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2008-02-08 Emmanuele Bassi <ebassi@openedhand.com>

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* clutter/clutter-behaviour-path.c: Move the nice graph and
	description from the Path behaviour...

	* clutter/clutter-behaviour.c: ... to the main Behaviour class.
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Emmanuele Bassi 2008-02-08 15:39:41 +00:00
parent 4fb09b9db9
commit 143be77205
3 changed files with 26 additions and 13 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2008-02-08 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-behaviour-path.c: Move the nice graph and
description from the Path behaviour...
* clutter/clutter-behaviour.c: ... to the main Behaviour class.
2008-02-08 Emmanuele Bassi <ebassi@openedhand.com> 2008-02-08 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-behaviour-path.c: Add a paragraph describing * clutter/clutter-behaviour-path.c: Add a paragraph describing

12
clutter/clutter-behaviour-path.c
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@ -40,18 +40,6 @@
* knot in the path is reached with the upper bound value provided by * knot in the path is reached with the upper bound value provided by
* the #ClutterAlpha object used by the behaviour. * the #ClutterAlpha object used by the behaviour.
* *
* <figure id="behaviour-path-alpha">
* <title>Effects of alpha functions on a path</title>
* <graphic fileref="path-alpha-func.png" format="PNG"/>
* </figure>
*
* The actors position between the path's end points directly correlates
* to the #ClutterAlpha's current alpha value driving the behaviour. With
* the #ClutterAlpha's function set to %CLUTTER_ALPHA_RAMP_INC the actor
* will follow the path at a constant velocity, but when changing to
* %CLUTTER_ALPHA_SINE_INC the actor initially accelerates quickly before
* quickly decelerating.
*
* <note>If the alpha function is a periodic function, i.e. it returns to * <note>If the alpha function is a periodic function, i.e. it returns to
* 0 after reaching %CLUTTER_ALPHA_MAX_ALPHA, then the actors will walk * 0 after reaching %CLUTTER_ALPHA_MAX_ALPHA, then the actors will walk
* the path back to the starting #ClutterKnot.</note> * the path back to the starting #ClutterKnot.</note>

18
clutter/clutter-behaviour.c
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@ -42,11 +42,29 @@
* of a set of actors; #ClutterBehaviourScale, which controls the width * of a set of actors; #ClutterBehaviourScale, which controls the width
* and height of a set of actors. * and height of a set of actors.
* *
* To visualize the effects of different alpha functions on a
* #ClutterBehaviour implementation it is possible to take the
* #ClutterBehaviourPath as an example:
*
* <figure id="behaviour-path-alpha">
* <title>Effects of alpha functions on a path</title>
* <graphic fileref="path-alpha-func.png" format="PNG"/>
* </figure>
*
* The actors position between the path's end points directly correlates
* to the #ClutterAlpha's current alpha value driving the behaviour. With
* the #ClutterAlpha's function set to %CLUTTER_ALPHA_RAMP_INC the actor
* will follow the path at a constant velocity, but when changing to
* %CLUTTER_ALPHA_SINE_INC the actor initially accelerates before quickly
* decelerating.
*
* In order to implement a new behaviour you should subclass #ClutterBehaviour * In order to implement a new behaviour you should subclass #ClutterBehaviour
* and override the "alpha_notify" virtual function; inside the overridden * and override the "alpha_notify" virtual function; inside the overridden
* function you should obtain the alpha value from the #ClutterAlpha * function you should obtain the alpha value from the #ClutterAlpha
* instance bound to the behaviour and apply it to the desiderd property * instance bound to the behaviour and apply it to the desiderd property
* (or properties) of every actor controlled by the behaviour. * (or properties) of every actor controlled by the behaviour.
*
* #ClutterBehaviour is available since Clutter 0.2
*/ */
#ifdef HAVE_CONFIG_H #ifdef HAVE_CONFIG_H