java jfreechart中的直方图
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histogram in jfreechart
提问by klaus johan
I'm trying to use JfreeChartto create a chart for the histogram of an image , but I don't fully understand how to provide the input data for the histogram .The function I am suppose to use is this:
我正在尝试使用JfreeChart为图像的直方图创建图表，但我不完全了解如何为直方图提供输入数据。我想使用的函数是：
addSeries(java.lang.Comparable key, double[] values, int bins)
I find that documentation is really unclear. I have a 256-element array filled with the number of pixels of each intensity which I want to be able to use as an input, but I don't know how. Has someone encountered this problem before ?
我发现文档真的不清楚。我有一个 256 元素的数组，其中填充了我希望能够用作输入的每个强度的像素数，但我不知道如何使用。以前有人遇到过这个问题吗？
回答by Binary Nerd
Examples loading data into a JFreeChart HistogramDataset:
将数据加载到 JFreeChart HistogramDataset 的示例：
HistogramDataset dataset = new HistogramDataset();
dataset.setType(HistogramType.RELATIVE_FREQUENCY);
dataset.addSeries("H1", double[], 20);
HistogramDataset dataset = new HistogramDataset();
double[] values = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0};
dataset.addSeries("H1", values, 10, 0.0, 10.0);
