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HomeBackend DevelopmentPHP TutorialPHP 裁切问题,求大神指点指点,弄了一天了.

我前端用JCROP获取到x、y坐标、宽度、高度,传递到 uphoto.php处理,现在一切正常,但是如果前端用户选择的图片宽度过大(我用css样式控制用户选择的图片最大宽度为680px),裁切出来的就不正常了...我查阅了一些资料,说是需要按比例换算,但是是按什么比例换算啊,用户选择的图片的宽度(大于680px时)和680换算么?

这是 uphoto.php:

$x1 = $_POST["x1"];$x2 = $_POST["x2"];$y1 = $_POST["y1"];$y2 = $_POST["y2"];$targ_w = $_POST["w"];$targ_h = $_POST["h"];if ($_FILES["mfile"]["error"]){echo "error: " . $_FILES["file"]["error"];}if (!empty($_FILES["mfile"]["name"])){ //提取文件域内容名称,并判断$path = "/upload/user/photo/"; //上传路径//检查是否有该文件夹,如果没有就创建,并给予最高权限//if(!file_exists($path)){mkdir("$path", 0700);}//允许上传的文件格式$allow_type = array("image/gif","image/pjpeg","image/jpeg","image/png");//检查上传文件是否在允许上传的类型if(!in_array($_FILES["mfile"]["type"], $allow_type)){echo "error:格式有误,仅支持gif/jpg/png"; exit();}//检测图片大小if($_FILES["mfile"]["size"] > 5*1024*1024){echo "error:文件不得超过5M"; exit();}$filetype = $_FILES["mfile"]["type"];if($filetype == "image/jpeg"){$img_type = ".jpg";}if ($filetype == "image/jpg") {$img_type = ".jpg";}if ($filetype == "image/pjpeg") {$img_type = ".jpg";}if($filetype == "image/gif"){$img_type = ".gif";}if($filetype == "image/png"){$img_type = ".png";}if($_FILES["mfile"]["name"]){$randstr = random_str().date("YmdHis"); //获取时间并赋值给变量$saveto = $_SERVER['DOCUMENT_ROOT'].$path.$randstr.$img_type; //图片的完整路径$newimg = $randstr.$img_type; //图片名称$flag=1;}//END IFif ($flag){$result = move_uploaded_file($_FILES["mfile"]["tmp_name"], $saveto);}//特别注意这里传递给move_uploaded_file的第一个参数为上传到服务器上的临时文件$src_file = $saveto;}}$type = exif_imagetype($src_file);$support_type = array(IMAGETYPE_JPEG , IMAGETYPE_PNG , IMAGETYPE_GIF);if(!in_array($type, $support_type, true)){echo "error:当前图片格式非JPG/PNG/GIF";exit();}//Load imageswitch($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();}$dst_r = ImageCreateTrueColor($targ_w, $targ_h);list($width_orig, $height_orig) = getimagesize($src_file);//if ($width_orig > 680){//$new_width_orig = 680;//$new_height_orig = ($height_orig*680)/$width_orig;//}//else {//$new_width_orig = $targ_w;//$new_height_orig = $targ_h;//}//echo $new_width_orig."<br />";//echo $new_height_orig."<br />";//echo "x:".$x1."<br />";//echo "y:".$y1;//exit();imagecopyresampled($dst_r, $src_img, 0, 0, $x1, $y1, $targ_w, $targ_h, $targ_w, $targ_h);//imagecopyresampled($dst_r, $src_img, 0, 0, $x1, $y1, $targ_w, $targ_h, $targ_w, $targ_h);switch($type) {case IMAGETYPE_JPEG :header('Content-type: image/jpeg');imagejpeg($dst_r, null, 100);break;case IMAGETYPE_PNG :header('Content-type: image/png');imagepng($dst_r, null, 100);break;case IMAGETYPE_GIF :header('Content-type: image/gif');imagegif($dst_r, null, 100);break;default:break;}echo "<img  src='". $dst_r ."' / alt="PHP 裁切问题,求大神指点指点,弄了一天了." >";exit;


求大神指点指点


回复讨论(解决方案)

用css样式控制用户选择的图片最大宽度为680px
就表示用户看到的是经过动态缩放的副本
那么你在传递裁剪区域坐标的时候,还需传递图片的原始尺寸
换算一下就可以了
X= x/680*图片宽

用css样式控制用户选择的图片最大宽度为680px
就表示用户看到的是经过动态缩放的副本
那么你在传递裁剪区域坐标的时候,还需传递图片的原始尺寸
换算一下就可以了
X= x/680*图片宽



谢谢啊,按你那样换算了 还是不正常..

list($width_orig, $height_orig) = getimagesize($src_file);
if ($width_orig > 680){
$nx = $x1/680 * $width_orig;
}
else {
$nx = $x1;
}

imagecopyresampled($dst_r, $src_img, 0, 0, $nx, $y1, $targ_w, $targ_h, $targ_w, $targ_h);

你 y 方向没有计算

list($width_orig, $height_orig) = getimagesize($src_file);
if ($width_orig > 680){
$nx = $x1/680 * $width_orig;
$new_height = $height_orig*680/$width_orig;
$ny = $y1/$new_height * $height_orig;
}
else {
$nx = $x1;
$ny = $y1;
}
imagecopyresampled($dst_r, $src_img, 0, 0, $nx, $ny, $targ_w, $targ_h, $targ_w, $targ_h);

这样计算么,也还是不行..

 $targ_w, $targ_h 这两个是裁切的宽度和高度 会不会跟这两个有关呢?

可以参考一下我之前写的裁剪。因为你是要裁剪,所以宽和高有一个是和裁剪后的尺寸的宽和高一样,另一边会>=裁剪后的。
http://blog.csdn.net/fdipzone/article/details/9316385

    /** 获取目标图生成的size     * @return Array $width, $height     */      private function get_size(){          list($owidth, $oheight) = getimagesize($this->_source);          $width = (int)($this->_width);          $height = (int)($this->_height);                    switch($this->_type){              case 'fit':                  $pic_w = $width;                  $pic_h = (int)($pic_w*$oheight/$owidth);                  if($pic_h>$height){                      $pic_h = $height;                      $pic_w = (int)($pic_h*$owidth/$oheight);                  }                  break;              case 'crop':                  $pic_w = $width;                  $pic_h = (int)($pic_w*$oheight/$owidth);                  if($pic_h<$height){                      $pic_h = $height;                      $pic_w = (int)($pic_h*$owidth/$oheight);                  }                  break;          }            return array($pic_w, $pic_h);      } 

可以参考一下我之前写的裁剪。因为你是要裁剪,所以宽和高有一个是和裁剪后的尺寸的宽和高一样,另一边会>=裁剪后的。
http://blog.csdn.net/fdipzone/article/details/9316385

    /** 获取目标图生成的size     * @return Array $width, $height     */      private function get_size(){          list($owidth, $oheight) = getimagesize($this->_source);          $width = (int)($this->_width);          $height = (int)($this->_height);                    switch($this->_type){              case 'fit':                  $pic_w = $width;                  $pic_h = (int)($pic_w*$oheight/$owidth);                  if($pic_h>$height){                      $pic_h = $height;                      $pic_w = (int)($pic_h*$owidth/$oheight);                  }                  break;              case 'crop':                  $pic_w = $width;                  $pic_h = (int)($pic_w*$oheight/$owidth);                  if($pic_h<$height){                      $pic_h = $height;                      $pic_w = (int)($pic_h*$owidth/$oheight);                  }                  break;          }            return array($pic_w, $pic_h);      } 



谢谢啊 , 按你那样调整了,还是不正常的额:

list($width_orig, $height_orig) = getimagesize($src_file);
$pic_w = $targ_w;  
$pic_h = (int)($pic_w*$height_orig/$width_orig);  
if($pic_h  $pic_h = $targ_h;  
$pic_w = (int)($pic_h*$width_orig/$height_orig);  
}
imagecopyresampled($dst_r, $src_img, 0, 0, $x1, $y1, $targ_w, $targ_h, $pic_w, $pic_h);

我现在是想把宽度680的图片裁切成宽度680px,然后在裁切...

宽度大于680的图片裁切成宽度680px
由  图片宽 / 图片高 = 680 / h
得 h = 680 / 图片宽 * 图片高

$targ_h = 680 / $pic_w * $pic_h;
$targ_w = 680; 

宽度大于680的图片裁切成宽度680px
由  图片宽 / 图片高 = 680 / h
得 h = 680 / 图片宽 * 图片高

$targ_h = 680 / $pic_w * $pic_h;
$targ_w = 680; 



谢谢啊,我现在通过将用户选择的图片若超过680px就裁切成宽度680px(高度通过你那样的算法算的),然后再裁切成头像,测试是正常的,但还有几个细节我有点不明白,下面是源码:


$x1 = $_POST["x1"];$x2 = $_POST["x2"];$y1 = $_POST["y1"];$y2 = $_POST["y2"];$targ_w = $_POST["w"];$targ_h = $_POST["h"];if ($_FILES["mfile"]["error"]){echo "error: " . $_FILES["file"]["error"];}if (!empty($_FILES["mfile"]["name"])){ //提取文件域内容名称,并判断$path = "/upload/user/photo/"; //上传路径//检查是否有该文件夹,如果没有就创建,并给予最高权限//if(!file_exists($path)){mkdir("$path", 0700);}//允许上传的文件格式$allow_type = array("image/gif","image/pjpeg","image/jpeg","image/png");//检查上传文件是否在允许上传的类型if(!in_array($_FILES["mfile"]["type"], $allow_type)){echo "error:格式有误,仅支持gif/jpg/png"; exit();}//检测图片大小if($_FILES["mfile"]["size"] > 5*1024*1024){echo "error:文件不得超过5M"; exit();}$filetype = $_FILES["mfile"]["type"];if($filetype == "image/jpeg"){$img_type = ".jpg";}if ($filetype == "image/jpg") {$img_type = ".jpg";}if ($filetype == "image/pjpeg") {$img_type = ".jpg";}if($filetype == "image/gif"){$img_type = ".gif";}if($filetype == "image/png"){$img_type = ".png";}if($_FILES["mfile"]["name"]){$randstr = random_str().date("YmdHis"); //获取时间并赋值给变量$saveto = $_SERVER['DOCUMENT_ROOT'].$path.$randstr.$img_type; //图片的完整路径$newimg = $randstr.$img_type; //图片名称$flag=1;}//END IFif ($flag){$result = move_uploaded_file($_FILES["mfile"]["tmp_name"], $saveto);}//特别注意这里传递给move_uploaded_file的第一个参数为上传到服务器上的临时文件$src_file = $saveto;}}list($width_orig, $height_orig) = getimagesize($src_file);if ($width_orig > 680){$tmp_type = exif_imagetype($src_file);switch($tmp_type) {case IMAGETYPE_JPEG :$tmp_src_img = imagecreatefromjpeg($src_file);break;case IMAGETYPE_PNG :$tmp_src_img = imagecreatefrompng($src_file);break;case IMAGETYPE_GIF :$tmp_src_img = imagecreatefromgif($src_file);break;default:echo "Load image error!";exit();}$ntmp_width = 680;$ntmp_height = $height_orig*$ntmp_width/$width_orig;$ntmp_imgr = ImageCreateTrueColor($ntmp_width, $ntmp_height);imagecopyresampled($ntmp_imgr, $tmp_src_img, 0, 0, 0, 0, $ntmp_width, $ntmp_height, $width_orig, $height_orig);switch($tmp_type) {case IMAGETYPE_JPEG :header('Content-type: image/jpeg');imagejpeg($ntmp_imgr, $_SERVER['DOCUMENT_ROOT'].$path.$randstr.$img_type, 100);break;case IMAGETYPE_PNG :header('Content-type: image/png');imagepng($ntmp_imgr, $_SERVER['DOCUMENT_ROOT'].$path.$randstr.$img_type, 100);break;case IMAGETYPE_GIF :header('Content-type: image/gif');imagegif($ntmp_imgr, $_SERVER['DOCUMENT_ROOT'].$path.$randstr.$img_type, 100);break;default:break;}$src_file = $_SERVER['DOCUMENT_ROOT'].$path.$randstr.$img_type;}$type = exif_imagetype($src_file);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($src_file);break;default:echo "Load image error!";exit();}$dst_r = ImageCreateTrueColor($targ_w, $targ_h);imagecopyresampled($dst_r, $src_img, 0, 0, $x1, $y1, $targ_w, $targ_h, $targ_w, $targ_h);switch($type) {case IMAGETYPE_JPEG :header('Content-type: image/jpeg');imagejpeg($dst_r, null, 100);break;case IMAGETYPE_PNG :header('Content-type: image/png');imagepng($dst_r, null, 100);break;case IMAGETYPE_GIF :header('Content-type: image/gif');imagegif($dst_r, null, 100);break;default:break;}echo "<img  src='". $dst_r ."' / alt="PHP 裁切问题,求大神指点指点,弄了一天了." >";exit;


其中那个红色部分,我如果换成上传的图片的宽度和高度($width_orig,$height_orig),就会不正常...
按我现在这样的方式,有没办法优化下?
我看好多使用裁切之后 都会 imagedestory() 这个是删除图片流,而不是原图吧?

图片的宽、高 应通过 imagesx($src_img)、imagesy($src_img) 取得,传入的可能不正确
 imagedestory() 是释放资源,比如  imagedestory($src_img)
不写也可以,php 会替你释放的
 

图片的宽、高 应通过 imagesx($src_img)、imagesy($src_img) 取得,传入的可能不正确
 imagedestory() 是释放资源,比如  imagedestory($src_img)
不写也可以,php 会替你释放的
 



谢谢啊 我现在想把裁切好的图片保存到数据库中,却出现 图像 ... 因存在错误而无法显示。

这是代码:

$dst_r = ImageCreateTrueColor($targ_w, $targ_h);
imagecopyresampled($dst_r, $src_img, 0, 0, $x1, $y1, $targ_w, $targ_h, $targ_w, $targ_h);

$mphoto = $path.$uid.$randstr.$img_type;
$mphoto_save = $_SERVER['DOCUMENT_ROOT'].$mphoto;
//echo $mphoto_save;
//exit();
switch($type) {
case IMAGETYPE_JPEG :
header('Content-type: image/jpeg');
imagejpeg($dst_r, $mphoto_save, 100);
break;
case IMAGETYPE_PNG :
header('Content-type: image/png');
imagepng($dst_r, $mphoto_save, 100);
break;
case IMAGETYPE_GIF :
header('Content-type: image/gif');
imagegif($dst_r, $mphoto_save, 100);
break;
default:
break;
}

//echo "PHP 裁切问题,求大神指点指点,弄了一天了.";
//exit();

imagedestory($dst_r); 
imagedestory($src_img);



if (!mysqli_query($conn, "update dh_member set photo='". $mphoto ."' where id=". $uid ."")){die(mysqli_error($conn));}
echo "
<script>document.back_form.submit();</script>";
exit();

是怎么回事啊,我都没有输出图片啊..

假定 $dst_r 是 image 资源
imagegif($dst_r); 就是输出图片数据流
imagegif($dst_r, '图片文件名'); 就是保存到文件

数据库保存图片文件名即可
如果数据库要保存图片数据,则应用合适的 blob 类型字段 
数据从 图片文件 读取或拦截php的输出
用 bin2hex 函数转换成字符串,在前面加 ‘0x'

假定 $dst_r 是 image 资源
imagegif($dst_r); 就是输出图片数据流
imagegif($dst_r, '图片文件名'); 就是保存到文件

数据库保存图片文件名即可
如果数据库要保存图片数据,则应用合适的 blob 类型字段 
数据从 图片文件 读取或拦截php的输出
用 bin2hex 函数转换成字符串,在前面加 ‘0x'



谢谢啊,怎么做到让它不输出图片流呢(输出图片流为的就是保存成新文件名),直接保存到文件夹,然后更新数据库呢?
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