Visual enhancements

[weathermon.git] / web / image.php

diff --git a/web/image.php b/web/image.php
index 2a2d2f395415114b0e24efbce8f01c6f6c1980ff..0e513a1e2fe2ff39f73a28b1b8e7fc2929911e74 100644 (file)
--- a/web/image.php
+++ b/web/image.php
@@ -16,6 +16,15 @@ if (! ($db = new PDO("mysql:host=$mysql_host;port=$mysql_port;dbname=$mysql_sche
 
 }  
 
+$supported = imagetypes();
+if( $supported & IMG_PNG )    $img_format="png";
+elseif( $supported & IMG_GIF ) $img_format="gif";
+elseif( $supported & IMG_JPG ) $img_format="jpeg";
+elseif( $supported & IMG_WBMP ) $img_format="wbmp";
+elseif( $supported & IMG_XPM ) $img_format="xpm";
+
+$cachefilename = NULL;
+
 $db -> exec('SET CHARACTER SET utf8');
   
 $type = $_REQUEST['type'];
@@ -77,9 +86,17 @@ if ($type and $param) {
     
   } elseif ($type == 'range') {
 
+    $curr = intval(date('YmdHis'));
+
     $from = intval($_REQUEST['fromdate']);
     $to = intval($_REQUEST['todate']);
 
+    if ($curr>$to) {
+    
+        $cachefilename='meteo.'.$sensor.'.'.$param.'.'.$to_unit.'.'.$from.'-'.$to.'.'.$img_format;
+    
+    }
+
     $q = $db -> prepare(
       'select unix_timestamp(timestamp) as x,unitconv(value,'.$from_unit.','.$to_unit.') as y from sensor_values where timestamp>=str_to_date("'.$from.'","%Y%m%d%H%i%s") and timestamp<=str_to_date("'.$to.'","%Y%m%d%H%i%s") and sensor_id='.$sensor.' and parameter_id='.$param.' order by timestamp'
     );
@@ -88,6 +105,22 @@ if ($type and $param) {
   
   }
 
+  $g = new Graph(640,480);
+  
+  if ($cachefilename) {
+      if ($g->cache->IsValid($cachefilename)) {
+  
+          $g->cache->StreamImgFile($g->img,$cachefilename);
+          return;
+  
+      } else {
+      
+          $timeout = 8640000;
+          $g->SetupCache($cachefilename,$timeout);
+      
+      }
+  }
+
   $q -> execute();
     
   while ($row = $q -> fetch(PDO::FETCH_ASSOC)) {
@@ -102,7 +135,7 @@ if ($type and $param) {
 
     $total_weight=0;
     $sum=0;
-    $maxdelta = 900;
+    $maxdelta = 1800;
     
     for ($j = $i; $j < count($xdata); ++$j) {
     
@@ -132,16 +165,16 @@ if ($type and $param) {
   }
 
   // Create the graph
-  $g = new Graph(640,480);
   $g->graph_theme = null;
 
-  //$g->img->SetAntiAliasing();
+  $g->img->SetAntiAliasing();
 
-  // We need a linlin scale since we provide both
-  // x and y coordinates for the data points.
+  // We need a datlin scale since we provide both
+  // x and y coordinates for the data points, but x is unix timestamp.
   $g->SetScale('datlin');
   $g->xaxis->SetLabelAngle(90);
   $g->xaxis->SetPos("min");
+  $g->xaxis->scale->SetTimeAlign( HOURADJ_1 );
 
   // We use a scatterplot to illustrate the original
   // contro points.
@@ -164,6 +197,11 @@ if ($type and $param) {
   $g->title->SetFont(FF_DV_SANSSERIF,FS_BOLD,12);
   $g->SetMarginColor('silver');
 
+  $g->xgrid->Show();
+  $g->xgrid->SetLineStyle('dotted');
+  $g->ygrid->Show();
+  $g->ygrid->SetLineStyle('dotted');
+
   // Add the plots to the graph and stroke
   $g->Stroke();