php 图片处理类 （积累）

<?php

/*

图片处理类：缩略，裁剪，圆角，倾斜

*/

class resizeimage

{

   //图片类型

   var $type;

   //实际宽度

   var $width;

   //实际高度

   var $height;

   //改变后的宽度

   var $resize_width;

   //改变后的高度

   var $resize_height;

   //是否裁图

   var $cut;

   //源图象

   var $srcimg;

   //目标图象地址

   var $dstimg;

   //圆角源

   var $corner;

   var $im;

function resizeimage($img, $corner, $wid, $hei,$c, $corner_radius, $angle)

   {

       $this->srcimg = $img;

    $this->corner = $corner;

       $this->resize_width = $wid;

       $this->resize_height = $hei;

       $this->cut = $c;

    $this->corner_radius = $corner_radius;

    $this->angle = $angle;

       //图片的类型

       $this->type = substr(strrchr($this->srcimg,"."),1);

       //初始化图象

       $this->initi_img();

       //目标图象地址

       $this -> dst_img();

       //--

       $this->width = imagesx($this->im);

       $this->height = imagesy($this->im);

       //生成图象

       $this->newimg();

       ImageDestroy ($this->im);

   }

   function newimg()

   {

       //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)=="1")

       //裁图

       {

           if($ratio>=$resize_ratio)

           //高度优先

           {

               $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);

               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);

      $tmp = $this->rounded_corner($newimg,$this->resize_width);

               imagepng ($tmp,$this->dstimg);

           }

           if($ratio<$resize_ratio)

           //宽度优先

           {

               $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);

               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));

      $tmp = $this->rounded_corner($newimg);

               imagepng ($tmp,$this->dstimg);

           }

       }

       else

       //不裁图

       {

           if($ratio>=$resize_ratio)

           {

               $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);

               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);

               ImageJpeg ($newimg,$this->dstimg);

           }

           if($ratio<$resize_ratio)

           {

               $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);

               imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);

               ImageJpeg ($newimg,$this->dstimg);

           }

       }

   }

   //初始化图象

   function initi_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);

       }

   }

   //处理圆角

   function rounded_corner($image,$size)

   {

   $this->angle = 0;

   $topleft = true;

   $bottomleft = true;

   $bottomright = true;

   $topright = true;

   $corner_source = imagecreatefrompng('rounded_corner.png');

   $corner_width = imagesx($corner_source); 

   $corner_height = imagesy($corner_source); 

   $corner_resized = ImageCreateTrueColor($this->corner_radius, $this->corner_radius);

   ImageCopyResampled($corner_resized, $corner_source, 0, 0, 0, 0, $this->corner_radius, $this->corner_radius, $corner_width, $corner_height);

   $corner_width = imagesx($corner_resized); 

   $corner_height = imagesy($corner_resized); 

   $white = ImageColorAllocate($image,255,255,255);

   $black = ImageColorAllocate($image,0,0,0);

   //顶部左圆角

   if ($topleft == true) {

    $dest_x = 0; 

    $dest_y = 0; 

    imagecolortransparent($corner_resized, $black); 

    imagecopymerge($image, $corner_resized, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100);

   }

   //下部左圆角

   if ($bottomleft == true) {

    $dest_x = 0; 

    $dest_y = $size - $corner_height; 

    $rotated = imagerotate($corner_resized, 90, 0);

    imagecolortransparent($rotated, $black); 

    imagecopymerge($image, $rotated, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100); 

   }

   //下部右圆角

   if ($bottomright == true) {

    $dest_x = $size - $corner_width; 

    $dest_y = $size - $corner_height; 

    $rotated = imagerotate($corner_resized, 180, 0);

    imagecolortransparent($rotated, $black); 

    imagecopymerge($image, $rotated, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100); 

   }

   //顶部右圆角

   if ($topright == true) {

    $dest_x = $size - $corner_width; 

    $dest_y = 0;

    $rotated = imagerotate($corner_resized, 270, 0);

    imagecolortransparent($rotated, $black); 

    imagecopymerge($image, $rotated, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100); 

   }

   $image = imagerotate($image, $this->angle, $white);

   return $image; 

   }

   //图象目标地址

   function dst_img()

   {

       $full_length = strlen($this->srcimg);

       $type_length = strlen($this->type);

       $name_length = $full_length-$type_length;

       $name         = substr($this->srcimg,0,$name_length-1);

       $this->dstimg = $name."_small.png";

   }

}

//resizeimage("图片地址", "处理后的宽度", "处理后的高度", "是否裁剪", "圆角度数", "倾斜度");

$img_file = 'Sunset.jpg';

$corner = 'rounded_corner.png';

$resizeimage = new resizeimage($img_file, $corner, "80", "80", "1", "6", "0");

?>

<img src="small.png" border="0">