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Flutter, Firebase, and Syncfusion charts

The Syncfusion charts are perfect for an app I'm writing.  I was able to get the charts to work using static data and am now trying to hook it up to my Firebase backend.  I have a series of date and a numeric values stored in Firebase collection that I would like to plot as a syncfusion scatter plot.  I'm having a hard time figuring out how to convert my list of values to a ScatterSeries list.  Some sample code is below.  I use a stream to write data to the task object, but I can't figure out how to use the data in this object to populate _seriesDateLength.  

Thanks in advance for any help!!

class DateLength {
final Timestamp mydate;
final double mylength;

DateLength.fromMap(Map<dynamic, dynamic> map)
: assert(map['date'] != null),
assert(map['length'] != null),
mydate = map['date'],
mylength = map['length'];

String toString() => "Record<$mydate:$mylength>";

List<ScatterSeries<DateLength, DateTime>> _seriesDateLength;
List<ScatterSeries<DateLength, DateTime>> mydata;
_generateDateLength(mydata) {
_seriesDateLength = mydata;//List<ChartSeries<DateLength, Timestamp>>();

Widget _buildScatterBody(BuildContext context) {
//debugPrint("CatchesRecords=" + Firestore.instance.collection('catches').snapshots().length.toString());
return StreamBuilder<QuerySnapshot>(
stream: Firestore.instance.collection('catches').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return LinearProgressIndicator();
} else {
debugPrint("found records " + snapshot.data.documents.length.toString());
List<DateLength> task = snapshot.data.documents
.map((documentSnapshot) => DateLength.fromMap(documentSnapshot.data))
debugPrint("mapped records");
debugPrint("task.length.tostring:" + task.length.toString());

return _buildScatterChart(context, _seriesDateLength);

Widget _buildScatterChart(BuildContext context, List<ScatterSeries<DateLength, DateTime>> taskdata) {
mydata = taskdata;
debugPrint("mydata=" + mydata.toString());
//debugPrint("_seriesDateLength.length=" + _seriesDateLength.length.toString());
return Padding(
padding: EdgeInsets.all(8.0),
child: Container(
child: Center(
child: Column(
children: <Widget>[

'Sample Data',
style: TextStyle(fontSize: 24.0, fontWeight: FontWeight.bold),
height: 10.0,

plotAreaBorderWidth: 0,
title: ChartTitle(text: 'Firebase DateLength'),
legend: Legend(isVisible: true),
primaryXAxis: DateTimeAxis(
labelIntersectAction: AxisLabelIntersectAction.multipleRows,
majorGridLines: MajorGridLines(width: 0),
primaryYAxis: NumericAxis(
labelFormat: 'Length (in)',
axisLine: AxisLine(width: 0),
minorTickLines: MinorTickLines(size: 0)),
tooltipBehavior: TooltipBehavior(enable: true),
series: _seriesDateLength,

1 Reply

DD Dharanidharan Dharmasivam Syncfusion Team November 18, 2019 01:50 PM UTC

Hi Trevor. 
Greetings from Syncfusion. We have created a sample which fetches data from firebase, and we have bound those data to chart. Here we have created a column chart, and this can be modified based on your scenario. 
final CollectionReference fireData = Firestore.instance.collection('data'); 
Widget build(BuildContext context) { 
    return Scaffold( 
        body: StreamBuilder<void>( 
          stream: fireData.snapshots(), 
          builder: (BuildContext context, AsyncSnapshot snapshot) { 
            Widget widget; 
            if (snapshot.hasData) { 
              List<ChartData> chartData = <ChartData>[]; 
              for (int index = 0; index < snapshot.data.documents.length; index++) { 
                DocumentSnapshot documentSnapshot = 
               // here we are storing the data into a list which is used for chart’s data source 
              widget = Container( 
                  child: SfCartesianChart( 
                primaryXAxis: DateTimeAxis(), 
                series: <ChartSeries<ChartDatadynamic>>[ 
                      dataSource: chartData, 
                      xValueMapper: (ChartData data, _) => data.xValue, 
                      yValueMapper: (ChartData data, _) => data.yValue) 
            return widget; 
class ChartData { 
  ChartData({this.xValue, this.yValue}); 
  ChartData.fromMap(Map<Stringdynamic> dataMap) 
      : xValue = dataMap['x'], 
        yValue = dataMap['y']; 
  final Timestamp xValue; 
  final int yValue; 
And our data structure in firebase is like below. 
For your convenience we have attached the sample which can be found be below. 

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