java - 自定义 JFreeChart 标题字体太小

Question

我正在尝试使用以下代码为 JFreeChart 中的标题设置自定义Font:

    InputStream is = new FileInputStream("test.ttf");
    java.awt.Font customFont = java.awt.Font.createFont(java.awt.Font.TRUETYPE_FONT, is);
    customFont.deriveFont(24f);
    chart.getTitle().setFont(customFont);

最终的标题字体非常小(几乎看不见):

有什么想法如何将自定义Font添加到JFreeChart标题吗？

public class Function2DDemo1 extends ApplicationFrame {

    public Function2DDemo1(String title) {
        super(title);
        JPanel chartPanel = createDemoPanel();
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);
    }

    private static JFreeChart createChart(XYDataset dataset) {
        // create the chart...
        JFreeChart chart = ChartFactory.createXYLineChart("Function2DDemo1 ", // chart
                                                                                // title
        "X", // x axis label
        "Y", // y axis label
        dataset, // data
        PlotOrientation.VERTICAL, true, // include legend
        true, // tooltips
        false // urls
        );

        // SET A CUSTOM TITLE FONT
        try {
            InputStream is = new FileInputStream("test.ttf");
            java.awt.Font customFont = java.awt.Font.createFont(java.awt.Font.TRUETYPE_FONT, is);
            customFont.deriveFont(24f);
            chart.getTitle().setFont(customFont);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (FontFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        XYPlot plot = (XYPlot) chart.getPlot();
        plot.getDomainAxis().setLowerMargin(0.0);
        plot.getDomainAxis().setUpperMargin(0.0);
        return chart;
    }

    public static XYDataset createDataset() {
        XYDataset result = DatasetUtilities.sampleFunction2D(new X2(), -4.0, 4.0, 40, "f(x)");
        return result;
    }

    public static JPanel createDemoPanel() {
        JFreeChart chart = createChart(createDataset());
        return new ChartPanel(chart);
    }

    static class X2 implements Function2D {

        public double getValue(double x) {
            return x * x + 2;
        }

    }

    public static void main(String[] args) {
        Function2DDemo1 demo = new Function2DDemo1("JFreeChart: Function2DDemo1.java");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }
}

Answer 1

deriveFont 方法返回您忘记存储的 Font 对象。将代码更改为:

customFont = customFont.deriveFont(24f);

我通过此修复测试了您的代码，使用 http://www.urbanfonts.com 中的免费字体它似乎工作得很好(在 Windows 上)。我的猜测是，当您加载字体文件时，默认大小是 1。