dialchart2.jsp

JFreeChart开发全攻略,JFreeChart开发全攻略

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ page import="org.jfree.chart.JFreeChart,
                 org.jfree.chart.servlet.ServletUtilities,
                 org.jfree.data.general.DefaultValueDataset,
                 org.jfree.experimental.chart.plot.dial.*,
                 java.awt.*,
                 org.jfree.ui.StandardGradientPaintTransformer,
                 org.jfree.ui.GradientPaintTransformType"%>
                 
<%
//构造数据集
DefaultValueDataset dataset = new DefaultValueDataset(50D);

//设置刻度图形属性
DialPlot dialplot = new DialPlot();
dialplot.setView(0.2D, 0.0D, 0.58D, 0.3D);
dialplot.setDataset(dataset);

//设置刻度面板
StandardDialFrame standarddialframe = new StandardDialFrame(60D, 60D);
//设置刻度面板的内径
standarddialframe.setInnerRadius(0.7D);
//设置刻度面板的外径
standarddialframe.setOuterRadius(0.95D);
//设置面板的前景颜色
standarddialframe.setForegroundPaint(Color.gray);
//设置面板的粗细
standarddialframe.setStroke(new BasicStroke(2F));
dialplot.setDialFrame(standarddialframe);
GradientPaint gradientpaint = new GradientPaint(new Point(),
				new Color(255, 255, 255),
				new Point(),
				new Color(230, 230, 230));
				
//设置刻度的背景
DialBackground dialbackground = new DialBackground(gradientpaint);
dialbackground.setGradientPaintTransformer(new StandardGradientPaintTransformer(GradientPaintTransformType.VERTICAL));
dialplot.addLayer(dialbackground);
StandardDialScale standarddialscale = new StandardDialScale(0.0D, 75D, 115D, -50D);
standarddialscale.setTickRadius(0.88D);
standarddialscale.setTickLabelOffset(0.07D);
standarddialscale.setMajorTickIncrement(25D);
standarddialscale.setTickLabelPaint(null);
dialplot.addScale(0, standarddialscale);
org.jfree.experimental.chart.plot.dial.DialPointer.Pin pin = new org.jfree.experimental.chart.plot.dial.DialPointer.Pin();
pin.setRadius(0.82D);
dialplot.addLayer(pin);

//根据可读图形构造JFreeChart对象
JFreeChart jfreechart = new JFreeChart(dialplot);
//设置图形标题
jfreechart.setTitle("刻度图示例");
		
String filename = ServletUtilities.saveChartAsPNG(jfreechart, 400, 300, null, session);
String graphURL = request.getContextPath() + "/DisplayChart?filename=" + filename;
%>
<img src="<%= graphURL %>" width="400" height="300" border="0" usemap="#<%= filename %>">