Question

我正在尝试创建一个基于给定条件显示值的条形图。不知何故，图表的表现并不像我预期的那样。根据我点击的次数，它会不断增加条数。请看下面的图片。有一个按钮事件生成此图形，条形图增加了我单击按钮的次数。

package com.naveen;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.geometry.Side;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.PieChart;
import javafx.scene.chart.PieChart.Data;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;

public class AppController {

    @FXML
    Label total_energy_result, downstream_energy_result, upstream_energy_result, error;
    @FXML
    TextField temperature;
    @FXML
    TextField moisture;
    @FXML
    TextField natural_gas;
    @FXML
    TextField diesel;
    @FXML
    TextField light_fuel_gas;
    @FXML
    TextField lpg;

    @FXML
    PieChart chart;

    @FXML
    NumberAxis yAxis;

    @FXML
    CategoryAxis xAxis;

    @FXML
    BarChart<String, Double> bar_chart;

    @FXML
    Button calculate_total_energy, generate_chart;

    private double downstream_energy;
    private double natural_gas_percent;
    private double diesel_percent;
    private double light_fuel_gas_percent;
    private double lpg_percent;
    private double upstream_energy;
    private double total_energy;

    public void doStuff(ActionEvent e) {

        calculate_total_energy.setOnAction(event -> {
            downstream_energy = (26352.77 * Double.parseDouble(moisture.getText()))
                    + (537.98 * Double.parseDouble(temperature.getText())) - 32598.9;
            natural_gas_percent = (Double.parseDouble(natural_gas.getText()) * 0.111868434193638) / 100;
            diesel_percent = (Double.parseDouble(diesel.getText()) * 0.16015875221474) / 100;
            light_fuel_gas_percent = (Double.parseDouble(light_fuel_gas.getText()) * 0.155217414842077) / 100;
            lpg_percent = (Double.parseDouble(lpg.getText()) * 0.0890627449471606) / 100;

            upstream_energy = downstream_energy
                    * (natural_gas_percent + diesel_percent + light_fuel_gas_percent + lpg_percent);

            total_energy = downstream_energy + upstream_energy;

            total_energy_result.setText(Math.round(total_energy) + " BTU");
            downstream_energy_result.setText(Math.round(downstream_energy) + " BTU");
            upstream_energy_result.setText(Math.round(upstream_energy) + " BTU");

            chart.setData(getData());
            chart.setClockwise(false);
            chart.setLegendSide(Side.BOTTOM);
            chart.setLabelsVisible(true);
            chart.setLabelLineLength(10);

            xAxis.setLabel("Fuel Type");
            yAxis.setLabel("%");

            XYChart.Series<String, Double> series1 = new Series<String, Double>();
            XYChart.Series<String, Double> series2 = new Series<String, Double>();
            XYChart.Series<String, Double> series3 = new Series<String, Double>();
            XYChart.Series<String, Double> series4 = new Series<String, Double>();

            series1.getData()
                    .add(new XYChart.Data<String, Double>("Natural", Double.parseDouble(natural_gas.getText())));
            series2.getData().add(new XYChart.Data<String, Double>("Diesel", Double.parseDouble(diesel.getText())));
            series3.getData()
                    .add(new XYChart.Data<String, Double>("Light Fuel", Double.parseDouble(light_fuel_gas.getText())));
            series4.getData().add(new XYChart.Data<String, Double>("LPG", Double.parseDouble(lpg.getText())));
            bar_chart.getData().addAll(series1,series2,series3,series4);

        });
    }

    private ObservableList<Data> getData() {
        ObservableList<Data> observableList = FXCollections.observableArrayList();
        observableList.addAll(new PieChart.Data("DownStream", downstream_energy),
                new PieChart.Data("UpStream", upstream_energy));
        return observableList;
    }

}

Answer 1

以下是我为纠正代码所做的工作。

    XYChart.Series<String, Double> series1 = new XYChart.Series<>();
    XYChart.Series<String, Double> series2 = new XYChart.Series<>();
    XYChart.Series<String, Double> series3 = new XYChart.Series<>();
    XYChart.Series<String, Double> series4 = new XYChart.Series<>();

            xAxis.setLabel("Fuel Type");
            yAxis.setLabel("%");

            series1.getData()
                    .add(new XYChart.Data<String, Double>("Natural", Double.parseDouble(natural_gas.getText())));
            series2.getData().add(new XYChart.Data<String, Double>("Diesel", Double.parseDouble(diesel.getText())));
            series3.getData()
                    .add(new XYChart.Data<String, Double>("Light Fuel", Double.parseDouble(light_fuel_gas.getText())));
            series4.getData().add(new XYChart.Data<String, Double>("LPG", Double.parseDouble(lpg.getText())));

            bar_chart.getData().add(series1);
            bar_chart.getData().add(series2);
            bar_chart.getData().add(series3);
            bar_chart.getData().add(series4);

            bar_chart.setLegendVisible(false);

Java FX BarChart无法正常工作

1 个答案: