Pie chart sections all black iff one sections was once 100% (360 degrees)

[buchen]

Problem

If the chart once contains one section that takes up 100%, then after an update, pie slices will all be black.

To Reproduce

• Create a chart with one PieChartSectionData that represents 100 percent
• Then update the chart with multiple pie charts (say: two sections with each 50 percent)
• The color of the slices of the pie chart will be black

Version 0.66.0

Potential root cause

With change 68cf161f2623cedda2bf1b51bef758cf62beb812, the blendMode is set to BlendMode.srcOut on the _sectionPaint if there is a slice that takes up 100%. Later, if there are multiple slices, the drawSection is using the same _sectionPaint with the altered blendMode.

I can confirm that the following code fixes the problem:

 void drawSection(
    PieChartSectionData section,
    Path sectionPath,
    CanvasWrapper canvasWrapper,
  ) {
    _sectionPaint
      ..setColorOrGradient(
        section.color,
        section.gradient,
        sectionPath.getBounds(),
      )
      ..blendMode = BlendMode.srcOver       <==== set blend mode to srcOver
      ..style = PaintingStyle.fill;
    canvasWrapper.drawPath(sectionPath, _sectionPaint);
  }

[shaynec25]

same issue here

[tattuu]

same issue here

[imaNNeo]

Yes, it is related to the code that you mentioned. Thanks for your detailed issue.

The hotfix is landed on the main branch. Stay tuned for a hotfix

[imaNNeo]

Fixed in 0.66.1