I am using the syncfusion library for Flutter and I can build a line chart when I have data. However, if the list is empty, it simply draws axes and that is all. Even though this is expected, I want to write a "No Data" message in the center of the chart.
Here is my chart widget:
SfCartesianChart(
margin: EdgeInsets.all(0),
borderWidth: 0,
plotAreaBorderWidth: 0,
title: ChartTitle(text: 'Mood Tracks', textStyle: TextStyle(fontWeight: FontWeight.bold)),
tooltipBehavior: _tooltipBehavior,
series: <ChartSeries>[
LineSeries<MoodRecord, dynamic>(
name: 'Moods',
color: Colors.green[400],
dataSource: [],
xValueMapper: (MoodRecord record, _) => record.date,
yValueMapper: (MoodRecord record, _) => record.mood.toInt(),
dataLabelSettings: DataLabelSettings(isVisible: true),
enableTooltip: true)
],
primaryXAxis: CategoryAxis(
labelPlacement: LabelPlacement.onTicks,
labelStyle: TextStyle(fontWeight: FontWeight.bold)
),
primaryYAxis: NumericAxis(
labelFormat: '{value}%',
labelStyle: TextStyle(fontWeight: FontWeight.bold)
),
),
Is there any way to show such message?
We have looked through the question and like to tell you that we can meet the requirement by using the chart's annotations property. We can position the Text Widget with ‘No Data' if the data source is empty, otherwise, we can allocate the empty container to the annotations. Using these annotations, we can place the necessary widget in the required position in the map, and for more detail, see the support document and we have attached the sample as a reference.
Sample: https://www.syncfusion.com/downloads/support/directtrac/326033/ze/I326033_no_data_text48946494
Related
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),
),
],
),
),
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()}'
)
);
Syncfuction Hilo Series has high and low values and it automatically shows values as high and low label names. I want to change these label names to another language. Here is part of code of my work and how it looks like tooltip.
SfCartesianChart(
title: ChartTitle(
text: 'En düşük ve en yüksek oranlar',
alignment: ChartAlignment.near,
textStyle: TextStyle(
color: blueLogo,
fontSize: 12.sp,
)),
legend: Legend(
isVisible: true,
position: LegendPosition.top,
overflowMode: LegendItemOverflowMode.wrap),
tooltipBehavior: TooltipBehavior(enable: true),
primaryXAxis: CategoryAxis(
labelIntersectAction:
AxisLabelIntersectAction.multipleRows),
primaryYAxis: NumericAxis(maximum: 150, plotBands: [
PlotBand(
start: 80,
end: 80,
borderColor: Colors.red,
borderWidth: 1,
),
PlotBand(
start: 120,
end: 120,
borderColor: Colors.red,
borderWidth: 1,
)
]),
series: <ChartSeries>[
HiloSeries<ChartData, String>(
markerSettings: const MarkerSettings(isVisible: true),
name: 'Oranlar',
enableTooltip: true,
dataSource: chartData,
xValueMapper: (ChartData data, _) => data.unit,
lowValueMapper: (ChartData data, _) => data.low,
highValueMapper: (ChartData data, _) => data.high)
])
Output of this code sample
How can I change these high and low label names?
You can change the TooltipBehaviour of the chart and construct the tooltip widget yourself. Official syncfusion documentation is here.
how to flutter syncfusion bar chart background grid line delete?
use pub.dev // syncfusion_flutter_charts 19.4.56
https://pub.dev/packages/syncfusion_flutter_charts
< image grid line (grey color line) >
my code
return SfCartesianChart(
title: ChartTitle(text: totalTaxString, textStyle: const TextStyle(fontWeight: FontWeight.bold)),
primaryXAxis: CategoryAxis(
maximumLabelWidth: MediaQuery.of(context).size.width > 480 ? MediaQuery.of(context).size.width * 0.3 : 100,
labelStyle: const TextStyle(overflow: TextOverflow.ellipsis)
// isVisible: false
),
primaryYAxis: CategoryAxis(
isVisible: false
),
series: <BarSeries>[
BarSeries<ModelPioChartData, String>(
dataSource: listPioChartData,
pointColorMapper:(ModelPioChartData data, _) => data.color,
xValueMapper: (ModelPioChartData data, _) => data.x,
yValueMapper: (ModelPioChartData data, _) => data.y,
dataLabelMapper: (ModelPioChartData data, _) {
if(data.y.toStringAsFixed(0).length > 4) {
return "${data.y/10000}조 원";
} else {
return "${data.y.toStringAsFixed(0)}억 원";
}
},
dataLabelSettings: const DataLabelSettings(
isVisible: true
),
enableTooltip: true,
),
],
);
I suggest you use the majorGridLines property in the axis, you can customize the width, color, and size of the major grid line. We have attached the code snippet and UG below for your reference.
primaryXAxis:
CategoryAxis(
majorGridLines: const MajorGridLines(width: 0)
),
UG: https://help.syncfusion.com/flutter/cartesian-charts/axis-customization#grid-lines-customization
I have a SfCartesianChart which displays a line chart of a list of values from 0 to 100, i.e. percentages. However, when there is a data point, for example, 99%, the upper limit of the y-axis seems like 120% which does not mean anything.
Here is my chart code
SfCartesianChart(
margin: EdgeInsets.all(0),
borderWidth: 0,
plotAreaBorderWidth: 0,
title: ChartTitle(text: 'Mood Tracks', textStyle: TextStyle(fontWeight: FontWeight.bold)),
tooltipBehavior: _tooltipBehavior,
series: <ChartSeries>[
LineSeries<MoodRecord, dynamic>(
name: 'Moods',
color: Colors.green[400],
dataSource: records,
xValueMapper: (MoodRecord record, _) => record.date,
yValueMapper: (MoodRecord record, _) => record.mood.toInt(),
dataLabelSettings: DataLabelSettings(isVisible: false),
enableTooltip: true,
animationDuration: 2000,
markerSettings: MarkerSettings(
isVisible: true,
shape: DataMarkerType.circle,
color: kPrimaryColor
)
)
],
primaryXAxis: CategoryAxis(
labelPlacement: LabelPlacement.onTicks,
labelStyle: TextStyle(fontWeight: FontWeight.bold)
),
primaryYAxis: NumericAxis(
labelFormat: '{value}%',
labelStyle: TextStyle(fontWeight: FontWeight.bold)
),
),
Is there any way to define an upper limit on the y-axis? I do not want my chart to display something like 120% on the y-axis.
If there any better way to display percentages, it would also be appreciated.
We have looked over the question and code and can inform you that the axis range is determined by the data source values. If you don't want values above 100 to be shown, use the maximum property in the axis and manually customize the range. For more details, see the help document. You may also use the numberFormat property to reflect percentage values, as seen in the example below.
https://www.syncfusion.com/kb/11519/how-to-apply-the-currency-format-to-the-axis-labels-sfcartesianchart
For 100 percent stacked charts, refer to the support document, which converts the given data to 100 percent.
SfCartesianChart(
primaryXAxis: CategoryAxis(labelStyle: const TextStyle(
color: Colors.white,
fontFamily: 'Roboto',
fontSize: 10,
)),
primaryYAxis: NumericAxis(
**minimum: 0, maximum: 100, interval: 25,**
labelFormat: '{value}%',
labelStyle: const TextStyle(
color: Colors.white,
fontFamily: 'Roboto',
fontSize: 10,
)),
I am using SfCalender and want to pass one more parameter to a callBack of onTap
SfCalendar(
dataSource: _getDataSource(snapshot.data.data),
view: CalendarView.month,
showNavigationArrow: true,
monthViewSettings: MonthViewSettings(
showAgenda: true,
agendaStyle: AgendaStyle(
backgroundColor: Colors.transparent,
appointmentTextStyle: TextStyle(
color: Colors.white, fontSize: 13, fontStyle: FontStyle.italic),
dateTextStyle: TextStyle(
color: primaryColor, fontSize: 13, fontStyle: FontStyle.italic),
),
),
controller: _calendarController,
onTap: _openForm(array),
)
_openForm(CalendarTapDetails details) {
//code
}
Currently if I dont pass any argument to _openForm, CalenderDetails details have the values but I want to pass one array along with CalenderDetails details. How can I do that?
I don't know the SfCalendar library (and it is closed source), but I think you are trying to do that:
onTap: (details) => _openForm(details, array);
// ...
_openForm(CalendarTapDetails details, List myArray) {
// code
}