Class: Spreet::Coordinates

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

Overview

This class permit to manipulate coordinates in a table

Constant Summary collapse

X_BIT_SHIFT =

Limit coordinates x and y in 0..65535 but coordinates are in one integer of 32 bits

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Y_FILTER =

2²⁰ rows = 1_048_576, 2¹² cols = 4_096,

((1 << X_BIT_SHIFT) - 1).freeze
BASE_26_BEF = 
"0123456789abcdefghijklmnop"
BASE_26_AFT = 
"abcdefghijklmnopqrstuvwxyz"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Coordinates

Returns a new instance of Coordinates.



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# File 'lib/spreet/coordinates.rb', line 15

def initialize(*args)
  value = (args.size == 1 ? args[0] : args)
  @x, @y = 0, 0
  if value.is_a? String
    if value.downcase.match(/^[a-z]+[0-9]+$/)
      value = value.downcase.split(/([A-Z]+|[0-9]+)/).delete_if{|x| x.size.zero?}
      @x, @y = value[0].tr(BASE_26_AFT, BASE_26_BEF).to_i(26), value[1].to_i(10)-1
    elsif value.downcase.match(/^[0-9]+[^0-9]+[0-9]+$/)
      value = value.downcase.split(/[^0-9]+/)
      @x, @y = value[0].to_i(10), value[1].to_i(10)
    end
  elsif value.is_a? Integer
    @x, @y = (value >> X_BIT_SHIFT), value & Y_FILTER
  elsif value.is_a? Coordinates
    @x, @y = value.x, value.y
  elsif value.is_a? Array
    @x, @y = value[0].to_i, value[1].to_i
  elsif value.is_a? Hash
    @x, @y = value[:x] || value[:column] || 0, value[:y] || value[:row] || 0
  end
end

Instance Attribute Details

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/spreet/coordinates.rb', line 14

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/spreet/coordinates.rb', line 14

def y
  @y
end

Instance Method Details

#<=>(other_coordinate) ⇒ Object 



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# File 'lib/spreet/coordinates.rb', line 57

def <=>(other_coordinate)
  self.to_i <=> other_coordinate.to_i
end

#==(other_coordinate) ⇒ Object 



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# File 'lib/spreet/coordinates.rb', line 53

def ==(other_coordinate)
  other_coordinate.x == self.x and other_coordinate.y == self.y
end

#to_a ⇒ Object 



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# File 'lib/spreet/coordinates.rb', line 41

def to_a
  [@x, @y]
end

#to_hash ⇒ Object 



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# File 'lib/spreet/coordinates.rb', line 45

def to_hash
  {:x=>@x, :y=>@y}
end

#to_i ⇒ Object 



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# File 'lib/spreet/coordinates.rb', line 49

def to_i
  (@x << X_BIT_SHIFT) + @y
end

#to_s ⇒ Object 



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# File 'lib/spreet/coordinates.rb', line 37

def to_s
  @x.to_s(26).tr(BASE_26_BEF, BASE_26_AFT).upcase+(@y+1).to_s(10)
end