我目前正在使用JFreeChart來創建一個基于java的項目來顯示箱圖.

我的問題是如何顯示包含大約20個類別和5系列的CategoryDataset的箱圖的圖表.

目前,如果未設置ChartPanel的首選大小,則圖例,標簽和注釋可讀,但Boxplots太小.或者設置ChartPanel的大小,以便Boxplots具有可接受的大小,但隨后圖例,標簽和注釋被水平拉伸.

我的問題是,如何在不縮放圖表的軸標簽和注釋的情況下正確縮放箱圖？是否可以在不縮放圖表的所有元素的情況下縮放繪圖？

代碼示例

import java.awt.Color;

import java.awt.Dimension;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.CategoryAxis;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.renderer.category.BoxAndWhiskerRenderer;

import org.jfree.data.statistics.DefaultBoxAndWhiskerCategoryDataset;

public class StretchedBoxAndWhiskerExample{

DefaultBoxAndWhiskerCategoryDataset dataset;

JFreeChart chart;

ChartPanel chartPanel;

JFrame frame;

JScrollPane scrollPane;

public StretchedBoxAndWhiskerExample() {

createCategoryBoxplot();

frame = new JFrame();

scrollPane = new JScrollPane(chartPanel);

scrollPane.setPreferredSize(new Dimension(800,700));

scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

frame.add(scrollPane);

frame.pack();

frame.setVisible(true);

}

private void createCategoryBoxplot(){

dataset = createCategoryDataset();

CategoryAxis xAxis = new CategoryAxis("");

NumberAxis yAxis = new NumberAxis("Score");

BoxAndWhiskerRenderer renderer = new BoxAndWhiskerRenderer();

CategoryPlot plot = new CategoryPlot(dataset, xAxis, yAxis, renderer);

createJFreeChart(plot,"Test");

// Design

renderer.setFillBox(false);

renderer.setMeanVisible(false);

chart.setBackgroundPaint(Color.white);

plot.setBackgroundPaint(Color.lightGray);

plot.setDomainGridlinePaint(Color.white);

plot.setDomainGridlinesVisible(true);

plot.setRangeGridlinePaint(Color.white);

plot.getRangeAxis().setRange(-10.5, 10.5);

chartPanel = new ChartPanel(chart);

chartPanel.setPreferredSize(new Dimension(3250,600));

}

private DefaultBoxAndWhiskerCategoryDataset createCategoryDataset() {

dataset = new DefaultBoxAndWhiskerCategoryDataset();

ArrayList values = createSampleData();

ArrayList categories = createSampleCategories();

for (int i=0;i<=5;i++){

for (String category : categories){

dataset.add(values,i,category);

}

}

return dataset;

}

private ArrayList createSampleCategories() {

ArrayList tmp = new ArrayList();

for (int i=0;i<=20;i++){

tmp.add("Category"+i);

}

return tmp;

}

private ArrayList createSampleData() {

ArrayList tmp = new ArrayList();

for (int i=0;i<10;i++){

tmp.add(5.0);

tmp.add(7.0);

tmp.add(2.0);

tmp.add(4.0);

}

return tmp;

}

private void createJFreeChart(CategoryPlot plot, String title){

chart = new JFreeChart(title, plot);

}

public static void main(String[] args) throws IOException {

StretchedBoxAndWhiskerExample demo = new StretchedBoxAndWhiskerExample();

}

}

解決方法:

設置包含ChartPanel的首選大小,而不是圖表,如圖here和here所示.

附錄：我不認為您可以有用地將圖表添加到滾動窗格.相反,創建一個類似于SlidingCategoryDataset的類來實現BoxAndWhiskerCategoryDataset.將滾動條添加到控制第一個顯示索引的框架.

附錄：一種不那么雄心勃勃的方法就是使用一些合適的控件來分頁數據集的一部分,如下例所示.

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.event.ActionEvent;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import java.util.Random;

import javax.swing.AbstractAction;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import org.jfree.chart.ChartPanel;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.CategoryAxis;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.renderer.category.BoxAndWhiskerRenderer;

import org.jfree.data.statistics.DefaultBoxAndWhiskerCategoryDataset;

/** @see https://stackoverflow.com/questions/6844759 */

public class BoxAndWhiskerDemo {

private static final int COLS = 20;

private static final int VISIBLE = 4;

private static final int ROWS = 5;

private static final int VALUES = 10;

private static final Random rnd = new Random();

private List columns;

private List>> data;

private DefaultBoxAndWhiskerCategoryDataset dataset;

private CategoryPlot plot;

private ChartPanel chartPanel;

private JPanel controlPanel;

private int start = 0;

public BoxAndWhiskerDemo() {

createData();

createDataset(start);

createChartPanel();

createControlPanel();

}

private void createData() {

columns = new ArrayList(COLS);

data = new ArrayList>>();

for (int i = 0; i < COLS; i++) {

String name = "Category" + String.valueOf(i + 1);

columns.add(name);

List> list = new ArrayList>();

for (int j = 0; j < ROWS; j++) {

list.add(createValues());

}

data.add(list);

}

}

private List createValues() {

List list = new ArrayList();

for (int i = 0; i < VALUES; i++) {

list.add(rnd.nextGaussian());

}

return list;

}

private void createDataset(int start) {

dataset = new DefaultBoxAndWhiskerCategoryDataset();

for (int i = start; i < start + VISIBLE; i++) {

List> list = data.get(i);

int row = 0;

for (List values : list) {

String category = columns.get(i);

dataset.add(values, "s" + row++, category);

}

}

}

private void createChartPanel() {

CategoryAxis xAxis = new CategoryAxis("Category");

NumberAxis yAxis = new NumberAxis("Value");

BoxAndWhiskerRenderer renderer = new BoxAndWhiskerRenderer();

plot = new CategoryPlot(dataset, xAxis, yAxis, renderer);

JFreeChart chart = new JFreeChart("BoxAndWhiskerDemo", plot);

chartPanel = new ChartPanel(chart);

}

private void createControlPanel() {

controlPanel = new JPanel();

controlPanel.add(new JButton(new AbstractAction("\u22b2Prev") {

@Override

public void actionPerformed(ActionEvent e) {

start -= VISIBLE;

if (start < 0) {

start = 0;

return;

}

createDataset(start);

plot.setDataset(dataset);

}

}));

controlPanel.add(new JButton(new AbstractAction("Next\u22b3") {

@Override

public void actionPerformed(ActionEvent e) {

start += VISIBLE;

if (start > COLS - VISIBLE) {

start = COLS - VISIBLE;

return;

}

createDataset(start);

plot.setDataset(dataset);

}

}));

}

public ChartPanel getChartPanel() {

return chartPanel;

}

public JPanel getControlPanel() {

return controlPanel;

}

public static void main(String[] args) throws IOException {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

BoxAndWhiskerDemo demo = new BoxAndWhiskerDemo();

frame.add(demo.getChartPanel(), BorderLayout.CENTER);

frame.add(demo.getControlPanel(), BorderLayout.SOUTH);

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

});

}

}

標簽：java,charts,scaling,boxplot,jfreechart

來源： https://codeday.me/bug/20190626/1294947.html

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