Class: Fusuma::Plugin::Detectors::TouchDetectors::RotateDetector

Inherits:
Base
  • Object
show all
Defined in:
lib/fusuma/plugin/detectors/touch_detectors/rotate_detector.rb

Instance Method Summary collapse

Instance Method Details

#detect(touch_buffer) ⇒ Object 



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# File 'lib/fusuma/plugin/detectors/touch_detectors/rotate_detector.rb', line 10

def detect(touch_buffer)
  MultiLogger.debug('> rotate detector')

  MultiLogger.debug('  movement?')
  return unless touch_buffer.moved?

  MultiLogger.debug('  at least 2 fingers?')
  return unless touch_buffer.finger_movements.size >= 2

  # MultiLogger.debug('  center is static?')
  # begin_center = Touchscreen::Math.center(touch_buffer.finger_movements.map { |_, v| v[:first_position] })
  # end_center = Touchscreen::Math.center(touch_buffer.finger_movements.map { |_, v| v[:last_position] })
  # return unless Touchscreen::Math.distance(begin_center, end_center) <= center_jitter_threshold

  MultiLogger.debug('  angle change for the first finger?')
  center = Touchscreen::Math.center(touch_buffer.finger_movements.map { |_, v| v[:first_position] })
  first_finger = touch_buffer.finger_movements.values.first
  begin_angle = Touchscreen::Math.angle_between(center, first_finger[:first_position])
  end_angle = Touchscreen::Math.angle_between(center, first_finger[:last_position])
  angle_change = Touchscreen::Math.angles_difference(end_angle, begin_angle)
  MultiLogger.debug("    (#{angle_change})")
  return unless angle_change.abs > angle_threshold

  direction = angle_change <=> 0
  MultiLogger.debug("  assuming direction is #{direction} (from #{begin_angle} to #{end_angle}), testing all fingers")

  is_rotate = catch(:not_a_rotate) do
    touch_buffer.finger_movements.except(0).each do |finger, movement|
      begin_angle = Touchscreen::Math.angle_between(center, movement[:first_position])
      end_angle = Touchscreen::Math.angle_between(center, movement[:last_position])
      this_angle_change = Touchscreen::Math.angles_difference(end_angle, begin_angle)
      if this_angle_change.abs < angle_threshold
        MultiLogger.debug("  !angle for finger #{finger} is not changed enough (#{this_angle_change.abs}), not a rotate")
        throw(:not_a_rotate)
      end
      this_direction = this_angle_change <=> 0
      if this_direction != direction
        MultiLogger.debug("  !finger #{finger} moved in direction #{this_direction} (from #{begin_angle} to #{end_angle}, not a rotate")
        throw(:not_a_rotate)
      end
    end
    true
  end
  return unless is_rotate

  direction = direction == -1 ? :clockwise : :counterclockwise
  MultiLogger.debug("  rotate #{direction} detected!")

  Plugin::Events::Records::TouchRecords::RotateRecord.new(finger: touch_buffer.finger, direction: direction)
end