自己写的一个图片处理类，和网上的存在的不同，该类只有一个公共方法，通过在实例化对象的时候给$type参数传不同的值，从而实现不同功能。 目前只实现了三个功能：1：图片缩放，2：图片裁剪，3：加图片水印
outimage(); ?>
types=$types;
$this->image=$this->imagesources($imageaddress);
$this->width=$this->imagesizex();
$this->height=$this->imagesizey();
$this->value1=$value1;
$this->value2=$value2;
$this->endaddress=$endaddress;
}function outimage(){//根据传入type值的不同，输出不同的功能
switch($this->types){
case 1:
$this->scaling();
break;
case 2:
$this->clipping();
break;
case 3:
$this->imagewater();
break;
default:
return false;
}
}
private function imagewater(){//加图片水印功能
//用函数获取水印文件的长和宽
$imagearrs=$this->getimagearr($this->value1);
//调用函数计算出水印加载的位置
$positionarr=$this->position($this->value2, $imagearrs[0], $imagearrs[1]);
//加水印
imagecopy($this->image, $this->imagesources($this->value1), $positionarr[0], $positionarr[1], 0, 0, $imagearrs[0], $imagearrs[1]);
//调用输出方法保存
$this->output($this->image);
}
private function clipping(){//图片裁剪功能
//将传进来的值分别赋给变量
list($src_x, $src_y)=explode(",", $this->value1);
list($dst_w, $dst_h)=explode(",", $this->value2);
if($this->width < $src_x+$dst_w || $this->height < $src_y+$dst_h){//这个判断就是限制不能截取到图片外面去
return false;
}
//创建新的画布资源
$newimg=imagecreatetruecolor($dst_w, $dst_h);
//进行裁剪
imagecopyresampled($newimg, $this->image, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $dst_w, $dst_h);
//调用输出方法保存
$this->output($newimg);
}
private function scaling(){//图片缩放功能
//获取等比缩放的宽和高
$this-> proimagesize();
//根据参数进行缩放,并调用输出函数保存处理后的文件
$this->output($this->imagescaling());
}
private function imagesources($imgad){//获取图片类型并打开图像资源
$imagearray=$this->getimagearr($imgad);
switch($imagearray[2]){
case 1://gif
$this->imgtype=1;
$img=imagecreatefromgif($imgad);
break;
case 2://jpeg
$this->imgtype=2;
$img=imagecreatefromjpeg($imgad);
break;
case 3://png
$this->imgtype=3;
$img=imagecreatefrompng($imgad);
break;
default:
return false;
}
return $img;
}
private function imagesizex(){//获得图片宽度
return imagesx($this->image);
}
private function imagesizey(){//获取图片高度
return imagesy($this->image);
}
private function proimagesize(){//计算等比缩放的图片的宽和高
if($this->value1 && ($this->width < $this->height)) {//等比缩放算法
$this->value1=round(($this->value2/ $this->height)*$this->width);
}else{
$this->value2=round(($this->value1/ $this->width) * $this->height);
}
}
private function imagescaling(){//图像缩放功能，返回处理后的图像资源
$newimg=imagecreatetruecolor($this->value1, $this->value2);
$tran=imagecolortransparent($this->image);//处理透明算法
if($tran >= 0 && $tran < imagecolorstotal($this->image)){
$tranarr=imagecolorsforindex($this->image, $tran);
$newcolor=imagecolorallocate($newimg, $tranarr['red'], $tranarr['green'], $tranarr['blue']);
imagefill($newimg, 0, 0, $newcolor);
imagecolortransparent($newimg, $newcolor);
}
imagecopyresampled($newimg, $this->image, 0, 0, 0, 0, $this->value1, $this->value2, $this->width, $this->height);
return $newimg;
}
private function output($image){//输出图像
switch($this->imgtype){
case 1:
imagegif($image, $this->endaddress);
break;
case 2:
imagejpeg($image, $this->endaddress);
break;
case 3:
imagepng($image, $this->endaddress);
break;
default:
return false;
}
}
private function getimagearr($imagesou){//返回图像属性数组方法
return getimagesize($imagesou);
}
private function position($num, $width, $height){//根据传入的数字返回一个位置的坐标,$width和$height分别代表插入图像的宽和高
switch($num){
case 1:
$positionarr[0]=0;
$positionarr[1]=0;
break;
case 2:
$positionarr[0]=($this->width-$width)/2;
$positionarr[1]=0;
break;
case 3:
$positionarr[0]=$this->width-$width;
$positionarr[1]=0;
break;
case 4:
$positionarr[0]=0;
$positionarr[1]=($this->height-$height)/2;
break;
case 5:
$positionarr[0]=($this->width-$width)/2;
$positionarr[1]=($this->height-$height)/2;
break;
case 6:
$positionarr[0]=$this->width-$width;
$positionarr[1]=($this->height-$height)/2;
break;
case 7:
$positionarr[0]=0;
$positionarr[1]=$this->height-$height;
break;
case 8:
$positionarr[0]=($this->width-$width)/2;
$positionarr[1]=$this->height-$height;
break;
case 9:
$positionarr[0]=$this->width-$width;
$positionarr[1]=$this->height-$height;
break;
case 0:
$positionarr[0]=rand(0, $this->width-$width);
$positionarr[1]=rand(0, $this->height-$height);
break;
}
return $positionarr;
}
function __destruct(){
imagedestroy($this->image);
}}
?> 
