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Clutter::Alpha.3pm
Langue: en
Version: 2008-10-14 (ubuntu - 08/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
Clutter::AlphaDESCRIPTION
The Clutter::Alpha class binds together a Clutter::Timeline and a function. At each frame of the timeline, the Alpha object will call the given function, which will receive the value of the frame and must return a value between 0 and Clutter::Alpha::MAX_ALPHA.This is an example of a simple alpha function that increments linearly:
sub linear { my $alpha = shift; my $timeline = $alpha->get_timeline(); return int($timeline->get_progress() * Clutter::Alpha->MAX_ALPHA); }
Alphas are used by Clutter::Behaviours to create implicit animations. By changing the alpha function inside a Clutter::Alpha object it's possible to change the speed of the animation.
Clutter provides some common alpha function, like ramps, sines, smoothsteps, exponential and square waves.
HIERARCHY
Glib::Object +----Glib::InitiallyUnowned +----Clutter::Alpha
METHODS
alpha = Clutter::Alpha->new ($timeline=undef, $func=undef, $data=undef)
alpha = Clutter::Alpha->new ($timeline=undef, $func=undef, $data=undef)
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- $timeline (Clutter::Timeline)
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- $func (scalar) a code reference or undef
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- $data (scalar) a scalar to pass to func or undef
Creates a new Clutter::Alpha instance binding timeline to the function referenced by func. The function reference can be a custom function or one of the alpha functions provided by Clutter, for instance:-
\&Clutter::Alpha::ramp_inc \&Clutter::Alpha::sine \&Clutter::Alpha::exp_dec
The function reference must have a signature like:
sub alpha_function { my ($alpha, $data) = @_; # $alpha is the Clutter::Alpha instance # $data is the scalar passed return $integer; }
Where integer is an unsigned integer between 0 and MAX_ALPHA.
unsigned = Clutter::Alpha->MAX_ALPHA
unsigned = $alpha->get_alpha
unsigned = $alpha->get_alpha
unsigned = $alpha->exp_dec (...)
unsigned = $alpha->exp_dec (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->exp_inc (...)
unsigned = $alpha->exp_inc (...)
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- ... (list) other arguments ignored (data, etc.)
$alpha->set_func ($func, $data=undef)
$alpha->set_func ($func, $data=undef)
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- $func (scalar) a code reference or undef
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- $data (scalar) a scalar to pass to func or undef
Sets the alpha function for alpha.
unsigned = $alpha->ramp (...)
unsigned = $alpha->ramp (...)
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- ... (list)
unsigned = $alpha->ramp_dec (...)
unsigned = $alpha->ramp_dec (...)
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- •
- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->ramp_inc (...)
unsigned = $alpha->ramp_inc (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->sine (...)
unsigned = $alpha->sine (...)
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- •
- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->sine_dec (...)
unsigned = $alpha->sine_dec (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->sine_half (...)
unsigned = $alpha->sine_half (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->sine_inc (...)
unsigned = $alpha->sine_inc (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->smoothstep_dec (...)
unsigned = $alpha->smoothstep_dec (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->smoothstep_inc (...)
unsigned = $alpha->smoothstep_inc (...)
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- ... (list) other arguments ignored (data, etc.)
unsigned = $alpha->square (...)
unsigned = $alpha->square (...)
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- •
- ... (list) other arguments ignored (data, etc.)
timeline = $alpha->get_timeline
timeline = $alpha->get_timeline
$alpha->set_timeline ($timeline)
$alpha->set_timeline ($timeline)
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- $timeline (Clutter::Timeline)
PROPERTIES
- 'alpha' (Glib::UInt : readable / private)
- Alpha value
- 'timeline' (Clutter::Timeline : readable / writable / private)
- Timeline
SEE ALSO
Clutter, Glib::Object, Glib::InitiallyUnownedCOPYRIGHT
Copyright (C) 2006 OpenedHand Ltd.This module is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public Library version 2.1, or under the terms of the Artistic License. See Clutter for the full copyright notice.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre