/**

* Author : smallchicken

* Time : 2009年6月8日16:46:05

* Last Time: 2010年5月5日 10:24:30

* 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，此时的参数只是限制了生成的图片的最大宽高，不产生补白

* mode 5 : 生成的图比例严格按照需要的比例，宽和高不超过给定的参数。

* 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();

*

*

*/

function make_thumb($src,$dst,$width,$height,$mode)

{

$ic=new ImageCrop($src, $dst);

$ic->Crop($width , $height , $mode);

$ic->SaveImage();

$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;

if(!$dst_file) $this->dst_file = $this->src_file ;

}

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);

if(!$this->src_width || !$this->src_height || !$this->src_type){

return false;

}

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:

break;

}

return $this->sImage && is_resource($this->sImage) ? true : false ;

}

function SaveImage($fileName='') {

$this->dst_file=$fileName ? $fileName : $this->dst_file;

if($this->dImage && is_resource($this->dImage)){

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() {

if($this->dImage && is_resource($this->dImage)){

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';

if($this->dImage && is_resource($this->dImage)){

@imagesavealpha($this->dImage, true);

@imagepng($this->dImage,$this->dst_file);

}

}

function OutAlpha() {

if($this->dImage && is_resource($this->dImage)){

@imagesavealpha($this->dImage, true);

header('Content-type: image/png');

@imagepng($this->dImage);

}

}

function destory() {

if($this->sImage && is_resource($this->sImage)) @imagedestroy($this->sImage);

if($this->dImage && is_resource($this->dImage)) @imagedestroy($this->dImage);

}

/**

* 创建Image资源

*/

function &createImage($width,$height){

$im = @imagecreatetruecolor($width,$height);

if(!$im || !is_resource($im)) return false;

$bg = @imagecolorallocatealpha($im,255,255,255,127);

@imagefill($im, 0, 0, $bg);

@imagecolortransparent($im,$bg);

return $im;

}

function Crop($dst_width,$dst_height,$mode=1,$dst_file='') {

// 判断是否需要裁减：

if($dst_width<1 || $dst_height < 1) return false;

list($this->src_width, $this->src_height, $this->src_type) = getimagesize($this->src_file);

if($this->src_width==$dst_width && $this->src_height==$dst_height){

if($this->src_file==$this->dst_file) {

return true;

}else{ // 复制一份文件：

return @copy($this->src_file, $this->dst_file) ;

}

}

$this->LoadImage();

if($dst_file) $this->dst_file=$dst_file;

$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

$this->dImage = $this->createImage($dst_width,$dst_height) ;

if(!$this->dImage) { return false ;} // failed

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);

$src_x = abs(($this->src_width-$tmp_w)/2) ;

$src_y = abs(($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);

$src_x = abs($tmp_w - $dst_width) / 2 ;

$src_y = abs($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

$this->dImage = $this->createImage($dst_width,$dst_height) ;

if(!$this->dImage) { return false ;} // failed

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

$this->dImage = $this->createImage($dst_width,$dst_height) ;

if(!$this->dImage) { return false ;} // failed

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 = $this->sImage; // do nothing!

}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;

case 5: // if dst > src , crop , if (dst < src) crop fixed ratio

$ratio = $ratio_w < $ratio_h ? $ratio_h : $ratio_w;

$tmp_w = (int)($dst_width / $ratio);

$tmp_h = (int)($dst_height / $ratio);

$src_x = floor(abs(($this->src_width-$tmp_w)/2)) ;

$src_y = floor(abs(($this->src_height-$tmp_h)/2)) ;

if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)) {

if($ratio_w < 1 && $ratio_h < 1){

$tmp_img=imagecreatetruecolor($tmp_w , $tmp_h);

$this->dImage = imagecreatetruecolor($dst_width ,$dst_height);

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){

$this->dImage = @imagecreatetruecolor($tmp_w ,$tmp_h);

@imagecopy($this->dImage, $this->sImage, 0,0,$src_x,$src_y,$tmp_w,$tmp_h);

}

}else {

$this->dImage = @imagecreatetruecolor($tmp_w ,$tmp_h);

@imagecopy($this->dImage, $this->sImage,0,0,$src_x,$src_y,$this->src_width,$this->src_height);

}

break;

}

return $this->dImage && is_resource($this->dImage) ;

}// end Crop

}

?>