java JFreeChart BarChart -> 无渐变
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JFreeChart BarChart -> NO gradient
提问by shorty
my bar chart is always drawn with a gradient color by default. I just want a simple color without any styled effects.
默认情况下，我的条形图始终使用渐变色绘制。我只想要一个没有任何样式效果的简单颜色。
Can anyone help ?
任何人都可以帮忙吗？
Code:
代码：
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
谢谢
回答by Jes
The problem lies in the BarPainteryou are using. The JFreeChart version 1.0.13 default is to use GradientBarPainterwhich adds a metallic-ish look to the bar. If you want the "old" look the solution is to use the StandardBarPainter.
问题在于BarPainter您正在使用的。JFreeChart 版本 1.0.13 默认使用GradientBarPainter它为条形添加金属外观。如果您想要“旧”外观，解决方案是使用StandardBarPainter.
final CategoryPlot plot = chart.getCategoryPlot();
((BarRenderer) plot.getRenderer()).setBarPainter(new StandardBarPainter());
That should do it.
那应该这样做。
Alternatively, if you want use JFreeChart's BarRenderer, you could force it to use the StandardBarPainterby calling the static method setDefaultBarPainter()before initializing your renderer.
或者，如果您想使用 JFreeChart 的BarRenderer，您可以StandardBarPainter通过setDefaultBarPainter()在初始化渲染器之前调用静态方法来强制它使用。
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.
如果您想要更多地控制图表，您可以随时从头开始构建它，而不是使用ChartFactory，但这确实需要很多额外的代码。
回答by Kazi Islam
Before you create the chart from ChartFactory you can set the chart theme:
在从 ChartFactory 创建图表之前，您可以设置图表主题：
ChartFactory.setChartTheme(StandardChartTheme.createLegacyTheme());
The default is the JFreeTheme which adds the gradient. The following themes are available:
默认是 JFreeTheme，它添加了渐变。以下主题可用：
ChartFactory.setChartTheme(StandardChartTheme.createJFreeTheme());
ChartFactory.setChartTheme(StandardChartTheme.createDarknessTheme());
回答by trashgod
The source codefor an older version of org.jfree.chart.demo.BarChartDemo1shows how to set the series colors. Just specify plain colors instead of gradients.
旧版本的源代码org.jfree.chart.demo.BarChartDemo1显示了如何设置系列颜色。只需指定纯色而不是渐变。
renderer.setSeriesPaint(0, Color.red);
renderer.setSeriesPaint(1, Color.green);
renderer.setSeriesPaint(2, Color.blue);
Correction: The key to @Jes's helpful answermay be found in the initialization of defaultBarPainterin BarRenderer.
更正：关键@赫苏斯乐于助人的答案可以在初始化中找到defaultBarPainter的BarRenderer。
