Single point line not visible

[DennisNurtio]

Describe the bug
A line chart with only one point will not show anything. I would expect at least a dot that shows a data point is added to the chart.

Scenario: our customer is setting up sensors. After setup the chart is shown (with a hourly interval) so the first point shows after/while installing. The next point would be visible after an hour. Currently the customer does not see any data in the first hour, and might wonder why the setup failed.

To Reproduce
The following code shows as an empty chart (while there is a data point available).

@override
  Widget build(BuildContext context) {
    return LineChart(
      LineChartData(
        lineBarsData: [
          LineChartBarData(
            color: AppColors.contentColorGreen,
            barWidth: 8,
            isStrokeCapRound: true,
            dotData: const FlDotData(show: false),
            belowBarData: BarAreaData(show: false),
            spots: const [
              FlSpot(1, 1),
            ],
          ),
        ],
        minX: 0,
        maxX: 14,
        maxY: 4,
        minY: 0,
      ),
      duration: const Duration(milliseconds: 250),
    );
  }

Screenshots

Versions

• which version of the Flutter are you using? 3.13.1
• which version of the FlChart are you using? 0.63.0

[FMorschel]

In this case, you could do dotData: const FlDotData(show: true) I believe. Tested here and it works just fine. Would this be a problem for you? If so, why?

[DennisNurtio]

Hello @FMorschel , thanks for the tip. Currently we dont show the dots, because it does not match the styling. For this specific case I will show it, as a good workaround.
dotData: const FlDotData(show: spots.length == 1)

[imaNNeo]

In the new versions, it shows. Can you please verify that?

[DennisNurtio]

I don't see a change using 0.64 and the code from the first post.

[imaNNeo]

@DennisNurtio Can you please provide a reproducible code?

[DennisNurtio]

Pasted the original code above into line 12 of lib\presentation\samples\line\line_chart_sample1.dart on commit e3910de.
Same effect as the original post.

[imaNNeo]

I found the bug, thank you!

[imaNNeo]

Landed in 0.65.0
Check it out!