如何从StackedBarChart(jFreeChart)获取最大Y值? [英] How to get max Y value from StackedBarChart (jFreeChart)?

问题描述

如何从创建的图表中获取最大轴值?

How to get the maximum axis value from a created chart?

创建方式如下:

final JFreeChart chart = ChartFactory.createStackedBarChart("", "", symbol, dataSet,PlotOrientation.VERTICAL, false, false, false);

我可能必须从图表中获取数据集，然后从中获取最大轴值.数据集为DefaultCategoryDataset.

I probably have to get the dataset from the chart and then get the maximum axis value from it. The dataset is DefaultCategoryDataset.

推荐答案

只需遍历CategoryDataset

CategoryDataset dataset = createDataset();
for (int r = 0; r < dataset.getRowCount(); r++) {
    double max = Double.MIN_VALUE;
    for (int c = 0; c < dataset.getColumnCount(); c++) {
        Number number = dataset.getValue(r, c);
        double value = number == null ? Double.NaN : number.doubleValue();
        if (value > max) {
            max = value;
        }
    }
    System.out.println(dataset.getRowKey(r) + ": " + max);
}

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