Class: CfSim::Link

Inherits:
Object
  • Object
show all
Defined in:
lib/cf_sim/link.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source_point, destination_point) ⇒ Link

Returns a new instance of Link.



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# File 'lib/cf_sim/link.rb', line 4

def initialize(source_point, destination_point)
  raise 'Cannot link to same point' if source_point == destination_point
  @source_point = source_point
  @destination_point = destination_point
end

Instance Attribute Details

#destination_point ⇒ Object (readonly)

Returns the value of attribute destination_point.



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# File 'lib/cf_sim/link.rb', line 2

def destination_point
  @destination_point
end

#source_point ⇒ Object (readonly)

Returns the value of attribute source_point.



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# File 'lib/cf_sim/link.rb', line 2

def source_point
  @source_point
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/cf_sim/link.rb', line 14

def ==(other)
  eql?(other)
end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cf_sim/link.rb', line 18

def eql?(other)
  (source_point == other.source_point && destination_point == other.destination_point) ||
    (source_point == other.destination_point && destination_point == other.source_point)
end

#hash ⇒ Object 



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# File 'lib/cf_sim/link.rb', line 23

def hash
  source_point.hash + destination_point.hash
end

#intersected?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cf_sim/link.rb', line 27

def intersected?(other)
  ta = (other.source_point.x - other.destination_point.x) * (source_point.y - other.source_point.y) + (other.source_point.y - other.destination_point.y) * (other.source_point.x - source_point.x)
  tb = (other.source_point.x - other.destination_point.x) * (destination_point.y - other.source_point.y) + (other.source_point.y - other.destination_point.y) * (other.source_point.x - destination_point.x)
  tc = (source_point.x - destination_point.x) * (other.source_point.y - source_point.y) + (source_point.y - destination_point.y) * (source_point.x - other.source_point.x)
  td = (source_point.x - destination_point.x) * (other.destination_point.y - source_point.y) + (source_point.y - destination_point.y) * (source_point.x - other.destination_point.x)
  tc * td < 0 && ta * tb < 0
end

#length ⇒ Object 



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# File 'lib/cf_sim/link.rb', line 10

def length
  @length ||= Math.sqrt((source_point.x - destination_point.x) ** 2 + (source_point.y - destination_point.y) ** 2)
end

#to_s ⇒ Object 



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# File 'lib/cf_sim/link.rb', line 35

def to_s
  "#{source_point}->#{destination_point}"
end