php 產生縮圖:PHP產生智能縮圖

<?php
class resizeimage {
//圖片類型
var $type;
//實際寬度
var $width;
//實際高度
var $height;
//改變後的寬度
var $resize_width;
//改變後的高度
var $resize_height;
//是否裁圖
var $cut;
//源圖象
var $srcimg;
//靶心圖表象地址
var $dstimg;
//臨時建立的圖象
var $im;
function resizeimage($img, $wid, $hei, $c, $dstpath) {
$this->srcimg = $img;
$this->resize_width = $wid;
$this->resize_height = $hei;
$this->cut = $c;
//圖片的類型
$this->type = strtolower ( substr ( strrchr ( $this->srcimg, "." ), 1 ) );
//初始化圖象
$this->initi_img ();
//靶心圖表象地址
$this->dst_img ( $dstpath );
$this->width = imagesx ( $this->im );
$this->height = imagesy ( $this->im );
//產生圖象
$this->newimg ();
ImageDestroy ( $this->im );
}
function newimg() {
//改變後的圖象的比例
$resize_ratio = ($this->resize_width) / ($this->resize_height);
//實際圖象的比例
$ratio = ($this->width) / ($this->height);
if (($this->cut) == "1") //裁圖
{
if ($ratio >= $resize_ratio) //高度優先
{
$newimg = imagecreatetruecolor ( $this->resize_width, $this->resize_height );
imagecopyresampled ( $newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, (($this->height) * $resize_ratio), $this->height );
ImageJpeg ( $newimg, $this->dstimg );
}
if ($ratio < $resize_ratio) //寬度優先
{
$newimg = imagecreatetruecolor ( $this->resize_width, $this->resize_height );
imagecopyresampled ( $newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width) / $resize_ratio) );
ImageJpeg ( $newimg, $this->dstimg );
}
} else //不裁圖
{
if ($ratio >= $resize_ratio) {
$newimg = imagecreatetruecolor ( $this->resize_width, ($this->resize_width) / $ratio );
imagecopyresampled ( $newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width) / $ratio, $this->width, $this->height );
ImageJpeg ( $newimg, $this->dstimg );
}
if ($ratio < $resize_ratio) {
$newimg = imagecreatetruecolor ( ($this->resize_height) * $ratio, $this->resize_height );
imagecopyresampled ( $newimg, $this->im, 0, 0, 0, 0, ($this->resize_height) * $ratio, $this->resize_height, $this->width, $this->height );
ImageJpeg ( $newimg, $this->dstimg );
}
}
}
//初始化圖象
function initi_img() {
if ($this->type == "jpg") {
$this->im = imagecreatefromjpeg ( $this->srcimg );
}
if ($this->type == "gif") {
$this->im = imagecreatefromgif ( $this->srcimg );
}
if ($this->type == "png") {
$this->im = imagecreatefrompng ( $this->srcimg );
}
}
//圖象目標地址
function dst_img($dstpath) { 本文連結http://www.cxybl.com/html/wlbc/Php/20130326/37402.html