php全功能无变形图片裁剪(转)

转载自:http://hi.baidu.com/microji/item/548d23dbfda6d93be2108f03

很久以前写了一个php图片任意图片无变形裁剪到指定大小,发布在CSDN博客上,后来被phpchina采集去了,程序有明显漏洞,现在修改了一下,在扩展一些功能,如果需要图片裁剪,或生成缩略图,这个基本上没有问题,全部需要的功能都在里面,全部都是无变形的。

这里我划分为四种模式:
1,任意图片裁剪到指定大小,超过的,剧中裁剪,并且最大化缩放,不够的拉伸,
2,超过的剧中裁剪,而不足的,不拉伸,即只缩小,不放大裁剪,会产生补白,可以用png透明度来消除
3,保留全部图片信息。不裁剪,只缩放,不足的补白。
4,保留全部图片信息。不裁剪,只缩放,不足的不补白,产生的图片为实际有效像素大小,例如有个图片是600X600 现在要生成 120X100 那么缩放后的实际有效像素为100X100,所以只生成100X100的图片,而第三种模式则生成120X100的大小,并且有补白

全部代码:

<?php
 
 
/**
* Author : smallchicken
* Time   : 2009年6月8日16:46:05
* mode 1 : 强制裁剪,生成图片严格按照需要,不足放大,超过裁剪,图片始终铺满
* mode 2 : 和1类似,但不足的时候 不放大 会产生补白,可以用png消除。
* mode 3 : 只缩放,不裁剪,保留全部图片信息,会产生补白,
* mode 4 : 只缩放,不裁剪,保留全部图片信息,生成图片大小为最终缩放后的图片有效信息的实际大小,不产生补白
* 默认补白为白色,如果要使补白成透明像素,请使用SaveAlpha()方法代替SaveImage()方法
*
* 调用方法:
*
* $ic=new ImageCrop('old.jpg','afterCrop.jpg');
* $ic->Crop(120,80,2);
* $ic->SaveImage();
*        //$ic->SaveAlpha();将补白变成透明像素保存
* $ic->destory();
* 
*
*/
class ImageCrop{
 
var $sImage;
var $dImage;
var $src_file;
var $dst_file;
var $src_width;
var $src_height;
var $src_ext;
var $src_type;
 
function ImageCrop($src_file,$dst_file=''){
$this->src_file=$src_file;
$this->dst_file=$dst_file;
$this->LoadImage();
}
 
function SetSrcFile($src_file){
$this->src_file=$src_file;
}
 
function SetDstFile($dst_file){
$this->dst_file=$dst_file;
}
 
function LoadImage(){
list($this->src_width, $this->src_height, $this->src_type) = getimagesize($this->src_file);
switch($this->src_type) {
case IMAGETYPE_JPEG :
$this->sImage=imagecreatefromjpeg($this->src_file);
$this->ext='jpg';
break;
case IMAGETYPE_PNG :
$this->sImage=imagecreatefrompng($this->src_file);
$this->ext='png';
break;
case IMAGETYPE_GIF :
$this->sImage=imagecreatefromgif($this->src_file);
$this->ext='gif';
break;
default:
exit();
}
}
 
function SaveImage($fileName=''){
$this->dst_file=$fileName ? $fileName : $this->dst_file;
switch($this->src_type) {
case IMAGETYPE_JPEG :
imagejpeg($this->dImage,$this->dst_file,100);
break;
case IMAGETYPE_PNG :
imagepng($this->dImage,$this->dst_file);
break;
case IMAGETYPE_GIF :
imagegif($this->dImage,$this->dst_file);
break;
default:
break;
}
}
 
function OutImage(){
switch($this->src_type) {
case IMAGETYPE_JPEG :
header('Content-type: image/jpeg');
imagejpeg($this->dImage);
break;
case IMAGETYPE_PNG :
header('Content-type: image/png');
imagepng($this->dImage);
break;
case IMAGETYPE_GIF :
header('Content-type: image/gif');
imagegif($this->dImage);
break;
default:
break;
}
}
 
function SaveAlpha($fileName=''){
$this->dst_file=$fileName ? $fileName . '.png' : $this->dst_file .'.png';
imagesavealpha($this->dImage, true);
imagepng($this->dImage,$this->dst_file);
}
 
function OutAlpha(){
imagesavealpha($this->dImage, true);
header('Content-type: image/png');
imagepng($this->dImage);
}    
 
function destory(){
imagedestroy($this->sImage);
imagedestroy($this->dImage);
}
 
function Crop($dst_width,$dst_height,$mode=1,$dst_file=''){
if($dst_file) $this->dst_file=$dst_file;
$this->dImage = imagecreatetruecolor($dst_width,$dst_height);
 
$bg = imagecolorallocatealpha($this->dImage,255,255,255,127);
imagefill($this->dImage, 0, 0, $bg);
imagecolortransparent($this->dImage,$bg);
 
$ratio_w=1.0 * $dst_width / $this->src_width;
$ratio_h=1.0 * $dst_height / $this->src_height;
$ratio=1.0;
switch($mode){
case 1:        // always crop
if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)){
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($dst_width / $ratio);
$tmp_h = (int)($dst_height / $ratio);
$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);
$src_x = (int) (($this->src_width-$tmp_w)/2) ; 
$src_y = (int) (($this->src_height-$tmp_h)/2) ;    
imagecopy($tmp_img, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);    
imagecopyresampled($this->dImage,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h);
imagedestroy($tmp_img);
}else{
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($this->src_width * $ratio);
$tmp_h = (int)($this->src_height * $ratio);
$tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h);
imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);
$src_x = (int)($tmp_w - $dst_width) / 2 ; 
$src_y = (int)($tmp_h - $dst_height) / 2 ;    
imagecopy($this->dImage, $tmp_img, 0,0,$src_x,$src_y,$dst_width,$dst_height);
imagedestroy($tmp_img);
}
break;
case 2:        // only small
if($ratio_w < 1 && $ratio_h < 1){
$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($dst_width / $ratio);
$tmp_h = (int)($dst_height / $ratio);
$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);
$src_x = (int) ($this->src_width-$tmp_w)/2 ; 
$src_y = (int) ($this->src_height-$tmp_h)/2 ;    
imagecopy($tmp_img, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);    
imagecopyresampled($this->dImage,$tmp_img,0,0,0,0,$dst_width,$dst_height,$tmp_w,$tmp_h);
imagedestroy($tmp_img);
}elseif($ratio_w > 1 && $ratio_h > 1){
$dst_x = (int) abs($dst_width - $this->src_width) / 2 ; 
$dst_y = (int) abs($dst_height -$this->src_height) / 2;    
imagecopy($this->dImage, $this->sImage,$dst_x,$dst_y,0,0,$this->src_width,$this->src_height);
}else{
$src_x=0;$dst_x=0;$src_y=0;$dst_y=0;
if(($dst_width - $this->src_width) < 0){
$src_x = (int) ($this->src_width - $dst_width)/2;
$dst_x =0;
}else{
$src_x =0;
$dst_x = (int) ($dst_width - $this->src_width)/2;
}
 
if( ($dst_height -$this->src_height) < 0){
$src_y = (int) ($this->src_height - $dst_height)/2;
$dst_y = 0;
}else{
$src_y = 0;
$dst_y = (int) ($dst_height - $this->src_height)/2;
}
imagecopy($this->dImage, $this->sImage,$dst_x,$dst_y,$src_x,$src_y,$this->src_width,$this->src_height);
}
break;
case 3:        // keep all image size and create need size
if($ratio_w > 1 && $ratio_h > 1){
$dst_x = (int)(abs($dst_width - $this->src_width )/2) ; 
$dst_y = (int)(abs($dst_height- $this->src_height)/2) ;
imagecopy($this->dImage, $this->sImage, $dst_x,$dst_y,0,0,$this->src_width,$this->src_height);
}else{
$ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($this->src_width * $ratio);
$tmp_h = (int)($this->src_height * $ratio);
$tmp_img=imagecreatetruecolor($tmp_w ,$tmp_h);
imagecopyresampled($tmp_img,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);
$dst_x = (int)(abs($tmp_w -$dst_width )/2) ; 
$dst_y = (int)(abs($tmp_h -$dst_height)/2) ;
imagecopy($this->dImage, $tmp_img, $dst_x,$dst_y,0,0,$tmp_w,$tmp_h);
imagedestroy($tmp_img);
}
break;
case 4:        // keep all image but create actually size
if($ratio_w > 1 && $ratio_h > 1){
$this->dImage = imagecreatetruecolor($this->src_width,$this->src_height);
imagecopy($this->dImage, $this->sImage,0,0,0,0,$this->src_width,$this->src_height);
}else{
$ratio = $ratio_w > $ratio_h ? $ratio_h : $ratio_w;
$tmp_w = (int)($this->src_width * $ratio);
$tmp_h = (int)($this->src_height * $ratio);
$this->dImage = imagecreatetruecolor($tmp_w ,$tmp_h);
imagecopyresampled($this->dImage,$this->sImage,0,0,0,0,$tmp_w,$tmp_h,$this->src_width,$this->src_height);
}
break;
}
}// end Crop
 
 
}
?>

Related posts:

Leave a Reply

Your email address will not be published.