如何用JFreeChart画半透明图

Question

找到了， plot.setForegroundAlpha(0.6F);

Answer 1

CategoryPlot plot = chart.getCategoryPlot();        // set the stroke for each series...
        plot.getRenderer().setSeriesStroke(0, new BasicStroke(2.0f,
                                                              BasicStroke.CAP_ROUND,
                                                              BasicStroke.JOIN_ROUND,
                                                              1.0f,
                                                              new float[] { 10.0f, 6.0f },
                                                              0.0f));
        plot.getRenderer().setSeriesStroke(1, new BasicStroke(2.0f,
                                                              BasicStroke.CAP_ROUND,
                                                              BasicStroke.JOIN_ROUND,
                                                              1.0f,
                                                              new float[] { 6.0f, 6.0f },
                                                              0.0f));
        plot.getRenderer().setSeriesStroke(2, new BasicStroke(2.0f,
                                                              BasicStroke.CAP_ROUND,
                                                              BasicStroke.JOIN_ROUND,
                                                              1.0f,
                                                              new float[] { 2.0f, 6.0f },
                                                              0.0f));