JFree チャートで線グラフを表示するのですが、点線の出し方がわかりません。
チャート作成時に使っているメソッドはChartFactory.createLineChartです。

JFreeChart chart = ChartFactory.createLineChart(ttlstr, null, null, dataset, PlotOrientation.VERTICAL, true,true,false);
chart.setBackgroundPaint(backcolor);
TextTitle ttl = chart.getTitle();
ttl.setFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,16));

((StandardLegend)chart.getLegend()).setItemFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,16));
((StandardLegend)chart.getLegend()).setTitleFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,16));

CategoryPlot plot = chart.getCategoryPlot();
plot.setRangeGridlinesVisible(true);
plot.setDomainGridlinesVisible(true);

LineAndShapeRenderer renderer0 = (LineAndShapeRenderer)plot.getRenderer(0);
setPaint(renderer0, _iscust);

CategoryAxis axis = plot.getDomainAxis();
axis.setTickLabelFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,12));
axis.setLabelFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,12));
axis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);

ValueAxis axis = plot.getRangeAxis();
axis.setTickLabelFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,12));
axis.setLabelFont(new java.awt.Font("kochi gothic", java.awt.Font.TRUETYPE_FONT,12));

plot.setDatasetRenderingOrder(DatasetRenderingOrder.FORWARD);

どなたか点線の書き方を教えてください。エロイ人、お願いします。