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* DOCS: ~Numeric#frame_index~
This function is helpful for determining the index of frame-by-frame
sprite animation. The numeric value ~self~ represents the moment the
animation started.
~frame_index~ takes three additional parameters:
- How many frames exist in the sprite animation.
- How long to hold each animation for.
- Whether the animation should repeat.
~frame_index~ will return ~nil~ if the time for the animation is out
of bounds of the parameter specification.
Example using variables:
#+begin_src ruby
def tick args
start_looping_at = 0
number_of_sprites = 6
number_of_frames_to_show_each_sprite = 4
does_sprite_loop = true
sprite_index =
start_looping_at.frame_index number_of_sprites,
number_of_frames_to_show_each_sprite,
does_sprite_loop
sprite_index ||= 0
args.outputs.sprites << [
640 - 50,
360 - 50,
100,
100,
"sprites/dragon-#{sprite_index}.png"
]
end
#+end_src
Example using named parameters:
#+begin_src ruby
start_looping_at = 0
sprite_index =
start_looping_at.frame_index count: 6,
hold_for: 4,
repeat: true
sprite_index ||= 0
args.outputs.sprites << [
640 - 50,
360 - 50,
100,
100,
"sprites/dragon-#{sprite_index}.png"
]
#+end_src
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