JFree图表选择性点厚度

Question

我正在使用jfree图表以图形方式显示指标。现在我正在研究一种解决方案，它将XY线图中的图形元素随机化，以使图形看起来更平滑。问题是我不希望随机元素获得与真实相同的厚度值，实际上我不会有任何与它们相关的厚度。有没有办法有选择地指定点厚度。我目前正在使用XYLineAndShapeRenderer来渲染点厚度。

Answer 1

You can override getItemShapeVisible() and arrange for it to return false for the spurious points. You can store the extra information required for the decision in your data model using an implementation of XYZDataset .

As an alternative, consider smoothing the data before rendering it. Such filters typically result in fewer points, which simplifies rendering.

In either case, avoid confusing or misleading changes to the data. A TextTitle , shown here , may clarify the result.

Addendum: getItemShapeVisible() tells you what series and item is under consideration. The default implementation simply asks getSeriesShapesVisible() . Here's an outline:

private static class MyRenderer extends XYLineAndShapeRenderer {

    @Override
    public boolean getItemShapeVisible(int series, int item) {
        System.out.println(series + ":" + item);
        if (item % 2 == 0) return false;
        else return super.getItemShapeVisible(series, item);
    }
}

Addendum: Here's how you might install it:

XYPlot plot = chart.getXYPlot();
MyRenderer renderer = new MyRenderer();
plot.setRenderer(renderer);