inittestresultschartaction.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys. 
 * Copyright (C) 2003 CyberDemia Research and Services Pty Ltd
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (see the file COPYING); if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * See the COPYING file located in the top-level-directory of
 * the archive of this program for complete text of license.
 */
package com.cyberdemia.cybertester.student.report;

import java.io.ByteArrayOutputStream;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import com.cyberdemia.school.*;
import com.cyberdemia.cybertester.*;
import com.cyberdemia.cybertester.student.StudentConstants;
import com.cyberdemia.cybertester.common.*;
import java.util.logging.*;
import java.util.*;
import org.jfree.chart.*;
import org.jfree.data.*;
import org.jfree.chart.renderer.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.PlotOrientation;
import java.awt.Color;
import java.awt.Font;

/**
 * InitTestResultsChartAction is a Struts action to plot a chart of the user's test results.
 * 
 * @author Alexander Yap
 */
public class InitTestResultsChartAction extends AbstractUserAction
{

	protected ActionForward doPerform(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response, HttpSession session) throws Exception
	{
		Logger logger = CyberTesterUtils.getLogger();
		String userId = (String)session.getAttribute(Constants.USER_ID_KEY);
		LinkedList stScoreList = new LinkedList();
		try
		{
			TestManagerHome tMgrHome = CyberTesterUtils.getTestManagerHome();
			TestManager testMgr = (TestManager)tMgrHome.create();
			TestData[] testList = testMgr.getTestsForUser(null, userId);
			for (int tidx=0; tidx<testList.length; tidx++)
			{
				ScoreData scoreData = testMgr.getTestScoreForUser(testList[tidx].getId(), userId, true);
				if ((scoreData!=null) && (scoreData.getMaxScore()>0))
				{
					stScoreList.add( scoreData );
				}
			}
			Collections.sort(stScoreList);
		}
		catch (Exception ex)
		{
			logger.log(Level.SEVERE, "Error getting scores for user "+userId, ex);
			throw ex;
		}

		DefaultCategoryDataset dataset = new DefaultCategoryDataset();
		Iterator stScoreIter = stScoreList.iterator();
		ArrayList colorList = new ArrayList();
		for (int i=1; stScoreIter.hasNext(); i++)
		{
			ScoreData sData = (ScoreData)stScoreIter.next();
			double sPercent = (sData.getScore()*100.0)/sData.getMaxScore();
			String dataLabel = (sData.getTestName().length()>10) ? sData.getTestName().substring(0,10)+"..." : sData.getTestName();
			dataset.addValue( sPercent, userId, dataLabel );
			if (sData.isPassed())
			{
				colorList.add(Color.GREEN);
			}
			else
			{
				colorList.add(Color.RED);
			}
		}

		JFreeChart chart = ChartFactory.createBarChart(
			"",
			"Tests", "Score %", dataset, PlotOrientation.VERTICAL, false, true, true);
		chart.setTitle(new TextTitle("Test results for "+session.getAttribute(Constants.USER_LOGIN_KEY), new Font("SansSerif",Font.BOLD, 12)));
		((CategoryAxis)chart.getCategoryPlot().getDomainAxis()).setVerticalCategoryLabels(true);
		ValueAxis rangeAxis = chart.getCategoryPlot().getRangeAxis();
		rangeAxis.setMaximumAxisValue(100.0);
		rangeAxis.setMinimumAxisValue(0.0);
		BarRenderer renderer = new ResultsBarRenderer( (Color[])colorList.toArray(new Color[0]));
		chart.getCategoryPlot().setRenderer(renderer);

		renderer.setItemLabelGenerator( new TestResultsToolTipGenerator(stScoreList) );
		renderer.setItemURLGenerator( new TestResultsURLGenerator(stScoreList) );

		chart.setAntiAlias(true);
		int width = Math.max(400, 100+(dataset.getColumnCount()*30));
		int height = 600;
		try
		{
			width = Integer.parseInt( request.getParameter("width") );
		}
		catch (NumberFormatException nfex)
		{ }
		try
		{
			height = Integer.parseInt( request.getParameter("height") );
		}
		catch (NumberFormatException nfex)
		{ }

		final ByteArrayOutputStream baos = new ByteArrayOutputStream();
		final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
		ChartUtilities.writeChartAsPNG( baos , chart,width, height, info );
		ChartDataCache cache = new ChartDataCache();
		cache.data = baos.toByteArray();
		cache.info = info;
		Map chartsCache = (Map)session.getAttribute(Constants.CHARTS_CACHE_KEY);
		String chartId = String.valueOf(System.currentTimeMillis());
		chartsCache.put(chartId, cache);

		request.setAttribute(StudentConstants.RESULTS_CHART_ID_KEY, chartId);
		return mapping.findForward(Constants.SUCCESS);
	}
	
	class ResultsBarRenderer extends BarRenderer
	{
		public ResultsBarRenderer(Color[] barColors)
		{
			super();
			m_barColors = barColors;
//			setPaintTableActive(true);
		}
		
		public java.awt.Paint getItemPaint(int row, int column)
		{
			if (column<m_barColors.length)
			{
				return m_barColors[column];
			}
			return super.getItemPaint(row,column);
		}
		
		private Color[] m_barColors;
	}

}