from this code i can generate bar chart of 10 bars now i want to know how to display value of each bar on top of bar like the attached image:
here is code:
public class BarChartSample extends Application {
@Override public void start(Stage stage) {
stage.setTitle("Bar Chart Sample");
final CategoryAxis xAxis = new CategoryAxis();
final NumberAxis yAxis = new NumberAxis();
final BarChart<String,Number> bc =
new BarChart<String,Number>(xAxis,yAxis);
bc.setTitle("Country Summary");
xAxis.setLabel("bars");
yAxis.setLabel("Value");
XYChart.Series series1 = new XYChart.Series();
series1.setName("...");
for(int i=0;i<10;i++)
{
//here i want to change color of bar if value of i is >5 than red if i>8 than blue
series1.getData().add(new XYChart.Data("Value", i));
}
}
public static void main(String[] args) {
launch(args);
}
}
Inside a ChangeListener
for the each data item's node
property, you can call the following function to add a label to the top of the bar:
private void displayLabelForData(XYChart.Data<String, Number> data) {
final Node node = data.getNode();
final Text dataText = new Text(data.getYValue() + "");
node.parentProperty().addListener(new ChangeListener<Parent>() {
@Override public void changed(ObservableValue<? extends Parent> ov, Parent oldParent, Parent parent) {
Group parentGroup = (Group) parent;
parentGroup.getChildren().add(dataText);
}
});
node.boundsInParentProperty().addListener(new ChangeListener<Bounds>() {
@Override public void changed(ObservableValue<? extends Bounds> ov, Bounds oldBounds, Bounds bounds) {
dataText.setLayoutX(
Math.round(
bounds.getMinX() + bounds.getWidth() / 2 - dataText.prefWidth(-1) / 2
)
);
dataText.setLayoutY(
Math.round(
bounds.getMinY() - dataText.prefHeight(-1) * 0.5
)
);
}
});
}
The code works by adding a text label to the parent of each bar node, then dynamically positioning the text label based on the bar and text's bounds each time the bar is resized.
I created a sample solution for this.
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