inittestresultschartaction.java

老外的在线考试

/*
 * CyberTester - J2EE Web application for creating, delivering and managing tests/exams/surveys.
 * Copyright (C) 2004 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.testee.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.testee.TesteeConstants;
import com.cyberdemia.cybertester.common.*;
import java.util.logging.*;
import java.util.*;
import org.jfree.chart.title.*;
import org.jfree.chart.*;
import org.jfree.data.*;
import org.jfree.chart.renderer.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.imagemap.*;
import org.jfree.chart.entity.ChartEntity;
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.
 *
 * @version $Revision: 1.5 $ at $Date: 2004/06/22 17:06:17 $ by $Author: alexycyap $
 * @author Alexander Yap, Nita Ambedkar
 */
public class InitTestResultsChartAction extends AbstractUserAction
{

    protected ActionForward doPerform(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response, HttpSession session) throws Exception
    {
        Logger logger = CyberTesterUtils.getLogger();
        Integer userId = (Integer)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)));
        /*  Change for new version of JFree Chart 9.18 Change begin */
        ((CategoryAxis)chart.getCategoryPlot().getDomainAxis()).setCategoryLabelPositions(new CategoryLabelPositions());
        /*  Change for new version of JFree Chart 9.18 Change End */
        ValueAxis rangeAxis = chart.getCategoryPlot().getRangeAxis();
        /*  Change for new version of JFree Chart 9.18 Change begin */
        rangeAxis.setUpperBound(100.0);
        rangeAxis.setLowerBound(0.0);
        /*  Change for new version of JFree Chart 9.18 Change End */
        BarRenderer renderer = new ResultsBarRenderer( (Color[])colorList.toArray(new Color[0]));
        chart.getCategoryPlot().setRenderer(renderer);

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

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

        int height = 600;
        try
        {
            height = Integer.parseInt( request.getParameter("height") );
        }
        catch (NumberFormatException nfex)
        {
            // Ignore, height unchanged.
        }

        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(TesteeConstants.RESULTS_CHART_INFO_KEY, CyberTesterUtils.getImageMapAreaList(cache.info) );
        request.setAttribute(TesteeConstants.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;
    }

}