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[clutter-docs] Update the animation tutorial

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The Alpha API and usage has been changed by the recent overhaul
of the ClutterAlpha class; hence, we need to update the relative
documentation in the animation tutorial.
This commit is contained in:
Emmanuele Bassi 2009-01-28 16:44:22 +00:00
parent b09ee495a5
commit 0530405899
1 changed files with 12 additions and 70 deletions
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82
doc/reference/clutter/clutter-animation-tutorial.xml
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@ -290,67 +290,14 @@ main (int argc, char *argv[])
</para>
<para>
A ClutterAlpha is simply a 'function of time' (not a pixel alpha!). It
is created by referencing a source timeline and a function which
produces a value between 0 and %CLUTTER_ALPHA_MAX dependant on the
timeline position. Various prebuilt alpha functions are included
with Clutter these include
A ClutterAlpha is simply a 'function of time' (not a pixel alpha channel!).
It is created by referencing a source timeline and an "easing mode" which
produces a value between -1 and 2 depending on the progress of the
timeline. Clutter provides various easing modes, as described by
the #ClutterAnimationMode enumeration. It is also possible to register
a new animation mode using clutter_alpha_register_func() or to provide
a custom #ClutterAlphaFunc for a specific #ClutterAlpha instance.
</para>
<para>
<variablelist>
<varlistentry>
<term>%CLUTTER_ALPHA_RAMP_INC</term>
<listitem><simpara>Increasing ramp function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_RAMP_DEC</term>
<listitem><simpara>Decreasing ramp function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_RAMP</term>
<listitem><simpara>Full ramp function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SINE_INC</term>
<listitem><simpara>Increasing sine function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SINE_DEC</term>
<listitem><simpara>Decreasing sine function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SINE_HALF</term>
<listitem><simpara>Half sine function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SINE</term>
<listitem><simpara>Full sine function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SQUARE</term>
<listitem><simpara>Square waveform ("step") function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SMOOTHSTEP_INC</term>
<listitem><simpara>Increasing smooth transition step
function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_SMOOTHSTEP_DEC</term>
<listitem><simpara>Decreasing smooth transition step
function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_EXP_INC</term>
<listitem><simpara>Increasing exponential function</simpara></listitem>
</varlistentry>
<varlistentry>
<term>%CLUTTER_ALPHA_EXP_DEC</term>
<listitem><simpara>Decreasing exponential function</simpara></listitem>
</varlistentry>
</variablelist>
</para>
<para>
@ -369,10 +316,7 @@ main (int argc, char *argv[])
feature of the actor dependant on the Alpha's value. For example a
path based behaviour applied to an actor will alter its position
along the path dependant on the current alpha value over time. The
actual motion will depend on the chosen #ClutterAlphaFunc - a
#CLUTTER_ALPHA_RAMP_INC making it to move at constant speed along the
path, a #CLUTTER_ALPHA_SINE making it alternate from one end of the
path to the other with non constant speed.
actual motion will depend on the chosen "easing mode".
</para>
<para>
@ -393,9 +337,9 @@ main (int argc, char *argv[])
<blockquote>
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
the #ClutterAlpha's animation mode set to %CLUTTER_LINEAR the actor
will follow the path at a constant velocity, but when changing to
%CLUTTER_ALPHA_SINE_INC the actor initially accelerates before quickly
%CLUTTER_EASE_SINE_IN_OUT the actor initially accelerates before quickly
decelerating.
</blockquote>
</figure>
@ -468,9 +412,7 @@ main (int argc, char *argv[])
clutter_timeline_set_loop (timeline, TRUE);
/* Set an alpha func to power the behaviour */
alpha = clutter_alpha_new_full (timeline,
CLUTTER_ALPHA_SINE,
NULL, NULL);
alpha = clutter_alpha_new_full (timeline, CLUTTER_EASE_SINE_IN_OUT);
behave = clutter_behaviour_ellipse_new (alpha,
200, /* center x */
@ -576,7 +518,7 @@ main (int argc, char *argv[])
ClutterButtonEvent *event,
gpointer user_data)
{
clutter_actor_animate (actor, CLUTTER_SINE_IN_OUT, 500,
clutter_actor_animate (actor, CLUTTER_EASE_SINE_OUT, 500,
"x", event-&gt;x,
"y", event-&gt;y,
NULL);