[英]JavaFX BarChart doesn't update
我的窗口中有以下控制器:
package window;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.chart.BarChart;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import java.util.Map;
import java.util.SortedMap;
public class StatisticsController {
@FXML
private BarChart<String, Number> barChartHistogram;
private SortedMap<String, Integer> _points;
final CategoryAxis xAxis = new CategoryAxis();
final NumberAxis yAxis = new NumberAxis();
public void onLoad(SortedMap<String, Integer> points) {
barChartHistogram = new BarChart<String, Number>(xAxis,yAxis);
barChartHistogram.setCategoryGap(0);
barChartHistogram.setBarGap(0);
xAxis.setLabel("Numer indeksu");
yAxis.setLabel("Ilość punktów");
XYChart.Series series = new XYChart.Series();
series.setName("Histogram");
for (Map.Entry<String, Integer> p: points.entrySet()) {
series.getData().add(new XYChart.Data(p.getKey(), p.getValue()));
}
barChartHistogram.getData().addAll(series);
_points = points;
}
@FXML
private void buttonShowPressed(ActionEvent event) {
xAxis.setLabel("Numer indeksu");
yAxis.setLabel("Ilość punktów");
barChartHistogram = new BarChart<String, Number>(xAxis,yAxis);
barChartHistogram.setCategoryGap(0);
barChartHistogram.setBarGap(0);
barChartHistogram.setTitle("XDDDDDDDDDDDDDDD");
barChartHistogram.setMaxHeight(1000);
XYChart.Series series = new XYChart.Series();
series.setName("Histogram");
for (Map.Entry<String, Integer> p: _points.entrySet()) {
series.getData().add(new XYChart.Data(p.getKey(), p.getValue()));
}
barChartHistogram.getData().addAll(series);
}
}
此窗口的.fxml
文件:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.chart.BarChart?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="window.StatisticsController">
<children>
<BarChart fx:id="barChartHistogram" layoutX="40.0" layoutY="14.0" prefHeight="372.0" prefWidth="500.0">
<xAxis>
<CategoryAxis side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis side="LEFT" />
</yAxis>
</BarChart>
<Button fx:id="buttonShow" layoutY="337.0" mnemonicParsing="false" onAction="#buttonShowPressed" text="Button" />
</children>
</AnchorPane>
現在的問題是,當我按下按鈕時,什么都沒有改變(這里的onLoad()
方法用於測試onLoad
C#的行為)。 條形圖保持不變,沒有數據,標簽或標題(我在調試器中檢查了數據, barCharHistogram
對象的data
屬性下有我的數據)。 我做錯了什么嗎? 如何使其像重畫條形圖一樣?
您已經在FXML中定義了所需的一切。 您不應該在控制器中創建新圖表或新軸。
將fx:id
s添加到軸:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.chart.BarChart?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="window.StatisticsController">
<children>
<BarChart fx:id="barChartHistogram" layoutX="40.0" layoutY="14.0" prefHeight="372.0" prefWidth="500.0">
<xAxis>
<CategoryAxis fx:id="xAxis" side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis fx:d="yAxis" side="LEFT" />
</yAxis>
</BarChart>
<Button fx:id="buttonShow" layoutY="337.0" mnemonicParsing="false" onAction="#buttonShowPressed" text="Button" />
</children>
</AnchorPane>
然后你可以做
public class StatisticsController {
@FXML
private BarChart<String, Number> barChartHistogram;
private SortedMap<String, Integer> _points;
@FXML
private CategoryAxis xAxis ;
@FXML
private NumberAxis yAxis ;
@FXML
private void buttonShowPressed(ActionEvent event) {
xAxis.setLabel("Numer indeksu");
yAxis.setLabel("Ilość punktów");
barChartHistogram.setCategoryGap(0);
barChartHistogram.setBarGap(0);
barChartHistogram.setTitle("XDDDDDDDDDDDDDDD");
barChartHistogram.setMaxHeight(1000);
XYChart.Series series = new XYChart.Series();
series.setName("Histogram");
for (Map.Entry<String, Integer> p: _points.entrySet()) {
series.getData().add(new XYChart.Data(p.getKey(), p.getValue()));
}
barChartHistogram.getData().addAll(series);
}
}
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