Class: RGame::Engine::Animator

Inherits:
Object
  • Object
show all
Defined in:
lib/rgame/engine/animator.rb

Overview

Owns animation playback state for one actor: the AnimationSet plus the current animation name and elapsed time. Pure logic — the renderer asks it for the current [row, col, flip_x] cell. This is what makes an actor own its own animations instead of the scene passing an AnimationSet in every frame.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(animation_set, initial: :stand) ⇒ Animator

Returns a new instance of Animator.



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# File 'lib/rgame/engine/animator.rb', line 10

def initialize(animation_set, initial: :stand)
  @animation_set = animation_set
  @current = initial
  @elapsed = 0.0
end

Instance Attribute Details

#current ⇒ Object (readonly)

Returns the value of attribute current.



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# File 'lib/rgame/engine/animator.rb', line 16

def current
  @current
end

#elapsed ⇒ Object (readonly)

Returns the value of attribute elapsed.



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# File 'lib/rgame/engine/animator.rb', line 16

def elapsed
  @elapsed
end

Instance Method Details

#col ⇒ Object 



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# File 'lib/rgame/engine/animator.rb', line 34

def col = @animation_set.col(@current, @elapsed)

#flip_x ⇒ Object 



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# File 'lib/rgame/engine/animator.rb', line 35

def flip_x = @animation_set.flip_x(@current)

#frame ⇒ Object

[row, col, flip_x] for the current animation at the current elapsed time. A convenience for tests/inspection; it allocates, so draw uses the accessors above.



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# File 'lib/rgame/engine/animator.rb', line 39

def frame
  @animation_set.frame(@current, @elapsed)
end

#play(name) ⇒ Object

Switch to name; restarts elapsed time on an actual change (a no-op if the animation is already playing, so a continuing walk keeps cycling).



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# File 'lib/rgame/engine/animator.rb', line 20

def play(name)
  return if name == @current

  @current = name
  @elapsed = 0.0
end

#row ⇒ Object

Current animation's row/col/flip_x, resolved without allocating — the per-frame draw path reads these directly.



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# File 'lib/rgame/engine/animator.rb', line 33

def row = @animation_set.row(@current)

#update(dt) ⇒ Object 



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# File 'lib/rgame/engine/animator.rb', line 27

def update(dt)
  @elapsed += dt
end