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[英]JavaFX: How to add serveral series dynimically on Area Chart and delete line(series) from chart?
[英]JavaFX: How to deserialize dynamically create Area Chart Series?
我正在使用面积图中的列表动态添加序列。 我想拆开系列。 我需要这样做,因为我想将面积图系列数据保存在db中。
应用执行时如下所示:
用户可以通过填充文本字段并单击“添加”按钮来添加系列:
我想要的是,当用户单击“保存”按钮时,它应该将已经添加的系列转换为数据,以便将其存储在db中。 但是我尝试过的操作并没有给我准确的数据。 根据聊天系列,我想要这样的输出:
Series 0 Employees: 5
Series 0 Start: 1
Series 0 End: 7
Series 1 Employees: 3
Series 1 Start: 9
Series 1 End: 12
但是我得到这个:
Series 0 Employees: 5
Series 0 Start: 1
Series 0 End: 5
Series 1 Employees: 3
Series 1 Start: 10
Series 1 End: 5
码:
import java.net.URL;
import java.util.LinkedList;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.XYChart;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.control.TextField;
/**
*
* @author blj0011
*/
public class SampleController implements Initializable {
@FXML
private AreaChart<Number, Number> areaChart;
@FXML
private TextField txtSt;
@FXML
private TextField txtEt;
@FXML
private TextField txtNb;
LinkedList<XYChart.Series<Number, Number>> seriesContainer = new LinkedList<Series<Number, Number>>();
//Button add functionality
@FXML
private void generateGraph() {
Double start = Double.parseDouble(txtSt.getText());
Double end = Double.parseDouble(txtEt.getText());
double numberEmployees = Integer.parseInt(txtNb.getText());
XYChart.Series<Number, Number> series= new XYChart.Series<>();
for (int i = start.intValue(); i <= end.intValue(); i++) {
series.getData().add(new XYChart.Data(i, numberEmployees));
}
// Add Series to series container.
seriesContainer.add(series);
//Add only new series to AreaChart
for(XYChart.Series<Number, Number> entry : seriesContainer)
{
if(!areaChart.getData().contains(entry))
{
areaChart.getData().add(entry);
entry.setName("XYChart.Series "+seriesContainer.size()); }
}
}
//Button delete functionality
@FXML
private void deleteGraph() {
}
//Button Undo functionality
@FXML
private void undoGraph(){
}
//Button Save functionality
@FXML
private void saveGraph(){
int max = 0;
for(int i =0; i< seriesContainer.size(); i++){
XYChart.Series<Number, Number> test = seriesContainer.get(i);
System.out.println("Series "+i+" Employees: "+test.getData().get(i).getYValue().intValue());
System.out.println("Series "+i+" Start: "+test.getData().get(i).getXValue().intValue());
// find maximal y value
int x = test.getData().get(i).getYValue().intValue();
if (x > max) {
max = x;
}
System.out.println("Series "+i+" End: "+max);
}
}
@Override
public void initialize(URL location, ResourceBundle resources) {
areaChart.setTitle("Chronos");
areaChart.getXAxis().setLabel("Heures");
areaChart.getYAxis().setLabel("Employés");
}
}
XML文件
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.chart.AreaChart?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<VBox alignment="CENTER" prefHeight="800.0" prefWidth="800.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.SampleController">
<children>
<AreaChart fx:id="areaChart" prefHeight="799.0" prefWidth="800.0" VBox.vgrow="ALWAYS">
<xAxis>
<NumberAxis autoRanging="false" minorTickCount="1" minorTickLength="1.0" side="BOTTOM" tickLabelGap="1.0" tickLength="1.0" tickUnit="1.0" upperBound="24.0" fx:id="xAxis" />
</xAxis>
<yAxis>
<NumberAxis fx:id="yAxis" autoRanging="false" minorTickLength="1.0" side="LEFT" tickLabelGap="1.0" tickUnit="1.0" upperBound="10.0" />
</yAxis>
</AreaChart>
<HBox alignment="CENTER" prefHeight="193.0" prefWidth="800.0">
<children>
<TextField fx:id="txtSt" promptText="Start Value" />
<TextField fx:id="txtEt" promptText="End Value" />
<TextField fx:id="txtNb" promptText="Number of Employees" />
</children>
</HBox>
<HBox alignment="CENTER" prefHeight="71.0" prefWidth="800.0">
<children>
<Button mnemonicParsing="false" onAction="#generateGraph" prefHeight="31.0" prefWidth="137.0" text="Add" />
<Button layoutX="342.0" layoutY="12.0" mnemonicParsing="false" onAction="#deleteGraph" prefHeight="31.0" prefWidth="137.0" text="Delete" />
<Button layoutX="410.0" layoutY="12.0" mnemonicParsing="false" onAction="#undoGraph" prefHeight="31.0" prefWidth="137.0" text="Undo" />
<Button layoutX="479.0" layoutY="10.0" mnemonicParsing="false" onAction="#saveGraph" prefHeight="31.0" prefWidth="137.0" text="Save" />
</children>
</HBox>
</children>
</VBox>
请有人指导我如何解决此问题,并需要一些指导如何将数据存储在H2 dB中。 我在Spring Boot中使用JavaFX。
有多种方法可以实现此目的。 有些比其他的快。 我将向您展示可以完成ti的一种简单方法,但是请注意有几种方法。
如果不关心速度,那么我想将对象序列化为base64文本。 这样就很容易在文本中移动和存储在数据库中。 如果我在一个需要大量数据移动速度的项目中工作,那么我可能不会采用这种方法。
1)使用Java序列化将对象序列化为byte[]
。
protected byte[] convertToBytes(Object object) throws IOException {
try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutput out = new ObjectOutputStream(bos)) {
out.writeObject(object);
return bos.toByteArray();
}
}
protected Object convertFromBytes(byte[] bytes) throws IOException, ClassNotFoundException {
try (ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
ObjectInput in = new ObjectInputStream(bis)) {
return in.readObject();
}
}
这些方法可用于转换Java对象,以将对象转换为byte []或转换为byte []。
2)从第1步中获取byte []并将其用于序列化为base64文本。 这两个方法会将您的seriesContainer
转换为base64 String,或者将base64字符串转换为seriesContainer
。
public String toBase64() {
try {
return Base64.getEncoder().encodeToString(convertToBytes(seriesContainer));
} catch (IOException ex) {
throw new RuntimeException("Got exception while converting to bytes.", ex);
}
}
public void initializeFromBase64(String b64) {
byte[] bytes = Base64.getDecoder().decode(b64);
try {
this.seriesContainer = (LinkedList<XYChart.Series<Number, Number>>) convertFromBytes(bytes);
} catch (Exception ex) {
throw new RuntimeException("Got exception while converting from bytes.", ex);
}
}
3)从第2步中获取字符串,并将其放入数据库中,或从数据库中读取。
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