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<?php /** * Image.php * author: F.X * date: 2017 * description 图像类 */ namespace Imooc\Lib; require_once 'GDBasic.php'; class Image extends GDBasic { protected $_width; protected $_height; protected $_im; protected $_type; protected $_mime; protected $_real_path; public function __construct($file) { //检查GD库 self::check(); $imageInfo = $this->createImageByFile($file); $this->_width = $imageInfo['width']; $this->_height = $imageInfo['height']; $this->_im = $imageInfo['im']; $this->_type = $imageInfo['type']; $this->_real_path = $imageInfo['real_path']; $this->_mime = $imageInfo['mime']; } /** * 根据文件创建图像 * @param $file * @return array * @throws \Exception */ public function createImageByFile($file) { //检查文件是否存在 if(!file_exists($file)) { throw new \Exception('file is not exits'); } //获取图像信息 $imageInfo = getimagesize($file); $realPath = realpath($file); if(!$imageInfo) { throw new \Exception('file is not image file'); } switch($imageInfo[2]) { case IMAGETYPE_GIF: $im = imagecreatefromgif($file); break; case IMAGETYPE_JPEG: $im = imagecreatefromjpeg($file); break; case IMAGETYPE_PNG: $im = imagecreatefrompng($file); break; default: throw new \Exception('image file must be png,jpeg,gif'); } return array( 'width' => $imageInfo[0], 'height' => $imageInfo[1], 'type' => $imageInfo[2], 'mime' => $imageInfo['mime'], 'im' => $im, 'real_path' => $realPath, ); } /** * 缩略图 * @param int $width 缩略图高度 * @param int $height 缩略图宽度 * @return $this * @throws \Exception */ public function resize($width, $height) { if(!is_numeric($width) || !is_numeric($height)) { throw new \Exception('image width or height must be number'); } //根据传参的宽高获取最终图像的宽高 $srcW = $this->_width; $srcH = $this->_height; if($width <= 0 || $height <= 0) { $desW = $srcW;//缩略图高度 $desH = $srcH;//缩略图宽度 } else { $srcP = $srcW / $srcH;//宽高比 $desP = $width / $height; if($width > $srcW) { if($height > $srcH) { $desW = $srcW; $desH = $srcH; } else { $desH = $height; $desW = round($desH * $srcP); } } else { if($desP > $srcP) { $desW = $width; $desH = round($desW / $srcP); } else { $desH = $height; $desW = round($desH * $srcP); } } } //PHP版本小于5.5 if(version_compare(PHP_VERSION, '5.5.0', '<')) { $desIm = imagecreatetruecolor($desW, $desH); if(imagecopyresampled($desIm, $this->_im, 0, 0, 0, 0, $desW, $desH, $srcW, $srcH)) { imagedestroy($this->_im); $this->_im = $desIm; $this->_width = imagesx($this->_im); $this->_height = imagesy($this->_im); } } else { if($desIm = imagescale($this->_im, $desW, $desH)) { $this->_im = $desIm; $this->_width = imagesx($this->_im); $this->_height = imagesy($this->_im); } } return $this; } /** * 根据百分比生成缩略图 * @param int $percent 1-100 * @return Image * @throws \Exception */ public function resizeByPercent($percent) { if(intval($percent) <= 0) { throw new \Exception('percent must be gt 0'); } $percent = intval($percent) > 100 ? 100 : intval($percent); $percent = $percent / 100; $desW = $this->_width * $percent; $desH = $this->_height * $percent; return $this->resize($desW, $desH); } /** * 图像旋转 * @param $degree * @return $this */ public function rotate($degree) { $degree = 360 - intval($degree); $back = imagecolorallocatealpha($this->_im,0,0,0,127); $im = imagerotate($this->_im,$degree,$back,1); imagesavealpha($im,true); imagedestroy($this->_im); $this->_im = $im; $this->_width = imagesx($this->_im); $this->_height = imagesy($this->_im); return $this; } /** * 生成水印 * @param file $water 水印图片 * @param int $pct 透明度 * @return $this */ public function waterMask($water ='',$pct = 60 ) { //根据水印图像文件生成图像资源 $waterInfo = $this->createImageByFile($water); imagecopymerge(); //销毁$this->_im $this->_im = $waterInfo['im']; $this->_width = imagesx($this->_im); $this->_height = imagesy($this->_im); return $this; } /** * 图片输出 * @return bool */ public function show() { header('Content-Type:' . $this->_mime); if($this->_type == 1) { imagegif($this->_im); return true; } if($this->_type == 2) { imagejpeg($this->_im, null, 80); return true; } if($this->_type == 3) { imagepng($this->_im); return true; } } /** * 保存图像文件 * @param $file * @param null $quality * @return bool * @throws \Exception */ public function save($file, $quality = null) { //获取保存目的文件的扩展名 $ext = pathinfo($file, PATHINFO_EXTENSION); $ext = strtolower($ext); if(!$ext || !in_array($ext, array('jpg', 'jpeg', 'gif', 'png'))) { throw new \Exception('image save file must be jpg ,png,gif'); } if($ext === 'gif') { imagegif($this->_im, $file); return true; } if($ext === 'jpeg' || $ext === 'jpg') { if($quality > 0) { if($quality < 1) { $quality = 1; } if($quality > 100) { $quality = 100; } imagejpeg($this->_im, $file, $quality); } else { imagejpeg($this->_im, $file); } return true; } if($ext === 'png') { imagepng($this->_im, $file); return true; } } } |
