Javafx StackedBarChart错误 [英] Javafx StackedBarChart bug
问题描述
我正在使用一些StackedBarChart开发应用程序，但是我发现我认为是一个小错误，如果将图表的动画属性设置为false，则不会呈现负值.尝试下面的代码进行测试，有人知道如何解决吗?
I'm developing an application using some StackedBarChart but i've found what i think is a little bug, negative values are not rendered if the animated property of the chart is set to false. Try the code below to test it, anyone know how to solve it ?
谢谢.
import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.StackedBarChart;
import javafx.scene.chart.XYChart;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
/**
* Created by fabiofrumento on 28/04/15.
*/
public class Scratch extends Application {
private static final SimpleDateFormat ONESECOND_CHART_DATE_FORMAT = new SimpleDateFormat("HH:mm:ss",
Locale.ENGLISH);
private boolean stopThreads;
CategoryAxis xAxisActive = new CategoryAxis();
CategoryAxis xAxisReactive = new CategoryAxis();
NumberAxis yAxisActive = new NumberAxis();
NumberAxis yAxisReactive = new NumberAxis();
{
xAxisActive.setLabel("Time");
xAxisReactive.setLabel("Time");
yAxisActive.setLabel("animated = false");
yAxisReactive.setLabel("animated = true");
}
private StackedBarChart<String, Number> onesecondActiveBarChart = new StackedBarChart<String, Number>(xAxisActive,
yAxisActive);
private StackedBarChart<String, Number> onesecondReactiveBarChart = new StackedBarChart<String, Number>(xAxisReactive,
yAxisReactive);
private XYChart.Series<String, Number> onesecondActiveConsumedSerie = new XYChart.Series<>();
private XYChart.Series<String, Number> onesecondActiveGeneratedSerie = new XYChart.Series<>();
private XYChart.Series<String, Number> onesecondReactiveConsumedSerie = new XYChart.Series<>();
private XYChart.Series<String, Number> onesecondReactiveGeneratedSerie = new XYChart.Series<>();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws
Exception {
VBox root = new VBox();
initCharts();
root.getChildren()
.addAll(onesecondActiveBarChart,
onesecondReactiveBarChart);
Scene scene = new Scene(root,
1024,
768);
primaryStage.setTitle("JecomoduleUI");
primaryStage.setScene(scene);
primaryStage.setFullScreen(true);
primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
@Override
public void handle(WindowEvent event) {
stopThreads = true;
}
});
primaryStage.show();
new Thread(new Runnable() {
@Override
public void run() {
while (!stopThreads) {
try {
Thread.sleep(1000);
Platform.runLater(new Runnable() {
@Override
public void run() {
updateActiveData();
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}).start();
}
private void initCharts() {
onesecondActiveConsumedSerie.setName("Cons. W");
onesecondActiveGeneratedSerie.setName("Gen. W");
onesecondReactiveConsumedSerie.setName("Cons. VAR");
onesecondReactiveGeneratedSerie.setName("Gen.. VAR");
onesecondActiveBarChart.getData()
.addAll(onesecondActiveConsumedSerie,
onesecondActiveGeneratedSerie);
onesecondActiveBarChart.setAnimated(false);
onesecondReactiveBarChart.getData()
.addAll(onesecondReactiveConsumedSerie,
onesecondReactiveGeneratedSerie);
}
void updateActiveData() {
Date format = new Date();
Integer oneSecondActiveConsumedValue;
Integer oneSecondActiveGeneratedValue;
Double rand = Math.random();
Integer rnd = new Double(1000l + rand * 9000l).intValue();
if (rnd % 2 == 0) {
oneSecondActiveConsumedValue = rnd;
oneSecondActiveGeneratedValue = 0;
} else {
oneSecondActiveConsumedValue = 0;
oneSecondActiveGeneratedValue = 0 - rnd;
}
onesecondActiveConsumedSerie.getData()
.add(new XYChart.Data<String, Number>(ONESECOND_CHART_DATE_FORMAT.format(format),
oneSecondActiveConsumedValue));
if (onesecondActiveConsumedSerie.getData()
.size() > 10)
onesecondActiveConsumedSerie.getData()
.remove(0);
onesecondActiveGeneratedSerie.getData()
.add(new XYChart.Data<String, Number>(ONESECOND_CHART_DATE_FORMAT.format(format),
oneSecondActiveGeneratedValue));
if (onesecondActiveGeneratedSerie.getData()
.size() > 10)
onesecondActiveGeneratedSerie.getData()
.remove(0);
onesecondReactiveConsumedSerie.getData()
.add(new XYChart.Data<String, Number>(ONESECOND_CHART_DATE_FORMAT.format(format),
oneSecondActiveConsumedValue));
if (onesecondReactiveConsumedSerie.getData()
.size() > 10)
onesecondReactiveConsumedSerie.getData()
.remove(0);
onesecondReactiveGeneratedSerie.getData()
.add(new XYChart.Data<String, Number>(ONESECOND_CHART_DATE_FORMAT.format(format),
oneSecondActiveGeneratedValue));
if (onesecondReactiveGeneratedSerie.getData()
.size() > 10)
onesecondReactiveGeneratedSerie.getData()
.remove(0);
}
}
推荐答案
是的，这似乎是JavaFX错误(Java 8u60).
Yes, this seems to be a JavaFX error (Java 8u60).
查看StackedBarChart的源代码，只有在项目节点的样式类中找到负"的情况下，才可以正确绘制负值的项目(请参见StackedBarChart#layoutPlotChildren).
Looking at the source code of StackedBarChart, an item with negative value gets drawn correctly only if "negative" is found in the style classes of the item's node (see StackedBarChart#layoutPlotChildren).
负"样式应由StackedBarChart#dataItemAdded设置.对于动画图表，将调用StackedBarChart#animateData，如果该项的值为负，则在节点上添加负"样式.
The "negative" style should be set by StackedBarChart#dataItemAdded. For animated charts StackedBarChart#animateData is called, where the "negative" style is added to the node if the item's value is negative.
对于非动画数据，将节点添加到聊天的绘图子级中，而无需更新样式类.
For non-animated data, the node gets added to the chat's plot children without updating the style class.
作为解决方法，请覆盖onesecondActiveBarChart的dataItemAdded:
As a workaround, override dataItemAdded of onesecondActiveBarChart:
private StackedBarChart<String, Number> onesecondActiveBarChart = new StackedBarChart<String, Number>(xAxisActive, yAxisActive) {
@Override
protected void dataItemAdded(XYChart.Series<String,Number> series, int itemIndex, XYChart.Data<String,Number> item) {
super.dataItemAdded(series, itemIndex, item);
Node bar = item.getNode();
double barVal = item.getYValue().doubleValue();
if (barVal < 0) {
bar.getStyleClass().add("negative");
}
}
};
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