PHP 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 < $targ_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
即
$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
即
$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, $mphoto_save, 100);
break;
default:
break;
}
//echo "
//exit();
imagedestory($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?

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Alipay PHP...

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

Article discusses essential security features in frameworks to protect against vulnerabilities, including input validation, authentication, and regular updates.

The article discusses adding custom functionality to frameworks, focusing on understanding architecture, identifying extension points, and best practices for integration and debugging.

Sending JSON data using PHP's cURL library In PHP development, it is often necessary to interact with external APIs. One of the common ways is to use cURL library to send POST�...
