我正在尝试使用 JFreeChart 创建图形,但它没有正确绘制线条。它不是按照我放置它们的顺序连接点,而是按照它们的 x 值的顺序连接点。我正在使用 ChartFactory.createScatterPlot 创建绘图,并使用 XYLineAndShapeRenderer 将线条设置为可见。
/编辑:sscce:
package test;
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;
public class PlotTest {
private XYSeriesCollection dataset;
public static void main (String[] args) {
new PlotTest();
}
public PlotTest () {
dataset = new XYSeriesCollection();
XYSeries data = new XYSeries("data");
data.add(3, 2); //Point 1
data.add(1, 1); //Point 2
data.add(4, 1); //Point 3
data.add(2, 2); //Point 4
dataset.addSeries(data);
showGraph();
}
private void showGraph() {
final JFreeChart chart = createChart(dataset);
final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
final ApplicationFrame frame = new ApplicationFrame("Title");
frame.setContentPane(chartPanel);
frame.pack();
frame.setVisible(true);
}
private JFreeChart createChart(final XYDataset dataset) {
final JFreeChart chart = ChartFactory.createScatterPlot(
"Title", // chart title
"X", // x axis label
"Y", // y axis label
dataset, // data
PlotOrientation.VERTICAL,
true, // include legend
true, // tooltips
false // urls
);
XYPlot plot = (XYPlot) chart.getPlot();
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
renderer.setSeriesLinesVisible(0, true);
plot.setRenderer(renderer);
return chart;
}
}
现在我希望程序按 1-2-3-4 的顺序连接点,这是我将它们添加到数据集中的顺序。但我确实按 2-4-1-3 的顺序将它们连接起来,按 x 值排序。
最佳答案
试试这个:
final XYSeries data = new XYSeries("data",false);
将此构造函数用于 XYSeries
会禁用自动排序,如 XYSeries API 中所定义.
之前:
之后:
关于java - JFreeChart 散点图线,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5290812/