ImagePlugin

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:
You type:

%IMAGE{"WestminstpalaceSample.png"
  type="frame" 
  align="none" 
  caption="caption text"
}%

You get:

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 [<web>.]<topic> . For example putting

   * Set IMAGEALBUM = TWiki.ImagePlugin

into the current topic will search all images at the given topic.

Syntax

%IMAGE{"foo.gif" ...}%

There are four predefined format types (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: %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|center|right|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|link|thumb[nail]|frame|float"	empty
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 <width>[px][x<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

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

Plugin Installation Instructions

• Download the ZIP file
• Unzip ImagePlugin.zip in your twiki installation directory. Content:

  File:	Description:

%$MANIFEST%

• Optionally, run ImagePlugin_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. %$DEPENDENCIES%
• Configure the Plugin:
  • TWiki 4.0 and up: Run the configure script to enable the Plugin
  • Change the Plugin settings as needed
• Test if the installation was successful:
  • For complete example see ImagePluginTest

Plugin Info

Plugin Author:	TWiki:Main.CraigMeyer
Copyright:	© 2006, TWiki:Main.CraigMeyer, © 2006-2008 Michael Daum http://michaeldaumconsulting.com
License:	GPL (GNU General Public License)
Plugin Version:	1.1
Change History:
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 I18N workaround
18 Aug 2006:	fixed html errors; removed references to ImgPlugin thus not showing the magnify-clip; some html and css fixes to resemble closer to the 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 ImgPlugin
TWiki Dependency:	$TWiki::Plugins::VERSION 1.1
CPAN Dependencies:	CPAN:Graphics::Magick; CPAN:LWP::Simple; CPAN:Digest::MD5
Other Dependencies:
Perl Version:	5.8
Benchmarks:	GoodStyle nn%, FormattedSearch nn%, ImagePlugin nn%
Plugin Home:	TWiki:Plugins/ImagePlugin
Feedback:	TWiki:Plugins/ImagePluginDev
Appraisal:	TWiki:Plugins/ImagePluginAppraisal

-- TWiki:Main.CraigMeyer
-- TWiki:Main.MichaelDaum - 03 Mar 2008