Image processing with the atkFileAttribute - Revision history

bahtiar: there wasn't only spam but the page was destructed too

2007-07-09T06:12:21Z

there wasn't only spam but the page was destructed too

← Older revision		Revision as of 06:12, 9 July 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			// By overriding this method, we can do processing on the uploaded image.
			// The path and filename of the image are passed as parameters.
			function processFile($path, $filename)
			{
			// Include the image class we downloaded. By using the 'moduleDir' method, we
			// ensure that our module works regardless of where it is installed.
			include_once(moduleDir("attriblib")."class.image.php");

			// Read the image as a PHP image resource, and convert it to sepia:
			$img = imagecreatefrompng($path.$filename);
			Image::sepia($img);

			// Now we create a thumbnail with a fixed size.
			$img2 = imagecreate(220,120);

			// We've made the image a bit larger than what we're going to use
			// for the thumbnail, so the remaining space will be used as
			// backgroundcolor. By allocating the color, we create the background.
			// Let's choose 'read' for our border.
			$background_color = imagecolorallocate($img2, 255, 0, 0);

			// To resize the image, we need to know its original size, for which we
			// can use the 'getimagesize' function from PHP.
			list($width, $height, $type, $attr) = getimagesize($path.$filename);

			// Now create the thumbnail.
			imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);

			// Make the thumbname file have the same name as the original, with prefix
			// "thumb_", and write it to the same directory as the original image.
			$thumb = "thumb_".$filename;
			imagepng($img2, $path.$thumb);
			}
			}
			</syntaxhighlight>

			You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

			Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			function processFile($path, $filename)
			{
			(...)
			}

			function display($record, $mode="")
			{
			// In recodlists, show the thumbnail instead of the larger image.
			if ($mode=="list")
			{
			// use the thumb_... version of the image
			return '<img src="'.$this->m_url.
			"thumb_".
			$record[$this->fieldName()]["orgfilename"].'">';
			}
			return parent::display($record, $mode);
			}
			}
			</syntaxhighlight>

			You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

			In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

			After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

Boy at 04:53, 9 July 2007

2007-07-09T04:53:04Z

← Older revision		Revision as of 04:53, 9 July 2007
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	== Intro ==		== Intro ==

Fk4Lj7 at 04:28, 7 July 2007

2007-07-07T04:28:53Z

Show changes

Leon: Fix destruction

2007-07-02T07:07:39Z

Fix destruction

← Older revision		Revision as of 07:07, 2 July 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			// By overriding this method, we can do processing on the uploaded image.
			// The path and filename of the image are passed as parameters.
			function processFile($path, $filename)
			{
			// Include the image class we downloaded. By using the 'moduleDir' method, we
			// ensure that our module works regardless of where it is installed.
			include_once(moduleDir("attriblib")."class.image.php");

			// Read the image as a PHP image resource, and convert it to sepia:
			$img = imagecreatefrompng($path.$filename);
			Image::sepia($img);

			// Now we create a thumbnail with a fixed size.
			$img2 = imagecreate(220,120);

			// We've made the image a bit larger than what we're going to use
			// for the thumbnail, so the remaining space will be used as
			// backgroundcolor. By allocating the color, we create the background.
			// Let's choose 'read' for our border.
			$background_color = imagecolorallocate($img2, 255, 0, 0);

			// To resize the image, we need to know its original size, for which we
			// can use the 'getimagesize' function from PHP.
			list($width, $height, $type, $attr) = getimagesize($path.$filename);

			// Now create the thumbnail.
			imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);

			// Make the thumbname file have the same name as the original, with prefix
			// "thumb_", and write it to the same directory as the original image.
			$thumb = "thumb_".$filename;
			imagepng($img2, $path.$thumb);
			}
			}
			</syntaxhighlight>

			You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

			Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			function processFile($path, $filename)
			{
			(...)
			}

			function display($record, $mode="")
			{
			// In recodlists, show the thumbnail instead of the larger image.
			if ($mode=="list")
			{
			// use the thumb_... version of the image
			return '<img src="'.$this->m_url.
			"thumb_".
			$record[$this->fieldName()]["orgfilename"].'">';
			}
			return parent::display($record, $mode);
			}
			}
			</syntaxhighlight>

			You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

			In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

			After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

Xv7Prz at 22:56, 1 July 2007

2007-07-01T22:56:26Z

← Older revision		Revision as of 22:56, 1 July 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view

	~~<syntaxhighlight lang="php">~~
	~~class sepiaAttribute extends atkFileAttribute~~
	{
	~~// By overriding this method, we can do processing on the uploaded image.~~
	~~// The path and filename of the image are passed as parameters.~~
	~~function processFile($path, $filename)~~
	{
	~~// Include the image class we downloaded. By using the 'moduleDir' method, we~~
	~~// ensure that our module works regardless of where it is installed.~~
	~~include_once(moduleDir("attriblib")."class.image.php");~~

	~~// Read the image as a PHP image resource, and convert it to sepia:~~
	~~$img = imagecreatefrompng($path.$filename);~~
	~~Image::sepia($img);~~

	~~// Now we create a thumbnail with a fixed size.~~
	~~$img2 = imagecreate(220,120);~~

	~~// We've made the image a bit larger than what we're going to use~~
	~~// for the thumbnail, so the remaining space will be used as~~
	~~// backgroundcolor. By allocating the color, we create the background.~~
	~~// Let's choose 'read' for our border.~~
	~~$background_color = imagecolorallocate($img2, 255, 0, 0);~~

	~~// To resize the image, we need to know its original size, for which we~~
	~~// can use the 'getimagesize' function from PHP.~~
	~~list($width, $height, $type, $attr) = getimagesize($path.$filename);~~

	~~// Now create the thumbnail.~~
	~~imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);~~

	~~// Make the thumbname file have the same name as the original, with prefix~~
	~~// "thumb_", and write it to the same directory as the original image.~~
	~~$thumb = "thumb_".$filename;~~
	~~imagepng($img2, $path.$thumb);~~
	}
	}
	~~</syntaxhighlight>~~

	You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

	Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

	~~<syntaxhighlight lang="php">~~
	~~class sepiaAttribute extends atkFileAttribute~~
	{
	~~function processFile($path, $filename)~~
	{
	~~(...)~~
	}

	~~function display($record, $mode="")~~
	{
	~~// In recodlists, show the thumbnail instead of the larger image.~~
	~~if ($mode=="list")~~
	{
	~~// use the thumb_... version of the image~~
	~~return '<img src="'.$this->m_url.~~
	~~"thumb_".~~
	~~$record[$this->fieldName()]["orgfilename"].'">';~~
	}
	~~return parent::display($record, $mode);~~
	}
	}
	~~</syntaxhighlight>~~

	You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

	In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

	After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

bahtiar: destruction

2007-06-10T19:54:50Z

destruction

← Older revision		Revision as of 19:54, 10 June 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			// By overriding this method, we can do processing on the uploaded image.
			// The path and filename of the image are passed as parameters.
			function processFile($path, $filename)
			{
			// Include the image class we downloaded. By using the 'moduleDir' method, we
			// ensure that our module works regardless of where it is installed.
			include_once(moduleDir("attriblib")."class.image.php");

			// Read the image as a PHP image resource, and convert it to sepia:
			$img = imagecreatefrompng($path.$filename);
			Image::sepia($img);

			// Now we create a thumbnail with a fixed size.
			$img2 = imagecreate(220,120);

			// We've made the image a bit larger than what we're going to use
			// for the thumbnail, so the remaining space will be used as
			// backgroundcolor. By allocating the color, we create the background.
			// Let's choose 'read' for our border.
			$background_color = imagecolorallocate($img2, 255, 0, 0);

			// To resize the image, we need to know its original size, for which we
			// can use the 'getimagesize' function from PHP.
			list($width, $height, $type, $attr) = getimagesize($path.$filename);

			// Now create the thumbnail.
			imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);

			// Make the thumbname file have the same name as the original, with prefix
			// "thumb_", and write it to the same directory as the original image.
			$thumb = "thumb_".$filename;
			imagepng($img2, $path.$thumb);
			}
			}
			</syntaxhighlight>

			You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

			Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			function processFile($path, $filename)
			{
			(...)
			}

			function display($record, $mode="")
			{
			// In recodlists, show the thumbnail instead of the larger image.
			if ($mode=="list")
			{
			// use the thumb_... version of the image
			return '<img src="'.$this->m_url.
			"thumb_".
			$record[$this->fieldName()]["orgfilename"].'">';
			}
			return parent::display($record, $mode);
			}
			}
			</syntaxhighlight>

			You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

			In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

			After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

CgiEyd at 04:52, 10 June 2007

2007-06-10T04:52:23Z

← Older revision		Revision as of 04:52, 10 June 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view

	~~<syntaxhighlight lang="php">~~
	~~class sepiaAttribute extends atkFileAttribute~~
	{
	~~// By overriding this method, we can do processing on the uploaded image.~~
	~~// The path and filename of the image are passed as parameters.~~
	~~function processFile($path, $filename)~~
	{
	~~// Include the image class we downloaded. By using the 'moduleDir' method, we~~
	~~// ensure that our module works regardless of where it is installed.~~
	~~include_once(moduleDir("attriblib")."class.image.php");~~

	~~// Read the image as a PHP image resource, and convert it to sepia:~~
	~~$img = imagecreatefrompng($path.$filename);~~
	~~Image::sepia($img);~~

	~~// Now we create a thumbnail with a fixed size.~~
	~~$img2 = imagecreate(220,120);~~

	~~// We've made the image a bit larger than what we're going to use~~
	~~// for the thumbnail, so the remaining space will be used as~~
	~~// backgroundcolor. By allocating the color, we create the background.~~
	~~// Let's choose 'read' for our border.~~
	~~$background_color = imagecolorallocate($img2, 255, 0, 0);~~

	~~// To resize the image, we need to know its original size, for which we~~
	~~// can use the 'getimagesize' function from PHP.~~
	~~list($width, $height, $type, $attr) = getimagesize($path.$filename);~~

	~~// Now create the thumbnail.~~
	~~imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);~~

	~~// Make the thumbname file have the same name as the original, with prefix~~
	~~// "thumb_", and write it to the same directory as the original image.~~
	~~$thumb = "thumb_".$filename;~~
	~~imagepng($img2, $path.$thumb);~~
	}
	}
	~~</syntaxhighlight>~~

	You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

	Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

	~~<syntaxhighlight lang="php">~~
	~~class sepiaAttribute extends atkFileAttribute~~
	{
	~~function processFile($path, $filename)~~
	{
	~~(...)~~
	}

	~~function display($record, $mode="")~~
	{
	~~// In recodlists, show the thumbnail instead of the larger image.~~
	~~if ($mode=="list")~~
	{
	~~// use the thumb_... version of the image~~
	~~return '<img src="'.$this->m_url.~~
	~~"thumb_".~~
	~~$record[$this->fieldName()]["orgfilename"].'">';~~
	}
	~~return parent::display($record, $mode);~~
	}
	}
	~~</syntaxhighlight>~~

	You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

	In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

	After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

bahtiar: destruction

2007-04-11T07:07:09Z

destruction

← Older revision		Revision as of 07:07, 11 April 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			// By overriding this method, we can do processing on the uploaded image.
			// The path and filename of the image are passed as parameters.
			function processFile($path, $filename)
			{
			// Include the image class we downloaded. By using the 'moduleDir' method, we
			// ensure that our module works regardless of where it is installed.
			include_once(moduleDir("attriblib")."class.image.php");

			// Read the image as a PHP image resource, and convert it to sepia:
			$img = imagecreatefrompng($path.$filename);
			Image::sepia($img);

			// Now we create a thumbnail with a fixed size.
			$img2 = imagecreate(220,120);

			// We've made the image a bit larger than what we're going to use
			// for the thumbnail, so the remaining space will be used as
			// backgroundcolor. By allocating the color, we create the background.
			// Let's choose 'read' for our border.
			$background_color = imagecolorallocate($img2, 255, 0, 0);

			// To resize the image, we need to know its original size, for which we
			// can use the 'getimagesize' function from PHP.
			list($width, $height, $type, $attr) = getimagesize($path.$filename);

			// Now create the thumbnail.
			imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);

			// Make the thumbname file have the same name as the original, with prefix
			// "thumb_", and write it to the same directory as the original image.
			$thumb = "thumb_".$filename;
			imagepng($img2, $path.$thumb);
			}
			}
			</syntaxhighlight>

			You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

			Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

			<syntaxhighlight lang="php">
			class sepiaAttribute extends atkFileAttribute
			{
			function processFile($path, $filename)
			{
			(...)
			}

			function display($record, $mode="")
			{
			// In recodlists, show the thumbnail instead of the larger image.
			if ($mode=="list")
			{
			// use the thumb_... version of the image
			return '<img src="'.$this->m_url.
			"thumb_".
			$record[$this->fieldName()]["orgfilename"].'">';
			}
			return parent::display($record, $mode);
			}
			}
			</syntaxhighlight>

			You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

			In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

			After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

BsiT6h at 06:54, 11 April 2007

2007-04-11T06:54:08Z

← Older revision		Revision as of 06:54, 11 April 2007
Line 72:		Line 72:
	The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.		The atkFileAttribute contains a method called 'processFile'. By default this method does not do anything, but it can be implemented in custom attributes to do the processing.

	To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view&id=16 (there's no reason to reinvent this wheel, right?). Let's download it and place it in the attriblib/ directory. According to the docs, all we need to do is call Image::sepia($img) and it converts the image to sepia. Below is the code that does all the image conversion. I'll let the comments speak for itself:		To make the image Sepia, I googled a bit and found a useful 'class.image.php' on http://php.amnuts.com/index.php?do=view

	~~<syntaxhighlight lang="php">~~
	~~class sepiaAttribute extends atkFileAttribute~~
	{
	~~// By overriding this method, we can do processing on the uploaded image.~~
	~~// The path and filename of the image are passed as parameters.~~
	~~function processFile($path, $filename)~~
	{
	~~// Include the image class we downloaded. By using the 'moduleDir' method, we~~
	~~// ensure that our module works regardless of where it is installed.~~
	~~include_once(moduleDir("attriblib")."class.image.php");~~

	~~// Read the image as a PHP image resource, and convert it to sepia:~~
	~~$img = imagecreatefrompng($path.$filename);~~
	~~Image::sepia($img);~~

	~~// Now we create a thumbnail with a fixed size.~~
	~~$img2 = imagecreate(220,120);~~

	~~// We've made the image a bit larger than what we're going to use~~
	~~// for the thumbnail, so the remaining space will be used as~~
	~~// backgroundcolor. By allocating the color, we create the background.~~
	~~// Let's choose 'read' for our border.~~
	~~$background_color = imagecolorallocate($img2, 255, 0, 0);~~

	~~// To resize the image, we need to know its original size, for which we~~
	~~// can use the 'getimagesize' function from PHP.~~
	~~list($width, $height, $type, $attr) = getimagesize($path.$filename);~~

	~~// Now create the thumbnail.~~
	~~imagecopyresized($img2, $img, 10, 10, 0, 0, 200, 100, $width, $height);~~

	~~// Make the thumbname file have the same name as the original, with prefix~~
	~~// "thumb_", and write it to the same directory as the original image.~~
	~~$thumb = "thumb_".$filename;~~
	~~imagepng($img2, $path.$thumb);~~
	}
	}
	~~</syntaxhighlight>~~

	You may notice that this attribute now only works with PNG files, because we used imagecreatefrompng and imagepng. This however is just for the sake of example. You could check the extension and make it work for other image formats easily.

	Now we have an attribute that generates a thumbnail with some effects. If you now give it a try you will notice that the thumbnail image is being generated when you upload a file; however, ATK still displays the larger original image. To remedy this, we have to tell the new attribute to use the thumbnail instead of the original image. This can be done by overriding the display() method in our custom attribute. Have a look at the following code sample (I left out the processFile method contents for brevity):

	~~<syntaxhighlight lang="php">~~
	~~class sepiaAttribute extends atkFileAttribute~~
	{
	~~function processFile($path, $filename)~~
	{
	~~(...)~~
	}

	~~function display($record, $mode="")~~
	{
	~~// In recodlists, show the thumbnail instead of the larger image.~~
	~~if ($mode=="list")~~
	{
	~~// use the thumb_... version of the image~~
	~~return '<img src="'.$this->m_url.~~
	~~"thumb_".~~
	~~$record[$this->fieldName()]["orgfilename"].'">';~~
	}
	~~return parent::display($record, $mode);~~
	}
	}
	~~</syntaxhighlight>~~

	You see it takes a little bit of knowledge about the original attribute. The m_url member variable contains the location of the uploaded file, and the 'orgfilename' part in the $record is the filename of the image that is used in the original display method. If you derive an attribute from another attribute, have a look at the original source to find out how the attribute works.

	In the above example, you see that we use the parent::display logic to handle the actual image display when not in list mode. This way, we don't have to reimplement this behaviour in our derived class.

	After adding this code, check the application in your browser. You'll now see that when you upload new images, the recordlist will show the manipulated thumbnail image. When you click on to the edit or view page of a record, you will see the larger original image.

bahtiar: /* Adding the attribute to the node */

2007-01-14T16:23:51Z

Adding the attribute to the node

← Older revision		Revision as of 16:23, 14 January 2007
Line 62:		Line 62:
	In your node, replace the atkFileAttribute with the sepiaAttribute like this:		In your node, replace the atkFileAttribute with the sepiaAttribute like this:

	<php		<syntaxhighlight lang="php">
	$this->add(new sepiaAttribute("picture", atkconfig("atkroot")."pictures/"))		$this->add(new sepiaAttribute("picture", atkconfig("atkroot")."pictures/"))
	</syntaxhighlight>		</syntaxhighlight>