Need advice on customizing XYBarRenderer

[Commander Salamander]

Hello,

I have the developer's guide, and with its assistance I was able to extend XYBarRenderer and override the drawItem() method to suit some of my needs. However, I'm still a bit unsure of the best way to achieve the type of display I require, and I could use some advice.

I have a dynamic plot in which the domain axis is an integer number axis (e.g. 1-1,000,000). Each dataset contains a series of XY values (i.e. not an interval dataset), and I would like to display each XY pair as a bar originating from the Y=0 axis. This much can be accomplished by simply setting my XYPlot renderer to XYBarRenderer. However, I require two additional behaviors:

[1] If multiple XYSeries contain a data point at a given X-value, I need to be able to display the bars side-by-side so they don't occlude each other (or implement a form of stacking that adjusts the paint order so that the bars are painted in order of smallest to largest)

[2] If the user zooms in/out on the x-axis, I would like to adjust the width of the rendered bar (which I'm currently doing with a clumsy override of drawItem()

Any advice on how to approach this would be much appreciated...

Thanks!

[david.gilbert]

I think the ClusteredXYBarRenderer will solve your first problem. The second is trickier, because the bar widths are determined by the x-interval coming from the dataset. You can modify drawItem() to determine the bar width more dynamically...but what is the rule you are using to determine the bar width?

[Commander Salamander]

Thanks for the reply David. I will give the ClusteredXYBarRenderer a try.

but what is the rule you are using to determine the bar width?

Because the bars tend to be spaced at roughly increments of 100 along my giant X-axis, I'm scaling them based on the span of the visible x-axis. Anyway, it isn't too important .

P.S. JFreeChart is terrific... thanks for the great resource!