- <?php
- class slpic {
- //原图片文件,包含路径和文件名
- var $orpic;
- //原图的临时图像
- var $tempic;
- //缩略图
- var $thpic;
- //原宽度
- var $width;
- //原高度
- var $height;
- //图片类型
- var $type;
- //缩略后的宽度
- var $thwidth;
- //缩略后的高度
- var $thheight;
- function __construct($file){
- $this->orpic = $file;
- $infos = getimagesize($file);
- $this->width = $infos[0];
- $this->height = $infos[1];
- $this->type = $infos[2];
- }
- //根据用户所指定最大宽高来计算缩略图尺寸
- function cal_size($maxwidth, $maxheight){
- //缩略图最大宽度与最大高度比
- $thcrown = $maxwidth/$maxheight;
- //原图宽高比
- $crown = $this->width/$this->height;
- if($crown/$thcrown >= 1){
- $this->thwidth = $maxwidth;
- $this->thheight = $maxwidth/$crown;
- } else {
- $this->thheight = $maxheight;
- $this->thwidth = $maxheight*$crown;
- }
- }
- function init(){
- switch($this->type){
- case 1: //GIF
- $this->tempic = imagecreatefromgif($this->orpic);
- break;
- case 2: //JPG
- $this->tempic = imagecreatefromjpeg($this->orpic);
- break;
- case 3: //PNG
- $this->tempic = imagecreatefrompng($this->orpic);
- break;
- default:
- echo '暂不支持该图片格式';
- }
- }
- function resize($maxwidth, $maxheight){
- //初始化图像
- $this->init();
- //计算出缩略图尺寸
- $this->cal_size($maxwidth, $maxheight);
- $this->thpic = imagecreatetruecolor($this->thwidth, $this->thheight);
- imagecopyresampled($this->thpic, $this->tempic, 0, 0, 0 ,0, $this->thwidth, $this->thheight, $this->width, $this->height);
- }
- function save($filename, $type){
- switch($type){
- case 'jpg':
- case 'jpeg':
- imagejpeg($this->thpic, $filename);
- break;
- case 'png':
- imagepng($$this->thpic, $filename);
- break;
- case 'gif':
- imagegif($$this->thpic, $filename);
- break;
- default:
- echo '暂不支持您所选择的格式';
- }
- }
- }
- ?>
- //该片段来自于http://www.codesnippet.cn/detail/081120136982.html
来源: http://www.codesnippet.cn/detail/081120136982.html