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snipts » gd 
showing 1-4 of 4 snipts for gd
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∞ scale and crop an image to best fit a defined set of dimensions
function autoCrop($file, $height, $width){ //load the image file $img = false; $img = imagecreatefromjpeg($file); //quit if not loaded if(!$img){ return false; } //get the image dimensions $curr = @getimagesize($file); $perc_w = $width / $curr[0]; $perc_h = $height / $curr[1]; if(($width > $curr[0]) || ($height > $curr[1])){ return; } if($perc_h > $perc_w){ //taller $width = $width; $height = round($curr[1] * $perc_w); } else { //wider $height = $height; $width = round($curr[0] * $perc_h); } //output $nwimg = imagecreatetruecolor($width, $height); imagecopyresampled($nwimg, $img, 0, 0, 0, 0, $width, $height, $curr[0], $curr[1]); imagejpeg($nwimg, $file); imagedestroy($nwimg); imagedestroy($img); }
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∞ PNG transparent 1x1px generator
<?php /***************************************************************** * Script for automatic generation of one pixel * alpha-transparent images for non-RGBA browsers. * @author Lea Verou * @version 1.0 beta * Licensed under a MIT license *****************************************************************/ ######## SETTINGS ############################################################## /** * Enter the directory in which to store cached color images. * This should be relative and SHOULD contain a trailing slash. * The directory you specify should exist and be writeable (CHMOD 666 or 777). * If you want to store the pngs at the same directory, leave blank (''). */ define('COLORDIR', 'rgba/'); /** * If you requently use a color with varying alphas, you can name it * below, to save you some typing and make your CSS easier to read. */ $color_names = array( 'white' => array(255,255,255), 'black' => array(0,0,0) // , 'mycolor' => array(red value, green value, blue value) ); /** * If you don't want the generated pngs to be stored in the server, set the following to * false. This is STRONGLY NOT RECOMMENDED. It's here only for testing/debugging purposes. */ define('CACHEPNGS', true); ######## NO FURTHER EDITING, UNLESS YOU REALLY KNOW WHAT YOU'RE DOING ########## $dir = substr(COLORDIR,0,strlen(COLORDIR)-1); if(!is_writable($dir)) { die("The directory '$dir' either doesn't exist or isn't writable."); } $rgb = $color_names[$_GET['name']]; $red = is_array($rgb)? $rgb[0] : intval($_GET['r']); $green = is_array($rgb)? $rgb[1] : intval($_GET['g']); $blue = is_array($rgb)? $rgb[2] : intval($_GET['b']); $alphaurl = $_GET['a']; // "A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent." // http://www.php.net/manual/en/function.imagecolorallocatealpha.php $alpha = intval(127 - 127 * ($alphaurl / 100)); // Does it already exist? $filepath = COLORDIR . "r{$red}_g{$green}_b{$blue}_a{$alphaurl}.png"; if(/*CACHEPNGS and */file_exists($filepath)) { $url = "http://{$_SERVER['HTTP_HOST']}/{$filepath}"; header("Status: 301"); die(header("Location: {$url}")); } else { // Send headers header('Content-Type: image/png'); header("Expires: ".gmdate("D, d M Y H:i:s", strtotime('+5 years'))." GMT"); $img = @imagecreatetruecolor(1,1) or die('Cannot Initialize new GD image stream'); // This is to allow the final image to have actual transparency // http://www.php.net/manual/en/function.imagesavealpha.php imagealphablending($img, false); imagesavealpha($img, true); // Allocate our requested color $color = imagecolorallocatealpha($img, $red, $green, $blue, $alpha); // Fill the image with it imagefill($img,0,0,$color); // Save the file imagepng($img,$filepath,0,NULL); // Serve the file imagepng($img); flush(); // Free up memory imagedestroy($img); } ?>
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∞ Symfony - Action for text image generation (using GD)
<?php public function executeGenerateText (sfWebRequest $request) { $font = '/images/ROTISSAS.TTF'; $bbox = imageftbbox(20, 0, $font, $this->getRequestParameter('text') ); $width = $bbox[2] - $bbox[0] + 10; $height = $bbox[1] - $bbox[7] + 10; $im = imagecreatetruecolor($width, $height); $black = imagecolorallocate($im, 0, 0, 0); $white = imagecolorallocate($im, 255, 255, 255); // Set the background to be white // Path to our font file // First we create our bounding box imagefilledrectangle($im, 0, 0, $width, $height, $black); // This is our cordinates for X and Y $x = $bbox[0] + (imagesx($im) / 2) - ($bbox[4] / 2); //$y = $bbox[1] + (imagesy($im) / 2) - ($bbox[5] / 2) + 3 ; $y = 28; imagefttext($im, 20, 0, 0, $y, $white, $font, $this->getRequestParameter('text')); // Output to browser header('Content-type: image/png'); imagepng($im); imagedestroy($im); return sfView::NONE; }//executeGenerateText ?> # USAGE <img src="<? echo url_for('modulename/generateText?text=My text'); ?>" alt="" title="" />
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∞ Proportional image resizing
function resize_image( $file, $width = 0, $height = 0, $proportional = false, $output = 'file', $delete_original = true ) { if ( $height <= 0 && $width <= 0 ) return false; $info = getimagesize($file); $image = ''; $final_width = 0; $final_height = 0; list($width_old, $height_old) = $info; if ($proportional) { if ($width == 0) $factor = $height/$height_old; elseif ($height == 0) $factor = $width/$width_old; else $factor = min ( $width / $width_old, $height / $height_old); $final_width = round ($width_old * $factor); $final_height = round ($height_old * $factor); } else { $final_width = ( $width <= 0 ) ? $width_old : $width; $final_height = ( $height <= 0 ) ? $height_old : $height; } switch ($info[2]) { case IMAGETYPE_GIF: $image = imagecreatefromgif($file); break; case IMAGETYPE_JPEG: $image = imagecreatefromjpeg($file); break; case IMAGETYPE_PNG: $image = imagecreatefrompng($file); break; default: return false; } $image_resized = imagecreatetruecolor( $final_width, $final_height ); if(($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG)) { $trnprt_indx = imagecolortransparent($image); // If we have a specific transparent color if($trnprt_indx >= 0) { // Get the original image's transparent color's RGB values $trnprt_color = imagecolorsforindex($image, $trnprt_indx); // Allocate the same color in the new image resource $trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']); // Completely fill the background of the new image with allocated color. imagefill($image_resized, 0, 0, $trnprt_indx); // Set the background color for new image to transparent imagecolortransparent($image_resized, $trnprt_indx); } // Always make a transparent background color for PNGs that don't have one allocated already elseif ($info[2] == IMAGETYPE_PNG) { // Turn off transparency blending (temporarily) imagealphablending($image_resized, false); // Create a new transparent color for image $color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127); // Completely fill the background of the new image with allocated color. imagefill($image_resized, 0, 0, $color); // Restore transparency blending imagesavealpha($image_resized, true); } } imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old); if($delete_original) @unlink($file); switch (strtolower($output)) { case 'browser': $mime = image_type_to_mime_type($info[2]); header("Content-type: $mime"); $output = NULL; break; case 'file': $output = $file; break; case 'return': return $image_resized; break; default: break; } switch ($info[2]) { case IMAGETYPE_GIF: imagegif($image_resized, $output); break; case IMAGETYPE_JPEG: imagejpeg($image_resized, $output); break; case IMAGETYPE_PNG: imagepng($image_resized, $output); break; default: return false; } return true; }
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