ImagePlugin < TWiki

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---+!! <nop>%TOPIC%
<!--
   Contributions to this plugin are appreciated. Please update the plugin page at
   http://twiki.org/cgi-bin/view/Plugins/ImagePlugin or provide feedback at
   http://twiki.org/cgi-bin/view/Plugins/ImagePluginDev.
   If you are a TWiki contributor please update the plugin in the SVN repository.
-->
%SHORTDESCRIPTION%
<div style="float:right; background-color:#eeeeee; margin:0 0 20px 20px; padding: 0 10px 0 10px; width:380px">
%TOC{title="Page contents"}%
</div>

---++ Introduction

Use this plugin to control the display and alignment of images using an easy syntax and support for server-side resizing and thumbnailing. There are a set of pre-defined layout formats for images as well as a free layout configurability.

Short example: %BR%
*You type:* %BR%
<verbatim>
%IMAGE{"WestminstpalaceSample.png"
  type="frame" 
  align="none" 
  caption="caption text"
}%
</verbatim>

*You get*: %BR%

<img src="%ATTACHURLPATH%/WestminstpalaceSample.png" alt="WestminstpalaceSample.png" width='416' height='339' />

Images to be displayed can be located
   * at the =topic= as specified,
   * at the location specified in the IMAGEALBUM preference variable,
   * at the current topic or
   * at a remote URL.

If you specify a remote url using =http://...= the image is downloaded (using CPAN:LWP::Simple)
into a local cache and then processed as usual. WARNING: please be aware of any copyrights of
the images you mirror this way.

The =topic= and IMAGEALBUM parameters can be of the for =[&lt;web>.]&lt;topic>=. For example putting
<verbatim>
   * Set IMAGEALBUM = TWiki.ImagePlugin
</verbatim>
into the current topic will search all images at the given topic.

---++ Syntax 

=%<nop>IMAGE{"foo.gif" ...}%=

There are four predefined format types (plain, simple, link, thumbnail, frame, float) that can be used by setting the =type= paramenter (see below).  In addition there is a free-form =format= parameter to specify any other possible html layout.  The Wikipedia format is also supported. See Wikipedia:Wikipedia:Extended_image_syntax.

(hidden feature: =%<nop>IMAGE{"clear"}%= will create a proper clear for your floats ;)  )

---+++ Arguments

The image name is mandatory.  Further arguments are optional.

| *Name* |  *Values*  |  *Default*  |
| =align=  | left&#124;center&#124;right&#124;none  | right |
| =alt= | alt text | image filename |
| =caption=  | caption text  | empty  |
| =class= | (see html specs) | imageFrame, imageFloat, ... depending on the type |
| =desc= | description text | title text |
| =footer= | text to be appended to the html output | empty |
| =format= | image layout format string | set by type argument |
| =header= | text to be prepended to the html output | empty |
| =height= | integer value | image width |
| =href= | hyperlink when clicking on the image | url of the source image |
| =id= | (see html specs) | empty |
| =mousein= | javascript executed if moving the mouse over the image | empty |
| =mouseout= | javascript executed if moving the mouse off the image | empty |
| =size=  | geometry specification | image geometry  |
| =style= | (see html specs) | empty |
| =title= | title text | *alt* value |
| =topic= | valid TWiki topic name | topic part of IMGALBUM value or current topic |
| =type=  |  simple&#124;link&#124;thumb[nail]&#124;frame&#124;float"  | plain  |
| =web= | valid TWiki web name | web part of IMGALBUM value or current topic |
| =width= | integer value | image width |
| =warn= | on/off, surpress error warnings | on |

---+++ Image geometry

The image geometry in the =size= parameter can be specified in a format =&lt;width>[px][x&lt;height>[px]]=, that is width and height can be given as integers with an optional =px=, where the height is optional, separated with a 'x' in between. Note, that the given width and height values are the _maximum width_ and _maximum height_ that the image will have keeping its aspect ratio. If you want to deform it to an extact measure use the =width= and =height= arguments.

---+++ Format specification

Format strings given in =header=, =footer= and =format= may contain the following pseudo variables:

| *Name* | *Value* |
| =$align= | value of =align= argumet |
| =$alt= | value of =alt= argumet |
| =$caption= | caption text |
| =$class= | value of =class= argumet |
| =$desc= | value of =desc= argument |
| =$dollar= | replaced with dollar sign ($) |
| =$height= | image height |
| =$href= | hyperlink url when clicking on an image |
| =$id= | value of =id= argumet |
| =$magnifyIcon= | enlage-icon |
| =$mousein= | value of =mousein= argument |
| =$mouseout= | value of =mouseout= argument |
| =$n= | replaced with a linefeed (\n) |
| =$nop= | replaced with empty string |
| =$origheight= | image height of the original image|
| =$origsrc= | url of the original image (not the resized one) |
| =$origwidth= | image width of the original image |
| =$percnt= | replaced with percent sign (%) |
| =$src= | image source url |
| =$style= | value of =style= argumet |
| =$text= | link text to be displayed in the "link" layout type |
| =$title= | value of =title= argument |
| =$width= | image width |

After the layout has been formatted any further TWiki markup that might be contained is expanded afterwards. Note, that using =$percnt= and =$dollar= evaluation order of TWiki markup can be changed so that arguments are expanded _after_ the IMAGE tag has been computed, whereas TWiki's default evaluation order is left-to-right-inside-out.
   
---++ Examples

   * =%<nop>IMAGE{"foo.gif" size="100" align="left" caption="This is my caption"}%=  (resize to 100 pixels, text flows right, with caption)
   * =%<nop>IMAGE{"foo.gif" type="thumb" align="center"}%=  (Resize to %<nop>THUMBNAIL_SIZE% size, and center image)

---++ Plugin Installation Instructions

   * Download the ZIP file
   * Unzip ==%TOPIC%.zip== in your twiki installation directory. Content:
     | *File:* | *Description:* |
   | ==data/Sandbox/ImagePluginTest.txt== |  |
   | ==data/TWiki/ImagePlugin.txt== |  |
   | ==lib/TWiki/Plugins/ImagePlugin/Core.pm== |  |
   | ==lib/TWiki/Plugins/ImagePlugin.pm== |  |
   | ==pub/Sandbox/ImagePluginTest/STS-32_crew.jpg== |  |
   | ==pub/Sandbox/ImagePluginTest/Tst.png== |  |
   | ==pub/Sandbox/ImagePluginTest/Westminstpalace.jpg== |  |
   | ==pub/TWiki/ImagePlugin/WestminstpalaceSample.png== |  |
   | ==pub/TWiki/ImagePlugin/magnify-clip.png== |  |
   | ==pub/TWiki/ImagePlugin/style.css== |  |

   * Optionally, run ==%TOPIC%_installer== to automatically check and install
     other TWiki modules that this module depends on. You can also do this step
     manually.
   * Alternatively, manually make sure the dependencies listed in the table below are resolved.
     <table border="1"><tr><th>Name</th><th>Version</th><th>Description</th></tr><tr><td align="left">Graphics::Magick</td><td align="left">&gt;=1.1.11</td><td align="left">Required.</td></tr><tr><td align="left">Image::Magick</td><td align="left">&gt;=6.2.4.5</td><td align="left">Optional.</td></tr></table>
   * Configure the Plugin:
      * Run the [[%SCRIPTURL%/configure%SCRIPTSUFFIX%][configure]] script to enable the Plugin
      * Change the Plugin settings as needed
   * Test if the installation was successful:
      * For complete example see Sandbox.ImagePluginTest

---++ Plugin Info

   * Set SHORTDESCRIPTION = Control the display and alignment of images using an easy syntax

|  Plugin Author: | TWiki:Main.CraigMeyer |
|  Copyright: | &copy; 2006, TWiki:Main.CraigMeyer, %BR% &copy; 2006-2008 Michael Daum http://michaeldaumconsulting.com, %BR% &copy; 2006-2010 TWiki:TWiki.TWikiContributor |
|  License: | GPL ([[http://www.gnu.org/copyleft/gpl.html][GNU General Public License]]) |
|  Plugin Version: | 19301 (2010-08-01) |
|  Change History: | <!-- versions below in reverse order -->&nbsp; |
|  2010-08-01: | TWikibug:Item6530 - doc fixes; changing TWIKIWEB to SYSTEMWEB |
|  03 Jul 2008: | fixed parsing the type parameter; \
                  fixing docu about the default THUMBNAIL_SIZE; \
                  added new default format =plain=; \
                  plainify text to be used in a html attribute position, e.g. titles; \
                  default to no img alignment; \
                  refresh images on a =?refresh=on= url param; \
                  using LWP::UserAgent instead of LWP::Simple to mirror images; \
                  using =Resize= instead of =Scale= for higher quality thumbnails; \
                  don't encrypt the href param |
|  03 Mar 2008: | make implementation of image mage configurable, \
                 defaulting to Graphics::Magick as Image::Magick has got issues \
                 using perl accellerators like mod_perl, speedy-cgi |
|  03 Jan 2008: | added processing of remote images |
|  18 Dec 2006: | fixed image lookup order; fixed html formats; added <nop>I18N workaround |
|  18 Aug 2006: | fixed html errors; \
                  removed references to <nop>ImgPlugin thus not showing the magnify-clip; \
		  some html and css fixes to resemble closer to the <nop>MediaWiki examples |
|  17 Aug 2006: | width and height arguments had no effect; floating images not clearing proberly on IE |
|  16 June 2006: | released into the public |
|  10 May 2006: | Initial version by forking <nop>ImgPlugin |
|  TWiki Dependency: | $TWiki::Plugins::VERSION 1.1 |
|  CPAN Dependencies: | CPAN:Graphics::Magick; CPAN:LWP::UserAgent; CPAN:Digest::MD5 |
|  Other Dependencies: |  |
|  Perl Version: | 5.8 |
|  [[TWiki:Plugins/Benchmark][Benchmarks]]: | %SYSTEMWEB%.GoodStyle nn%, %SYSTEMWEB%.FormattedSearch nn%, %TOPIC% nn% |
|  Plugin Home: | http://twiki.org/cgi-bin/view/Plugins/%TOPIC% |
|  Feedback: | http://twiki.org/cgi-bin/view/Plugins/%TOPIC%Dev |
|  Appraisal: | http://twiki.org/cgi-bin/view/Plugins/%TOPIC%Appraisal |

__Related Topics:__ %SYSTEMWEB%.TWikiPlugins, %SYSTEMWEB%.UserDocumentationCategory
Attachments
Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	magnify-clip.png	r1	manage	0.3 K	09 Oct 2006 - 08:40	TWikiContributor
css	style.css	r1	manage	1.4 K	10 Jan 2007 - 15:23	TWikiContributor
png	WestminstpalaceSample.png	r1	manage	105.2 K	30 Jul 2007 - 12:00	TWikiContributor
Topic revision: r0 - 02 Aug 2010 - TWikiContributor
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