retry = false;
	adjustedWordSize = ScaleWordSize(
	wordScaleDictionary[sortedWordList[0]],
	_fontScale,
	wordScaleDictionary);
	brush.NextWord(adjustedWordSize, StrokeWidth);
	var textRect = brush.GetTextPath(sortedWordList[0], 0, 0).ComputeTightBounds();
	var adjustedTextWidth = textRect.Width * (1 + _paddingMultiplier) + StrokeWidth * 2 * STROKE_BASE_SCALE;
	if (adjustedTextWidth > maxWordWidth
	|| textRect.Width * textRect.Height < drawableBounds.Width * drawableBounds.Height * MAX_WORD_AREA_PERCENT)
	{
	retry = true;
	_fontScale *= 1.05f;
	}
	} while (retry);
	// Apply manual scaling from the user
	_fontScale *= WordScale;
	WriteDebug($"Global font scale: {_fontScale}");

(The first WriteDebug() call shows, the second is never reached.)

[vexx32]

I suspect the issue is the SKRegion object as allocating the memory for that is most likely to be the one that causes issues. However, SKRect has been a problem point in the past, so all bets are really off.

As far as I can tell, it seems like it's hanging somewhere on the native library calls used by SkiaSharp, and I don't know nearly enough to understand why.

I'm reasonably confident it's not something I can fix, but it's possible we might find a workaround sooner or later.

[TylerLeonhardt]

This seems to really just be the container... not Jupyter Notebooks specifically.