class.SurveyChart.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | 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; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class SurveyChart
{
        var $graph;
        var $graphData;
        
        function SurveyChart($GraphTyp,$XSize,$YSize,$Titel,$XLabel,$YLabel,$DataArray)
        {
                $this->graphData = array();
                include_once ("./Modules/SurveyQuestionPool/phplot/phplot.php");
                $this->graph = new PHPlot($XSize,$YSize);
                switch ($GraphTyp)
                {
                        case "pie":
                                $this->graph->SetDataType("text-data-single");
                                break;
                        default:
                                $this->graph->SetDataType("text-data");
                                break;
                }
                $this->graph->SetPlotType($GraphTyp);
                if (strlen($Titel) > 40)
                {
                        $this->graph->SetFont("title", "benjamingothic.ttf", 6);
                }
                if (strlen($Titel) > 80)
                {
                        $Titel = substr($Titel, 0, 80) . "...";
                }
                $this->graph->SetTitle($Titel);
                $this->graph->SetXTitle($XLabel);
                $this->graph->SetYTitle($YLabel);
                $this->graph->SetXDataLabelPos("plotdown");
                $this->makeDataForOneQuestion($DataArray, $GraphTyp);
                $max = 0;
                foreach ($this->graphData as $value)
                {
                        if ($value[1] > $max) $max = $value[1];
                }
                $this->graph->SetYTickIncrement(ceil($max / 4));
                $this->graph->SetDataValues($this->graphData);
                $this->graph->SetPlotAreaWorld(NULL, 0, NULL, NULL);
                $this->draw();
        }

        function makeDataForOneQuestion($Data, $GraphTyp)
        {
                foreach ($Data as $value)
                {
                        if (array_key_exists("title", $value))
                        {
                                switch ($GraphTyp)
                                {
                                        case "pie":
                                                array_push($this->graphData, array($value["title"], $value["selected"], ""));
                                                break;
                                        default:
                                                array_push($this->graphData, array($value["title"], $value["selected"]));
                                                break;
                                }
                        }
                        else
                        {
                                array_push($this->graphData, array($value["value"], $value["selected"]));
                        }
                }
        }

        function draw()
        {
                $this->graph->DrawGraph();
                $this->graph->PrintImage();
        }
}

?>