barchartdemo.java

来自「jfreechart不错的教程例子谢谢!」· Java 代码 · 共 116 行

package org.jfree.chart.demo;

import java.awt.Color;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.BarRenderer3D;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;
/**
 * 该类用于演示最简单的柱状图生成
 * @author Winter Lau
 */
public class BarChartDemo {
	public static void main(String[] args) throws IOException{
		CategoryDataset dataset = getDataSet2();
		JFreeChart chart = ChartFactory.createBarChart3D(
							"水果产量图", // 图表标题
							"水果", // 目录轴的显示标签
							"产量", // 数值轴的显示标签
							dataset, // 数据集
							PlotOrientation.VERTICAL, // 图表方向：水平、垂直
							true, 	// 是否显示图例(对于简单的柱状图必须是false)
							false, 	// 是否生成工具
							false 	// 是否生成URL链接
							);
		chart.setBackgroundPaint(Color.WHITE);
		CategoryPlot plot = chart.getCategoryPlot();
		CategoryAxis domainAxis = plot.getDomainAxis();
		//domainAxis.setVerticalCategoryLabels(false);
		plot.setDomainAxis(domainAxis);
		ValueAxis rangeAxis = plot.getRangeAxis();
		//设置最高的一个 Item 与图片顶端的距离
		rangeAxis.setUpperMargin(0.15);
		//设置最低的一个 Item 与图片底端的距离
		rangeAxis.setLowerMargin(0.15);
		plot.setRangeAxis(rangeAxis);
		BarRenderer3D renderer = new BarRenderer3D();
		renderer.setBaseOutlinePaint(Color.BLACK);
		//设置 Wall 的颜色<BR>
		renderer.setWallPaint(Color.gray);
		//设置每种水果代表的柱的颜色
		renderer.setSeriesPaint(0, new Color(0, 0, 255));
		renderer.setSeriesPaint(1, new Color(0, 100, 255));
		renderer.setSeriesPaint(2, Color.GREEN);
		//设置每个地区所包含的平行柱的之间距离
		renderer.setItemMargin(0.1);
		//显示每个柱的数值，并修改该数值的字体属性<BR>
		renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
		renderer.setItemLabelsVisible(true);
		plot.setRenderer(renderer);
		//设置柱的透明度<BR>
		plot.setForegroundAlpha(0.6f);
		//设置地区、销量的显示位置<BR>
		plot.setDomainAxisLocation(AxisLocation.TOP_OR_RIGHT);
		plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);
		
		OutputStream out = null;
		try {
			out = new BufferedOutputStream(new FileOutputStream("F:\\fruit.jpg"));
			ChartUtilities.writeChartAsJPEG(out,1.0f,chart,400,300,null);
			System.out.println("图表生成完毕!");
		} finally {
			try {
				out.close();
			} catch (Exception e) {}
		}
	}
	/**
	 * 获取一个演示用的简单数据集对象
	 * @return
	 */
	private static CategoryDataset getDataSet() {
		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		dataset.addValue(100, "", "苹果");
		dataset.addValue(200, "", "梨子");
		dataset.addValue(300, "", "葡萄");
		dataset.addValue(400, "", "香蕉");
		dataset.addValue(500, "", "荔枝");
		return dataset;
	}
	/**
	 * 获取一个演示用的组合数据集对象
	 * @return
	 */
	private static CategoryDataset getDataSet2() {
		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		dataset.addValue(100, "北京", "苹果");
		dataset.addValue(100, "上海", "苹果");
		dataset.addValue(100, "广州", "苹果");
		dataset.addValue(200, "北京", "梨子");
		dataset.addValue(200, "上海", "梨子");
		dataset.addValue(200, "广州", "梨子");
		dataset.addValue(300, "北京", "葡萄");
		dataset.addValue(300, "上海", "葡萄");
		dataset.addValue(300, "广州", "葡萄");
		dataset.addValue(400, "北京", "香蕉");
		dataset.addValue(400, "上海", "香蕉");
		dataset.addValue(400, "广州", "香蕉");
		dataset.addValue(500, "北京", "荔枝");
		dataset.addValue(500, "上海", "荔枝");
		dataset.addValue(500, "广州", "荔枝");
		return dataset;
	}
}