src/com/mwq/stat/chart/Bar.java

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/*
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package com.mwq.stat.chart;

import com.mwq.stat.dataform.DataFormInterface;
import com.mwq.stat.tool.Today;
import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.util.Vector;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.chart.title.TextTitle;
import org.jfree.data.category.DefaultCategoryDataset;

public class Bar extends ChartPanel implements DataFormInterface {
    public Bar() {
        super(createChart());// 利用JFreeChart对象创建ChartPanel对象
    }
    public static JFreeChart createChart() {// 创建JFreeChart对象
        // 创建绘图数据集
        DefaultCategoryDataset dataset = new DefaultCategoryDataset();
        for (int row = 0; row < tableData.size(); row++) {
            Vector rowData = tableData.get(row);
            String cutline = rowData.get(0).toString();
            for (int column = 1; column < columnName.size(); column++) {
                dataset.setValue(new Double((Integer) rowData.get(column)),
                        cutline, columnName.get(column));
            }
        }
        // 创建3D效果图
        JFreeChart chart = ChartFactory.createBarChart3D("数据概览", "日期",
                "金额（单位：元）", dataset, PlotOrientation.VERTICAL, true, true,
                false);
        chart.addSubtitle(new TextTitle("—— 统计日期：" + Today.getDate()));// 设置副标题
        chart.setBackgroundPaint(new GradientPaint(0, 0, Color.YELLOW, 0, 300,
                Color.GREEN, false));// 设置背景色
        CategoryPlot plot = (CategoryPlot) chart.getPlot();// 获得绘图区对象
        CategoryAxis domainAxis = plot.getDomainAxis();// 获得分类（X）轴对象
        domainAxis.setLowerMargin(0.03);// 设置最左侧柱形与绘图区左边框的距离
        domainAxis.setUpperMargin(0.02);// 设置最右侧柱形与绘图区右边框的距离
        BarRenderer3D renderer = (BarRenderer3D) plot.getRenderer();// 获得柱形对象
        renderer.setMinimumBarLength(30);// 设置柱形的最小高度
        updateFont(chart);
        return chart;
    }
    /**
     * 修改字体
     * 
     * @param chart
     */
    private static void updateFont(JFreeChart chart) {