【发布时间】：2016-08-22 02:10:31
【问题描述】：
我正在尝试创建一个基于给定标准显示值的条形图。不知何故，图表的行为不像我预期的那样。根据我点击的次数，它会不断增加条形的数量。请看下面的图片。有一个按钮事件生成此图，并且条形图随着我单击按钮的次数而增加。
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;
}
}
【问题讨论】：
-
您似乎正在设置一个动作侦听器inside 一个动作侦听器....（取决于您的 FXML 文件中的内容）。然后在该动作侦听器中，您将四个新系列添加到条形图中的现有系列。如果您解释一下您实际尝试做的事情，也许会有所帮助，因为这似乎是预期的行为。
-
我从方法签名中删除了那个 ActionEvent。现在，想法是在 xAxis 上显示燃料类型，在 yAxis 上显示其值。我有四类燃料类型。请让我知道该怎么做。
-
去掉参数没有任何区别。它仍然是一个动作处理方法，不是吗？不太确定您要做什么。
-
感谢您的回复。就像我说的，想法是在 xAxis 上显示燃料类型，在 yAxis 上显示值。我有四种燃料类型，我将它们添加到系列中，但不知何故它不起作用。