Creating thumbnail from an uploaded image in Joomla 2.5 - php

Question

I'm really new to joomla, I don't have idea what should I do to make it done. I just have this kind of code in administrator table, it refers to uploading files.
//Support for file field: cover
if(isset($_FILES['jform']['name']['cover'])):
jimport('joomla.filesystem.file');
jimport('joomla.filesystem.file');
$file = $_FILES['jform'];
//Check if the server found any error.
$fileError = $file['error']['cover'];
$message = '';
if($fileError > 0 && $fileError != 4) {
switch ($fileError) :
case 1:
$message = JText::_( 'File size exceeds allowed by the server');
break;
case 2:
$message = JText::_( 'File size exceeds allowed by the html form');
break;
case 3:
$message = JText::_( 'Partial upload error');
break;
endswitch;
if($message != '') :
JError::raiseWarning(500,$message);
return false;
endif;
}
else if($fileError == 4){
if(isset($array['cover_hidden'])):;
$array['cover'] = $array['cover_hidden'];
endif;
}
else{
//Check for filesize
$fileSize = $file['size']['cover'];
if($fileSize > 10485760):
JError::raiseWarning(500, 'File bigger than 10MB' );
return false;
endif;
//Replace any special characters in the filename
$filename = explode('.',$file['name']['cover']);
$filename[0] = preg_replace("/[^A-Za-z0-9]/i", "-", $filename[0]);
//Add Timestamp MD5 to avoid overwriting
$filename = md5(time()) . '-' . implode('.',$filename);
$uploadPath = JPATH_ADMINISTRATOR.DIRECTORY_SEPARATOR.'components'.DIRECTORY_SEPARATOR.'com_comic'.DIRECTORY_SEPARATOR.'images'.DIRECTORY_SEPARATOR.$filename;
$fileTemp = $file['tmp_name']['cover'];
if(!JFile::exists($uploadPath)):
if (!JFile::upload($fileTemp, $uploadPath)):
JError::raiseWarning(500,'Error moving file');
return false;
endif;
endif;
$array['cover'] = $filename;
}
endif;
I could upload the file (in this case, an image) from the codes above, but what I'll do next is creating a thumbnail for the uploaded image. I searched for the php codes through the internet but it doesn't seem to work since I can't synchronize it into joomla codes. Umm.. I've made a folder named thumbnail in images folder. So what should I do next?
I'll be so happy and grateful if any of you could help me with this. Thanks.

Answer 1

Well i can share technique I'm using, i hope it will help:
In table's method check after the all validation is done (at the end of the method, just before returning true) i add the following code:
$input = JFactory::getApplication()->input;
$files = $input->files->get('jform');
if (!is_null($files) && isset($files['image']))
$this->image = $this->storeImage($files['image']);
The i create a new method called storeImage() :
protected $_thumb = array('max_w' => 200, 'max_h' => 200);
private function storeImage($file) {
jimport('joomla.filesystem.file');
$filename = JFile::makeSafe($file['name']);
$imageSrc = $file['tmp_name'];
$extension = strtolower(JFile::getExt($filename));
// You can add custom images path here
$imagesPath = JPATH_ROOT . '/media/';
if (in_array($extension, array('jpg', 'jpeg', 'png', 'gif'))) {
// Generate random filename
$noExt = rand(1000, 9999) . time() . rand(1000, 9999);
$newFilename = $noExt . '.' . $extension;
$imageDest = $imagesPath . $newFilename;
if (JFile::upload($imageSrc, $imageDest)) {
// Get image size
list($w, $h, $type) = GetImageSize($imageDest);
switch ($extension) {
case 'jpg':
case 'jpeg':
$srcRes = imagecreatefromjpeg($imageDest);
break;
case 'png':
$srcRes = imagecreatefrompng($imageDest);
break;
case 'gif':
$srcRes = imagecreatefromgif($imageDest);
break;
}
// Calculating thumb size
if($w > $h) {
$width_ratio = $this->_thumb['max_w'] / $w;
$new_width = $this->_thumb['max_w'];
$new_height = $h * $width_ratio;
} else {
$height_ratio = $this->_thumb['max_w'] / $h;
$new_width = $w * $height_ratio;
$new_height = $this->_thumb['max_w'];
}
$destRes = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($destRes, $srcRes, 0, 0, 0, 0, $new_width, $new_height, $w, $h);
// Creating resized thumbnail
switch ($extension) {
case 'jpg':
case 'jpeg':
imagejpeg($destRes, $imagesPath . 'thumb_' . $newFilename, 100);
break;
case 'png':
imagepng($destRes, $imagesPath . 'thumb_' . $newFilename, 1);
break;
case 'gif':
imagegif($destRes, $imagesPath . 'thumb_' . $newFilename, 100);
break;
}
imagedestroy($destRes);
// Delete old image if it was set before
if (($this->image != "") && JFile::exists($imagesPath . $this->image)) {
JFile::delete($imagesPath . $this->image);
JFile::delete($imagesPath . 'thumb_' . $this->image);
}
return $newFilename;
}
}
}
}
return null;
}
This method returns uploaded file filename, which table stores in 'image' column. It creates two files, one original image and resized thumb with file prefix '_thumb'.
I hope it helps :)

Answer 2

I used Jimage : https://api.joomla.org/cms-3/classes/JImage.html
$JImage = new JImage($img_path);
$size_thumb = '150x150';
$JImage->createThumbs($size_thumb,1,$path.'/thumb');
Short, simple and efficient.