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<?php
/**
* 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
}
?>
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