Class: Fusuma::Plugin::Detectors::PinchDetector

Inherits:
Detector
  • Object
show all
Defined in:
lib/fusuma/plugin/detectors/pinch_detector.rb

Defined Under Namespace

Classes: Direction, Quantity

Constant Summary collapse

SOURCES = 
['gesture'].freeze
BUFFER_TYPE = 
'gesture'
GESTURE_RECORD_TYPE = 
'pinch'
FINGERS = 
[2, 3, 4].freeze
BASE_THERESHOLD = 
1.3

Instance Method Summary collapse

Methods inherited from Detector

#create_event, #first_time?, #last_time, #sources, #tag, tag, type, #type, #watch?

Methods inherited from Base

#config_index, #config_param_types, #config_params, inherited, plugins

Methods included from CustomProcess

#fork

Instance Method Details

#create_oneshot_index(gesture:, finger:, direction:) ⇒ Config::Index

Parameters:

Returns:



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# File 'lib/fusuma/plugin/detectors/pinch_detector.rb', line 115

def create_oneshot_index(gesture:, finger:, direction:)
  Config::Index.new(
    [
      Config::Index::Key.new(gesture),
      Config::Index::Key.new(finger.to_i, skippable: true),
      Config::Index::Key.new(direction)
    ]
  )
end

#create_repeat_index(gesture:, finger:, direction:, status:) ⇒ Config::Index

Parameters:

Returns:



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# File 'lib/fusuma/plugin/detectors/pinch_detector.rb', line 100

def create_repeat_index(gesture:, finger:, direction:, status:)
  Config::Index.new(
    [
      Config::Index::Key.new(gesture),
      Config::Index::Key.new(finger.to_i),
      Config::Index::Key.new(direction, skippable: true),
      Config::Index::Key.new(status)
    ]
  )
end

#detect(buffers) ⇒ Events::Event, NilClass

Parameters:

  • buffers (Array<Buffer>)

Returns:

  • (Events::Event) —

    if event is detected

  • (NilClass) —

    if event is NOT detected



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# File 'lib/fusuma/plugin/detectors/pinch_detector.rb', line 19

def detect(buffers)
  gesture_buffer = buffers.find { |b| b.type == BUFFER_TYPE }
                          .select_from_last_begin
                          .select_by_events { |e| e.record.gesture == GESTURE_RECORD_TYPE }

  updating_events = gesture_buffer.updating_events
  return if updating_events.empty?

  finger = gesture_buffer.finger

  status = case gesture_buffer.events.last.record.status
           when 'end'
             'end'
           when 'update'
             if updating_events.length == 1
               'begin'
             else
               'update'
             end
           else
             gesture_buffer.events.last.record.status
           end

  prev_event, event = if status == 'end'
                        [
                          gesture_buffer.events[-3],
                          gesture_buffer.events[-2]
                        ]
                      else
                        [
                          gesture_buffer.events[-2],
                          gesture_buffer.events[-1]
                        ]
                      end
  delta = event.record.delta
  prev_delta = prev_event.record.delta

  repeat_direction = Direction.new(target: delta.zoom, base: (prev_delta&.zoom || 1.0)).to_s
  # repeat_quantity = Quantity.new(target: delta.zoom, base: (prev_delta&.zoom || 1.0)).to_f

  repeat_index = create_repeat_index(gesture: type, finger: finger,
                                     direction: repeat_direction,
                                     status: status)
  if status == 'update'
    return unless moved?(prev_event, event)

    first_zoom, avg_zoom = if updating_events.size >= 10
                             [updating_events[-10].record.delta.zoom,
                              gesture_buffer.class.new(
                                updating_events[-10..-1]
                              ).avg_attrs(:zoom)]
                           else
                             [updating_events.first.record.delta.zoom,
                              gesture_buffer.avg_attrs(:zoom)]
                           end

    oneshot_quantity = Quantity.new(target: avg_zoom, base: first_zoom).to_f
    oneshot_direction = Direction.new(target: avg_zoom, base: first_zoom).to_s
    oneshot_index = create_oneshot_index(gesture: type, finger: finger,
                                         direction: oneshot_direction)
    if enough_oneshot_threshold?(index: oneshot_index, quantity: oneshot_quantity)
      return [
        create_event(record: Events::Records::IndexRecord.new(
          index: oneshot_index, trigger: :oneshot, args: delta.to_h
        )),
        create_event(record: Events::Records::IndexRecord.new(
          index: repeat_index, trigger: :repeat, args: delta.to_h
        ))
      ]
    end
  end
  create_event(record: Events::Records::IndexRecord.new(
    index: repeat_index, trigger: :repeat, args: delta.to_h
  ))
end