moodle/report/courseoverview/reportsgraph.php

<?php

    require_once('../../config.php');
    require_once($CFG->dirroot.'/lib/statslib.php');
    require_once($CFG->dirroot.'/lib/graphlib.php');

    $report     = required_param('report', PARAM_INT);
    $time       = required_param('time', PARAM_INT);
    $numcourses = required_param('numcourses', PARAM_INT);

    require_login();

    require_capability('report/courseoverview:view', get_context_instance(CONTEXT_SYSTEM));

    stats_check_uptodate();

    $param = stats_get_parameters($time,$report,SITEID,STATS_MODE_RANKED);

    if (!empty($param->sql)) {
        $sql = $param->sql;
    } else {
        $sql = "SELECT courseid, $param->fields
                  FROM {".'stats_'.$param->table."}
                 WHERE timeend >= $param->timeafter AND stattype = 'activity' AND roleid = 0
              GROUP BY courseid
                       $param->extras
              ORDER BY $param->orderby";
    }

    $courses = $DB->get_records_sql($sql, $param->params, 0, $numcourses);

    if (empty($courses)) {
        $PAGE->set_url('/report/courseoverview/index.php');
        print_error('statsnodata', 'error', $PAGE->url->out());
    }


    $graph = new graph(750,400);

    $graph->parameter['legend'] = 'outside-right';
    $graph->parameter['legend_size'] = 10;
    $graph->parameter['x_axis_angle'] = 90;
    $graph->parameter['title'] = false; // moodle will do a nicer job.
    $graph->y_tick_labels = null;
    $graph->offset_relation = null;
    if ($report != STATS_REPORT_ACTIVE_COURSES) {
        $graph->parameter['y_decimal_left'] = 2;
    }

    foreach ($courses as $c) {
        $graph->x_data[] = $DB->get_field('course', 'shortname', array('id'=>$c->courseid));
        $graph->y_data['bar1'][] = $c->{$param->graphline};
    }
    $graph->y_order = array('bar1');
    $graph->y_format['bar1'] = array('colour' => 'blue','bar' => 'fill','legend' => $param->{$param->graphline});

    $graph->draw_stack();