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php 裁剪图片类

wyy 2022年03月15日 编程设计 169 0
<?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 
?>

第二个方法:

<?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">

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