JavaFX PieChrt饼图

通常，饼图是一种图形或图表，其中圆圈的扇区用于表示整个信息的不同比例。扇形弧的角度根据扇形所代表的信息百分比而变化。

在下图中，显示了一个饼图，其扇形代表一个人在篮子里的水果数量。

1 PieChrt类的属性

2 PieChrt类的构造函数

该类包含下面给出的两个构造函数。

1. public PieChart() ：创建一个空 PieChart 的新实例。
2. public PieChart(ObservableList data)  ： 使用指定的数据切片创建饼图的新实例。

3 PieChrt类的例子1

package com.yiidian;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;


public class ChartTest extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        // TODO Auto-generated method stub
        //Instantiating the pie-chart class
        PieChart piechart = new PieChart();

    //setting the data of the pie chart.
        piechart.setData(getChartData());

        //Creating Layout
        StackPane root = new StackPane();

        //Adding pie-chart to the layout
        root.getChildren().add(piechart);

        //configuring scene
        Scene scene = new Scene(root,400,400);
        primaryStage.setScene(scene);
        primaryStage.setTitle("一点教程网：PieChart Example");
        primaryStage.show();

    }
    //creating getChartData method to set the chart data
    private ObservableList<PieChart.Data> getChartData() {
        ObservableList<PieChart.Data> list = FXCollections.observableArrayList();
        list.addAll(new PieChart.Data("yiidian", 90),
                new PieChart.Data("Others", 10));
        return list;
    }
}  

输出结果为：

4 PieChrt类的例子2

在下面的示例中，我们创建了一个饼图，显示了所有计算机编程语言的流行程度。

package com.yiidian;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Side;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class ChartTest extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        //Instantiating PieChart class
        PieChart piechart = new PieChart();

        //Setting pieChart data
        piechart.setData(getChartData());
        piechart.setLegendSide(Side.LEFT);
        piechart.setTitle("Computer Language Popularities");
        piechart.setClockwise(false);

        //Creating layout
        StackPane root = new StackPane();

        //Adding piechart to the layout
        root.getChildren().add(piechart);

        //Configuring Scene and stage object
        Scene scene = new Scene(root,800,600);
        primaryStage.setScene(scene);
        primaryStage.setTitle("一点教程网：PieChart Example");
        primaryStage.show();

    }

    //The method sets the data to the pie-chart.
    private ObservableList<PieChart.Data> getChartData() {
        ObservableList<PieChart.Data> list = FXCollections.observableArrayList();
        list.addAll(new PieChart.Data("JavaScript", 30.8),
                new PieChart.Data("Ruby", 11.8),
                new PieChart.Data("Java", 10.8),
                new PieChart.Data("Python", 11.6),
                new PieChart.Data("PHP", 7.2),
                new PieChart.Data("Objective-C", 10.7),
                new PieChart.Data("C", 5.2),
                    new PieChart.Data("C++", 4.3),
                        new PieChart.Data("Go",3.8),
                        new PieChart.Data("CSS", 3.8)
    );
        return list;
    }
}

输出结果为：