关于jfreechart柱状图横向显示的问题（不好意思就这么多分了）

shenxueshi 2007-11-01 05:38:02

各位：

我有如下代码，生成横向的柱状图：



    <%@ page contentType="text/html; charset=GBK" %>

<%@ page import="org.jfree.chart.*" %>

<%@ page import="org.jfree.data.*" %>

<%@ page import="org.jfree.data.category.*" %>

<%@ page import="org.jfree.chart.entity.StandardEntityCollection"%>

<%@ page import="org.jfree.chart.servlet.ServletUtilities"%>

<%@ page import="org.jfree.chart.plot.*" %>

<%@ page import="org.jfree.chart.axis.*" %>

<%@ page import="org.jfree.chart.renderer.category.*" %>

<%@ page import="org.jfree.chart.labels.*" %>

<%@ page import="java.awt.*" %>

<%@ page import="java.io.*"%>

<html>

	<head>

		<meta http-equiv=Content-Type content="text/html;charset=gbk">

		<title>WebReportTest</title>

	</head>

	<body>

		<%!

			DefaultCategoryDataset getDataset(){

				DefaultCategoryDataset dataset = new DefaultCategoryDataset();

				dataset.addValue(100,"北京","苹果");

				dataset.addValue(200,"上海","苹果");

				dataset.addValue(150,"广州","苹果");

				dataset.addValue(200,"北京","梨子");

				dataset.addValue(180,"上海","梨子");

				dataset.addValue(190,"广州","梨子");

				dataset.addValue(300,"北京","葡萄");

				dataset.addValue(320,"上海","葡萄");

				dataset.addValue(200,"广州","葡萄");

				dataset.addValue(300,"北京","香蕉");

				dataset.addValue(350,"上海","香蕉");

				dataset.addValue(400,"广州","香蕉");

				dataset.addValue(400,"北京","荔枝");

				dataset.addValue(360,"上海","荔枝");

				dataset.addValue(400,"广州","荔枝");

				return dataset;

			}

			

			DefaultCategoryDataset getDataset2(){

				DefaultCategoryDataset dataset = new DefaultCategoryDataset();

				dataset.addValue(100,"北京","苹果苹果苹果");

				dataset.addValue(200,"上海","苹果苹果苹果");

				dataset.addValue(150,"广州","苹果苹果苹果");

				dataset.addValue(200,"北京","梨子梨子梨子");

				dataset.addValue(180,"上海","梨子梨子梨子");

				dataset.addValue(190,"广州","梨子梨子梨子");

				dataset.addValue(300,"北京","葡萄葡萄葡萄");

				dataset.addValue(320,"上海","葡萄葡萄葡萄");

				dataset.addValue(200,"广州","葡萄葡萄葡萄");

				dataset.addValue(300,"北京","香蕉香蕉香蕉");

				dataset.addValue(350,"上海","香蕉香蕉香蕉");

				dataset.addValue(400,"广州","香蕉香蕉香蕉");

				dataset.addValue(400,"北京","荔枝荔枝荔枝");

				dataset.addValue(360,"上海","荔枝荔枝荔枝");

				dataset.addValue(400,"广州","荔枝荔枝荔枝");

				return dataset;

			}

		%>

	<%

		DefaultCategoryDataset dataset = getDataset();

		//DefaultCategoryDataset dataset = getDataset2();

		

		JFreeChart jfreechart = ChartFactory.createBarChart("水果产量图","水果","产量",dataset,PlotOrientation.HORIZONTAL,true,false,false);

		jfreechart.setBackgroundPaint(Color.white); //设定背景色为白色 

		jfreechart.getRenderingHints().put(RenderingHints.KEY_TEXT_ANTIALIASING,RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);

		CategoryPlot categoryplot = jfreechart.getCategoryPlot(); //获得 plot：CategoryPlot 

		categoryplot.setBackgroundPaint(Color.lightGray); //设定图表数据显示部分背景色 		categoryplot.setRangeGridlinePaint(Color.black); //纵坐标网格线白色 		BarRenderer barrenderer = (BarRenderer)categoryplot.getRenderer(); //获得renderer 		barrenderer.setDrawBarOutline(false); // Bar的外轮廓线不画 

		

		//barrenderer.setItemURLGenerator(new org.jfree.chart.urls.StandardCategoryURLGenerator("aa.jsp"));

		barrenderer.setToolTipGenerator(new StandardCategoryToolTipGenerator());

		

		StandardEntityCollection sec = new StandardEntityCollection();

		ChartRenderingInfo info = new ChartRenderingInfo(sec);

	

		GradientPaint gradientpaint = new GradientPaint(0.0F,0.0F,Color.blue,0.0F,0.0F,new Color(0,0,64)); //设定特定颜色 

		GradientPaint gradientpaint1 = new GradientPaint(0.0F,0.0F,Color.yellow,0.0F,0.0F,new Color(0,64,0));

		GradientPaint gradientpaint2 = new GradientPaint(0.0F,0.0F,Color.red,0.0F,0.0F,new Color(64,0,0)); 

		barrenderer.setSeriesPaint(0, gradientpaint); //给series1 Bar设定上面定义的颜色 

		barrenderer.setSeriesPaint(1, gradientpaint1); //给series2 Bar 设定上面定义的颜色 

		barrenderer.setSeriesPaint(2, gradientpaint2); //给series3 Bar 设定上面定义的颜色 

		//CategoryAxis categoryaxis = categoryplot.getDomainAxis(); //横轴上的 Lable 45度倾斜 

		//categoryaxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);

		

		PrintWriter w = new PrintWriter(out);

	

		String filename = ServletUtilities.saveChartAsPNG(jfreechart,300,500,info,session);

		ChartUtilities.writeImageMap(w,filename,info,false);

		

		String graphURL = request.getContextPath() + "/servlet/DisplayChart?filename=" + filename;

	%>

	<table border="1">

		<tr>

			<td>

				<img src="<%=graphURL%>" width="300" height="500" border="0" usemap="#<%=filename%>">

			</td>

		</tr>

	</table>

	</body>

</html>