php常用图片处理类，_PHP教程

php常用图片处理类，

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); 
} 
} 
?>