/* ------------------
* BarChartDemo4.java
* ------------------
* (C) Copyright 2003-2005, by Object Refinery Limited.
*
*/import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;import javax.imageio.ImageIO;
import javax.swing.JPanel;import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
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.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;/**
* A bar chart with only two bars - here the 'maxBarWidth' attribute in the
* renderer prevents the bars from getting too wide.
*/
public class BarChartDemo4 { /**
*
*/
private static final long serialVersionUID = -4635170179349250414L; /**
* Creates a new demo instance.
*
* @param title
* the frame title.
*/ /**
* Returns a sample dataset.
*
* @return The dataset.
*/
private static CategoryDataset createDataset() { // row keys...
String series1 = "First";
String series2 = "Second"; // column keys...
String category1 = "Category 1"; // create the dataset...
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(1.0, series1, category1);
dataset.addValue(5.0, series2, category1); return dataset; } /**
* Creates a sample chart.
*
* @param dataset
* the dataset.
*
* @return The chart.
*/
private static JFreeChart createChart(CategoryDataset dataset) { // create the chart...
JFreeChart chart = ChartFactory.createBarChart("Bar Chart Demo", // chart
// title
"Category", // domain axis label
"Value", // range axis label
dataset, // data
PlotOrientation.VERTICAL, true, // include legend
true, // tooltips?
false // URLs?
); // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART... // set the background color for the chart...
chart.setBackgroundPaint(new Color(0xBBBBDD)); // get a reference to the plot for further customisation...
CategoryPlot plot = (CategoryPlot) chart.getPlot(); // set the range axis to display integers only...
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); // disable bar outlines...
BarRenderer renderer = (BarRenderer) plot.getRenderer();
renderer.setDrawBarOutline(false);
renderer.setMaximumBarWidth(0.10); // set up gradient paints for series...
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);
renderer.setSeriesPaint(0, gp0);
renderer.setSeriesPaint(1, gp1); // OPTIONAL CUSTOMISATION COMPLETED. return chart; } /**
* Starting point for the demonstration application.
*
* @param args
* ignored.
* @throws IOException
*/
public static void main(String[] args) throws IOException {
JFreeChart jfreechart = createChart(createDataset());
ChartUtilities.saveChartAsJPEG(new File("c:/jfreechart.jpg"), 0.8f,
jfreechart, 800, 600);
BufferedImage bi = jfreechart.createBufferedImage(
800, 600);
ImageIO.write(bi, "JPEG", new File("c:/bi.jpg"));
}
}
* BarChartDemo4.java
* ------------------
* (C) Copyright 2003-2005, by Object Refinery Limited.
*
*/import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;import javax.imageio.ImageIO;
import javax.swing.JPanel;import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
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.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;/**
* A bar chart with only two bars - here the 'maxBarWidth' attribute in the
* renderer prevents the bars from getting too wide.
*/
public class BarChartDemo4 { /**
*
*/
private static final long serialVersionUID = -4635170179349250414L; /**
* Creates a new demo instance.
*
* @param title
* the frame title.
*/ /**
* Returns a sample dataset.
*
* @return The dataset.
*/
private static CategoryDataset createDataset() { // row keys...
String series1 = "First";
String series2 = "Second"; // column keys...
String category1 = "Category 1"; // create the dataset...
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(1.0, series1, category1);
dataset.addValue(5.0, series2, category1); return dataset; } /**
* Creates a sample chart.
*
* @param dataset
* the dataset.
*
* @return The chart.
*/
private static JFreeChart createChart(CategoryDataset dataset) { // create the chart...
JFreeChart chart = ChartFactory.createBarChart("Bar Chart Demo", // chart
// title
"Category", // domain axis label
"Value", // range axis label
dataset, // data
PlotOrientation.VERTICAL, true, // include legend
true, // tooltips?
false // URLs?
); // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART... // set the background color for the chart...
chart.setBackgroundPaint(new Color(0xBBBBDD)); // get a reference to the plot for further customisation...
CategoryPlot plot = (CategoryPlot) chart.getPlot(); // set the range axis to display integers only...
NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); // disable bar outlines...
BarRenderer renderer = (BarRenderer) plot.getRenderer();
renderer.setDrawBarOutline(false);
renderer.setMaximumBarWidth(0.10); // set up gradient paints for series...
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);
renderer.setSeriesPaint(0, gp0);
renderer.setSeriesPaint(1, gp1); // OPTIONAL CUSTOMISATION COMPLETED. return chart; } /**
* Starting point for the demonstration application.
*
* @param args
* ignored.
* @throws IOException
*/
public static void main(String[] args) throws IOException {
JFreeChart jfreechart = createChart(createDataset());
ChartUtilities.saveChartAsJPEG(new File("c:/jfreechart.jpg"), 0.8f,
jfreechart, 800, 600);
BufferedImage bi = jfreechart.createBufferedImage(
800, 600);
ImageIO.write(bi, "JPEG", new File("c:/bi.jpg"));
}
}
这个类不知道是哪个包的
import java.io.*;
import org.jfree.data.*;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.category.*;
import java.awt.Color;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import java.awt.Font;
import org.jfree.chart.axis.AxisLocation;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.Toolkit;
import java.awt.Dimension;
/**
* <p>Title: Java开发手册</p>
*
* <p>Description: 适合中高级使用者</p>
*
* <p>Copyright: Copyright (c) 2007</p>
*
* <p>Company: lingbrother</p>
*
* @author lingbrother
* @version 1.0
*/
public class BarChartDemo {
public BarChartDemo() {
super();
} public static void main(String[] args) throws IOException{
CategoryDataset dataset = getDataSet();
JFreeChart chart = ChartFactory.createBarChart3D(
"招生信息总览", // 图表标题
"应报与实报对照", // 目录轴的显示标签
"人数", // 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)
true, // 是否生成工具
true // 是否生成URL链接
);
CategoryPlot plot = chart.getCategoryPlot();//获得图表区域对象
//设置图表的纵轴和横轴org.jfree.chart.axis.CategoryAxis
org.jfree.chart.axis.CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setLowerMargin(0.1);//设置距离图片左端距离此时为10%
domainAxis.setUpperMargin(0.1);//设置距离图片右端距离此时为百分之10
domainAxis.setCategoryLabelPositionOffset(10);//图表横轴与标签的距离(10像素)
domainAxis.setCategoryMargin(0.2);//横轴标签之间的距离20%
//domainAxis.setMaximumCategoryLabelLines(1);
//domainAxis.setMaximumCategoryLabelWidthRatio(0); //设定柱子的属性
org.jfree.chart.axis.ValueAxis rangeAxis = plot.getRangeAxis();
rangeAxis.setUpperMargin(0.1);//设置最高的一个柱与图片顶端的距离(最高柱的10%) //设置图表的颜色
org.jfree.chart.renderer.category.BarRenderer3D renderer;
renderer = new org.jfree.chart.renderer.category.BarRenderer3D();
renderer.setBaseOutlinePaint(Color.red);
renderer.setSeriesPaint(0, new Color(0, 255, 255));//计划柱子的颜色为青色
renderer.setSeriesOutlinePaint(0,Color.BLACK);//边框为黑色
renderer.setSeriesPaint(1, new Color(0, 255, 0));//实报柱子的颜色为绿色
renderer.setSeriesOutlinePaint(1,Color.red);//边框为红色
renderer.setItemMargin(0.1);//组内柱子间隔为组宽的10%
//显示每个柱的数值,并修改该数值的字体属性
renderer.setItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setItemLabelFont(new Font("黑体",Font.BOLD,12));//12号黑体加粗
renderer.setItemLabelPaint(Color.black);//字体为黑色
renderer.setItemLabelsVisible(true);
plot.setRenderer(renderer);//使用我们设计的效果 //设置纵横坐标的显示位置
plot.setDomainAxisLocation(AxisLocation.BOTTOM_OR_LEFT);//学校显示在下端(柱子竖直)或左侧(柱子水平)
plot.setRangeAxisLocation(AxisLocation.BOTTOM_OR_LEFT); //人数显示在下端(柱子水平)或左侧(柱子竖直) try {
File file = new File("c:/student.png");
ChartUtilities.saveChartAsPNG(file,chart,400,300);//把报表保存为文件
}catch (Exception e) {
String s = e.getLocalizedMessage();
s = e.getMessage();
s = e.toString();
}
//将生成的报表放到预览窗口中
final ChartFrame preview = new ChartFrame("招生信息",chart);
preview.addWindowListener(new WindowAdapter() {
public void windowClosing(final WindowEvent event) {
preview.dispose();
}
});
preview.pack();
//调整预览窗口的大小和位置,适合屏幕,并且居中
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
preview.setSize(screenSize.width,screenSize.height-50);//适合屏幕,50表示把工具栏要考虑在内
Dimension frameSize = preview.getSize();
if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
}
if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
}
preview.setLocation( (screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height-50) / 2); //显示报表预览窗口
preview.setVisible(true);
}
/**
* 获取一个演示用的组合数据集对象
* @return
*/
private static CategoryDataset getDataSet() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(200, "计划", "清华大学");
dataset.addValue(400, "实报", "清华大学");
dataset.addValue(100, "计划", "天津大学");
dataset.addValue(205, "实报", "天津大学");
dataset.addValue(200, "计划", "郑州大学");
dataset.addValue(285, "实报", "郑州大学");
return dataset;
}
}
和image的图片效果不一样啊!这是为什么呢?
和image的图片效果不一样啊!这是为什么呢?