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<?php |
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// $Id: graphstat_render.inc,v 1.13.2.1 2009/01/25 14:32:28 profix898 Exp $ |
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function graphstat_render_graph($group, $key) { |
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global $user; |
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$filter = isset($_SESSION['graphstat_filter'][$group]) ? $_SESSION['graphstat_filter'][$group] : NULL; |
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$cache = cache_get('graphstat:'. $user->uid); |
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$width = $cache ? $cache->data['width'] : 500; |
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$height = $cache ? $cache->data['height'] : 300; |
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$time = format_date(time(), 'custom', 'H'); |
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|
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$cid = 'graphstat:'. md5($group . $key . $filter) .':'. $width .':'. $time; |
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if ($cache = cache_get($cid)) { |
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$image = $cache->data; |
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} |
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else { |
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// Cache Miss: we need to generate the graphs from scratch |
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$graphs = module_invoke_all('graphstat'); |
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$graphs = $graphs[$group]; |
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$data = module_invoke_all('graphstat_data'); |
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$data = isset($data[$group]) ? $data[$group] : array(); |
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// If a filter is defined then invoke the callback function |
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// to fetch the filtered graph data |
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if (isset($graphs['#filter'])) { |
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$function = $graphs['#filter']['#callback']; |
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if (function_exists($function)) { |
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$function($data, $filter); |
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} |
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} |
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$data = isset($data[$key]) ? $data[$key] : array(); |
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// If no graph data available then render a placeholder image |
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if (empty($data)) { |
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if (function_exists('imagepng')) { |
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$img = imagecreate($width, $height); |
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imagefill($img, 0, 0, imagecolorallocate($img, 240, 240, 240)); |
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imageline($img, 0, 0, $width, $height, imagecolorallocate($img, 128, 128, 128)); |
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imageline($img, 0, $height, $width, 0, imagecolorallocate($img, 128, 128, 128)); |
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imagepng($img); |
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imagedestroy($img); |
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} |
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exit(); |
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} |
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// |
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$renderer = variable_get('graphstat_renderer', 'graphstat'); |
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$graph = module_invoke($renderer, 'graphstat_renderer', $graphs[$key], $data, $width, $height); |
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// |
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if (is_array($graph)) { |
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$image = $graph['image']; |
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if (isset($graph['#type'])) { |
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drupal_set_header($graph['#type']); |
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} |
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} |
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else { |
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$image = $graph; |
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drupal_set_header('Content-type: image/png'); |
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} |
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// Put $image into the cache |
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cache_set($cid, $image, 'cache', CACHE_TEMPORARY); |
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} |
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// Print out the image and make sure to exit immediatly |
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print $image; |
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exit(); |
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} |
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/** |
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* Implementation of hook_graphstat_renderer(). |
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* (renders the actual graph images, in this case with the PHPLOT library) |
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*/ |
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function graphstat_graphstat_renderer($graph, $data, $width, $height) { |
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require_once(drupal_get_path('module', 'graphstat') .'/phplot.php'); |
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// Create instance of PHPLOT and configure graph paramters |
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$plot =& new PHPlot($width, $height); |
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$graph['#type'] = isset($graph['#type']) ? $graph['#type'] : 'linepoints'; |
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$plot->SetPlotType($graph['#type']); |
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$plot->SetTitle(isset($graph['#title']) ? $graph['#title'] : ''); |
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$plot->SetXTitle(isset($graph['#xlabel']) ? $graph['#xlabel'] : ''); |
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$plot->SetXTickLabelPos('none'); |
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$plot->SetYTitle(isset($graph['#ylabel']) ? $graph['#ylabel'] : ''); |
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$plot->SetXLabelAngle(90); |
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if (isset($graph['#legend'])) { |
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$plot->SetLegend($graph['#legend']); |
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} |
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// Push graph data into the plot renderer |
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if (!is_array(current($data))) { |
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$series = $data; |
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$data = array(); |
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foreach ($series as $x => $y) { |
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$data[] = array($x, $y); |
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} |
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} |
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$plot->SetDataValues($data); |
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// Draw the graph into a buffer $image |
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ob_start(); |
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$plot->DrawGraph(); |
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$image = ob_get_contents(); |
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ob_end_clean(); |
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return $image; |
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} |
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