php生成缩略图经典类
从国外网站找到的一款php生成缩略图代码,有需要的朋友可以参考一下,代码如下:
<?php /* * File: SimpleImage.php * Author: Simon Jarvis * Copyright: 2006 Simon Jarvis * Date: 08/11/06 * Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details: * http://www.gnu.org/licenses/gpl.html * */ class SimpleImage { var $image; var $image_type; function load($filename) { $image_info = getimagesize($filename); $this->image_type = $image_info[2]; if ($this->image_type == IMAGETYPE_JPEG) { $this->image = imagecreatefromjpeg($filename); } elseif ($this->image_type == IMAGETYPE_GIF) { $this->image = imagecreatefromgif($filename); } elseif ($this->image_type == IMAGETYPE_PNG) { $this->image = imagecreatefrompng($filename); } } function save($filename, $image_type = IMAGETYPE_JPEG, $compression = 75, $permissions = null) { if ($image_type == IMAGETYPE_JPEG) { imagejpeg($this->image, $filename, $compression); } elseif ($image_type == IMAGETYPE_GIF) { imagegif($this->image, $filename); } elseif ($image_type == IMAGETYPE_PNG) { imagepng($this->image, $filename); } if ($permissions != null) { chmod($filename, $permissions); } } function output($image_type = IMAGETYPE_JPEG) { if ($image_type == IMAGETYPE_JPEG) { imagejpeg($this->image); } elseif ($image_type == IMAGETYPE_GIF) { imagegif($this->image); } elseif ($image_type == IMAGETYPE_PNG) { imagepng($this->image); } } function getWidth() { return imagesx($this->image); } function getHeight() { return imagesy($this->image); } function resizeToHeight($height) { $ratio = $height / $this->getHeight(); $width = $this->getWidth() * $ratio; $this->resize($width, $height); } function resizeToWidth($width) { $ratio = $width / $this->getWidth(); $height = $this->getheight() * $ratio; $this->resize($width, $height); } function scale($scale) { $width = $this->getWidth() * $scale / 100; $height = $this->getheight() * $scale / 100; $this->resize($width, $height); } function resize($width, $height) { $new_image = imagecreatetruecolor($width, $height); imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth() , $this->getHeight()); $this->image = $new_image; } } ?>
保存文件作为SimpleImage之上,php和看看以下的例子如何使用脚本,下面的第一个例子将加载一个文件命名图片,jpg调整到250像素宽,400像素高,picture2.jpg重新保存,代码如下:
<?php include ('SimpleImage.php'); $image = new SimpleImage(); $image->load('picture.jpg'); $image->resize(250, 400); $image->save('picture2.jpg'); ?>
如果你想调整specifed宽度但保持尺寸比例相同的脚本可以为你计算出所需的高度,只使用resizeToWidth函数,代码如下:
<?php include ('SimpleImage.php'); $image = new SimpleImage(); $image->load('picture.jpg'); $image->resizeToWidth(250); ?>
教程链接:http://www.phprm.com/tuxiang/fs4426.html
随意转载~但请保留教程地址★