Java SE (Java Platform, Standard Edition)

Hello -

I have an AreaChart using all default styles...nothing is being done from my end to it as far as css/styles.

I see this message on the console

"Missing initial moveto in path definition. Path: Path@fe315d[styleClass=chart-series-area-fill series0 default-color0]"

What does this mean and how do I fix it?

Here's the code you could run, to see the message on output...


import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.animation.AnimationTimer;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.stage.Stage;

/**
* A chart that fills in the area between a line of data points and the axes.
* Good for comparing accumulated totals over time.
*
* @see javafx.scene.chart.Chart
* @see javafx.scene.chart.Axis
* @see javafx.scene.chart.NumberAxis
* @related charts/line/LineChart
* @related charts/scatter/ScatterChart
*/
public class AreaChartSample extends Application {
private static final int MAX_DATA_POINTS = 50;

private Series series;
private int xSeriesData = 0;
private ConcurrentLinkedQueue<Number> dataQ = new ConcurrentLinkedQueue<Number>();
private ExecutorService executor;
private AddToQueue addToQueue;
private Timeline timeline2;
private NumberAxis xAxis;

private void init(Stage primaryStage) {
xAxis = new NumberAxis(0,MAX_DATA_POINTS,MAX_DATA_POINTS/10);
xAxis.setForceZeroInRange(false);
xAxis.setAutoRanging(false);

NumberAxis yAxis = new NumberAxis();
yAxis.setAutoRanging(true);

//-- Chart
final AreaChart<Number, Number> sc = new AreaChart<Number, Number>(xAxis, yAxis) {
// Override to remove symbols on each data point
@Override protected void dataItemAdded(Series<Number, Number> series, int itemIndex, Data<Number, Number> item) {}
};
sc.setAnimated(false);
sc.setId("liveAreaChart");
sc.setTitle("Animated Area Chart");

//-- Chart Series
series = new AreaChart.Series<Number, Number>();
series.setName("Area Chart Series");
sc.getData().add(series);

primaryStage.setScene(new Scene(sc));
}

@Override public void start(Stage primaryStage) throws Exception {
init(primaryStage);
primaryStage.show();

//-- Prepare Executor Services
executor = Executors.newCachedThreadPool();
addToQueue = new AddToQueue();
executor.execute(addToQueue);
//-- Prepare Timeline
prepareTimeline();
}

public static void main(String[] args) {
launch(args);
}

private class AddToQueue implements Runnable {
public void run() {
try {
// add a item of random data to queue
dataQ.add(Math.random());
Thread.sleep(50);
executor.execute(this);
} catch (InterruptedException ex) {
Logger.getLogger(AreaChartSample.class.getName()).log(Level.SEVERE, null, ex);
}
}
}

//-- Timeline gets called in the JavaFX Main thread
private void prepareTimeline() {
// Every frame to take any data from queue and add to chart
new AnimationTimer() {
@Override public void handle(long now) {
addDataToSeries();
}
}.start();
}

private void addDataToSeries() {
for (int i = 0; i < 20; i++) { //-- add 20 numbers to the plot+
if (dataQ.isEmpty()) break;
series.getData().add(new AreaChart.Data(xSeriesData++, dataQ.remove()));
}
// remove points to keep us at no more than MAX_DATA_POINTS
if (series.getData().size() > MAX_DATA_POINTS) {
series.getData().remove(0, series.getData().size() - MAX_DATA_POINTS);
}
// update
xAxis.setLowerBound(xSeriesData-MAX_DATA_POINTS);
xAxis.setUpperBound(xSeriesData-1);
}
}