Guida avanzata alla wiki

Da Wiki - ForgottenWorld.

Guida alle modifiche avanzate alla wiki. Prima di affrontare la pagina, prendere familiarità con la Guida alla wiki.

Immagini

Questa sezione spiega la sintassi legata alle immagini quando si modificano le pagine della wiki. Ogni immagine deve prima essere caricata per poter essere usata in una pagina.

Le immagini sono renderizzate usando il prefisso namespace File: ma anche il prefisso Image: è ancora supportato come sinonimo. Il prefisso alternativo Media: si può usare come riferimento al contenuto originale (per renderizzare o scaricare il media all'esterno dello spazio wiki).

Formati supportati per le immagini

I formati seguenti sono supportati di predefinito:

  • .jpg o .jpeg : immagine bitmap compressa nel formato standard JPEG, indicato per le foto.
  • .png : immagine bitmap nel formato Portable Network Graphics.
  • .gif : immagine bitmap nel formato datato Graphics Interchange Format.

Altri formati usati possono essere abilitati (non sono permessi di predefinito):

  • .svg : immagine vettoriale scalabile nel formato Scalable Vector Graphics.
  • .tiff : Tagged image format. Si usa spesso per le immagini di archivio ad alta risoluzione.
  • .ogg, .oga, .ogv : Ogg multimedia (audio o video). Non è un formato immagine ma si usa in modo simile.
  • .pdf : documenti multipagina nel Portable Document Format.
  • .djvu : documenti multipagina bitmap nel formato DejaVu (spesso scansioni di libri).
    Solo una pagina per volta di file .pdf o .djvu viene mostrata.

Rendering di un'immagine singola

Sintassi

La sintassi completa per inserire un'immagine è la seguente:

[[File:nomefile.estensione|opzioni|didascalia]]

in cui le opzioni possono essere o nessuna o alcune delle seguenti, separate da barre verticali (|).

  • Formato: scegliere tra border e/o frameless, frame, thumb (o thumbnail);
    Controlla come l'immagine è formattata e inserita nella pagina.
  • Ridimensionare: a scelta tra
    • {larghezza}px — Ridimensiona alla larghezza fissata senza ridurre l'altezza;
    • x{altezza}px — Ridimensiona alla altezza fissata senza ridurre la larghezza;
    • {larghezza}x{altezza}px — Ridimensiona alle dimensioni specificate, in pixel;
    • upright — Ridimensiona a valori ragionevoli, secondo le preferenze utente (per immagini con altezza maggiore della larghezza).
    Da notare che l'immagine mantiene sempre il rapporto altezza-larghezza, e può solo essere ridotta a meno che non sia in formato vettoriale (non bitmap).
    La dimensione massima predefinita dipende dal formato e le dimensioni interne (a seconda del tipo di oggetto).
  • Allineamento orizzontale: scegliere tra left, right, center, none;
    Controlla l'allineamento orizzontale (dentro il testo o no, o stili floating) dell'immagine entro un testo (nessun valore predefinito).
  • Allineamento verticale: scegliere tra baseline, sub, super, top, text-top, middle, bottom, text-bottom;
    Controlla l'allineamento verticale di una immagine non-floating rispetto al testo prima o dopo, e nello stesso paragrafo (valore predefinito è middle).
  • Link: scegliere tra
    • link={bersaglio} — Permette di cambiare il bersaglio del link, attivabile sulla immagine, al clic.; per esempio [[File:Example.jpg|20px|link=http://www.wikipedia.org]] diventa Example.jpg (link esterno), o [[File:Example.jpg|20px|link=MediaWiki]] diventa Example.jpg (link interno).
    • link= (con un campo vuoto) — (MediaWiki 1.14+) Mostra un'immagine senza link attivabili; per esempio [[File:Example.jpg|20px|link=]] diventa Example.jpg.
      • ! Con il codice |link=| (vuoto), nessun title sarà mostrato.
  • Altre opzioni:
    • alt={testo alternativo} — (MediaWiki 1.14+) Definisce il testo alternativo di un'immagine che sarà mostrato se l'immagine non potrà essere inserita o scaricata.
    • page={numero} — Mostra il numero di pagina specificato (solo con file .djvu o .pdf).
    • class={classe html} — (MediaWiki 1.20+) Definisce le classi (mappe per l'attributo HTML class="..." dell'elemento <img /> generato).

Se un parametro non corrisponde alle possibilità fissate, è visto come testo della didascalia. Tale testo sarà mostrato sotto l'immagine nei formati thumb' e frame, o come tooltip negli altri formati. I testi della didascalia in modalità frame e thumb possono contenere link e altre formattazioni.

Se 'alt' non è specificato ma la didascalia sì, il testo alternativo sarà costituito sulla base della didascalia, senza formattazione.

Formato

La tabella descrive i formati disponibili.

Se l'altezza dell'immagine in thumbnail è maggiore della larghezza, e si ritiene troppo grande, si può provare l'opzione upright=N, con N il rapporto larghezza su altezza (predefinito è 0.75). L'alternativa è specificare la massima altezza, in pixel.

Da notare che scrivere thumb={nomefile}, permette di usare una diversa immagine come thumbnail.

Size and frame

Among different formats, the effect of the size parameter may be different, as shown below.

  • For how it appears when its size is not specified, see Format section above.
  • When the format is not specified, or only bordered, the size can be both reduced and enlarged to any specified size.
  • In the examples below, the original size of the image is 400 × 267 pixels.
  • An image with frame always ignores the size specification, the original image will be reduced if it exceeds the maximum size defined in user preferences.
  • The size of an image with thumb can be reduced, but can not be enlarged beyond the original size of the image.
Format Reduced Enlarged

Horizontal alignment

Note that when using the frame or thumb[nail] formats, the default horizontal alignment will be right.

Description You type You get

Vertical alignment

The vertical alignment options take effect only if the image is rendered as an inline element and is not floating. They alter the way the inlined image will be vertically aligned with the text present in the same block before and/or after this image on the same rendered row.

Note that the rendered line of text where inline images are inserted (and the lines of text rendered after the current one) may be moved down (this will increase the line-height conditionally by additional line spacing, just as it may occur with spans of text with variable font sizes, or with superscripts and subscripts) to allow the image height to be fully displayed with this alignment constraint.

<source lang="html4strict" enclose="div">

text top: Example.jpg Example.jpg Example.jpg text

text text-top: Example.jpg Example.jpg Example.jpg text

text super: Example.jpg Example.jpg Example.jpg text

text baseline: Example.jpg Example.jpg Example.jpg text

text sub: Example.jpg Example.jpg Example.jpg text

text default: Example.jpgExample.jpg Example.jpg text

text middle: Example.jpg Example.jpg Example.jpg text

text text-bottom: Example.jpg Example.jpg Example.jpg text

text 'bottom: Example.jpg Example.jpg Example.jpg text

</source>

To show the alignment result more clearly, the text spans are overlined and underlined, the font-size is increased to 200%, and the paragraph block is outlined with a thin border; additionally images of different sizes are aligned:

text top: Example.jpg Example.jpg Example.jpg text

text text-top: Example.jpg Example.jpg Example.jpg text

text super: Example.jpg Example.jpg Example.jpg text

text baseline: Example.jpg Example.jpg Example.jpg text

text sub: Example.jpg Example.jpg Example.jpg text

text default: Example.jpg Example.jpg Example.jpg text

text middle: Example.jpg Example.jpg Example.jpg text

text text-bottom: Example.jpg Example.jpg Example.jpg text

text bottom: Example.jpg Example.jpg Example.jpg text

Notes:

  1. The "middle" vertical alignment position of the image (which is also the default) usually refers to the middle between the x-height and the baseline of the text (on which the vertical middle of the image will be aligned, and on which usually the text may be overstroke), but not to the middle of the line-height of the font-height that refers to the space between the "text-top" and "text-bottom" positions ; the font-height excludes:
    • the additional line separation spacing normally divided equally into two line-margins (here 0.5em, according to line-height set to 200%) above and below the font-height).
    • the additional line spacing which may be added by superscripts and subscripts.
  2. However, if the image height causes its top or bottom position to go above or below the normal full line-height of text, the middle position will be adjusted after the increasing the top and/or bottom line-margins so that the image can fit and align properly, and all images (including those with smaller heights) will be vertically centered on the adjusted middle position (for computing the effective line-height, the text of each rendered row with the larger font-height will be considered).
  3. The "text-top" and "text-bottom" alignment positions also excludes the extra line spacing added by superscripts and subscripts, but not the additional line-spacing defined by the line-height.
  4. The "top" and "bottom" alignment positions take into account all these extra line spacings (including superscripts and subscripts, if they are present in a rendered line span). When the image alignment constrains the image to grow above or below the normal line-spacing, and the image is not absolutely positioned, the image will cause the "top" and "bottom" positions to be adjusted (just like superscripts and subscripts), so the effective line-height between rendered lines of text will be higher.
  5. The "underline", "overline" and "overstrike" text-decoration positions should be somewhere within these two limits and may depend on the type and height of fonts used (the superscript and subscript styles may be taken into account in some browsers, but usually these styles are ignored and the position of these decorations may not be adjusted); so these decorations normally don't affect the vertical position of images, relatively to the text.

Stopping the text flow

On occasion it is desirable to stop text (or other inline non-floating images) from flowing around a floating image. Depending on the web browser's screen resolution and such, text flow on the right side of an image may cause a section header (for instance, == My Header ==) to appear to the right of the image, instead of below it, as a user may expect. The text flow can be stopped by placing <br clear=all> (or if you prefer, <div style="clear: both"></div>) before the text that should start below the floating image. (This may also be done without an empty line by wrapping the section with the floating images with <div style="overflow: hidden">…</div>, which clears all floats inside the div element.)

All images rendered as blocks (including non-floating centered images, left- or right-floating images, as well as framed or thumbnailed floating images) are implicitly breaking the surrounding lines of text (terminating the current block of text before the image, and creating a new paragraph for the text after them). They will then stack vertically along their left or right alignment margin (or along the center line between these margins for centered images).

Altering the default link target

The following table shows how to alter the link target (whose default is the image description page) or how to remove it. Changing the link does not alter the format described in the previous sections.

Warning:

The licencing requirements on your wiki may not allow you to remove all links to the description page that displays the required authors attributions, the copyrights statements, the applicable licencing terms, or a more complete description of the rendered image (including its history of modifications).
If you change or remove the target link of an image, you will then have to provide somewhere else on your page an explicit link to this description page, or to display the copyright and author statement and a link to the applicable licence, if they are different from the elements applicable to the embedding page itself.
Your wiki policy may restrict the use of the alternate link parameter, or may even enforce a prohibition of alternate link parameters for embedded media files (in which case, the link parameter will be ignored), or may only accept them after validation by authorized users or administrators.

Rendering a gallery of images

Gallery syntax

It's easy to make a gallery of thumbnails with the <gallery> tag. The syntax is:

<gallery>
File:file_name.ext|caption|alt=alt language
File:file_name.ext|caption|alt=alt language
{...}
</gallery>

Note that the image code is not enclosed in brackets when enclosed in gallery tags.

Captions are optional, and may contain wiki links or other formatting. Some of the parameters controlling thumb output can also be used here, specifically the ones that modify the file (as opposed to ones that control where in the page the image falls). For example, with multi-paged media like pdfs, you can use code like page=4.

The File: prefix can be omitted.

For example:

<gallery>
File:Example.jpg|Item 1
File:Example.jpg|a link to [[Help:Contents]]
File:Example.jpg
File:Example.jpg|alt=An example image. It has flowers
File:Example.jpg| ''italic caption''
File:Example.jpg|on page "{{PAGENAME}}"
</gallery>

is formatted as:

Mode parameter

Template:MW 1.22 Starting in 1.22 we have an experimental mode parameter, taking options as follows:

  • traditional is the original gallery type used by MediaWiki.
  • nolines is similar to traditional, but with no border lines.
  • packed causes images to have the same height but different widths, with little space between the images. The rows in this responsive mode organize themselves according to the width of the screen.
  • packed-overlay shows the caption overlaid on the image, in a semi-transparent white box.
  • packed-hover is similar to packed-overlay, but with the caption and box only showing up on hover.

For example:

<gallery mode="packed-hover">
Image:Astronotus_ocellatus.jpg|''[[commons:Astronotus ocellatus|Astronotus ocellatus]]'' (Oscar)
Image:Salmonlarvakils.jpg|''[[commons:Salmo salar|Salmo salar]]'' (Salmon Larva)
Image:Georgia Aquarium - Giant Grouper.jpg|''[[commons:Epinephelus lanceolatus|Epinephelus lanceolatus]]'' (Giant grouper)
Image:Pterois volitans Manado-e.jpg|''[[commons:Pterois volitans|Pterois volitans]]'' (Red Lionfish)
Image:Macropodus opercularis - front (aka).jpg|''[[commons:Macropodus opercularis|Macropodus opercularis]]'' (Paradise fish)
Image:Canthigaster valentini 1.jpg|''[[commons:Canthigaster valentini|Canthigaster valentini]]'' (Valentinni's sharpnose puffer)
Image:Flughahn.jpg|[[Image:POTY ribbon 2007.svg|25px]] ''[[commons:Dactylopterus volitans|Dactylopterus volitans]]'' (Flying gurnard)
Image:Fishmarket 01.jpg|''[[commons:Semicossyphus pulcher|Semicossyphus pulcher]]'' (California Sheephead)
Image:Pseudorasbora parva(edited version).jpg|''[[commons:Category:Pseudorasbora parva|Pseudorasbora parva]]'' (Topmouth gudgeon)
Image:MC Rotfeuerfisch.jpg|''[[commons:Category:Pterois antennata|Pterois antennata]]'' (Antennata Lionfish)
Image:Cleaning station konan.jpg|''[[commons:Novaculichthys taeniourus|Novaculichthys taeniourus]]''
Image:Synchiropus splendidus 2 Luc Viatour.jpg|''[[commons:Synchiropus splendidus|Synchiropus splendidus]]'' (Mandarin fish)
File:Psetta maxima Luc Viatour.jpg|''[[commons:Psetta maxima|Psetta maxima]]'' (Turbot)
File:Australian blenny.jpg|''[[commons:Category:Ecsenius|Ecsenius axelrodi]]''
</gallery>

Gives (mode: packed-hover):

Examples of the other modes:

mode="traditional"

mode="nolines"

mode="packed"

mode="packed-overlay"

Optional gallery attributes

The gallery tag itself takes several additional parameters, specified as attribute name-value pairs:

<gallery {parameters}>
{images}
</gallery>
  • caption="{caption}": (caption text between double quotes for more than a word) sets a caption centered atop the gallery.
  • widths={width}px: sets the widths of the images, default 120px. Note the plural, widths.
  • heights={heights}px: sets the (max) heights of the images.
  • perrow={integer}: sets the number of images per row. 0 means automatically adjust based on width of screen.
  • showfilename={anything}: Show the filenames of the images in the individual captions for each image (1.17+).
  • mode={traditional|nolines|packed|packed-hover|packed-overlay}: See section above (1.22+).

Template:Note

Example:

Coding:

<gallery widths=60px heights=60px perrow=7 caption="sunflowers are groovy">
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
File:Example.jpg
</gallery>

Result:

Row of images that will wrap to browser width

The only thing that works for a row of images with varying widths is not to use "thumb" or "left" or "none".

[[File:Example.jpg|300px]]
[[File:Example.jpg|100px]]
[[File:Example.jpg|150px]]
[[File:Example.jpg|250px]]
[[File:Example.jpg|200px]]
[[File:Example.jpg|50px]]
[[File:Example.jpg|220px]]
[[File:Example.jpg|175px]]

Example.jpg Example.jpg Example.jpg Example.jpg Example.jpg Example.jpg Example.jpg Example.jpg

Some wiki farms do not have all gallery options (such as "widths"). Also, sometimes one wants varying widths for images in a row. Outside of a gallery it is impossible to have individual captions for images in a row of images that will wrap to the browser width. Try it and see. Nothing works. Images will either overlap stuff on the right, or force a horizontal scroll bar.

Using a left float ("left") for some images, combined with "none" for some of the images, will not work consistently either, especially if there is also a right sidebar of images. Weird things will occur. At narrower browser or screen widths an image out of the row may appear far down the page after the end of the right sidebar of images.

If "thumb" is not used (and thus no captions) a row of images will wrap to the browser width.

Link behavior

By default an image links to its file description page. The "link=" option modifies this behavior to link to another page or website, or to turn off the image's linking behavior. Alternatively, you can create a text link to an image's description page or to the image itself.

Text link to image's file description page

Use a colon (:) before File: to link to image's file description page:

File:Esempio.jpg

[[:File:Esempio.jpg]]

Sunflowers

[[:File:Esempio.jpg|Sunflowers]]

Text link to actual image

Use pseudo-namespace “Media” for a text link to the actual image:

Media:Esempio.jpg

[[Media:Esempio.jpg]]

Sunflowers

[[Media:Esempio.jpg|Sunflowers]]

(If above gets you instead a text link to the image's file description, not a link to the actual image, perhaps your wiki's namespaces are configured out of compliance with this feature?)


Display image, link it to another page or website

Use "link=" option to link image to another page or website:

Clicking on the below image will take you to MediaWiki:

[[File:Wiki.png|50px|link=MediaWiki]]

50px

Clicking on the below image will take you to example.com:

[[File:Wiki.png|50px|link=http://example.com]]

50px

Display image, turn off link

Use "link=" option with no value assigned to turn link off entirely; the below image is not a link:

[[File:Wiki.png|50px|link=]]

50px

Requisites

Before using images in your page, the system administrator of your wiki must have Template:Mediawiki and a user has to upload the file. System administrators may also set the wiki to accept files from Template:Mediawiki, such as the Wikimedia Commons. For server side image resizing it is necessary to have a scaler configured (such as GD2, ImageMagick, etc.).

Files at other websites

You can link to an external file available online using the same syntax used for linking to an external web page. With these syntaxes, the image will not be rendered, but only the text of the link to this image will be displayed.

[http://url.for/some/image.png]

Or with a different displayed text:

[http://url.for/some/image.png link text here]

Additional MediaWiki markup or HTML/CSS formatting (for inline elements) is permitted in this displayed text (with the exception of embedded links that would break the surrounding link):

[http://www.example.com/some/image.png Example '''<del>rich</del>''' ''<ins>link text</ins>'' here.]

which renders as: Example rich link text<ins> here.

If it is enabled on your wiki (see Template:Mediawiki), you can also embed external images. To do that, simply insert the image's url:

http://url.for/some/image.png

Currently, embedded images cannot be resized, but they may be formatted by surrounding MediaWiki markup or HTML/CSS code.

If this wiki option is not enabled, the image will not be embedded but rendered as a textual link to the external site, just like above.

Elenchi

Tabelle

Categorie

Sottopagine

Gestire i file

Spostare (rinominare) una pagina

Redirect

Cancellare una pagina

Pagine protette

Template

Magic words

Namespace

Fonti

Pagine speciali

Ricerche esterne

Bot

Voci correlate