Jfreechart - 多个XY图表的任何选项，如多饼图？

Question

有没有类似于multiPiePlot图表但是对于xy图？我有一个应用程序，需要在一个页面上打印两个或三个xy图。我知道您可以在同一个图上放置多个数据集，但要求指定每个数据集必须是同一页面上的单独图表。

Answer 1

是的，只需将您的ChartPanel个实例添加到JPanel GridLayout(0, 1)进行自上而下的安排。此example使用正交GridLayout(1, 0)来设置三个面板。

Answer 2

我使用了使用的解决方案trashgod，但我扩展了解决方案以支持我希望能够对我的应用程序进行的那种打印。

我希望能够像JFreechart一样打印，但是将每个页面上的多个图形放在一个网格中，并使其拉伸并很好地扩展到页面。使用此功能，我能够生成与下图相匹配的打印件：

基本上我扩展了JPanel并实现了Printable接口。制作一个包含我可能想要显示/打印的所有JFreecharts的面板。面板将根据您提供的一些布局说明以网格方式排列它们。

面板的打印功能基本上采用与正常类似的页面格式，但随后将页面划分为之前指定的网格。然后，它将获取每个单元格并为每个单元格生成页面格式。然后它会告诉每个JFreeChart ChartPanel打印到每个PageFormat单元格。

CustomChartPanel：

package com.company.jfreeChartCustom;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.geom.Rectangle2D;
import java.awt.print.PageFormat;
import java.awt.print.Paper;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;
import javax.swing.JPanel;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;

import com.lowagie.text.Row;

/**
 * The CustomChartPanel is used to display/print multiple JFreeCharts
 * Users should only interact with this class with the methods defined
 * below in order to get the proper functionality.  Using
 * inherited methods may produce unwanted display/print behavior if you
 * add components other than JFreeCharts.
 * 
 */
public class CustomChartPanel extends JPanel implements Printable{

    List<JFreeChart> charts = new ArrayList<JFreeChart>();
    List<ChartPanel> panels = new ArrayList<ChartPanel>();
    ChartLayoutInstructions layoutInstructions;

    public CustomChartPanel(){
        super();
    }

    public CustomChartPanel(JFreeChart chart){
        super();
        charts.add(chart);
    }

    /**
     * Creates a CustomChartPanel which displays 1 or more charts in a grid-like fashion
     * described by the layoutInstructions you pass in.  Note that if you pass in more
     * charts than there are columns specified in the ChartLayoutInstructions then excess
     * charts will not be displayed or printed.
     * @param charts
     * @param layoutInstructions
     */
    public CustomChartPanel(List<JFreeChart> charts, ChartLayoutInstructions layoutInstructions){
        super();
        this.layoutInstructions = layoutInstructions;
        for(JFreeChart chart : charts){
            this.charts.add(chart);
        }
        createUIComponents();
    }

    protected void createUIComponents(){
        int size = Math.min(layoutInstructions.getColumns() * layoutInstructions.getRows(), charts.size());
        this.setLayout(new GridLayout(layoutInstructions.getRows(), layoutInstructions.getColumns()));


        for(int i = 0; i < size; i++ ){
            System.err.println("Adding chart");
            ChartPanel chartPanel = new ChartPanel(charts.get(i));
            chartPanel.setMaximumDrawHeight(20000);
            chartPanel.setMinimumDrawHeight(0);
            chartPanel.setMaximumDrawWidth(20000);
            chartPanel.setMinimumDrawWidth(0);
            chartPanel.setPopupMenu(null);
            panels.add(chartPanel);
            this.add(chartPanel);
        }
    }

    public void createPrintJob(){
        PrinterJob job = PrinterJob.getPrinterJob();
        PageFormat pf = job.defaultPage();
        PageFormat pf2 = job.pageDialog(pf);
        if (pf2 != pf) {
            job.setPrintable(this, pf2);
            if (job.printDialog()) {
                try {
                    job.print();
                }
                catch (PrinterException e) {
                    JOptionPane.showMessageDialog(this, e);
                }
            }
        }
    }

    @Override
    public int print(Graphics g, PageFormat pf, int pageIndex)
            throws PrinterException {
        System.err.println("PRINTING");
        //Divide the current page format into sections based
        //on the layout instructions received in the constructor
        //a new pagelayout is created for each cell in the grid
        //that will then be passed along to the print method of
        //each chart panel.  


        if(pageIndex != 0){
            return NO_SUCH_PAGE;
        }

        List<PageFormat> pageFormats = new ArrayList<PageFormat>();

        //setup all the page formats needed for the grid cells.
        double x = pf.getImageableX();
        double y = pf.getImageableY();
        double cellWidth = pf.getImageableWidth() / layoutInstructions.getColumns();
        double cellHeight = pf.getImageableHeight() / layoutInstructions.getRows();

        for(int i=1; i <= layoutInstructions.getRows(); i++){
            double rowOffset = (i-1)*cellHeight + y;
            for(int j=1; j <= layoutInstructions.getColumns(); j++){
                PageFormat format = new PageFormat();
                Paper paper = new Paper();
                double columnOffset = (j-1)*cellWidth + x;
                paper.setImageableArea(columnOffset, rowOffset, cellWidth, cellHeight);
                format.setPaper(paper);
                pageFormats.add(format);
            }
        }

        //have each chartpanel print on the graphics context using its
        //particular PageFormat
        int size = Math.min(pageFormats.size(), panels.size());
        for(int i = 0; i < size; i++ ){
            panels.get(i).print(g, pageFormats.get(i), pageIndex);

        }

        return PAGE_EXISTS;
    }

ChartLayoutInstructions：

我计划扩展此类以用于定义更高级的行为。这就是我使用这个类而不仅仅是在CustomChartPanel类的构造函数中定义行和列的原因。

package com.company.jfreeChartCustom;

/**
 * ChartLayoutInstructions are used to specify how charts should be
 * layed out on screen and in print format.  
 *
 */
public class ChartLayoutInstructions {

    int rows;
    int columns;

    /**
     * Constructor
     * @param rows number of rows in the display/print grid
     * @param columns number of columns in the display/print grid
     */
    public ChartLayoutInstructions(int rows, int columns, boolean allowSwap){
        this.rows = Math.abs(rows);
        this.columns = Math.abs(columns);
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = Math.abs(rows);
    }

    public int getColumns() {
        return columns;
    }

    public void setColumns(int columns) {
        this.columns = Math.abs(columns);
    }
}