JavaFx StackedBar Chart Issue

问题:

I have a chart with data stacked on (-,+)Y-Axis.

• With JfreeChart all this go rigth and data appear perfectly on each bar without loss.

  

• But when using javafx StackedBar Chart , when bar series have (positive & negative) data stacked bar corrupted and loss data.

  

              if (plusValue > 0) {                 series.getData().add(new XYChart.Data<String, Number>(xPoint, plusValue));             }             if (minusValue > 0) {                 series.getData().add(new XYChart.Data<String, Number>(xPoint, -minusValue));             } 

Update :

-Oracle StackedBarChart Sample - "I change Series value"

import java.util.Arrays; import javafx.application.Application; import javafx.collections.FXCollections; 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.stage.Stage;  public class StackedBarChartSample extends Application {  final static String austria = "Austria"; final static String brazil = "Brazil"; final static String france = "France"; final static String italy = "Italy"; final static String usa = "USA"; final CategoryAxis xAxis = new CategoryAxis(); final NumberAxis yAxis = new NumberAxis(); final StackedBarChart<String, Number> sbc =         new StackedBarChart<String, Number>(xAxis, yAxis); final XYChart.Series<String, Number> series1 =         new XYChart.Series<String, Number>(); final XYChart.Series<String, Number> series2 =         new XYChart.Series<String, Number>(); final XYChart.Series<String, Number> series3 =         new XYChart.Series<String, Number>();  @Override public void start(Stage stage) {     stage.setTitle("Bar Chart Sample");     sbc.setTitle("Country Summary");     xAxis.setLabel("Country");     xAxis.setCategories(FXCollections.<String>observableArrayList(             Arrays.asList(austria, brazil, france, italy, usa)));     yAxis.setLabel("Value");     series1.setName("2003");     // plus value     series1.getData().add(new XYChart.Data<String, Number>(austria, 200));     series1.getData().add(new XYChart.Data<String, Number>(brazil, 300));     series1.getData().add(new XYChart.Data<String, Number>(france, 400));     series1.getData().add(new XYChart.Data<String, Number>(italy, 500));     series1.getData().add(new XYChart.Data<String, Number>(usa, 600));     // minus value     series1.getData().add(new XYChart.Data<String, Number>(austria, -200));     series1.getData().add(new XYChart.Data<String, Number>(brazil, -300));     series1.getData().add(new XYChart.Data<String, Number>(france, -400));     series1.getData().add(new XYChart.Data<String, Number>(italy, -500));     series1.getData().add(new XYChart.Data<String, Number>(usa, -600));     series2.setName("2004");     series2.getData().add(new XYChart.Data<String, Number>(austria, 200));     series2.getData().add(new XYChart.Data<String, Number>(brazil, 300));     series2.getData().add(new XYChart.Data<String, Number>(france, 400));     series2.getData().add(new XYChart.Data<String, Number>(italy, 500));     series2.getData().add(new XYChart.Data<String, Number>(usa, 600));     // minus value     series2.getData().add(new XYChart.Data<String, Number>(austria, -200));     series2.getData().add(new XYChart.Data<String, Number>(brazil, -300));     series2.getData().add(new XYChart.Data<String, Number>(france, -400));     series2.getData().add(new XYChart.Data<String, Number>(italy, -500));     series2.getData().add(new XYChart.Data<String, Number>(usa, -600));     series3.setName("2005");     series3.getData().add(new XYChart.Data<String, Number>(austria, 200));     series3.getData().add(new XYChart.Data<String, Number>(brazil, 300));     series3.getData().add(new XYChart.Data<String, Number>(france, 400));     series3.getData().add(new XYChart.Data<String, Number>(italy, 500));     series3.getData().add(new XYChart.Data<String, Number>(usa, 600));     // minus value     series3.getData().add(new XYChart.Data<String, Number>(austria, -200));     series3.getData().add(new XYChart.Data<String, Number>(brazil, -300));     series3.getData().add(new XYChart.Data<String, Number>(france, -400));     series3.getData().add(new XYChart.Data<String, Number>(italy, -500));     series3.getData().add(new XYChart.Data<String, Number>(usa, -600));     Scene scene = new Scene(sbc, 800, 600);     sbc.getData().addAll(series1, series2, series3);     stage.setScene(scene);     stage.show(); }  public static void main(String[] args) {     launch(args); } 

}

• Without minus value.
  

• With minus value data corrupted.
  

回答1:

I found the bug on the StackedBarChart code:

    private Map<Series, Map<String,Data<X, Y>>> seriesCategoryMap = new HashMap<Series, Map<String, Data<X, Y>>>(); 

• That Line of code mean that each series has map<String categoryPoint ,data bar>,so that series has only one bar for that categoryPoint, and that bar will be the last value putted into map as map will clear previous bar data.

  categoryMap.put(categoryPoint,bar);  

• But we need for each series in seriesCategoryMap to have categoryMap But that map must have for each categoryPoint to be List<Data>.

• Conclusions, for each series we have categoryMap and for each categoryPoint in that categoryMap we have List<Data<X,Y>> bar List to have positive and negative bars.

• So that line of code become.

  private Map<Series, Map<String, List<Data<X, Y>>>> seriesCategoryMap = new HashMap<Series, Map<String, List<Data<X, Y>>>>(); 

• After that we have to update the code depend on that data Structure.

1-Update 'dataItemAdded & seriesAdded' methods.

        // list to hold more that one bar "positive and negative"     List<Data<X, Y>> itemList = categoryMap.get(category) != null ? categoryMap.get(category) : new ArrayList<Data<X, Y>>();     itemList.add(item);     categoryMap.put(category, itemList);  

2-getDataItem method.

    private List<Data<X, Y>> getDataItem(Series<X, Y> series, int seriesIndex, int itemIndex, String category) {     Map<String, List<Data<X, Y>>> catmap = seriesCategoryMap.get(series);     return catmap != null ? catmap.get(category) != null ? catmap.get(category) : new ArrayList<Data<X, Y>>() : new ArrayList<Data<X, Y>>(); } 

3-updateAxisRange & layoutPlotChildren update that two method to manage bar length over negative and positive values axis.

• Updated code for StackedBarChart

• Oracle StackedBarChart Sample with positive and negative bars

• StackedBarChart show bar perfectly without any data corruption

  

回答2:

Use...

http://download.oracle.com/otndocs/products/javafx/2.2/samples/Ensemble/index.html

or

JavaFX Scene Builder 1.1

文章来源: JavaFx StackedBar Chart Issue