how to change text in bar chart - flutter

Question

how to change text in bar chart
List<_SalesData> data = [
_SalesData(' 1', 3.1),
_SalesData(' 2', 3.23),
_SalesData(' 3', 3.39),
_SalesData(' 4', 2.90),
_SalesData(' 5', 3.80),
_SalesData(' 6', 3.11),
_SalesData(' 7', 3.81),
_SalesData(' 8', 0)
];
how do I change the text in the barchart because the widget doesn't have text to change.
I don't know where to change this because I'm new to using charts, maybe someone here knows how to change it.
Thank you.
Center(
child: SfCartesianChart(
primaryXAxis: CategoryAxis(),
// Chart title
title: ChartTitle(
text: 'IPK Mahasiswa',
textStyle: bold6,
),
tooltipBehavior: TooltipBehavior(enable: true),
series: <ChartSeries<_SalesData, String>>[
ColumnSeries(
color: primaryColor,
dataSource: data,
xValueMapper: (_SalesData sales, _) => sales.year,
yValueMapper: (_SalesData sales, _) => sales.sales,
dataLabelSettings: const DataLabelSettings(isVisible: true),
),
],
),
),

Answer 1

based on documentation: https://help.syncfusion.com/flutter/cartesian-charts/tooltip
you can customize the tooltip
_tooltipBehavior = TooltipBehavior(
enable: true,
// Formatting the tooltip text
// customize here as you need
format: 'point.y%'
);
there is some label format property:
X value - point.x
Y value - point.y
Bubble size - point.size
Name of the series - series.name <- maybe this is what you need
you can expolore more about it.
also you can use builder for custom widget : https://help.syncfusion.com/flutter/cartesian-charts/tooltip#tooltip-template
builder: (dynamic data, dynamic point, dynamic series,
int pointIndex, int seriesIndex) {
return Container(
child: Text(
'PointIndex : ${pointIndex.toString()}'
)
);