JavaFX 散点图

散点图是一个双轴图表，将其数据作为一组点显示。每个点由X和Y值定义。

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
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();
        ScatterChart scatterChart = new ScatterChart(xAxis, yAxis);
        scatterChart.setData(getChartData());
        scatterChart.setTitle("speculations");
        primaryStage.setTitle("ScatteredChart example");
        StackPane root = new StackPane();
        root.getChildren().add(scatterChart);
        primaryStage.setScene(new Scene(root, 400, 250));
        primaryStage.show();
    }
    private ObservableList<XYChart.Series<String, Double>> getChartData() {
        double aValue = 1.56;
        double cValue = 1.06;
        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;
    }
}

添加系列

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.ScatterChart;
import javafx.scene.chart.XYChart;
import javafx.scene.control.Button;
import javafx.scene.effect.DropShadow;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
public class Main extends Application {
    @Override public void start(Stage stage) {
        stage.setTitle("Scatter Chart Sample");
        final NumberAxis xAxis = new NumberAxis(0, 10, 1);
        final NumberAxis yAxis = new NumberAxis(-100, 500, 100);        
        final ScatterChart<Number,Number> sc = new ScatterChart<Number,Number>(xAxis,yAxis);
        xAxis.setLabel("Age (years)");                
        yAxis.setLabel("Returns to date");
        sc.setTitle("Investment Overview");
        XYChart.Series series1 = new XYChart.Series();
        series1.setName("Option 1");
        series1.getData().add(new XYChart.Data(4.2, 193.2));
        series1.getData().add(new XYChart.Data(2.8, 33.6));
        series1.getData().add(new XYChart.Data(6.2, 24.8));
        sc.setPrefSize(500, 400);
        sc.getData().addAll(series1);
        Scene scene  = new Scene(new Group());
        final VBox vbox = new VBox();
        final HBox hbox = new HBox();
        final Button add = new Button("Add Series");
        add.setOnAction(new EventHandler<ActionEvent>() {
            @Override public void handle(ActionEvent e) {
                if (sc.getData() == null) 
                    sc.setData(FXCollections.<XYChart.Series<Number,
                               Number>>observableArrayList());
                ScatterChart.Series<Number, Number> series = 
                    new ScatterChart.Series<Number, Number>();
                series.setName("Option "+(sc.getData().size()+1));
                for (int i=0; i<100; i++) series.getData().add(
                    new ScatterChart.Data<Number, 
                    Number>(Math.random()*100, Math.random()*500));
                sc.getData().add(series);
            }
        });
        final Button remove = new Button("Remove Series");
        remove.setOnAction(new EventHandler<ActionEvent>() {
            @Override public void handle(ActionEvent e) {
                if (!sc.getData().isEmpty()) 
                    sc.getData().remove((int)(Math.random()*(sc.getData().size()-1)));
            }
        });
        final DropShadow shadow = new DropShadow();
        shadow.setOffsetX(2);
        shadow.setColor(Color.GREY);
        sc.setEffect(shadow);
        hbox.setSpacing(10);
        hbox.getChildren().addAll(add, remove);
        vbox.getChildren().addAll(sc, hbox);
        hbox.setPadding(new Insets(10, 10, 10, 50));
        ((Group)scene.getRoot()).getChildren().add(vbox);
        stage.setScene(scene);
        stage.show();
    }
    public static void main(String[] args) {
        launch(args);
    }
}