Class: EPC::VerticalBar

Inherits:
Object show all
Defined in:
lib/epc/vertical_bar.rb

Constant Summary collapse

WIDTH = 
80
HEIGHT = 
16

Instance Method Summary collapse

Constructor Details

#initialize(array) ⇒ VerticalBar

Returns a new instance of VerticalBar.



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# File 'lib/epc/vertical_bar.rb', line 8

def initialize(array)
  @values = array
end

Instance Method Details



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# File 'lib/epc/vertical_bar.rb', line 12

def print
  content = ""
  return result unless @values && !@values.empty?

  # adjust X axis for WIDTH cols
  if @values.length > WIDTH
    old_values = @values
    @values = []
    0.upto(WIDTH - 1) {|i| @values << old_values[i * old_values.length / WIDTH]}
  end
  min = @values.inject {|min,ea| ea.nil? ? min : (min < ea ? min : ea)} # can't use @values.min - may contain nils
  max = @values.inject {|max,ea| ea.nil? ? max : (max > ea ? max : ea)} # can't use @values.max - may contain nils
  spread = [max - min, 1].max

  display = Array.new(HEIGHT).collect { Array.new(WIDTH, ' ') } # initialize display with blanks
  @values.each_with_index do |e, i|
    if e
      num = (e - min) * HEIGHT / spread
      (HEIGHT - 1).downto(HEIGHT - 1 - num) {|j| display[j][i] = '^'}
    else
      display[HEIGHT - 1][i] = '_'
    end
  end
  display.each {|ar| ar.each {|e| content << e}; content << "\n"}
  content
end