Fix (web): Fix player trend graph to refresh according to IMAGE_UPDATE_INTERVAL

Author: Rushaway

web/trend_graph.php

@@ -94,9 +94,13 @@
 	$cache_image = IMAGE_PATH . "/progress/trend_{$player}_{$last_time}.png";
 	if (file_exists($cache_image))
 	{
-		header('Content-type: image/png');
-		readfile($cache_image);
-		exit();
+		$file_timestamp = @filemtime($cache_image);
+		if ($file_timestamp + IMAGE_UPDATE_INTERVAL > time()) {
+			header('Content-type: image/png');
+			// header("Cache-Control: public, s-maxage=" . IMAGE_UPDATE_INTERVAL . ", max-age=" . IMAGE_UPDATE_INTERVAL); // Cache it in the browser
+			readfile($cache_image);
+			exit();
+		}
 	}
 
 	$Chart = new pChart(380, 200);
@@ -154,7 +158,9 @@
 			0, 0, 0, 0, 0, 0, $color['red'], $color['green'], $color['blue'], FALSE);
 	}
 
-	$cache_image = IMAGE_PATH . "/progress/trend_{$player}_{$last_time}.png";
 	$Chart->Render($cache_image);
-	header("Location: $cache_image");
+	// header("Location: $cache_image");
+	header('Content-type: image/png');
+	// header("Cache-Control: public, s-maxage=" . IMAGE_UPDATE_INTERVAL . ", max-age=" . IMAGE_UPDATE_INTERVAL); // Cache it in the browser
+	readfile($cache_image);
 ?>