Generate Dynamic StackedBarChart - javafx

Question

I want to create dynamic StackedBarChart from Java Object. I tried this code:
Java Object:
public class EventsObj
{
private String date;
private int info;
private int error;
private int warning;
private int critical;
public EventsObj()
{
}
public EventsObj(String date, int info, int error, int warning, int critical)
{
this.date = date;
this.info = info;
this.error = error;
this.warning = warning;
this.critical = critical;
}
public String getDate()
{
return date;
}
public void setDate(String date)
{
this.date = date;
}
public int getInfo()
{
return info;
}
public void setInfo(int info)
{
this.info = info;
}
public int getError()
{
return error;
}
public void setError(int error)
{
this.error = error;
}
public int getWarning()
{
return warning;
}
public void setWarning(int warning)
{
this.warning = warning;
}
public int getCritical()
{
return critical;
}
public void setCritical(int critical)
{
this.critical = critical;
}
}
Java code:
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.StackedBarChart;
import javafx.scene.chart.XYChart;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class MainApp extends Application
{
private StackedBarChart<String, Number> stackedChart;
private List<EventsObj> eventsObj;
#Override
public void start(Stage stage) throws Exception
{
createStackedChart();
List<EventsObj> testData = generateTestData();
addStackedChartData(testData);
HBox hb = new HBox(20);
hb.setPadding(new Insets(10, 20, 20, 40));
hb.getChildren().add(stackedChart);
Scene scene = new Scene(hb);
stage.setTitle("JavaFX and Maven");
stage.setScene(scene);
stage.show();
}
public static void main(String[] args)
{
launch(args);
}
private void createStackedChart()
{
CategoryAxis xAxis = new CategoryAxis();
xAxis.setLabel("Days");
NumberAxis yAxis = new NumberAxis();
stackedChart = new StackedBarChart<>(xAxis, yAxis);
stackedChart.setCategoryGap(20);
stackedChart.setMinSize(500, 400);
stackedChart.setMaxSize(500, 400);
}
private List<EventsObj> generateTestData()
{
eventsObj = new ArrayList<>();
for (int i = 0; i < 20; i++)
{
eventsObj.add(new EventsObj(String.valueOf(randomDate()), random(2, 60), random(2, 60), random(2, 60), random(2, 60)));
}
return eventsObj;
}
public static int random(int lowerBound, int upperBound)
{
return (lowerBound + (int) Math.round(Math.random() * (upperBound - lowerBound)));
}
private LocalDate randomDate()
{
Random random = new Random();
int minDay = (int) LocalDate.of(1900, 1, 1).toEpochDay();
int maxDay = (int) LocalDate.of(2015, 1, 1).toEpochDay();
long randomDay = minDay + random.nextInt(maxDay - minDay);
LocalDate randomBirthDate = LocalDate.ofEpochDay(randomDay);
return randomBirthDate;
}
private void addStackedChartData(List<EventsObj> data)
{
ObservableList<XYChart.Series<String, Number>> observableArrayList = FXCollections.observableArrayList();
ObservableList<XYChart.Series<String, Number>> observabt = FXCollections.observableArrayList();
for (EventsObj data1 : data)
{
final XYChart.Series<String, Number> series1 = new XYChart.Series<>();
EventsObj get = data1;
series1.setName(get.getDate());
series1.getData().add(new XYChart.Data<>(get.getDate(), get.getInfo()));
series1.getData().add(new XYChart.Data<>(get.getDate(), get.getWarning()));
series1.getData().add(new XYChart.Data<>(get.getDate(), get.getCritical()));
series1.getData().add(new XYChart.Data<>(get.getDate(), get.getError()));
observabt.addAll(series1);
}
stackedChart.getData().addAll(observabt);
}
}
I need to generate a StackedBarChart that contains one bar for every day that contains different parts for the event types Info, Warning, Critical and Error. But for some reason I can't get it right. It should be something like this:
Countries should be replaced by dates and years should be replaced by event types.
Can you help me fix the code?

Answer 1

You want to create a chart that has one column per date and each column should contain parts Info, Warning, Error and Critical. To do this you need to create a different series for each event type. However you use date as series name and column name. You need to change this:
private static XYChart.Series<String, Number> createSeries(String name) {
XYChart.Series<String, Number> series = new XYChart.Series<>();
series.setName(name);
return series;
}
private void addStackedChartData(List<EventsObj> data) {
XYChart.Series<String, Number> infoSeries = createSeries("Info");
XYChart.Series<String, Number> warningSeries = createSeries("Warning");
XYChart.Series<String, Number> criticalSeries = createSeries("Critical");
XYChart.Series<String, Number> errorSeries = createSeries("Error");
for (EventsObj data1 : data) {
String date = data1.getDate();
infoSeries.getData().add(new XYChart.Data<>(date, data1.getInfo()));
warningSeries.getData().add(new XYChart.Data<>(date, data1.getWarning()));
errorSeries.getData().add(new XYChart.Data<>(date, data1.getError()));
criticalSeries.getData().add(new XYChart.Data<>(date, data1.getCritical()));
}
stackedChart.getData().setAll(errorSeries, warningSeries, infoSeries, criticalSeries);
}
The series has to be used this way:
series.setName(<Color Key>);
series.getData().add(new XYChart.Data<>(<Column>, <Bar Size>));