php常用图片处理类，_PHP教程

php常用图片处理类，

输出后的地址+文件名 
function __construct($imageaddress, $types, $value1="", $value2="", $endaddress){ 
$this->types=$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(){ //http://www.hzhuti.com 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); } } ?>

　　

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