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# File 'lib/fusuma/plugin/detectors/touch_detectors/pinch_detector.rb', line 10
def detect(touch_buffer)
MultiLogger.debug('> pinch 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(' distance change between first 2 fingers?')
first_finger, second_finger = touch_buffer.finger_movements.values[0..1]
begin_distance = Touchscreen::Math.distance(first_finger[:first_position], second_finger[:first_position])
end_distance = Touchscreen::Math.distance(first_finger[:last_position], second_finger[:last_position])
distance = end_distance - begin_distance
return unless distance.abs > jitter_threshold
direction = distance <=> 0
MultiLogger.debug(" assuming direction is #{direction}, testing all pairs of fingers")
is_pinch = catch(:not_a_pinch) do
pairs = touch_buffer.finger_movements.keys.combination(2).to_a
pairs.each do |finger1, finger2|
begin_distance = Touchscreen::Math.distance(
touch_buffer.finger_movements[finger1][:first_position],
touch_buffer.finger_movements[finger2][:first_position]
)
end_distance = Touchscreen::Math.distance(
touch_buffer.finger_movements[finger1][:last_position],
touch_buffer.finger_movements[finger2][:last_position]
)
MultiLogger.debug(" fingers #{finger1} and #{finger2} moved from #{begin_distance} to #{end_distance}")
this_distance = end_distance - begin_distance
if this_distance.abs < jitter_threshold
MultiLogger.debug(" !distance between fingers #{finger1} and #{finger2} is not changed enough (#{this_distance.abs}), not a pinch")
throw(:not_a_pinch)
end
this_direction = this_distance <=> 0
if this_direction != direction
MultiLogger.debug(" !fingers #{finger1} and #{finger2} moved in direction #{this_direction}, not a pinch")
throw(:not_a_pinch)
end
end
true
end
return unless is_pinch
direction = direction == -1 ? :in : :out
MultiLogger.debug(" pinch #{direction} detected!")
Plugin::Events::Records::TouchRecords::PinchRecord.new(finger: touch_buffer.finger, direction: direction)
end
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