JavaFX StackedBarChart

In stacked bar charts, the values of the different groups are displayed on a rectangular bar in the form of a stack. This is mainly used to compare the values of the different groups according to its length plotted on the bar.

In the following image, the population of men and women in the different states, is compared. On the x-axis, the states plotted while, on the y-axis the population is plotted.

In JavaFX, the class javafx.scene.chart.StackedBarChart represents the stacked bar chart. We need to instantiate this class to generate a StackedBarChart node.

Properties

The class contains only one property which is described in the following table along with its setter method.

Property	Description	Setter Method
categoryGap	It is a double type property. It represents the gap between the categories of the bar.	setCategoryGap(double value)

Constructors

There are the three constructors in the class.

public StackedBarChart(AxisXaxis, AxisYaxis) :creates the new instance of stackedbarchart with the specified axis.
public StackedBarChart(AxisXaxis, AxisYaxis, ObservableList> data) :creates the new instance of stackedbarchart with the specified axis and data.
public StackedBarChart(AxisXaxis, AxisYaxis, ObservableList> data, double categoryGap) :creates the new instance of StackeBarChart with the specified axis, data and categorygap

Example

In the following example, we have shown the comparison between the popularity of two programming languages in each month of a year. The x-axis is a category axis while the y-axis is a number axis. On X-axis, we have plotted the months of a year while on the y-axis we have plotted the number of readers.

package application;
import javafx.application.Application;
import javafx.scene.Group;
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.stage.Stage;
public class StackedBarChartExample extends Application{
@Override
public void start(Stage primaryStage) throws Exception {
	// TODO Auto-generated method stub
	//Configuring xaxis and yaxis 
	CategoryAxis xaxis = new CategoryAxis();
	NumberAxis yaxis = new NumberAxis(1000,300000,1000);
	xaxis.setLabel("Months");
	yaxis.setLabel("Number of users");
	
	//Configuring StackedBarChart 
	StackedBarChart sb = new StackedBarChart(xaxis,yaxis);
	sb.setTitle("Popularity of Programming languages");
	
	//Configuring series for java
	XYChart.Series java = new XYChart.Series<>();
	java.setName("java");
	java.getData().add(new XYChart.Data<>("Jan",10000));
	java.getData().add(new XYChart.Data<>("Jan",130000));
	java.getData().add(new XYChart.Data<>("Feb",50000));
	java.getData().add(new XYChart.Data<>("Mar",60300));
	java.getData().add(new XYChart.Data<>("Apr",105600));
	java.getData().add(new XYChart.Data<>("May",50600));
	java.getData().add(new XYChart.Data<>("Jun",103000));
	java.getData().add(new XYChart.Data<>("Jul",104500));
	java.getData().add(new XYChart.Data<>("Aug",203000));
	java.getData().add(new XYChart.Data<>("Sep",103400));
	java.getData().add(new XYChart.Data<>("Oct",105600));
	java.getData().add(new XYChart.Data<>("Nov",102400));
	java.getData().add(new XYChart.Data<>("Dec",200000));
	
	//Adding series java to the stackedbarchart
	sb.getData().add(java);
	
	//Configuring series python 
	XYChart.Series python = new XYChart.Series<>();
	python.setName("python");
	python.getData().add(new XYChart.Data<>("Jan",50000));
	python.getData().add(new XYChart.Data<>("Jan",14300));
	python.getData().add(new XYChart.Data<>("Feb",50400));
	python.getData().add(new XYChart.Data<>("Mar",100500));
	python.getData().add(new XYChart.Data<>("Apr",104000));
	python.getData().add(new XYChart.Data<>("May",134000));
	python.getData().add(new XYChart.Data<>("Jun",60000));
	python.getData().add(new XYChart.Data<>("Jul",78000));
	python.getData().add(new XYChart.Data<>("Aug",89000));
	python.getData().add(new XYChart.Data<>("Sep",150000));
	python.getData().add(new XYChart.Data<>("Oct",120000));
	python.getData().add(new XYChart.Data<>("Nov",109450));
	python.getData().add(new XYChart.Data<>("Dec",50450));
	
	//adding python series to the stackedbarchart 
	sb.getData().add(python);
	
	//Configuring group and Scene 
	Group root = new Group();
	root.getChildren().add(sb);
	Scene scene = new Scene(root,600,400);
	primaryStage.setScene(scene);
	primaryStage.setTitle("StackedBarChart Example");
	primaryStage.show();		
}
public static void main(String[] args) {
	launch(args);
}
}