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<partintro>
<para>Clutter is a GObject based library for creating fast, visually rich
graphical user interfaces.</para>
<para>Clutter semantics work by having a stage (a window) and then adding
actors (widgets) to the stage and manipulating via the actor api. Actors
can contain child actors (ClutterGroup for example) and be manipulated
as a whole.</para>
<para>Animations and visual effects can be created via the use of timelines
and behaviours. Timelines provide accurate frame based animations.
Behaviours further extend this by taking a timeline, a control function
(<link linkend="class-clutteralpha"><classname>clutter.Alpha</classname></link>)
and then applying to actors as to modify a property as a function of time.</para>
</partintro>
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