PHP中简单图片处理类
在PHP开发中,对图片的处理很重要. 尤其是压缩图片,给图片加水印.这个段函数很简单,但是很实用.就是给图片加水印, 获取缩略图等.
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/* * 作者: 雪狐博客 * 类用途: 处理图片,包括加水印等 **/ final class Image { private $file; private $image; private $info; public function __construct($file) { if (file_exists($file)) { $this->file = $file; $info = getimagesize($file); $this->info = array( 'width' => $info[0], 'height' => $info[1], 'bits' => $info['bits'], 'mime' => $info['mime'] ); $this->image = $this->create($file); } else { exit('Error: Could not load image ' . $file . '!'); } } private function create($image) { $mime = $this->info['mime']; if ($mime == 'image/gif') { return imagecreatefromgif($image); } elseif ($mime == 'image/png') { return imagecreatefrompng($image); } elseif ($mime == 'image/jpeg') { return imagecreatefromjpeg($image); } } public function save($file, $quality = 100) { $info = pathinfo($file); $extension = $info['extension']; if ($extension == ('jpeg' || 'jpg')) { imagejpeg($this->image, $file, $quality); } elseif($extension == 'png') { imagepng($this->image, $file, 0); } elseif($extension == 'gif') { imagegif($this->image, $file); } imagedestroy($this->image); } public function resize($width = 0, $height = 0) { if (!$this->info['width'] || !$this->info['height']) { return; } $xpos = 0; $ypos = 0; $scale = min($width / $this->info['width'], $height / $this->info['height']); if ($scale == 1) { return; } $new_width = (int)($this->info['width'] * $scale); $new_height = (int)($this->info['height'] * $scale); $xpos = (int)(($width - $new_width) / 2); $ypos = (int)(($height - $new_height) / 2); $image_old = $this->image; $this->image = imagecreatetruecolor($width, $height); $background = imagecolorallocate($this->image, 255, 255, 255); imagefilledrectangle($this->image, 0, 0, $width, $height, $background); imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width, $new_height, $this->info['width'], $this->info['height']); imagedestroy($image_old); $this->info['width'] = $width; $this->info['height'] = $height; } public function watermark($file, $position = 'bottomright') { $watermark = $this->create($file); $watermark_width = imagesx($watermark); $watermark_height = imagesy($watermark); switch($position) { case 'topleft': $watermark_pos_x = 0; $watermark_pos_y = 0; break; case 'topright': $watermark_pos_x = $this->info['width'] - $watermark_width; $watermark_pos_y = 0; break; case 'bottomleft': $watermark_pos_x = 0; $watermark_pos_y = $this->info['height'] - $watermark_height; break; case 'bottomright': $watermark_pos_x = $this->info['width'] - $watermark_width; $watermark_pos_y = $this->info['height'] - $watermark_height; break; } imagecopy($this->image, $watermark, $watermark_pos_x, $watermark_pos_y, 0, 0, 120, 40); imagedestroy($watermark); } public function crop($top_x, $top_y, $bottom_x, $bottom_y) { $image_old = $this->image; $this->image = imagecreatetruecolor($bottom_x - $top_x, $bottom_y - $top_y); imagecopy($this->image, $image_old, 0, 0, $top_x, $top_y, $this->info['width'], $this->info['height']); imagedestroy($image_old); $this->info['width'] = $bottom_x - $top_x; $this->info['height'] = $bottom_y - $top_y; } public function rotate($degree, $color = 'FFFFFF') { $rgb = $this->html2rgb($color); $this->image = imagerotate($this->image, $degree, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2])); $this->info['width'] = imagesx($this->image); $this->info['height'] = imagesy($this->image); } private function filter($filter) { imagefilter($this->image, $filter); } private function text($text, $x = 0, $y = 0, $size = 5, $color = '000000') { $rgb = $this->html2rgb($color); imagestring($this->image, $size, $x, $y, $text, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2])); } private function merge($file, $x = 0, $y = 0, $opacity = 100) { $merge = $this->create($file); $merge_width = imagesx($image); $merge_height = imagesy($image); imagecopymerge($this->image, $merge, $x, $y, 0, 0, $merge_width, $merge_height, $opacity); } private function html2rgb($color) { if ($color[0] == '#') { $color = substr($color, 1); } if (strlen($color) == 6) { list($r, $g, $b) = array($color[0] . $color[1], $color[2] . $color[3], $color[4] . $color[5]); } elseif (strlen($color) == 3) { list($r, $g, $b) = array($color[0] . $color[0], $color[1] . $color[1], $color[2] . $color[2]); } else { return FALSE; } $r = hexdec($r); $g = hexdec($g); $b = hexdec($b); return array($r, $g, $b); } } |