我正在尝试使用一些随机信息创建一个简单的LineChart,但是当我尝试通过SceneBuilder使用fxml文件时,图表显示但永远不会被填充。每当我手动创建vbox,线图和场景时,一切正常。我很困惑使用fxml文件时图表代码应该去哪里。
public class Main extends Application {
LineChart chart1;
@Override
public void start(Stage primaryStage) throws Exception {
//Through FXML
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Chart Test");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
//Manually
// LineChart chart1;
// XYChart.Series series1 = new XYChart.Series();
// NumberAxis xAxis = new NumberAxis();
// NumberAxis yAxis = new NumberAxis();
// xAxis.setLabel("X Axis");
// yAxis.setLabel("Y Axis");
// series1.setName("Series 1");
// chart1 = new LineChart(xAxis, yAxis);
// series1.getData().add(new XYChart.Data<>(1, 20));
// series1.getData().add(new XYChart.Data<>(2, 100));
// series1.getData().add(new XYChart.Data<>(3, 80));
// series1.getData().add(new XYChart.Data<>(4, 180));
// series1.getData().add(new XYChart.Data<>(5, 20));
// series1.getData().add(new XYChart.Data<>(6, -10));
// chart1.getData().add(series1);
// VBox vbox=new VBox(chart1);
// Scene scene=new Scene(vbox,600,400);
// primaryStage.setScene(scene);
// primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
public class Controller implements Initializable {
@FXML
LineChart chart1;
@Override
public void initialize(URL location, ResourceBundle resources) {
XYChart.Series series1 = new XYChart.Series();
NumberAxis xAxis = new NumberAxis();
NumberAxis yAxis = new NumberAxis();
xAxis.setLabel("X Axis");
yAxis.setLabel("Y Axis");
series1.setName("Series 1");
chart1 = new LineChart(xAxis, yAxis);
series1.getData().add(new XYChart.Data<>(1, 20));
series1.getData().add(new XYChart.Data<>(2, 100));
series1.getData().add(new XYChart.Data<>(3, 80));
series1.getData().add(new XYChart.Data<>(4, 180));
series1.getData().add(new XYChart.Data<>(5, 20));
series1.getData().add(new XYChart.Data<>(6, -10));
chart1.getData().add(series1);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.LineChart?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<GridPane alignment="center" hgap="10" vgap="10" xmlns="http://javafx.com/javafx/8.0.141" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<columnConstraints>
<ColumnConstraints />
</columnConstraints>
<rowConstraints>
<RowConstraints />
</rowConstraints>
<children>
<BorderPane prefHeight="298.0" prefWidth="356.0">
<center>
<LineChart fx:id="chart1" title="Chart Test" BorderPane.alignment="CENTER">
<xAxis>
<CategoryAxis side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis side="LEFT" />
</yAxis>
</LineChart>
</center>
</BorderPane>
</children>
</GridPane>
答案 0 :(得分:0)
您已使用代码
在FXML文件中创建了LineChart
和轴
<LineChart fx:id="chart1" title="Chart Test" BorderPane.alignment="CENTER">
<xAxis>
<CategoryAxis side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis side="LEFT" />
</yAxis>
</LineChart>
此图表将添加到边框窗格,该窗格又会添加到从FXMLLoader.load()
方法返回并放置在场景中的网格窗格中。
但是,在您的initialize()
方法中,您可以创建另一个折线图:
chart1 = new LineChart(xAxis, yAxis);
然后您继续填充数据。由于此新线图永远不会显示在场景中,因此您永远不会看到数据。
另外,请注意两个图表之间存在差异:在FXML中创建的图表中,您有一个CategoryAxis
,它是一个Axis<String>
作为x轴,但是在创建的图表中在控制器中,您使用NumberAxis
作为x轴。您可能需要NumberAxis
,因此请更改FXML:
<LineChart fx:id="chart1" title="Chart Test" BorderPane.alignment="CENTER">
<xAxis>
<NumberAxis side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis side="LEFT" />
</yAxis>
</LineChart>
然后只需删除第二个折线图(和第二组轴)的创建:
@FXML
LineChart<Number, Number> chart1;
@Override
public void initialize(URL location, ResourceBundle resources) {
XYChart.Series<Number, Number> series1 = new XYChart.Series<>();
series1.setName("Series 1");
series1.getData().add(new XYChart.Data<>(1, 20));
series1.getData().add(new XYChart.Data<>(2, 100));
series1.getData().add(new XYChart.Data<>(3, 80));
series1.getData().add(new XYChart.Data<>(4, 180));
series1.getData().add(new XYChart.Data<>(5, 20));
series1.getData().add(new XYChart.Data<>(6, -10));
chart1.getData().add(series1);
}