JFreeChart BarChart -> NO gradient
my bar chart is always drawn with a gradient color by default. I just want a simple color without any styled effects.
Can anyone help ?
Code:
final JFreeChart chart = ChartFactory.createBarChart(
"", // chart title
xLabel, // domain axis label
yLabel, // range axis label
dataset, // data
PlotOrientation.VERTICAL, // orientation
true, // include legend
false, // tooltips?
false // URLs?
);
final CategoryPlot plot = chart.getCategoryPlot();
// SOMETHING HAS TO BE DONE HERE
showChart(chart); // Simply shows the chart in a new window
Thanks
The problem lies in the BarPainter
you are using. The JFreeChart version 1.0.13 default is to use GradientBarPainter
which adds a metallic-ish look to the bar. If you want the "old" look the solution is to use the StandardBarPainter
.
final CategoryPlot plot = chart.getCategoryPlot();
((BarRenderer) plot.getRenderer()).setBarPainter(new StandardBarPainter());
That should do it.
Alternatively, if you want use JFreeChart's BarRenderer
, you could force it to use the StandardBarPainter
by calling the static method setDefaultBarPainter()
before initializing your renderer.
final CategoryPlot plot = chart.getCategoryPlot();
BarRenderer.setDefaultBarPainter(new StandardBarPainter());
((BarRenderer) plot.getRenderer()).setBarPainter(new BarPainter());
If you want more control of the chart you can always build it from the ground up instead of using ChartFactory
, but that does require a lot extra code.
Before you create the chart from ChartFactory you can set the chart theme:
ChartFactory.setChartTheme(StandardChartTheme.createLegacyTheme());
The default is the JFreeTheme which adds the gradient. The following themes are available:
ChartFactory.setChartTheme(StandardChartTheme.createJFreeTheme());
ChartFactory.setChartTheme(StandardChartTheme.createDarknessTheme());
The source code for an older version of org.jfree.chart.demo.BarChartDemo1
shows how to set the series colors. Just specify plain colors instead of gradients.
renderer.setSeriesPaint(0, Color.red);
renderer.setSeriesPaint(1, Color.green);
renderer.setSeriesPaint(2, Color.blue);
Correction: The key to @Jes's helpful answer may be found in the initialization of defaultBarPainter
in BarRenderer
.