惠州如何处理JavaFX饼图的事件？_北大青鸟IT学校

如何处理JavaFX饼图的事件？这是大家在学习Java的过程都会遇到的问题，那么下面我们一起来看看惠州北大青鸟学术部老师是怎么解答的。

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。

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//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。

想了解更多关于Java的资讯，可以来惠州北大青鸟新方舟校区了解一下。

标签：惠州计算机JAVA软件开发惠州计算机Java软件开发惠州计算机JAVA培训惠州计算机JAVA软件开发学校惠州计算机Java软件开发培训JAVAJava软件开发北大青鸟IT计算机学 校北大青鸟IT软件学校北大青鸟IT学校