jfreechartDemo--使用jfreechart制作柱状图

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下面的Demo根据jfreechart的用户开发指南以及csdn上的一片文章改编而成。
blog的的地址是：http://blog.csdn.net/simon_21/archive/2007/08/21/1752656.aspx
显示效果如下：

//package newTechnology;

/**

* @author: Tonychow Create On :2007-8-26

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.GradientPaint;

import javax.swing.JPanel;

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.CategoryLabelPosition;

import org.jfree.chart.axis.CategoryLabelPositions;

import org.jfree.chart.axis.CategoryLabelWidthType;

import org.jfree.chart.labels.ItemLabelAnchor;

import org.jfree.chart.labels.ItemLabelPosition;

import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.renderer.category.BarRenderer;

import org.jfree.data.category.CategoryDataset;

import org.jfree.data.category.DefaultCategoryDataset;

import org.jfree.text.TextBlockAnchor;

import org.jfree.ui.ApplicationFrame;

import org.jfree.ui.RectangleAnchor;

import org.jfree.ui.RefineryUtilities;

import org.jfree.ui.TextAnchor;

import org.jfree.util.Log;

import org.jfree.util.PrintStreamLogTarget;

// import com.cabletech.demo.BarChart3DDemo4.CustomBarRenderer3D;

public class Demo extends ApplicationFrame {

/**

private static final long serialVersionUID = -7661683768592125573L;

public Demo(String string) {

super(string);

JPanel jpanel = createDemoPanel();

jpanel.setPreferredSize(new Dimension(500, 270));

setContentPane(jpanel);

}

//生成数据集

private static CategoryDataset createDataset() {

// row keys

String series1 = "First";

String series2 = "Second";

String series3 = "Third";

// category keys

String category1 = "London";

String category2 = "New York";

String category3 = "Istanbul";

String category4 = "Cairo";

DefaultCategoryDataset defaultcategorydataset = new DefaultCategoryDataset();

defaultcategorydataset.addValue(23.0, series1, category1);

defaultcategorydataset.addValue(14.0, series1, category2);

defaultcategorydataset.addValue(14.0, series1, category3);

defaultcategorydataset.addValue(14.0, series1, category4);

defaultcategorydataset.addValue(13.0, series2, category1);

defaultcategorydataset.addValue(19.0, series2, category2);

defaultcategorydataset.addValue(19.0, series2, category3);

defaultcategorydataset.addValue(19.0, series2, category4);

defaultcategorydataset.addValue(7.0, series3, category1);

defaultcategorydataset.addValue(2, series3, category2);

defaultcategorydataset.addValue(9.0, series3, category3);

defaultcategorydataset.addValue(9.0, series3, category4);

return defaultcategorydataset;

}

private static JFreeChart createChart(CategoryDataset categorydataset) {

JFreeChart jfreechart = ChartFactory.createBarChart3D(

"3D Bar Chart Demo ",//标题

"Category", //横轴标签

"Value",//纵轴标签

categorydataset,//数据集

PlotOrientation.VERTICAL, //柱体方向（垂直）

true, //是否显示提示标签（tooltips）

true, //lendge?

false//是否在主题上使用超链接);

//设置背景色

jfreechart.setBackgroundPaint(Color.cyan);

// 需要更改其它的设置要获得categoryplot...如下...

CategoryPlot categoryplot = (CategoryPlot) jfreechart.getPlot();

categoryplot.setForegroundAlpha(1.0F);

// 显示每个柱的数值，并修改该数值的字体属性

categoryplot.getRenderer().setItemLabelGenerator(

new StandardCategoryItemLabelGenerator());

categoryplot.getRenderer().setItemLabelsVisible(true);

categoryplot.getRenderer().setPositiveItemLabelPosition(

new ItemLabelPosition(ItemLabelAnchor.OUTSIDE12,

TextAnchor.BOTTOM_LEFT));

// disable bar outlines...

BarRenderer renderer = (BarRenderer) categoryplot.getRenderer();

renderer.setDrawBarOutline(false);

//设置柱体标签

renderer.setItemLabelAnchorOffset(.5f);

renderer.setItemLabelFont(new Font("myfont",Font.ITALIC,10));

renderer.setItemLabelsVisible(true);

renderer.setItemMargin(.3);

// set up gradient paints for series...

//设置在每一个category中的series的颜色....第一个coloe参数是柱体要显示的颜色,

//第二个color参数是series之间间隔的颜色

GradientPaint gp0 = new GradientPaint(0.0f, 0.0f, Color.blue, 0.0f,

0.0f, Color.lightGray);

GradientPaint gp1 = new GradientPaint(0.0f, 0.0f, Color.green, 0.0f,

0.0f, Color.lightGray);

GradientPaint gp2 = new GradientPaint(0.0f, 0.0f, Color.red, 0.0f,

0.0f, Color.lightGray);

renderer.setSeriesPaint(0, gp0);

renderer.setSeriesPaint(1, gp1);

renderer.setSeriesPaint(2, gp2);

// 设置坐标轴位置

// categoryplot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_RIGHT);

CategoryAxis categoryaxis = categoryplot.getDomainAxis();

categoryaxis.setCategoryMargin(0.1);

/ /设置横轴显示的样式

CategoryLabelPositions categorylabelpositions = categoryaxis

.getCategoryLabelPositions();

CategoryLabelPosition categorylabelposition = new CategoryLabelPosition(

RectangleAnchor.LEFT, TextBlockAnchor.CENTER_LEFT,

TextAnchor.CENTER_LEFT, 0.0, CategoryLabelWidthType.RANGE, 0.3F);

categoryaxis.setCategoryLabelPositions(CategoryLabelPositions

.replaceLeftPosition(categorylabelpositions,

categorylabelposition));

return jfreechart;

}

public static JPanel createDemoPanel() {

JFreeChart jfreechart = createChart(createDataset());

return new ChartPanel(jfreechart);

}

public static void main(String[] strings) {

Log.getInstance().addTarget(new PrintStreamLogTarget());

Demo barchart3ddemo2 = new Demo("3D Bar Chart Demo 2");

barchart3ddemo2.pack();

RefineryUtilities.centerFrameOnScreen(barchart3ddemo2);

barchart3ddemo2.setVisible(true);

}