<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" id="tech-clutter" xml:lang="it">

  <info>

    <link type="guide" xref="tech" group="clutter"/>

    <revision pkgversion="3.0" date="2011-04-05" status="incomplete"/>

    <credit type="author copyright">

      <name>Shaun McCance</name>

      <email its:translate="no">shaunm@gnome.org</email>

      <years>2011–2012</years>

    </credit>

    <include xmlns="http://www.w3.org/2001/XInclude" href="cc-by-sa-3-0.xml"/>

    <desc>Animations and scene graph</desc>

  </info>

<title>Clutter</title>

Clutter is a library for doing animations and using a 2.5-D canvas.

You create graphical objects out of images, and you can manipulate

them later to move them, rotate them, or give them quasi-3D

effects.

Clutter uses the <link href="http://www.khronos.org/opengl/">OpenGL</link>

and <link href="http://www.khronos.org/opengles/">OpenGL|ES</link> industry

standard API to access the accelerated graphical hardware on both desktop and

mobile environments alike, without exposing the complexities of GPU pipeline

programming.

Clutter does not specify any visual style, and does not provide any

pre-defined complex user interface control; it lets the developer define what

is needed, using a flexible scene graph API, with free-form placement of the

scene elements (or actors) on the main viewport (or stage).

  
Clutter comes with pre-defined actors for displaying solid colors, image

  data, text and custom high-precision 2D drawing using the

  <link xref="tech-cairo">Cairo</link> API. Clutter also provides generic

  classes for structuring a user interface using both a box-packing model like

  <link xref="tech-gtk">GTK+</link>, and a series of free-form

  constraints.

Clutter provides an extensible animation framework and graphical

effects. An animation is associated with a timeline and changes one or

more properties of one or more actors over time, for example their

rotation in a particular dimension, scale, size, opacity, etc.

A number of third-party libraries allow integration with other

technologies, such as: Clutter-GTK, for embedding a Clutter stage inside a

GTK+ application; Clutter-GStreamer, for embedding GStreamer video and audio

pipelines; Clutter-Box2D and Clutter-Bullet, for adding physics interaction

in both 2D and 3D environments.

<list style="compact">

  <item>
<link href="https://developer.gnome.org/clutter-cookbook/stable/">The Clutter Cookbook</link>
</item>

  <item>
<link href="http://developer.gnome.org/clutter/stable">Clutter Reference Manual</link>
</item>

  <item>
<link href="http://www.clutter-project.org">The Clutter web site</link>
</item>

</list>

</page>