我目前正在开发一个使用 JFreeChart 来显示箱线图的基于 java 的项目。
我的问题是如何显示包含大约 20 个类别和 5 个以上系列的 CategoryDataset 的箱线图的图表。
目前,如果未设置 ChartPanel 的首选大小,则图例、标签和注释是可读的,但箱线图太小。或者设置 ChartPanel 的大小,使箱线图具有可接受的大小,但随后图例、标签和注释被水平拉伸。
我的问题是,如何在不缩放图表的图例、轴标签和注释的情况下正确缩放箱线图?是否可以在不缩放图表的所有元素的情况下缩放绘图?
代码示例
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<Double> values = createSampleData();
ArrayList<String> categories = createSampleCategories();
for (int i=0;i<=5;i++){
for (String category : categories){
dataset.add(values,i,category);
}
}
return dataset;
}
private ArrayList<String> createSampleCategories() {
ArrayList<String> tmp = new ArrayList<String>();
for (int i=0;i<=20;i++){
tmp.add("Category"+i);
}
return tmp;
}
private ArrayList<Double> createSampleData() {
ArrayList<Double> tmp = new ArrayList<Double>();
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();
}
}