表示圆圈中的数据的图表，每个切片表示百分比。

import javafx.application.Application;import javafx.collections.FXCollections;import javafx.collections.ObservableList;import javafx.scene.Scene;import javafx.scene.chart.PieChart;import javafx.scene.chart.PieChart.Data;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) { PieChart pieChart = new PieChart(); pieChart.setData(getChartData()); primaryStage.setTitle("PieChart"); StackPane root = new StackPane(); root.getChildren().add(pieChart); primaryStage.setScene(new Scene(root, 400, 250)); primaryStage.show(); } private ObservableList<Data> getChartData() { ObservableList<Data> answer = FXCollections.observableArrayList(); answer.addAll(new PieChart.Data("java", 17.56), new PieChart.Data("JavaFx", 31.37)); return answer; }}

上面的代码生成以下结果。

创建饼图

要创建饼图，我们需要PieChart类。

饼图数据包裹在PieChart.Data对象中。

每个PieChart.Data对象有两个字段:饼图扇区的名称及其对应的值。

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.chart.PieChart.Data;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) { PieChart pieChart = new PieChart(); pieChart.setData(getChartData()); pieChart.setTitle("Title"); pieChart.setLegendSide(Side.LEFT); pieChart.setClockwise(false); pieChart.setLabelsVisible(false);  StackPane root = new StackPane(); root.getChildren().add(pieChart); primaryStage.setScene(new Scene(root, 300, 250)); primaryStage.show(); } private ObservableList<Data> getChartData() { ObservableList<Data> answer = FXCollections.observableArrayList(); answer.addAll(new PieChart.Data("java", 17), new PieChart.Data("JavaFx",31), new PieChart.Data("Swing",10), new PieChart.Data("IO",20), new PieChart.Data("NIO",21) ); return answer; }  }

上面的代码生成以下结果。

处理饼图的事件

以下代码创建一个EventHandler对象来处理落入特定图表切片的MOUSE_PRESSED事件。

/* * Copyright (c) 2011, 2012 Oracle and/or its affiliates. * All rights reserved. Use is subject to license terms. * * This file is available and licensed under the following license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * - Neither the name of Oracle nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *///package piechartsample;import javafx.application.Application;import javafx.collections.FXCollections;import javafx.collections.ObservableList;import javafx.event.EventHandler;import javafx.scene.Scene;import javafx.scene.paint.Color;import javafx.stage.Stage;import javafx.scene.chart.*;import javafx.scene.Group;import javafx.scene.control.Label;import javafx.scene.input.MouseEvent;public class Main extends Application { @Override public void start(Stage stage) { Scene scene = new Scene(new Group()); stage.setTitle("Imported Fruits"); stage.setWidth(500); stage.setHeight(500); ObservableList<PieChart.Data> pieChartData = FXCollections.observableArrayList( new PieChart.Data("Grapefruit", 13), new PieChart.Data("Oranges", 25), new PieChart.Data("Plums", 10), new PieChart.Data("Pears", 22), new PieChart.Data("Apples", 30)); final PieChart chart = new PieChart(pieChartData); chart.setTitle("Imported Fruits"); final Label caption = new Label(""); caption.setTextFill(Color.DARKORANGE); caption.setStyle("-fx-font: 24 arial;"); for (final PieChart.Data data : chart.getData()) { data.getNode().addEventHandler(MouseEvent.MOUSE_PRESSED, new EventHandler<MouseEvent>() { @Override public void handle(MouseEvent e) { caption.setTranslateX(e.getSceneX()); caption.setTranslateY(e.getSceneY()); caption.setText(String.valueOf(data.getPieValue())  + "%"); } }); }  ((Group) scene.getRoot()).getChildren().addAll(chart, caption); stage.setScene(scene); //scene.getStylesheets().add("piechartsample/Chart.css"); stage.show(); } public static void main(String[] args) { launch(args); }}

上面的代码生成以下结果。