JFreechart 循环遍历极坐标图扇区 [英] JFreechart Loop through polar chart sectors

问题描述

我有以下代码来循环遍历极坐标图的扇区，但该方法被多次调用，就好像它在循环中一样.我想在绘图的每个扇区上创建一个系列，扇区由轴刻度单位和角度刻度单位定义.当我注释掉 polarDataset.addSeries(new XYSeries("test")) 和这个新系列的 for 循环时，问题消失了，让我相信这可能有问题.这是之前

I have the following code to method loop throug the sectors of a polar plot, but the method is being called several times, as if it was in a loop. I want to create a series on each sectors of the plot, the sector being defines by the axis tick unit and the angle tick unit. When I comment out the polarDataset.addSeries(new XYSeries("test")) and the for loop for this new series, the problem disappears, making me believe there might be something up with this. This is a continuation of a question posted earlier

有人可以向我解释为什么它一直循环吗?为什么创建的系列数不等于图表上的扇区数?

Can someone please explain to me why it keeps looping? And why the number of series created is not equivalent to the number of sectors on the chart?

int intSeries = 0;
public void createSeriesOnSectors() {
    for (int r = 0; r <= plot.getMaxRadius(); r += ((NumberAxis) plot
            .getAxis()).getTickUnit().getSize()) {
        for (int i = 0; i <= 360; i += plot.getAngleTickUnit()
                .getSize()) {
            dataset.addSeries(new XYSeries("test"));
            intSeries++;

            for (int e = i; e < i+ plot.getAngleTickUnit().getSize(); e++) {
                dataset.getSeries(polarDataset.getSeriesCount() - 1).add(90 - e, r- ((NumberAxis) plot.getAxis()).getTickUnit().getSize());
                }
        }
    }System.out.println("The number of sec is : " + intSeries);
}

因此，我编辑了 trachGod 的示例以实现 ChartProgressListener.我还将 XYSeriesCollection 设为全局变量，并在 chartprogess 方法中添加了以下代码:

So, I edited trachGod's example to get implement the ChartProgressListener. I also made XYSeriesCollection a global variable and added the following code in the chartprogess method:

for (int i = 0; i < 6; i++) {
        XYSeries seriesy = new XYSeries(i + "π/8 " + "< θ < 2π+" + i + "π/8");
        for (int t = 0; t <= 1 * 360; t++) {
            seriesy.add(90 - t - i * 45, t);
        }
        result.addSeries(seriesy);
    }

但仍然添加了比所需更多的系列.任何帮助总是非常感谢.

But more series than required are still added. Any help is always much appreciated.

完整代码:

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.event.ChartProgressEvent;
import org.jfree.chart.event.ChartProgressListener;
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 tests extends JFrame implements ChartProgressListener {

    private static final String title = "Archimedes' Spiral";
    public static XYSeriesCollection result;

    public tests(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() {
        result = new XYSeriesCollection();
        XYSeries series = new XYSeries(title);
        XYSeries series2 = new XYSeries(title);
        for(int i = 90; i<180; i++){
            series2.add(90-i, 200);
            series2.add(90-i, 0);
        }
        result.addSeries(series);
        result.addSeries(series2);
        return result;
    }

    private 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 renderers = new DefaultPolarItemRenderer();
        for (int i = 0; i < dataset.getSeriesCount(); i++) {
            renderers.setSeriesFilled(i, true);
        }
        plot.setRenderer(renderers);
        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, true);
        chart.setBackgroundPaint(Color.white);
        chart.addProgressListener(this);
        return chart;
    }


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

    @Override
    public void chartProgress(ChartProgressEvent e) {
        if (e.getType() == ChartProgressEvent.DRAWING_FINISHED) {
            JFreeChart chart = e.getChart();
            draw();
        }
    }

    public void draw(){
        for (int i = 0; i < 6; i++) {
            XYSeries seriesy = new XYSeries(i + "π/8 " + "< θ < 2π+" + i + "π/8");
            for (int t = 0; t <= 1 * 360; t++) {
                seriesy.add(90 - t - i * 45, t);
            }
            result.addSeries(seriesy);
        }
    }
}

推荐答案

看起来您在每次迭代中都添加了所有六个螺旋.这是我对您的 sscce 的变体.

It looks like you were adding all six spirals on each iteration. Here's my variation on your sscce.

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.event.ChartProgressEvent;
import org.jfree.chart.event.ChartProgressListener;
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 tests extends JFrame implements ChartProgressListener {

    private static final String title = "Archimedes' Spirals";
    private XYSeriesCollection result = new XYSeriesCollection();
    private DefaultPolarItemRenderer renderers = new DefaultPolarItemRenderer();
    private int i;

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

    private 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 < 2π; +iπ/8");
        setFilled(dataset);
        plot.setRenderer(renderers);
        JFreeChart chart = new JFreeChart(
            title, JFreeChart.DEFAULT_TITLE_FONT, plot, true);
        chart.setBackgroundPaint(Color.white);
        chart.addProgressListener(this);
        return chart;
    }

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

    @Override
    public void chartProgress(ChartProgressEvent e) {
        if (e.getType() == ChartProgressEvent.DRAWING_FINISHED) {
            System.out.println(e);
            JFreeChart chart = e.getChart();
            draw();
        }
    }

    public void draw() {
        if (i < 8) {
            XYSeries series = new XYSeries(i + "π/8 " + "< θ < 2π+" + i + "π/8");
            for (int t = 0; t <= 1 * 360; t++) {
                series.add(90 - t - i * 45, t);
            }
            result.addSeries(series);
            setFilled(result);
            i++;
        }
    }

    private void setFilled(XYDataset dataset) {
        for (int i = 0; i < dataset.getSeriesCount(); i++) {
            renderers.setSeriesFilled(i, true);
        }
    }
}

这篇关于JFreechart 循环遍历极坐标图扇区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！