Add graph for users/groups/views weekly data

Signed-off-by: Richard Mansfield <richardm@catalyst.net.nz>

htdocs/admin/index.php

@@ -73,13 +73,22 @@ $closeform = pieform(array(
     ),
 ));
 
-$smarty = smarty();
+$jsfiles = array();
+if (empty($upgrades)) {
+    $sitedata = site_statistics();
+    if (!empty($sitedata['weekly'])) {
+        $jsfiles = array('js/PlotKit/excanvas.js', 'js/PlotKit/PlotKit.js');
+        $sitedata['dataarray'] = json_encode($sitedata['weekly']);
+    }
+}
+
+$smarty = smarty($jsfiles);
 $smarty->assign('PAGEHEADING', hsc(get_string('administration', 'admin')));
 
 // normal admin page starts here
 $smarty->assign('upgrades', $upgrades);
-if (empty($upgrades)) {
-    $smarty->assign('sitedata', site_statistics());
+if (isset($sitedata)) {
+    $smarty->assign('sitedata', $sitedata);
 }
 
 if (isset($register)) {

htdocs/theme/raw/static/style/admin.css

@@ -164,6 +164,9 @@ input#register_register {
 .site-stats p {
   margin: .1em;
 }
+#site-stats-graph {
+  margin: 0 .3em 1em;
+}
 
 .admin-home-column {
   width: 49%;

htdocs/theme/raw/templates/admin/stats.tpl

-<div class="site-stats">
+<div id="site-stats-graph" class="fr" width="300" height="200">
+</div>
+{if $sitedata.weekly}
+<script type="text/javascript">
+addLoadEvent(function () {literal}{{/literal}
+    EasyPlot('line', {literal}{}{/literal}, $('site-stats-graph'), {$sitedata.dataarray});
+{literal}}{/literal});
+</script>
+{/if}
+<div class="site-stats fl">
 <h5>{$sitedata.name}: {str tag=sitestatistics section=admin}</h5>
 <p><strong>{str tag=users}:</strong> {$sitedata.users}{if $sitedata.rank.users} ({str tag=Rank section=admin}: $sitedata.rank.users}){/if}</p>
 <p><strong>{str tag=groups}:</strong> {$sitedata.groups}{if $sitedata.rank.groups} ({str tag=Rank section=admin}: $sitedata.rank.groups}){/if}</p>
 <p><strong>{str tag=views}:</strong> {$sitedata.views}{if $sitedata.rank.views} ({str tag=Rank section=admin}: $sitedata.rank.views}){/if}</p>
-</div>
\ No newline at end of file
+</div>
+<div class="cb"></div>
\ No newline at end of file