时间序列图，X轴刻度标签变为

Question

我正在使用JFreeChart制作一个条形图与时间。由于某些原因，在这些图表上，x轴上的刻度标签变为“…”偶尔地似乎有足够的空间来扩展标签，但它只是切断了整个事情。我怎样才能解决这个问题。

我试着用图片按钮上传一张图片，但它似乎不起作用。

下面是与我的项目设置相似的代码。奇怪的是，它的行为不同于我的建筑。在我的上面，不是说“侯......”，而是说“......”。请忽略评论和所有其他未编辑的东西。

package dataDisplay;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.sql.SQLException;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

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.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.chart.renderer.category.LineAndShapeRenderer;
import org.jfree.data.category.DefaultCategoryDataset;

public class mockTest extends JPanel{

    ChartPanel chartPanel;
    JFreeChart chart;
    CategoryAxis domainAxis;
    NumberAxis rangeAxis;

    public mockTest()
    {
        //Mock data
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        int[] times = new int[]{1,2,3,4,5,6,7,8,9,10,11,12};

        for ( int i = 0; i < times.length; i++ ){
            dataset.addValue(times[i], "Time", "Houreee" + String.valueOf(i+1));;

        }
        CategoryPlot plot = new CategoryPlot();

        //create the plot

        //add the first dataset, and render as bar values
        CategoryItemRenderer renderer = new BarRenderer();
        plot.setDataset(0,dataset);
        plot.setRenderer(0,renderer);  

        //set axis 
         domainAxis = new CategoryAxis("Time");  
        rangeAxis = new NumberAxis("Value"); 

        plot.setDomainAxis(0,domainAxis);
        plot.setRangeAxis(rangeAxis);
        chart = new JFreeChart(plot);
        chartPanel = new ChartPanel( chart ); 

           this.addComponentListener(new ComponentAdapter() {
                @Override
                /**
                 *  Makes it so it does not stretch out text. Resizes the fonts to scale with the screen width..
                 */
                public void componentResized(ComponentEvent e) {
                    chartPanel.setMaximumDrawHeight(e.getComponent().getHeight());
                    chartPanel.setMaximumDrawWidth(e.getComponent().getWidth());
                    chartPanel.setMinimumDrawWidth(e.getComponent().getWidth());
                    chartPanel.setMinimumDrawHeight(e.getComponent().getHeight());

                    // Makes the font size scale according to the width of the chart panel.
                    rangeAxis.setLabelFont(new Font("SansSerif", Font.PLAIN,e.getComponent().getWidth()/60));
                    domainAxis.setTickLabelFont(new Font("SansSerif", Font.PLAIN,e.getComponent().getWidth()/80));
                    rangeAxis.setTickLabelFont(new Font("SansSerif", Font.PLAIN,e.getComponent().getWidth()/75));
                }
            });


        this.add(chartPanel, "Center");
    }   
    public static void main (String[] args) 
    {

        // Get the default toolkit
        Toolkit toolkit = Toolkit.getDefaultToolkit();
        // Get the current screen size 
        Dimension scrnsize = toolkit.getScreenSize();
        int scrnWidth= (int)scrnsize.getWidth();
        int scrnHeight = (int) scrnsize.getHeight();

        JFrame J= new JFrame();
        JPanel jP = new JPanel();
        J.setContentPane(jP);
        J.setSize(scrnWidth, scrnHeight);
        jP.setBackground(Color.white);
        jP.setBounds(0,0,scrnWidth,scrnHeight);
        int xPercent= 50;
        int yPercent = 50;
        int widthPercent=50;
        int heightPercent=43;
        jP.setLayout(null);
        jP.setSize(scrnWidth, scrnHeight);
        mockTest b= new mockTest();


        jP.add(b);
        b.setBounds(new Rectangle((int)(scrnWidth*((double)xPercent/100)),(int)(scrnHeight*((double)yPercent/100)),(int)(scrnWidth*((double)widthPercent/100)),(int)(scrnHeight*((double)heightPercent/100))));
        J.setUndecorated(true);
        J.setVisible(true);




    }

Answer 1

不要使用null布局；让布局管理器完成这项工作。JPanel的默认布局是FlowLayout，它会忽略后续更改。在下面的例子中，

>

避免不必要的嵌套面板。

使用setExtendedState（）最大化帧。

如有必要，使用此处建议的方法之一更改图表的初始大小。

如果您选择更改Font，请使用eriveFont（）来避免用户所选设置中的突然差异。

import java.awt.EventQueue;
import java.awt.GridLayout;
import javax.swing.JFrame;
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.BarRenderer;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.data.category.DefaultCategoryDataset;

/** @see https://stackoverflow.com/a/31014252/230513 */
public class Test {


    public void display() {
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        for (int i = 0; i < 12; i++) {
            dataset.addValue(i, "Time", "Hours" + String.valueOf(i + 1));
        }
        CategoryPlot plot = new CategoryPlot();
        CategoryItemRenderer renderer = new BarRenderer();
        plot.setDataset(0, dataset);
        plot.setRenderer(0, renderer);
        CategoryAxis domainAxis = new CategoryAxis("Time");
        NumberAxis rangeAxis = new NumberAxis("Value");
        plot.setDomainAxis(0, domainAxis);
        plot.setRangeAxis(rangeAxis);
        JFreeChart chart = new JFreeChart(plot);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setLayout(new GridLayout());

        JFrame f = new JFrame();
        f.add(chartPanel);
        f.setExtendedState(f.getExtendedState() | JFrame.MAXIMIZED_BOTH);
        f.setUndecorated(true);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Test()::display);
    }
}