JavaFX教程 - JavaFX气泡图

气泡图是一个双轴图表，为一系列数据点绘制气泡。

创建气泡图

要创建气泡图，我们创建BubbleChart类，定义水平和垂直轴，并使用添加一个或多个数据系列XYChart.Data类。

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//package bubblechartsample;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.BubbleChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.paint.Color;
import javafx.stage.Stage;


public class Main extends Application {

    @Override public void start(Stage stage) {
        stage.setTitle("Bubble Chart Sample");
        final NumberAxis xAxis = new NumberAxis(1, 53, 4);
        final NumberAxis yAxis = new NumberAxis(0, 80, 10);
        final BubbleChart<Number,Number> blc = 
            new BubbleChart<Number,Number>(xAxis,yAxis);
        xAxis.setLabel("Week");
        xAxis.setTickLabelFill(Color.CHOCOLATE);
        xAxis.setMinorTickCount(4);
       
        yAxis.setLabel("Product Budget");
        yAxis.setTickLabelFill(Color.CHOCOLATE);
        yAxis.setTickLabelGap(10);
        yAxis.setTickLabelFormatter(
            new NumberAxis.DefaultFormatter(yAxis,"$ ",null)
        );
                              
        blc.setTitle("Budget Monitoring");
        
        XYChart.Series series1 = new XYChart.Series();
        series1.setName("Product 1");
        series1.getData().add(new XYChart.Data(3, 35, 2));
        series1.getData().add(new XYChart.Data(12, 60, 1.8));
        series1.getData().add(new XYChart.Data(15, 15, 7));
        series1.getData().add(new XYChart.Data(22, 30, 2.5));
        series1.getData().add(new XYChart.Data(28, 20, 1));
        series1.getData().add(new XYChart.Data(35, 41, 5.5));
        series1.getData().add(new XYChart.Data(42, 17, 9));
        series1.getData().add(new XYChart.Data(49, 30, 1.8));
                
        XYChart.Series series2 = new XYChart.Series();
        series2.setName("Product 2");
        series2.getData().add(new XYChart.Data(8, 15, 2));
        series2.getData().add(new XYChart.Data(13, 23, 1));
        series2.getData().add(new XYChart.Data(15, 45, 3));
        series2.getData().add(new XYChart.Data(24, 30, 4.5));
        series2.getData().add(new XYChart.Data(38, 78, 1));
        series2.getData().add(new XYChart.Data(40, 41, 7.5));
        series2.getData().add(new XYChart.Data(45, 57, 2));
        series2.getData().add(new XYChart.Data(47, 23, 3.8));
                       
        Scene scene  = new Scene(blc);
        blc.getData().addAll(series1, series2);     
        //scene.getStylesheets().add("bubblechartsample/Chart.css");
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

NumberAxis.DefaultFormatter类将向指定轴的标记添加前缀和后缀。

yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis,"$ ",null));

以下代码行指定了刻度标签的CHOCOLATE颜色。

xAxis.setTickLabelFill(Color.CHOCOLATE);
yAxis.setTickLabelFill(Color.CHOCOLATE);

上面的代码生成以下结果。

例子

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.BubbleChart;
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;

public class Main extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        NumberAxis xAxis = new NumberAxis();
        NumberAxis yAxis = new NumberAxis();
        xAxis.setAutoRanging(false);
        xAxis.setLowerBound(2011);
        xAxis.setUpperBound(2016);
        BubbleChart bubbleChart = new BubbleChart(xAxis, yAxis);
        bubbleChart.setData(getChartData());
        bubbleChart.setTitle("Title");
        primaryStage.setTitle("Chart example");

        StackPane root = new StackPane();
        root.getChildren().add(bubbleChart);
        primaryStage.setScene(new Scene(root, 400, 250));
        primaryStage.show();
    }

    private ObservableList<XYChart.Series<Integer, Double>> getChartData() {
        double aValue = 1.56;
        double bValue = 1.06;
        ObservableList<XYChart.Series<Integer, Double>> answer = FXCollections.observableArrayList();
        Series<Integer, Double> aSeries = new Series<Integer, Double>();
        Series<Integer, Double> bSeries = new Series<Integer, Double>();
        aSeries.setName("A");
        bSeries.setName("B");
        for (int i = 2011; i < 2016; i++) {
            double diff = Math.random();
            aSeries.getData().add(new XYChart.Data(i, aValue, diff));
            aValue = aValue + 10*diff - 5;
            diff = Math.random();
            bSeries.getData().add(new XYChart.Data(i, bValue, diff));
            bValue = bValue + 10*diff - 5;
            diff = Math.random();
        }
        answer.addAll(aSeries, bSeries);
        return answer;
    }
}

上面的代码生成以下结果。