The legend colors do not match the Pie chart colors

[ajay1685]

Bug report

Describe the bug
When using Charts.pieChart() the colors of the chart match the colors for that class of objects. However, the colors of the legend do not match!

To Reproduce
Steps to reproduce the behavior:

1. Run Positive cell detection on an image
2. Use the following code to create a pie chart:

    chartData = getDetectionObjects().countBy(p -> p.getPathClass())
    Charts.pieChart()
        .title('Test Chart')
        .data(chartData)
        .show()

Expected behavior
The colors of the legend shall match the colors of the pie.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• QuPath Version: Tested on v2.3 and the latest snapshot

Additional context
More details on the forum:
https://forum.image.sc/t/pie-chart-legend-colors/72051

[petebankhead]

Thanks @ajay1685 for reporting this!

[petebankhead]

Just adding for reference that this self-contained script shows the problem as well:

def chartData =
     [(getPathClass('Negative')): 5,
     (getPathClass('1+')): 2,
     (getPathClass('2+')): 3,
     (getPathClass('3+')): 4]
     
Charts.pieChart()
    .title('Test Chart')
    .data(chartData)
    .show()

[Also learned that non-string keys in Groovy need to be in (brackets)...]

[petebankhead]

This should be fixed now... along with a hidden bug that gave the wrong legend colors with pixel/object classifiers if more than 8 classes were used (which admittedly would probably not work well anyway).