File Manipulation Code
  Home arrow File Manipulation Code arrow PHP Class: Image Snapshot 1.3
Codewalker Forums 
  Tutorials  
Database Articles  
Miscellaneous  
Navigation Usability  
PEAR Articles  
Programming Basics  
Server Administration  
XML Tutorials  
  Reviews  
Database Book Reviews  
Linux Book Reviews  
Miscellaneous Reviews  
PHP Book Reviews  
PHP Software Reviews  
Server Admin Reviews  
SQL Tool Reviews  
  Code Gallery  
Content Management Code  
Contest Code  
Counters Code  
Database Code  
Date Time Code  
Discussion Board Code  
Email Code  
File Manipulation Code  
GUI Code  
Link Farm Code  
Miscellaneous Code  
Search Code  
Site Navigation Code  
User Management Code  
Mobile Linux 
App Generation ROI 
IBM® developerWorks 
Download TestComplete 
Forums Sitemap 
Weekly Newsletter 
 
Developer Updates  
Free Website Content 
 RSS  Articles
 RSS  Forums
 RSS  All Feeds
Write For Us Get Paid 
Request Media Kit
Contact Us 
Site Map 
Privacy Policy 
Support 
 USERNAME
 
 PASSWORD
 
 
  >>> SIGN UP!  
  Lost Password? 
FILE MANIPULATION CODE

PHP Class: Image Snapshot 1.3
By: Codewalkers
  • Search For More Articles!
  • Disclaimer
  • Author Terms
  • Rating: 5 stars5 stars5 stars5 stars5 stars / 2
    2006-08-28

    Table of Contents:

    Rate this Article: Poor Best 
      ADD THIS ARTICLE TO:
      Del.ici.ous Digg
      Blink Simpy
      Google Spurl
      Y! MyWeb Furl
    Email Me Similar Content When Posted
    Add Developer Shed Article Feed To Your Site
    Email Article To Friend
    Print Version Of Article
    PDF Version Of Article
     
     
    ADVERTISEMENT


    Inspired by Backpackit.com’s image management, Image Snapshot can take a portion of an image (crop) to specific dimensions, from different areas of the original image.

    This class has been created for the purpose of manipulating an uploaded image, and creating a Thumbnail image that does not alter the aspect ratio, and yet represents the contents of the original image. I’m sure other uses can be found for the Image Snapshot class, but I’ll leave that to you. I use it for Photo Galleries, and Shopping Cart systems.

    This class supports:

    * Jpg, Gif, Png files
    * Output to Jpg
    * Can resize images before applying the crop
    * Can crop from any part of the image

    An online manual exists for more customizations: http://blog.jc21.com/files/snapshot_manual.pdf

    By : jc21com

    <?php
    /*
    IMAGE SNAPSHOT CLASS - www.jc21.com
    VERSION 1.3 ------------------------------------------------------

    Can accept JPG, GIF and PNG files.
    Refer to manual if you're confused:
    http://blog.jc21.com/files/snapshot_manual.pdf

    WARNING
    ------------------------------------------------------

    Will save all images as JPG.

    USAGE: ------------------------------------------------------

    include('snapshot.class.php'); //this file
    $myimage = new ImageSnapshot; //new instance
    //if using this as an action to a form:
    $myimage->ImageField = $_FILES['userfile']; //uploaded file array
    //OR if you have the contents of the image as a variable:
    $myimage->ImageContents = $the_image_contents; //image data
    //OR if you want to use an image that is already saved:
    $myimage->ImageFile = $_SERVER['DOCUMENT_ROOT'] . '/images/myimage.jpg'; //image file, as an example. Path can be relative or absolute.

    $myimage->Width = 100; //width of output image
    $myimage->Height = 100; //height of output image
    $myimage->Resize = true; //resize image before crop
    $myimage->ResizeScale = 50; //between 1 and 100, 0 for no resizing before crop, 100 to shrink image completely before crop
    $myimage->Position = 'center'; //can be 'center' (default), 'random', 'topleft', 'topcenter', 'topright', 'bottomleft', 'bottomcenter', 'bottomright','custom'
    $myimage->CustomPositionX = 25; //0 to 100. Only needed it Position is 'custom'. This specifies the position of the Snapshot along the X axis, in percentage. 25, is 25% from the left.
    $myimage->CustomPositiony = 35; //0 to 100. Only needed it Position is 'custom'. This specifies the position of the Snapshot along the Y axis, in percentage. 35, is 35% from the top.
    $myimage->Compression = 80; //jpg compression level

    //if you want to save as a file:
    if ($myimage->SaveImageAs('temp.jpg')) {
    echo '<img src="temp.jpg" border="0" width="' . $myimage->ReturnedWidth . '" height="' . $myimage->ReturnedHeight . '" alt="test" />';
    } else {
    echo $myimage->Err;
    }

    //OR if you want to get the contents into a variable:
    if ($myimage->ProcessImage() !== false) {
    $img = $myimage->GetImageContents();
    } else {
    echo $myimage->Err;
    }




    CHANGE LOG:
    ------------------------------------------------------
    05-12-2005 1.3 Release
    05-12-2005 Added: ImageFile field, can now load image from saved file.
    05-12-2005 Added: custom position type, specify by percentages. Read updated manual for help with this.
    28-11-2005 1.2 Release
    28-11-2005 Added: ReturnedWidth and ReturnedHeight variables, for more feedback.
    28-11-2005 Fixed: if crop area was bigger than original image, mixed results occured.
    28-11-2005 1.1 Release
    28-11-2005 Added: support for Image input with a variable
    27-11-2005 1.0 Release

    */




    class ImageSnapshot {

    var $ImageField; // should be: $_FILES['imagefield'] array, OR set the next var.
    var $ImageFile; // location of an image file saved on the server.
    var $ImageContents; // Contents of an image in a variable.
    var $Compression; // JPG compression. Default is 75%

    var $Resize; //either true or false. wether to resize image, if true the uses the next 3 vars
    var $ResizeScale; //scale to resize the image to. 100 is as small as possible, 0 is effectively no resizing at all.

    var $Position; //position of the snapshot: random, center (default), topleft, topright, bottomleft, bottomright

    var $Width; // width (or max width) of image to output
    var $Height; // height (or max height) of image to output

    var $Err; // error if (and when) they occur

    var $InternalImage; // Internal variable for working with the image

    var $ReturnedWidth; //New in 1.2: this is the actual width of the image returned, will only differ to Width if the original image was smaller.
    var $ReturnedHeight; //New in 1.2: this is the actual height of the image returned, will only differ to Height if the original image was smaller.

    var $CustomPositionX; //New in 1.3: 0 to 100, this is the percentage of the custom position along the X scale. $Position must be 'custom' for this to apply.
    var $CustomPositionY; //New in 1.3: 0 to 100, this is the percentage of the custom position along the Y scale. $Position must be 'custom' for this to apply.


    function ImageSnapshot() {
    //set up some defaults
    $this->Width = '800';
    $this->Height = '600';
    $this->Resize = true;
    $this->ResizeScale = 100;
    $this->Position = 'center';
    $this->Err = '';
    $this->Compression = 75;
    $this->InternalImage = '';
    $this->ImageContents = '';
    $this->ReturnedWidth = 0; // New in 1.2
    $this->ReturnedHeight = 0; // New in 1.2
    $this->CustomPositionX = 50; // New in 1.3
    $this->CustomPositionY = 50; // New in 1.3
    }



    function SaveImageAs($destination) {
    //Saves the image to the desination. Returns true if successful, or false with Err specifying the error.
    //example: $myimage->SaveImageAs("/docroot/images/newimage.jpg
    if ($this->ProcessImage()) {

    if (!$handle = fopen($destination, 'w')) {
    $this->Err = 'Cannot open file (' . $destination . ')';
    return false;
    } else {
    if (fwrite($handle, $this->InternalImage) === FALSE) {
    $this->Err = 'Cannot write to file (' . $destination . ')';
    return false;
    } else {
    return true;
    }
    fclose($handle);
    }
    } else {
    return false;
    }
    }

    function GetImageContents() {
    // If not already processed, calls process image, and returns the contents for other manipulations or database entry.
    if (strlen($this->InternalImage) == 0) {
    $this->ProcessImage();
    }
    //return the contents of the variable.
    return $this->InternalImage;
    }

    function ProcessImage() {
    //Processes the image. Resize if needed. fills the internal image with the contents of the changed image.
    //Internal function

    if (strlen($this->ImageContents) > 0) {
    //LOAD FROM STRING!
    $tmp_image = @imagecreatefromstring($this->ImageContents);
    //END LOAD FROM STRING

    } elseif (strlen($this->ImageFile) > 0) {
    //LOAD FROM FILE
    //check that file exists
    if (file_exists($this->ImageFile)) {
    //load it!
    $data = getimagesize($this->ImageFile); //[0] = w, [1] = h, [2] = type, [3] = attr
    switch ($data[2]) {
    case 1:
    $tmp_image = @imagecreatefromgif($this->ImageFile);
    break;
    case 2:
    $tmp_image = @imagecreatefromjpeg($this->ImageFile);
    break;
    case 3:
    $tmp_image = @imagecreatefrompng($this->ImageFile);
    break;
    default:
    $this->Err = 'File is not a valid image type';
    return false;
    exit;
    break;
    }
    } else {
    $this->Err = 'File "' . $this->ImageFile . '" does not exist!';
    return false;
    }
    //END LOAD FROM FILE

    } elseif (count($this->ImageField) > 0) {
    //LOAD FROM FIELD FILE
    //check that file exists
    if (file_exists($this->ImageField['tmp_name'])) {
    //load it!
    $data = getimagesize($this->ImageField['tmp_name']); //[0] = w, [1] = h, [2] = type, [3] = attr
    switch ($data[2]) {
    case 1:
    $tmp_image = @imagecreatefromgif($this->ImageField['tmp_name']);
    break;
    case 2:
    $tmp_image = @imagecreatefromjpeg($this->ImageField['tmp_name']);
    break;
    case 3:
    $tmp_image = @imagecreatefrompng($this->ImageField['tmp_name']);
    break;
    default:
    $this->Err = 'File is not a valid image type';
    return false;
    exit;
    break;
    }
    } else {
    $this->Err = 'File "' . $this->ImageField['tmp_name'] . '" does not exist!';
    return false;
    }
    //END LOAD FROM FILE

    } else {
    $this->Err = 'No image was loaded, use ImageFile, ImageContents or ImageField before output';
    return false;
    exit;
    }

    $image_width = imagesx($tmp_image);
    $image_height = imagesy($tmp_image);

    //check a div by zero error.
    if ($this->Resize == true && $this->ResizeScale == 0) {
    //there is no point resizing, when the scale doesn't change the size anyway.
    $this->Resize = false;
    }


    //check if image is meant to be resized...
    if ($this->Resize == 'true' || $this->Resize == 1) {
    //Yes resize
    if ($image_width > $this->Width && $image_height > $this->Height) {
    //have to resize..
    //get the proportional dimensions, while allowing room for a snapshot, and according to the resizescale
    $w_ratio = $this->Width / ($image_width * ($this->ResizeScale / 100)); //width ratio.. ie: 0.1 = 80 / 800
    $h_ratio = $this->Height / ($image_height * ($this->ResizeScale / 100)); //height ratio. ie: 0.075 = 60 / 800
    $maxwidth = $this->Width; //maxwidth is the max width of the final snapshot
    $maxheight = $this->Height; //maxheight is the max height of the final snapshot
    if ($w_ratio < $h_ratio) {
    $maxheight = ceil($image_height * $h_ratio);
    $maxwidth = ceil($image_width * $h_ratio);
    } else {
    $maxwidth = ceil($image_width * $w_ratio);
    $maxheight = ceil($image_height * $w_ratio);
    }

    //now we either have a correctly sized image (compared to the thumb) or an oversized image, that has been shrink and waiting to be snaopshot'd

    $final_width = $maxwidth;
    $final_height = $maxheight;
    //end maintain aspect

    imagecopyresampled($tmp_image, $tmp_image,0,0,0,0, $final_width, $final_height, $image_width, $image_height);

    $image_width = $final_width;
    $image_height = $final_height;

    }

    // end resize
    }

    //SNAPSHOT
    //at this stage, $tmp_image should contain the image ready for snapshot.

    if ($image_width < $this->Width) {
    $this->Width = $image_width;
    }
    if ($image_height < $this->Height) {
    $this->Height = $image_height;
    }

    //create canvas
    $new_photo = imagecreatetruecolor($this->Width,$this->Height);
    //set return values.
    $this->ReturnedWidth = $this->Width;
    $this->ReturnedHeight = $this->Height;

    $source_y = 0;
    $source_x = 0;

    //we shall compare the snapshot dimensions to the image dimensions

    switch ($this->Position) {
    case 'random':
    //my favourite, random place on the image.
    if ($image_height > $this->Height) {
    // height is larger.
    //get the min and max room to play with
    $min = 0;
    $max = $image_height - $this->Height;
    $source_y = rand($min,$max);
    }
    if ($image_width > $this->Width) {
    // width is larger.
    $min = 0;
    $max = $image_width - $this->Width;
    $source_x = rand($min,$max);
    }
    break;

    case 'topright':
    //topright of the image
    $source_y = 0;
    if ($image_width > $this->Width) {
    // width is larger.
    $source_x = $image_width - $this->Width;
    }
    break;

    case 'topleft':
    //topleft of the image
    $source_y = 0;
    $source_x = 0;
    break;

    case 'topcenter':
    //topleft of the image
    $source_y = 0;
    if ($image_width > $this->Width) {
    // width is larger.
    $source_x = (($image_width - $this->Width) / 2);
    }
    break;

    case 'bottomright':
    //bottomright of the image
    if ($image_height > $this->Height) {
    // height is larger.
    $source_y = $image_height - $this->Height;
    }
    if ($image_width > $this->Width) {
    // width is larger.
    $source_x = $image_width - $this->Width;
    }
    break;

    case 'bottomleft':
    //bottom left of the image
    if ($image_height > $this->Height) {
    // height is larger.
    $source_y = $image_height - $this->Height;
    }
    $source_x = 0;
    break;

    case 'bottomcenter':
    //bottom left of the image
    if ($image_height > $this->Height) {
    // height is larger.
    $source_y = $image_height - $this->Height;
    }
    if ($image_width > $this->Width) {
    // width is larger.
    $source_x = (($image_width - $this->Width) / 2);
    }
    break;

    case 'custom':
    //new in 1.3
    //use custom positions as percentages to get the position.
    if (round($this->CustomPositionX) < 0 || round($this->CustomPositionX) > 100) {
    //x not a valid number. Reset:
    $this->CustomPositionX = 50;
    }
    if (round($this->CustomPositionY) < 0 || round($this->CustomPositionY) > 100) {
    //y not a valid number. Reset:
    $this->CustomPositionY = 50;
    }

    //get the digits!
    if (round($this->CustomPositionY) == 0 || $image_height <= $this->Height) {
    //does not meet credentials
    $source_y = 0;
    } else {
    //ok
    $source_y = (($image_height - $this->Height) * (round($this->CustomPositionY) / 100)) ;
    }
    if (round($this->CustomPositionX) == 0 || $image_width <= $this->Width) {
    //does not meet credentials
    $source_x = 0;
    } else {
    //ok
    $source_x = (($image_width - $this->Width) * (round($this->CustomPositionX) / 100)) ;
    }
    break;

    default:
    //center of the image
    if ($image_height > $this->Height) {
    // height is larger.
    $source_y = (($image_height - $this->Height) / 2);
    }
    if ($image_width > $this->Width) {
    // width is larger.
    $source_x = (($image_width - $this->Width) / 2);
    }
    break;
    }

    //copy specific portions of the image
    imagecopyresampled($new_photo, $tmp_image,0,0,$source_x,$source_y, $this->Width, $this->Height, $this->Width, $this->Height);
    ob_start();
    imagejpeg($new_photo,null,$this->Compression);
    $this->InternalImage = ob_get_contents();
    ob_end_clean();
    return true;
    //END SNAPSHOT

    }
    }
    ?>
    DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.

    More File Manipulation Code Articles
    More By Codewalkers

     

    IBM® developerWorks developerWorks - FREE Tools!


    NEW! "ebook: Exploring IBM SOA Technology & Practice

    Learn field-tested SOA principles, methodology, technology and implementation from the global SOA market leader - in a new e-book by an IBM SOA expert. Written by IBM Certified SOA Solution Designer Bobby Woolf, "Exploring IBM SOA Technology & Practice" is the ultimate insider's guide to SOA - a PDF e-book packed cover to cover with IBM's specific advice on how to make your SOA implementation a success.
    FREE! Go There Now!


    NEW! A Layered approach to delivering security-rich Web applications

    As businesses grow increasingly dependent upon Web applications to provide services to customers, employees and partners, these complex applications become more difficult to secure. Although traditional security solutions protect Internet infrastructure layers, they do not guard against HTTP and HTML attacks. Many organizations that conduct security testing still deploy applications that allow attackers to manipulate their logic and wreak havoc on their business. To mitigate this risk, development and delivery teams must address Web application security throughout the lifecycle, addressing the many layers detailed in this paper.
    FREE! Go There Now!


    NEW! Best Practices in Integrated Requirements Management

    Poor Requirements Management capabilities in an Enterprise have been linked to excessive project failures, escalating IT costs, and failure to deliver competitive advantage into the marketplace. Join Brianna M Smith from IBM Rational and learn about how successful organizations align IT and Business stakeholders through collaborative processes and tools for effective requirements management, and how an integrated approach across the IT lifecycle can provide unparalleled visibility and traceability to ensure that project teams are delivering on the business vision by "doing the right things" and "doing things right."
    FREE! Go There Now!


    NEW! Develop Systems Software Assets with IBM Rational Asset Manager

    Join us for this on demand webcast to learn about developing complex systems more quickly and efficiently. We'll cover market drivers for developing, governing and reusing systems software assets and how you can develop system software assets with Rational Asset Manager.
    FREE! Go There Now!


    NEW! Hello World: WebSphere Service Registry and Repository

    Manage, govern, and share services across your organization by using WebSphere Service Registry and Repository. Follow the hands-on exercises to learn how to navigate the Web interface to publish, find, reuse, and update services.
    FREE! Go There Now!


    NEW! Successful Change and Release Management for .NET

    Join this webcast to discover the key requirements for successful change and release management. Learn how to extend your .NET environment to improve productivity and collaboration, and address core problems afflicting team development. In this webcast, we’ll review typical challenges faced by customers and how to resolve them with the IBM Rational Change and Release Management solution, including Rational ClearCase, Rational ClearQuest and Rational Build Forge. Replay is available for 9 months.
    FREE! Go There Now!


    NEW! Try the IBM SOA Sandbox for People

    Visit IBM developerWorks to try the IBM SOA Sandbox for people. The SOA Sandbox for people provides a trial environment with the necessary tooling and components required to enable consistent human and process interaction and collaboration, showing how you can improve user experience and business productivity.
    FREE! Go There Now!


    NEW! Webcast: Eclipse: Empowering the universal platform

    The Eclipse community is constantly working to extend Eclipse's functionality. In this webcast, learn about some of the most important and feature-rich projects under development. From multi-language support to plug-in development, tune in to see what Eclipse is capable of now.
    FREE! Go There Now!


    NEW! Webcast: IBM Rational Build Forge - Beyond the Build

    The discipline of assembling and delivering software is maturing beyond standard developer-centric compile/test software builds. The end-to-end software development lifecycle is emerging as the new focus moves “Beyond the Build.” Join this on demand webcast to learn about methods for streamlining software delivery and key capabilities of the IBM Rational Build Forge framework for automating build and release management in environments of any size.
    FREE! Go There Now!


    NEW! Whitepaper: Achieving consistency between business process models and operational guides

    Explore how Rational and WebSphere software enable enterprise documentation in SOA environments. Specifically, a new integration between IBM WebSphere® Business Modeler and IBM Rational® Method Composer software can help technical writers more easily keep enterprise operations manuals in sync with changes that are made to business processes, resulting in more accurate and timely documentation that benefits the entire enterprise.
    FREE! Go There Now!



    All FREE IBM® developerWorks Tools!

    FILE MANIPULATION CODE ARTICLES

    - Bandwidth Control with pure PHP
    - Eazy Gallery
    - file_get_contents for PHP < 4.3.0
    - PHP Class: Image Snapshot 1.3
    - Universal downloader
    - Image Gallery v2.0
    - Free/Used Disk Space
    - Directory Lister
    - Directory image view, with selective hidden
    - Move or Copy a Directory (and files and sub ...
    - Ensure_Sub_Directory_Exists
    - Wedit
    - Form Examples Text Boxes to Drop Downs
    - myFiles
    - List files in a directory, no subdirectories





    © 2003-2009 by Developer Shed. All rights reserved. DS Cluster 3 Hosted by Hostway
    For more Enterprise Application Development news, visit eWeek