Class: Qrio::Neighbor

Inherits:
Object
  • Object
show all
Defined in:
lib/qrio/neighbor.rb

Overview

track angle and distance between two Finder Patterns

Constant Summary collapse

ANGLE = 
Math::PI / 8
ZERO = 
0..ANGLE
NINETY = 
(ANGLE * 3)..(ANGLE * 5)
ONEEIGHTY = 
(ANGLE * 7)..(ANGLE * 8)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source, destination) ⇒ Neighbor

Returns a new instance of Neighbor.



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# File 'lib/qrio/neighbor.rb', line 11

def initialize(source, destination)
  @source      = source
  @destination = destination

  source.neighbors << self

  dx = destination.center.first - source.center.first
  # images are top down, geometry is bottom up.  invert.
  dy = source.center.last - destination.center.last

  @angle    = Math.atan2(dy, dx)
  @distance = Math.sqrt(dx ** 2 + dy ** 2)
end

Instance Attribute Details

#angle ⇒ Object (readonly)

Returns the value of attribute angle.



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# File 'lib/qrio/neighbor.rb', line 4

def angle
  @angle
end

#destination ⇒ Object (readonly)

Returns the value of attribute destination.



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# File 'lib/qrio/neighbor.rb', line 4

def destination
  @destination
end

#distance ⇒ Object (readonly)

Returns the value of attribute distance.



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# File 'lib/qrio/neighbor.rb', line 4

def distance
  @distance
end

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/qrio/neighbor.rb', line 4

def source
  @source
end

Instance Method Details

#right_angle? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/qrio/neighbor.rb', line 33

def right_angle?
  ZERO.include?(angle.abs)      ||
  NINETY.include?(angle.abs)    ||
  ONEEIGHTY.include?(angle.abs)
end

#to_coordinates ⇒ Object 



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# File 'lib/qrio/neighbor.rb', line 25

def to_coordinates
  [source.center, destination.center].flatten
end

#to_s ⇒ Object 



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# File 'lib/qrio/neighbor.rb', line 29

def to_s
  "N[#{ to_coordinates * ',' }]"
end