How to make square shape point in step chart for a value

[reach2kanchan]

Hi,
I have used XYStepRenderer for create the following step chart.

Code: Select all

 XYStepRenderer sxyir = new XYStepRenderer();

I have faced a problem.I want to highlight the point with the square shape whenever i got a value in a specific time.
Suppose in this graph i have got value 9 at 07:19:57 AM and again got 10 at 08:21:47 AM.
Now i need to highlight those points with a square shape point.
please help me by giving suggestion.

Thanks

[david.gilbert]

There's a few options:

(1) Modify the renderer to display shapes (I didn't write this renderer, but I think it should be easy enough to add shapes back in, because it subclasses XYLineAndShapeRenderer);

(2) Overlay the points by adding a second dataset (a clone of the first) and renderer to the plot.

(3) Use plot annotations to highlight the points (e.g. XYShapeAnnotation).