JFreeChart 连接一点到周围的所有其他点 [英] JFreeChart connect one point to all other around

问题描述

是否可以在 JFreeChart 中将一个点连接到周围的所有其他点
在这里它应该看起来如何

is it possible to connect one point to all others around in JFreeChart
here how it should looks

所以周围的所有点都连接到 X 点

so all the points around connected to X point

chart.setBackgroundPaint(Color.white);

        final XYPlot plot = chart.getXYPlot();
        plot.setBackgroundPaint(Color.lightGray);
        plot.setDomainGridlinePaint(Color.white);
        plot.setRangeGridlinePaint(Color.white);

        Shape cross = ShapeUtilities.createDiagonalCross(3, 1);
        Shape somehing = ShapeUtilities.createDiamond(4);



        final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
        renderer.setSeriesLinesVisible(0, false);
        renderer.setSeriesLinesVisible(1, false);
        renderer.setSeriesLinesVisible(2, false);
        renderer.setSeriesLinesVisible(3, false);

        renderer.setSeriesShape(0, cross);
        renderer.setSeriesShape(1, somehing);
        renderer.setSeriesShape(2, somehing);
        renderer.setSeriesShape(3, somehing);

        renderer.setSeriesPaint(0, Color.RED);
        renderer.setSeriesPaint(1, Color.BLUE);
        renderer.setSeriesPaint(2, Color.YELLOW);
        renderer.setSeriesPaint(2, Color.green);
        plot.setRenderer(renderer);


        plot.setBackgroundPaint(Color.BLACK);
        // change the auto tick unit selection to integer units only...
        final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        // OPTIONAL CUSTOMISATION COMPLETED.

        return chart;

谢谢

推荐答案

您需要一个自定义渲染器.这个最小的例子覆盖了 XYLineAndShapeRenderer 方法 drawPrimaryLine().它绘制相对于具有 anchor 作为其系列索引的项目的线条.您需要概括现有的实现，替换下面显示的行.

You'll need a custom renderer. This minimal example overrides the XYLineAndShapeRenderer method drawPrimaryLine(). It draws the lines relative to the item having anchor as its series index. You'll need to recapitulate the existing implementation, replacing the lines shown below.

附录:该示例只是将 anchor 作为构造函数参数传递，但您可以扩展 XYDataset 以包含每个系列的唯一值.

Addendum: The example simply passes anchor as a constructor parameter, but you can extend XYDataset to include a unique value for each series.

MyRenderer r = new MyRenderer(8);
XYPlot plot = new XYPlot(dataset, new NumberAxis("X"), new NumberAxis("Y"), r);
JFreeChart chart = new JFreeChart(plot);
…
private static class MyRenderer extends XYLineAndShapeRenderer {

    private final int anchor;

    public MyRenderer(int acnchor) {
        this.anchor = acnchor;
    }

    @Override
    protected void drawPrimaryLine(XYItemRendererState state, Graphics2D g2,
        XYPlot plot, XYDataset dataset, int pass, int series, int item,
        ValueAxis domainAxis, ValueAxis rangeAxis, Rectangle2D dataArea) {
        if (item == anchor) {
            return;
        }
        …
        double x0 = dataset.getXValue(series, anchor);
        double y0 = dataset.getYValue(series, anchor);
        …
    }
}

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