Class: BritishSuntimes

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(year = Date.today.year.to_s, location: 'edinburgh', debug: false) ⇒ BritishSuntimes

Returns a new instance of BritishSuntimes.



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# File 'lib/british_suntimes.rb', line 18

def initialize(year=Date.today.year.to_s, location: 'edinburgh', 
               debug: false)
  
  @debug = debug

  a = (Date.parse(year + ' Jan')...Date.parse(year.succ + ' Jan')).to_a
  g = Geocoder.search(location)

  puts 'finding the times ...' if @debug
  times = a.inject({}) do |r, date|

    calc = SolarEventCalculator.new(date, *g[0].coordinates)

    a2 = %w(sunrise sunset).map do |event|
      calc.method('compute_utc_official_'.+(event).to_sym).call\
        .strftime("%H:%M")
    end

    r.merge(date.strftime("%d %b") => a2)
  end

  # alter the times for British summertime

  @bst_start = ChronicCron.new('last sunday in March at 1am', 
        Time.local(year)).to_date
  @bst_end = ChronicCron.new('last sunday in October at 2am', 
        Time.local(year)).to_date


  (@bst_start...@bst_end).to_a.each do |d|
    t1, t2 = times[d.strftime("%d %b")].map {|x| Time.parse(x)}
    t1 += 60 * 60; t2 += 60 * 60
    times[d.strftime("%d %b")] = [t1.strftime("%H:%M"), t2.strftime("%H:%M")]
  end

  @year, @location, @to_h = year, location, times
  puts 'buklding @to_dx' if @debug
  @to_dx = build_dx()    
  
end

Instance Attribute Details

#bst_end ⇒ Object (readonly)

Returns the value of attribute bst_end.



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# File 'lib/british_suntimes.rb', line 15

def bst_end
  @bst_end
end

#bst_start ⇒ Object (readonly)

Returns the value of attribute bst_start.



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# File 'lib/british_suntimes.rb', line 15

def bst_start
  @bst_start
end

#longest_day ⇒ Object (readonly)

Returns the value of attribute longest_day.



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# File 'lib/british_suntimes.rb', line 15

def longest_day
  @longest_day
end

#shortest_day ⇒ Object (readonly)

Returns the value of attribute shortest_day.



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# File 'lib/british_suntimes.rb', line 15

def shortest_day
  @shortest_day
end

#to_dx ⇒ Object (readonly)

Returns the value of attribute to_dx.



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# File 'lib/british_suntimes.rb', line 15

def to_dx
  @to_dx
end

#to_h ⇒ Object (readonly)

Returns the value of attribute to_h.



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# File 'lib/british_suntimes.rb', line 15

def to_h
  @to_h
end

Instance Method Details

#export(filename = @location + "-suntimes-#{@year}.txt") ⇒ Object

exports the sun times to a raw Dynarex file



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# File 'lib/british_suntimes.rb', line 61

def export(filename=@location + "-suntimes-#{@year}.txt")
  File.write filename, @to_dx.to_s
end