How to you remove all chart margins?

[ksevern]

I'd like to know how to remove all the chart margins. I've had some success getting rid of most of them (see the code below) but need help removing the spaces indicated in this image

Please help.

Thanks,
Ken

Code Segment:
______________________________

JFreeChart jfChart = ChartFactory.createLineChart(
null,
null,
null,
jfDataSet,
PlotOrientation.VERTICAL,
false,
false,
false
);

// Customize the chart
jfChart.setBackgroundPaint(Color.WHITE);
jfChart.setAntiAlias(true);
jfChart.setBorderPaint(Color.WHITE);
jfChart.setBorderVisible(false);

// Customize the plot
CategoryPlot plot = jfChart.getCategoryPlot();
plot.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 0, 0, 0, 0));
plot.setDataAreaRatio(1.0);

// Had to set the paint to white to get rid of this line.
plot.setOutlinePaint(Color.WHITE);



// customize the domain axis...
CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setVisible(false);
domainAxis.setUpperMargin(0);
domainAxis.setLowerMargin(0);

// customize the range axis
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setVisible(false);
rangeAxis.setAutoRange(true);
rangeAxis.setAutoRangeIncludesZero(false);
rangeAxis.setUpperMargin(0);
rangeAxis.setLowerMargin(0);

[david.gilbert]

The category axis has allocated space for each category, with no gaps in between categories...but since the data points are drawn in the middle of each category, you'll see a "half a category" gap at the start and another "half a category" gap at the end. Switch to a BarRenderer and you'll see what I mean.

One way to eliminate this gap would be to subclass the CategoryAxis class and override the getCategoryStart(...), getCategoryMiddle(...) and getCategoryEnd(...) methods. If you get this to work and don't mind sharing your code, I'd be interested to add an attribute to the CategoryAxis class that allows the "half category" adjustment to be switched on or off.

[ksevern]

Thanks for the reply!. That makes sence. I can deal with the half category gap because it should move toward 0 as the number of categories increases. However, I've added 20 data points to the image below and it seems that there is still extra space on the edges.

Is there a way to remove that extra gap?

Thanks,
Ken