Addint a figure/shape to the end of the XYSeries

[Siniz]

Hey!

I am wondering if someone knows how to add a small figure/shape to the last datapoint added to a XYSeries? I just want to indicate that a certain point was the last oen added.

Thanks.

[RoyW]

This is one way to do it (tested and works). Of course not knowing how you created your dataset/dataseries - plot/chart, I don't know if it will work for you.

Code: Select all

        Drawable drawable= new Drawable(){
            public void draw(Graphics2D graphics2D, Rectangle2D rectangle2D) {
                graphics2D.setColor(Color.BLUE);
                graphics2D.draw(rectangle2D);
            }
        };
        XYDrawableAnnotation xyDrawableAnnotation = new XYDrawableAnnotation(
                dataset.getXValue(0, dataset.getItemCount(0)-1), dataset.getYValue(0, dataset.getItemCount(0)-1),
                20, 20, drawable
                );
        xyPlot.addAnnotation(xyDrawableAnnotation);

[Siniz]

I figured out a way to do it myself. Going to test this way too to see what gives me the best performance. (I'm drawing dynamic/realtime charts to performance is an issue)

Thanks a ton though and I do appreciate the help.

[david.gilbert]

If you are using XYLineAndShapeRenderer you could subclass it, and override the getItemShapeVisible() method - modifying it so that it only returns true for the last item in each series.

[Siniz]

That is a very good idea. Why didn't I think of that. Thanks!

Edit: Having a hard time figuring out how to do this. Any hints? I am guessing I should edit the else to check for the size of my dataset and return true only if it "int item" equals the datasetsize-1, I'm just not sure how to do that. Got any clues?

[skunk]

Did you try something like this?

Code: Select all

plot.setRenderer(new XYLineAndShapeRenderer() {
    public boolean getItemShapeVisible(int series, int item) {
        return (item == getPlot().getDataset().getItemCount(series) - 1);
    }
});

As written, this will only work on the primary dataset.

[Siniz]

That worked like a charm! Thanks a lot skunk. Learning a lot