JFreeChart - 将图表线的 SeriesStroke 从实线更改为虚

问题描述

这里接受的答案(JFreechart(Java) - 如何绘制部分虚线和部分实线的线条?) 帮助我开始改变图表上的系列笔划线.在单步执行我的代码并观察更改后，我看到我的系列笔画实际上在它应该更改为dashedStroke"时(在某个日期dashedAfter"之后)，但是当图表呈现时，整个系列线是虚线.如何让系列线一开始是实线，在设定的日期之后是虚线?

The answer accepted here (JFreechart(Java) - How to draw lines that is partially dashed lines and partially solid lines?) helped me start down the path of changing my seriesstroke lines on my chart. After stepping through my code and watching the changes, I see that my seriesstroke does in fact change to "dashedStroke" when it is supposed to (after a certain date "dashedAfter"), but when the chart is rendered the entire series line is dashed. How can I get a series line to be drawn solid at first and dashed after a set date?

/* series line modifications */
final Number dashedAfter = timeNowDate.getTime();

XYLineAndShapeRenderer render = new XYLineAndShapeRenderer() {
  Stroke regularStroke = new BasicStroke();
  Stroke dashedStroke = new BasicStroke(
                            1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND,
                            1.0f, new float[] {10.0f, 6.0f}, 0.0f );
  @Override
  public Stroke getItemStroke(int row, int column) {
    Number xVal = cd.getXValue(row, column);
    if (xVal.doubleValue() > dashedAfter.doubleValue()) { 
      return dashedStroke; 
    } else { 
      return regularStroke; 
    }
  }
};
render.setBaseShapesVisible(false);
render.setBaseShapesFilled(true);
render.setDrawSeriesLineAsPath(true);
plot.setRenderer(render);

推荐答案

你试过实现AbstractRenderer#getItemStroke吗?

在这个例子中，我对系列​​ 2 使用 x > 4 的虚线:

In this example I'm using a dashed line for x > 4 for series 2:

XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(){
    Stroke soild = new BasicStroke(2.0f);
    Stroke dashed =  new BasicStroke(1.0f,BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, new float[] {10.0f}, 0.0f);
    @Override
    public Stroke getItemStroke(int row, int column) {
if (row == 2){
  double x = dataset.getXValue(row, column);
  if ( x > 4){
    return dashed;
  } else {
    return soild;
  } 
} else
  return super.getItemStroke(row, column);
    }
  };
  renderer.setBaseShapesVisible(true);
  renderer.setBaseShapesFilled(true);
  renderer.setBaseStroke(new BasicStroke(3));
  plot.setRenderer(renderer);

虽然此示例使用的是 XYSeries 而不是您应该能够根据需要对其进行修改的日期.

Although this example is using and XYSeries and not dates you shold be able to modify it for you needs.

这是完整的例子

import java.awt.BasicStroke;
import java.awt.Stroke;

import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class LineChartDemo2 extends ApplicationFrame {

    public LineChartDemo2(String title) {
        super(title);
        JPanel chartPanel = createDemoPanel();
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);
    }

    private static JFreeChart createChart(final XYDataset dataset) {

        JFreeChart chart = ChartFactory.createXYLineChart(
            "Line Chart Demo: XYLineAndShapeRenderer",     
            "X",                     
            "Y",                     
            dataset,              
            PlotOrientation.VERTICAL,
            false,                     
            false,                 
            false             
        );

        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setDomainPannable(true);
        plot.setRangePannable(true);

        XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(){
            Stroke soild = new BasicStroke(2.0f);
            Stroke dashed =  new BasicStroke(1.0f,BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, new float[] {10.0f}, 0.0f);
            @Override
            public Stroke getItemStroke(int row, int column) {
                if (row == 2){
                    double x = dataset.getXValue(row, column);
                    if ( x > 4){
                        return dashed;
                    } else {
                        return soild;
                    } 
                } else
                    return super.getItemStroke(row, column);
            }
        };

        renderer.setBaseShapesVisible(true);
        renderer.setBaseShapesFilled(true);
        renderer.setBaseStroke(new BasicStroke(3));
        plot.setRenderer(renderer);
        return chart;
    }

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

    public static void main(String[] args) {
        LineChartDemo2 demo = new LineChartDemo2(
                "JFreeChart");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }

    private static XYDataset createDataset() {

        XYSeries series1 = new XYSeries("First");
        series1.add(1.0, 1.0);
        series1.add(2.0, 4.0);
        series1.add(3.0, 3.0);
        series1.add(4.0, 5.0);
        series1.add(5.0, 5.0);
        series1.add(6.0, 7.0);
        series1.add(7.0, 7.0);
        series1.add(8.0, 8.0);

        XYSeries series2 = new XYSeries("Second");
        series2.add(1.0, 5.0);
        series2.add(2.0, 7.0);
        series2.add(3.0, 6.0);
        series2.add(4.0, 8.0);
        series2.add(5.0, 4.0);
        series2.add(6.0, 4.0);
        series2.add(7.0, 2.0);
        series2.add(8.0, 1.0);

        XYSeries series3 = new XYSeries("Third");
        series3.add(3.0, 4.0);
        series3.add(4.0, 3.0);
        series3.add(5.0, 2.0);
        series3.add(6.0, 3.0);
        series3.add(7.0, 6.0);
        series3.add(8.0, 3.0);
        series3.add(9.0, 4.0);
        series3.add(10.0, 3.0);

        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series1);
        dataset.addSeries(series2);
        dataset.addSeries(series3);

        return dataset;

    }


}

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