* author: 十年后的卢哥哥(/lurenjiashuo/)
* date: .11.13
* base from: /code/snippet_5189_2491*/
classResizeImage {//图片类型
private $type;//实际宽度
private $width;//实际高度
private $height;//改变后的宽度
private $resize_width;//改变后的高度
private $resize_height;//是否裁图
private $cut;//源图象
private $srcimg;//目标图象地址
private $dstimg;//临时创建的图象
private $im;function __construct($imgPath, $width, $height, $isCut, $savePath) {$this->srcimg = $imgPath;$this->resize_width = $width;$this->resize_height = $height;$this->cut = $isCut;//图片的类型
$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));//初始化图象
$this->initi_img();//目标图象地址
$this -> dst_img($savePath);//--
$this->width = imagesx($this->im);$this->height = imagesy($this->im);//生成图象
$this->newimg();
ImageDestroy ($this->im);
}private functionnewimg() {//改变后的图象的比例
$resize_ratio = ($this->resize_width)/($this->resize_height);//实际图象的比例
$ratio = ($this->width)/($this->height);if($this->cut) {//裁图
$newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);if($this->type=="png") {
imagefill($newimg, 0, 0, imagecolorallocatealpha($newimg, 0, 0, 0, 127));
}if($ratio>=$resize_ratio) {//高度优先
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
}else{//宽度优先
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
}
}else{//不裁图
if($ratio>=$resize_ratio) {$newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);if($this->type=="png") {
imagefill($newimg, 0, 0, imagecolorallocatealpha($newimg, 0, 0, 0, 127));
}
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
}else{$newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);if($this->type=="png") {
imagefill($newimg, 0, 0, imagecolorallocatealpha($newimg, 0, 0, 0, 127));
}
imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
}
}if($this->type=="png") {
imagesavealpha($newimg, true);
imagepng ($newimg,$this->dstimg);
}else{
imagejpeg ($newimg,$this->dstimg);
}
}//初始化图象
private functioniniti_img() {if($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);
}
}//图象目标地址
private function dst_img($dstpath) {$full_length = strlen($this->srcimg);$type_length = strlen($this->type);$name_length = $full_length-$type_length;$name = substr($this->srcimg,0,$name_length-1);$this->dstimg = $dstpath;
}
}?>
