<?php

/*

*说明：函数功能是把一个图像裁剪为任意大小的图像，图像不变形

* 参数说明：输入 需要处理图片的 文件名，生成新图片的保存文件名，生成新图片的宽，生成新图片的高

* written by smallchicken

* time 2008-12-18

*/

// 获得任意大小图像，不足地方拉伸，不产生变形，不留下空白

function my_image_resize($src_file, $dst_file , $new_width , $new_height) {

if($new_width <1 || $new_height <1) {

echo "params width or height error !";

exit();

}

if(!file_exists($src_file)) {

echo $src_file . " is not exists !";

exit();

}

// 图像类型

$type=exif_imagetype($src_file);

$support_type=array(IMAGETYPE_JPEG , IMAGETYPE_PNG , IMAGETYPE_GIF);

if(!in_array($type, $support_type,true)) {

echo "this type of image does not support! only support jpg , gif or png";

exit();

}

//Load image

switch($type) {

case IMAGETYPE_JPEG :

$src_img=imagecreatefromjpeg($src_file);

break;

case IMAGETYPE_PNG :

$src_img=imagecreatefrompng($src_file);

break;

case IMAGETYPE_GIF :

$src_img=imagecreatefromgif($src_file);

break;

default:

echo "Load image error!";

exit();

}

$w=imagesx($src_img);

$h=imagesy($src_img);

$ratio_w=1.0 * $new_width / $w;

$ratio_h=1.0 * $new_height / $h;

$ratio=1.0;

// 生成的图像的高宽比原来的都小，或都大 ，原则是 取大比例放大，取大比例缩小（缩小的比例就比较小了）

if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)) {

if($ratio_w < $ratio_h) {

$ratio = $ratio_h ; // 情况一，宽度的比例比高度方向的小，按照高度的比例标准来裁剪或放大

}else {

$ratio = $ratio_w ;

}

// 定义一个中间的临时图像，该图像的宽高比 正好满足目标要求

$inter_w=(int)($new_width / $ratio);

$inter_h=(int) ($new_height / $ratio);

$inter_img=imagecreatetruecolor($inter_w , $inter_h);

imagecopy($inter_img, $src_img, 0,0,0,0,$inter_w,$inter_h);

// 生成一个以最大边长度为大小的是目标图像$ratio比例的临时图像

// 定义一个新的图像

$new_img=imagecreatetruecolor($new_width,$new_height);

imagecopyresampled($new_img,$inter_img,0,0,0,0,$new_width,$new_height,$inter_w,$inter_h);

switch($type) {

case IMAGETYPE_JPEG :

imagejpeg($new_img, $dst_file,100); // 存储图像

break;

case IMAGETYPE_PNG :

imagepng($new_img,$dst_file,100);

break;

case IMAGETYPE_GIF :

imagegif($new_img,$dst_file,100);

break;

default:

break;

}

} // end if 1

// 2 目标图像 的一个边大于原图，一个边小于原图 ，先放大平普图像，然后裁剪

// =if( ($ratio_w < 1 && $ratio_h > 1) || ($ratio_w >1 && $ratio_h <1) )

else{

$ratio=$ratio_h>$ratio_w? $ratio_h : $ratio_w; //取比例大的那个值

// 定义一个中间的大图像，该图像的高或宽和目标图像相等，然后对原图放大

$inter_w=(int)($w * $ratio);

$inter_h=(int) ($h * $ratio);

$inter_img=imagecreatetruecolor($inter_w , $inter_h);

//将原图缩放比例后裁剪

imagecopyresampled($inter_img,$src_img,0,0,0,0,$inter_w,$inter_h,$w,$h);

// 定义一个新的图像

$new_img=imagecreatetruecolor($new_width,$new_height);

imagecopy($new_img, $inter_img, 0,0,0,0,$new_width,$new_height);

switch($type) {

case IMAGETYPE_JPEG :

imagejpeg($new_img, $dst_file,100); // 存储图像

break;

case IMAGETYPE_PNG :

imagepng($new_img,$dst_file,100);

break;

case IMAGETYPE_GIF :

imagegif($new_img,$dst_file,100);

break;

default:

break;

}

}// if3

}// end function

?>

<?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="Sunset_small.png" border="0">