JFreeChart的极坐标图形状标注 [英] JFreechart Polar Chart shape annotation

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本文介绍了JFreeChart的极坐标图形状标注的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图用颜色不同颜色的极坐标图的不同区域。例如着色角20和60之间以及在半径2和4之间的区域。
我怎样才能做到这一点？我想用一个形状的注释，并从那里绘制弧形，但似乎没有形状标注为极坐标图。
有任何想法吗？
谢谢

 进口java.awt.Color中;
进口java.awt.Dimension中;
进口的java.util.ArrayList;
进口的java.util.List;
进口javax.swing.JFrame中;
进口org.jfree.chart.ChartPanel;
进口org.jfree.chart.JFreeChart;
进口org.jfree.chart.axis.NumberAxis;
进口org.jfree.chart.axis.NumberTick;
进口org.jfree.chart.axis.ValueAxis;
进口org.jfree.chart.plot.PolarPlot;
进口org.jfree.chart.renderer.DefaultPolarItemRenderer;
进口org.jfree.chart.renderer.PolarItemRenderer;
进口org.jfree.data.xy.XYDataset;
进口org.jfree.data.xy.XYSeries;
进口org.jfree.data.xy.XYSeriesCollection;
进口org.jfree.ui.TextAnchor;公共类test2的扩展JFrame的{    私有静态最后弦乐标题=阿基米德螺旋    公共TEST2（字符串名称）{
        超（职称）;
        JFreeChart的图表= createChart（createDataset（））;
        ChartPanel面板=新ChartPanel（图）
        panel.set preferredSize（新尺寸（500，500））;
        panel.setMouseZoomable（假）;
        this.add（面板）;
    }    私有静态XYDataset createDataset（）{
        XYSeriesCollection结果=新XYSeriesCollection（）;
        XYSeries系列=新XYSeries（职称）;
        XYSeries SER =新XYSeries（测试）;
        对于（INT T = 0; T＆LT; = 1 * 360;吨++）{
            series.add（90  -  T，T）;
        }        对于（INT T = 0; T＆LT; = 1 * 120;吨++）{
            ser.add（90  -  T，40）;
            ser.add（90  -  T，120）;
        }
        result.addSeries（系列）;
        result.addSeries（SER）;
        返回结果;
    }    私有静态的JFreeChart createChart（XYDataset数据集）{
        ValueAxis radiusAxis =新NumberAxis（）;
        radiusAxis.setTickLabelsVisible（假）;
        PolarItemRenderer渲染器=新DefaultPolarItemRenderer（）;
        PolarPlot情节=新PolarPlot（数据集，radiusAxis，渲染器）{            @覆盖
            保护列表refreshAngleTicks（）{
                清单＆LT; NumberTick＆GT;蜱=新的ArrayList＆LT; NumberTick＆GT;（）;
                INT，δ=（int）的this.getAngleTickUnit（）的getSize（）;
                对于（INT T = 0; T＆LT; 360; T + =三角形）{
                    INT TP =（360 + 90  -  T）的360％;
                    NumberTick打勾=新NumberTick（
                        Double.valueOf（吨），将String.valueOf（TP），
                        TextAnchor.CENTER，TextAnchor.CENTER，0.0）;
                    ticks.add（打勾）
                }
                返回蜱;
            }
        };
        plot.setBackgroundPaint（新颜色（0x00f0f0f0））;
        plot.setRadiusGridlinePaint（Color.gray）;
        plot.addCornerTextItem（R（θ）=θ; 0℃;θ＆LT;6π）;
        DefaultPolarItemRenderer仁=新DefaultPolarItemRenderer（）;
        ren.setSeriesFilled（0，真）;
        ren.setSeriesFilled（1，真）;
        plot.setRenderer（仁）;
        JFreeChart的图表=新的JFreeChart（
            标题，JFreeChart.DEFAULT_TITLE_FONT，情节，真正的）;
        chart.setBackgroundPaint（Color.white）;
        返回图;
    }    公共静态无效的主要（字串[] args）{
        test2的演示=新TEST2（职称）;
        demo.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
        demo.pack（）;
        demo.setLocationRelativeTo（NULL）;
        demo.setVisible（真）;
    }
}


解决方案

的<一个href=\"http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/renderer/DefaultPolarItemRenderer.html\"相对=nofollow> DefaultPolarItemRenderer 通常在的 PolarPlot 有方法 setSeriesFilled（），它控制系列是否被填满。渲染器指定 的AlphaComposite .SRC_OVER 为50％的数值模式，所以重叠罢了，显得格外漂亮。

附录：要创建看到下面的图表中，这个启动<一个href=\"http://stackoverflow.com/questions/3458824/jfreechart-polarplot-mathematical-orientation/3467341#3467341\">example并降低数据集的域中的6π在 createDataset到2π​​（）：

 的for（int T = 0; T＆LT; = 1 * 360;吨++）{...

然后进行填充系列createChart（）：

  ...
DefaultPolarItemRenderer渲染器=新DefaultPolarItemRenderer（）;
renderer.setSeriesFilled（0，真）;
...

I am trying to color different region of a polar chart with different colors. e.g coloring the region between the angle 20 and 60 and between the radii 2 and 4. How can I do this? I was thinking of using a shape annotation and from there drawing an arc, but it seems there is no shape annotation for polar plots. Any ideas? Thank you

import java.awt.Color;
import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.NumberTick;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.PolarPlot;
import org.jfree.chart.renderer.DefaultPolarItemRenderer;
import org.jfree.chart.renderer.PolarItemRenderer;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.TextAnchor;

public class test2 extends JFrame {

    private static final String title = "Archimedes' Spiral";

    public test2(String title) {
        super(title);
        JFreeChart chart = createChart(createDataset());
        ChartPanel panel = new ChartPanel(chart);
        panel.setPreferredSize(new Dimension(500, 500));
        panel.setMouseZoomable(false);
        this.add(panel);
    }

    private static XYDataset createDataset() {
        XYSeriesCollection result = new XYSeriesCollection();
        XYSeries series = new XYSeries(title);
        XYSeries ser = new XYSeries("test");
        for (int t = 0; t <= 1 * 360; t++) {
            series.add(90 - t, t);
        }

        for (int t = 0; t <= 1 * 120; t++) {
            ser.add(90 - t, 40);
            ser.add(90 - t, 120);
        }
        result.addSeries(series);
        result.addSeries(ser);
        return result;
    }

    private static JFreeChart createChart(XYDataset dataset) {
        ValueAxis radiusAxis = new NumberAxis();
        radiusAxis.setTickLabelsVisible(false);
        PolarItemRenderer renderer = new DefaultPolarItemRenderer();
        PolarPlot plot = new PolarPlot(dataset, radiusAxis, renderer) {

            @Override
            protected List refreshAngleTicks() {
                List<NumberTick> ticks = new ArrayList<NumberTick>();
                int delta = (int) this.getAngleTickUnit().getSize();
                for (int t = 0; t < 360; t += delta) {
                    int tp = (360 + 90 - t) % 360;
                    NumberTick tick = new NumberTick(
                        Double.valueOf(t), String.valueOf(tp),
                        TextAnchor.CENTER, TextAnchor.CENTER, 0.0);
                    ticks.add(tick);
                }
                return ticks;
            }
        };
        plot.setBackgroundPaint(new Color(0x00f0f0f0));
        plot.setRadiusGridlinePaint(Color.gray);
        plot.addCornerTextItem("r(θ) = θ; 0 < θ < 6π");
        DefaultPolarItemRenderer ren = new DefaultPolarItemRenderer();
        ren.setSeriesFilled(0, true);
        ren.setSeriesFilled(1, true);
        plot.setRenderer(ren);
        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, true);
        chart.setBackgroundPaint(Color.white);
        return chart;
    }

    public static void main(String[] args) {
        test2 demo = new test2(title);
        demo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        demo.pack();
        demo.setLocationRelativeTo(null);
        demo.setVisible(true);
    }
}

解决方案

The DefaultPolarItemRenderer typically used in a PolarPlot has the method setSeriesFilled(), which controls whether a series is filled. The renderer specifies the AlphaComposite.SRC_OVER mode with a value of 50%, so overlapping fills look especially nice.

Addendum: To create the chart seen below, start with this example and reduce the data set's domain from 6π to 2π in createDataset():

for (int t = 0; t <= 1 * 360; t++) { ...

Then make the series filled in createChart():

...
DefaultPolarItemRenderer renderer = new DefaultPolarItemRenderer();
renderer.setSeriesFilled(0, true);
...

这篇关于JFreeChart的极坐标图形状标注的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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