JavaFX Tutorial - Java BarChart .setCategoryGap (double value)

Syntax

BarChart.setCategoryGap(double value) has the following syntax.

public final void setCategoryGap(double value)

Example

In the following code shows how to use BarChart.setCategoryGap(double value) method.

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
/*from   ww w . ja v  a  2 s  . c o  m*/
public class Main extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        CategoryAxis xAxis = new CategoryAxis();
        NumberAxis yAxis = new NumberAxis();
        BarChart barChart = new BarChart(xAxis, yAxis,getChartData());
        barChart.setCategoryGap(0.2);
        barChart.setTitle("A");
        primaryStage.setTitle("BarChart example");

        StackPane root = new StackPane();
        root.getChildren().add(barChart);
        primaryStage.setScene(new Scene(root, 400, 250));
        primaryStage.show();
    }
    private ObservableList<XYChart.Series<String, Double>> getChartData() {
        double aValue = 17.56;
        double cValue = 17.06;
        ObservableList<XYChart.Series<String, Double>> answer = FXCollections.observableArrayList();
        Series<String, Double> aSeries = new Series<String, Double>();
        Series<String, Double> cSeries = new Series<String, Double>();
        aSeries.setName("a");
        cSeries.setName("C");
        
        for (int i = 2011; i < 2021; i++) {
            aSeries.getData().add(new XYChart.Data(Integer.toString(i), aValue));
            aValue = aValue + Math.random() - .5;
            cSeries.getData().add(new XYChart.Data(Integer.toString(i), cValue));
            cValue = cValue + Math.random() - .5;
        }
        answer.addAll(aSeries, cSeries);
        return answer;
    }
}