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★