JavaFX 折线图（java swing 折线图）

折线图，一种双轴图表，显示了特定时间间隔内数据的动态。

对于双轴图表，我们可以定义一系列数据XYChart.Series类。

我们可以为每个系列分配一个名称，以便在图例中显示。

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class Main extends Application {
 @Override
 public void start(Stage stage) {
 final NumberAxis xAxis = new NumberAxis();
 final NumberAxis yAxis = new NumberAxis();
 xAxis.setLabel("Number of Month");
 final LineChart<Number, Number> lineChart = new LineChart<Number, Number>(
 xAxis, yAxis);
 lineChart.setTitle("Line Chart");
 XYChart.Series<Number, Number> series = new XYChart.Series<Number, Number>();
 series.setName("My Data");
 // populating the series with data
 series.getData().add(new XYChart.Data<Number, Number>(1, 23));
 series.getData().add(new XYChart.Data<Number, Number>(2, 114));
 series.getData().add(new XYChart.Data<Number, Number>(3, 15));
 series.getData().add(new XYChart.Data<Number, Number>(4, 124));
 Scene scene = new Scene(lineChart, 800, 600);
 lineChart.getData().add(series);
 stage.setScene(scene);
 stage.show();
 }
 public static void main(String[] args) {
 launch(args);
 }
}

上面的代码生成以下结果。

折线图创建

对于每个图表，我们可以设置标题及其相对于图表的位置。标题可以位于图表的顶部，右侧，左侧或底部。

我们可以以相同的方式指定图表图例的位置。

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Series;
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) {
 CategoryAxis xAxis = new CategoryAxis();
 NumberAxis yAxis = new NumberAxis();
 LineChart lineChart = new LineChart(xAxis, yAxis);
 lineChart.setData(getChartData());
 lineChart.setTitle("Chart");
 StackPane root = new StackPane();
 root.getChildren().add(lineChart);
 primaryStage.setScene(new Scene(root, 400, 250));
 primaryStage.show();
 }
 private ObservableList<XYChart.Series<String, Double>> getChartData() {
 double aValue = 10;
 double cValue = 20;
 ObservableList<XYChart.Series<String, Double>> answer = FXCollections
 .observableArrayList();
 Series<String, Double> aSeries = new Series<String, Double>();
 Series<String, Double> cSeries = new Series<String, Double>();
 aSeries.setName("a");
 cSeries.setName("C");
 for (int i = 2001; i < 2021; i++) {
 aSeries.getData().add(new XYChart.Data(Integer.toString(i), aValue));
 aValue = aValue + Math.random()*100 -50;
 cSeries.getData().add(new XYChart.Data(Integer.toString(i), cValue));
 cValue = cValue + Math.random()*100 -50 ;
 }
 answer.addAll(aSeries, cSeries);
 return answer;
 }
}

上面的代码生成以下结果。

折线图的类别

下面的代码显示了如何使用CategoryAxis类而不是NumberAxis类以在线形图中呈现非数字数据。

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class Main extends Application {
 @Override
 public void start(Stage stage) {
 final CategoryAxis xAxis = new CategoryAxis();
 final NumberAxis yAxis = new NumberAxis();
 xAxis.setLabel("Month");
 final LineChart<String, Number> lineChart = new LineChart<String, Number>(
 xAxis, yAxis);
 lineChart.setTitle("My Chart");
 XYChart.Series<String, Number> series = new XYChart.Series<String, Number>();
 series.setName("My data");
 series.getData().add(new XYChart.Data<String, Number>("Jan", 23));
 series.getData().add(new XYChart.Data<String, Number>("Feb", 114));
 series.getData().add(new XYChart.Data<String, Number>("Mar", 15));
 series.getData().add(new XYChart.Data<String, Number>("Apr", 24));
 series.getData().add(new XYChart.Data<String, Number>("May", 134));
 Scene scene = new Scene(lineChart, 800, 600);
 lineChart.getData().add(series);
 stage.setScene(scene);
 stage.show();
 }
 public static void main(String[] args) {
 launch(args);
 }
}

上面的代码生成以下结果。

将系列添加到折线图

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class Main extends Application {
 @Override
 public void start(Stage stage) {
 final CategoryAxis xAxis = new CategoryAxis();
 final NumberAxis yAxis = new NumberAxis();
 xAxis.setLabel("Month");
 final LineChart<String, Number> lineChart = new LineChart<String, Number>(
 xAxis, yAxis);
 lineChart.setTitle("My Chart");
 XYChart.Series<String, Number> series1 = new XYChart.Series<String, Number>();
 series1.setName("Portfolio 1");
 series1.getData().add(new XYChart.Data<String, Number>("Jan", 23));
 series1.getData().add(new XYChart.Data<String, Number>("Feb", 14));
 series1.getData().add(new XYChart.Data<String, Number>("Mar", 15));
 XYChart.Series<String, Number> series2 = new XYChart.Series<String, Number>();
 series2.setName("Portfolio 2");
 series2.getData().add(new XYChart.Data<String, Number>("Jan", 33));
 series2.getData().add(new XYChart.Data<String, Number>("Feb", 34));
 series2.getData().add(new XYChart.Data<String, Number>("Mar", 25));
 series2.getData().add(new XYChart.Data<String, Number>("Apr", 44));
 XYChart.Series<String, Number> series3 = new XYChart.Series<String, Number>();
 series3.setName("Portfolio 3");
 series3.getData().add(new XYChart.Data<String, Number>("Jan", 44));
 series3.getData().add(new XYChart.Data<String, Number>("Feb", 35));
 series3.getData().add(new XYChart.Data<String, Number>("Mar", 36));
 series3.getData().add(new XYChart.Data<String, Number>("Apr", 33));
 series3.getData().add(new XYChart.Data<String, Number>("May", 31));
 Scene scene = new Scene(lineChart, 800, 600);
 lineChart.getData().addAll(series1, series2, series3);
 stage.setScene(scene);
 stage.show();
 }
 public static void main(String[] args) {
 launch(args);
 }
}