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2008-06-12 Emmanuele Bassi <ebassi@openedhand.com>

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* clutter/clutter-actor.c: Add more clarifications on the
	size and position accessors and the distinction between
	transformed and untransformed actor box inside the actor's
	description.
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Emmanuele Bassi 2008-06-12 16:34:50 +00:00
parent da8eea1842
commit 13df7d579d
2 changed files with 32 additions and 2 deletions
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ChangeLog
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@ -1,3 +1,10 @@
2008-06-12 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-actor.c: Add more clarifications on the
size and position accessors and the distinction between
transformed and untransformed actor box inside the actor's
description.
2008-06-12 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-actor.c: Clarify the documentation of the

27
clutter/clutter-actor.c
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@ -40,6 +40,13 @@
* <graphic fileref="actor-box.png" format="PNG"/>
* </figure>
*
* The actor box represents the untransformed area occupied by an actor. Each
* visible actor that has been put on a #ClutterStage also has a transformed
* area, depending on the actual transformations applied to it by the
* developer (scale, rotation), the transformations applied by its
* containers, the transformations applied to the containers themselves and,
* finally, the perspective transformations applied to the #ClutterStage.
*
* The OpenGL modelview matrix for the actor is constructed from
* the actor settings by the following order of operations:
* <orderedlist>
@ -51,13 +58,29 @@
* <listitem><para>Rotation around y axis,</para></listitem>
* <listitem><para>Rotation around x axis,</para></listitem>
* <listitem><para>Translation by actor depth (z),</para></listitem>
* <listitem><para>Clip stencil is applied (not an operation on the matrix
* as such, but done as part of the transform set up).</para></listitem>
* <listitem><para>Clip stencil is applied (this is not an operation on
* the matrix as such, but it is done as part of the transform set
* up).</para></listitem>
* </orderedlist>
*
* <note>The position of any children is referenced from the top-left corner of
* the parent, not the parent's anchor point.</note>
*
* An actor can either be explicitly sized and positioned, using the
* various size and position accessors, like clutter_actor_set_x() or
* clutter_actor_set_width(); or it can have a preferred width and
* height, which then allows a layout manager to implicitly size and
* position it by "allocating" an area for an actor.
*
* When accessing the position and size of an actor, the simple accessors
* like clutter_actor_get_width() and clutter_actor_get_x() will return
* a value depending on whether the actor has been explicitly sized and
* positioned by the developer or implicitly by the layout manager.
*
* Depending on whether you are querying an actor or implementing a
* layout manager, you should either use the simple accessors or use the
* size negotiation API.
*
* Events are handled in the following ways:
* <orderedlist>
* <listitem><para>Actors emit pointer events if set reactive, see