73 lines
2.5 KiB
Ruby
73 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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# A scene represents a discreet state of gameplay. Things like the main menu,
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# game over screen, and gameplay.
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#
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# Define a new scene by adding one to `app/scenes/` and inheriting from
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# SceneInstance
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#
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# The main `#tick` of the game handles delegating to the current scene based on
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# the `args.state.scene_stack` value, which contains the current scene, as well
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# as scenes that can be "popped" back to.
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module Scene
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class << self
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# Change the current scene, and optionally reset the scene that's begin
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# changed to so any data is cleared out
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# ex:
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# Scene.switch(args, :gameplay)
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def switch(args, scene, reset: false, push_or_pop: false)
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args.state.scene_stack ||= []
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# if we're here /not/ from push or pop, clear the scene stack
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args.state.scene_stack.clear unless push_or_pop
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# if `scene` is not a `SceneInstance`, it's probably a symbol representing
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# the scene we're switching to, so go get it.
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the_scene = scene.is_a?(SceneInstance) ? scene : SCENES[scene].new(args)
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puts '---'
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puts 'switching to'
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puts scene unless scene.is_a?(SceneInstance)
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puts SCENES[scene] unless scene.is_a?(SceneInstance)
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puts the_scene
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puts '---'
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# if the stack is empty (e.g. we just cleared it), then push this scene
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args.state.scene_stack.push(the_scene) if args.state.scene_stack.empty?
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# if we asked to reset the scene, then do so.
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the_scene.reset(args) if reset
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# raise FinishTick, 'finish tick early'
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end
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# Change the current scene by pushing it onto the scene stack
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def push(args, scene, reset: false, reset_on_pop: false)
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args.state.scene_stack ||= []
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prev_scene = args.state.scene_stack.last
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prev_scene.reset_on_pop = reset_on_pop unless prev_scene.nil?
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the_scene = scene.is_a?(SceneInstance) ? scene : SCENES[scene].new(args)
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args.state.scene_stack.push(the_scene)
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switch(args, the_scene, reset: reset, push_or_pop: true)
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end
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# Return to the previous scene on the stack
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def pop(args, reset: nil)
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args.state.scene_stack&.pop
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scene = args.state.scene_stack.last
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scene = scene._?(default(args))
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reset = scene.reset_on_pop if reset.nil?
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puts reset, scene, scene.reset_on_pop
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switch(args, scene, reset: reset, push_or_pop: true)
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end
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def default(args)
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args.state.scene_stack ||= []
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SCENES[:DEFAULT].new(args)
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end
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def stack(args)
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args.state.scene_stack ||= []
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end
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end
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end
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