JFreeChart painting Series Area of negative values

[hcardoso]

I have one dataset of

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XYSeriesCollection 

and an

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XYAreaChart 

and it is filled first with the positive values and painted with

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for(int i = 0; i< index;i++){
 chart.getXYPlot().getRenderer().setSeriesPaint(i,Color.RED);                           
}

I then proceed to try and paint the negative values the same way. My problem is that when I paint the area JFreeChart paints it using the integral area paint, meaning it goes from the points in my series and paints it to 0. I need it to paint it from my series to the minimumY that i generate.

Is it possible?

Best Regards

[david.gilbert]

Unfortunately it seems that the renderer is hard-coded to draw the area to the value 0.0:

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double transZero = rangeAxis.valueToJava2D(0.0, dataArea, plot.getRangeAxisEdge());

...so to achieve this you'll need to modify the JFreeChart sources.

[hcardoso]

Meaning i have to create a renderer and override the drawItem method? Can you just give me some pointers on how to do it?

Thank you and best regards

[hcardoso]

One more thing , i have been looking at XYAreaRenderer2 and it seems to do what i want, i think i might have to change a few things. You think it's worth the effort?

Best regards,

[hcardoso]

For those who are interested i did the override on XYAreaRenderer2 drawItem method.

Replaced:

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double transZero = rangeAxis.valueToJava2D( rangeAxis.getLowerBound() , dataArea, plot.getRangeAxisEdge());

Thanks for the help David.

Best regards