php GD库裁剪、加水印图片处理

<?php// 原始图片$img1 = 'www.jpg';// 水印后的图片$img2 = 'bbbb.jpg';// 水印$water = 'nnn.jpg';$img = new image ();// 等比缩放$res = $img->param ( $img1 )->thumb ( $img1, 40, 40, 0 );// center center 裁剪/* $img->param ( $img1 )->thumb ( './image/test_1.jpg', 200, 200, 1 );// top left 裁剪$img->param ( $img1 )->thumb ( './image/test_2.jpg', 200, 200, 2 );// 右下角添加水印$img->param ( $img1 )->water ( $img2, $water, 9 ); */class image {// 当前图片protected $img;// 图像types 对应表protected $types = array (1 => 'gif',2 => 'jpg',3 => 'png',6 => 'bmp' );public function __construct($img = '') {! $img && $this->param ( $img );}public function param($img) {$this->img = $img;return $this;}public function getImageInfo($img) {$info = @getimagesize ( $img );if (isset ( $this->types [$info [2]] )) {$info ['ext'] = $info ['type'] = $this->types [$info [2]];} else {$info ['ext'] = $info ['type'] = 'jpg';}$info ['type'] == 'jpg' && $info ['type'] = 'jpeg';$info ['size'] = @filesize ( $img );return $info;}// thumb(新图地址, 宽, 高, 裁剪, 允许放大)public function thumb($filename, $new_w = 160, $new_h = 120, $cut = 0, $big = 0) {// 获取原图信息$info = $this->getImageInfo ( $this->img );if (! empty ( $info [0] )) {$old_w = $info [0];$old_h = $info [1];$type = $info ['type'];$ext = $info ['ext'];unset ( $info );// 如果原图比缩略图小 并且不允许放大if ($old_w < $new_h && $old_h < $new_w && ! $big) {return false;}// 裁剪图片if ($cut == 0) { // 等比列$scale = min ( $new_w / $old_w, $new_h / $old_h ); // 计算缩放比例$width = ( int ) ($old_w * $scale); // 缩略图尺寸$height = ( int ) ($old_h * $scale);$start_w = $start_h = 0;$end_w = $old_w;$end_h = $old_h;} elseif ($cut == 1) { // center center 裁剪$scale1 = round ( $new_w / $new_h, 2 );$scale2 = round ( $old_w / $old_h, 2 );if ($scale1 > $scale2) {$end_h = round ( $old_w / $scale1, 2 );$start_h = ($old_h - $end_h) / 2;$start_w = 0;$end_w = $old_w;} else {$end_w = round ( $old_h * $scale1, 2 );$start_w = ($old_w - $end_w) / 2;$start_h = 0;$end_h = $old_h;}$width = $new_w;$height = $new_h;} elseif ($cut == 2) { // left top 裁剪$scale1 = round ( $new_w / $new_h, 2 );$scale2 = round ( $old_w / $old_h, 2 );if ($scale1 > $scale2) {$end_h = round ( $old_w / $scale1, 2 );$end_w = $old_w;} else {$end_w = round ( $old_h * $scale1, 2 );$end_h = $old_h;}$start_w = 0;$start_h = 0;$width = $new_w;$height = $new_h;}// 载入原图$createFun = 'ImageCreateFrom' . $type;$oldimg = $createFun ( $this->img );// 创建缩略图if ($type != 'gif' && function_exists ( 'imagecreatetruecolor' )) {$newimg = imagecreatetruecolor ( $width, $height );} else {$newimg = imagecreate ( $width, $height );}// 复制图片if (function_exists ( "ImageCopyResampled" )) {ImageCopyResampled ( $newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w, $end_h );} else {ImageCopyResized ( $newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w, $end_h );}// 对jpeg图形设置隔行扫描$type == 'jpeg' && imageinterlace ( $newimg, 1 );// 生成图片$imageFun = 'image' . $type;echo $imageFun;! @$imageFun ( $newimg, $filename ) && die ( '保存失败!检查目录是否存在并且可写?' );ImageDestroy ( $newimg );ImageDestroy ( $oldimg );return $filename;}return false;}// water(保存地址,水印图片,水印位置,透明度)public function water($filename, $water, $pos = 0, $pct = 80) {// 加载水印图片$info = $this->getImageInfo ( $water );if (! empty ( $info [0] )) {$water_w = $info [0];$water_h = $info [1];$type = $info ['type'];$fun = 'imagecreatefrom' . $type;$waterimg = $fun ( $water );} else {return false;}// 加载背景图片$info = $this->getImageInfo ( $this->img );if (! empty ( $info [0] )) {$old_w = $info [0];$old_h = $info [1];$type = $info ['type'];$fun = 'imagecreatefrom' . $type;$oldimg = $fun ( $this->img );} else {return false;}// 剪切水印$water_w > $old_w && $water_w = $old_w;$water_h > $old_h && $water_h = $old_h;// 水印位置switch ($pos) {case 0 : // 随机$posX = rand ( 0, ($old_w - $water_w) );$posY = rand ( 0, ($old_h - $water_h) );break;case 1 : // 1为顶端居左$posX = 0;$posY = 0;break;case 2 : // 2为顶端居中$posX = ($old_w - $water_w) / 2;$posY = 0;break;case 3 : // 3为顶端居右$posX = $old_w - $water_w;$posY = 0;break;case 4 : // 4为中部居左$posX = 0;$posY = ($old_h - $water_h) / 2;break;case 5 : // 5为中部居中$posX = ($old_w - $water_w) / 2;$posY = ($old_h - $water_h) / 2;break;case 6 : // 6为中部居右$posX = $old_w - $water_w;$posY = ($old_h - $water_h) / 2;break;case 7 : // 7为底端居左$posX = 0;$posY = $old_h - $water_h;break;case 8 : // 8为底端居中$posX = ($old_w - $water_w) / 2;$posY = $old_h - $water_h;break;case 9 : // 9为底端居右$posX = $old_w - $water_w;$posY = $old_h - $water_h;break;default : // 随机$posX = rand ( 0, ($old_w - $water_w) );$posY = rand ( 0, ($old_h - $water_h) );break;}// 设定图像的混色模式imagealphablending ( $oldimg, true );// 添加水印imagecopymerge ( $oldimg, $waterimg, $posX, $posY, 0, 0, $water_w, $water_h, $pct );$fun = 'image' . $type;! @$fun ( $oldimg, $filename ) && die ( '保存失败!检查目录是否存在并且可写?' );imagedestroy ( $oldimg );imagedestroy ( $waterimg );return $filename;}}?>