Class: Gruff::BarConversion

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

Overview

Original Author: David Stokar

This class perfoms the y coordinats conversion for the bar class.

There are three cases:

1. Bars all go from zero in positive direction

2. Bars all go from zero to negative direction 3. Bars either go from zero to positive or from zero to negative

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#graph_height=(value) ⇒ Object (writeonly)

Sets the attribute graph_height



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# File 'lib/gruff/bar_conversion.rb', line 16

def graph_height=(value)
  @graph_height = value
end

#graph_top=(value) ⇒ Object (writeonly)

Sets the attribute graph_top



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# File 'lib/gruff/bar_conversion.rb', line 15

def graph_top=(value)
  @graph_top = value
end

#minimum_value=(value) ⇒ Object (writeonly)

Sets the attribute minimum_value



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# File 'lib/gruff/bar_conversion.rb', line 17

def minimum_value=(value)
  @minimum_value = value
end

#mode=(value) ⇒ Object (writeonly)

Sets the attribute mode



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# File 'lib/gruff/bar_conversion.rb', line 13

def mode=(value)
  @mode = value
end

#spread=(value) ⇒ Object (writeonly)

Sets the attribute spread



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# File 'lib/gruff/bar_conversion.rb', line 18

def spread=(value)
  @spread = value
end

#zero=(value) ⇒ Object (writeonly)

Sets the attribute zero



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# File 'lib/gruff/bar_conversion.rb', line 14

def zero=(value)
  @zero = value
end

Instance Method Details

#get_left_y_right_y_scaled(data_point, result) ⇒ Object



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# File 'lib/gruff/bar_conversion.rb', line 20

def get_left_y_right_y_scaled(data_point, result)
  case @mode
  when 1 then # Case one
              # minimum value >= 0 ( only positiv values )
    result[0] = @graph_top + @graph_height*(1 - data_point) + 1
    result[1] = @graph_top + @graph_height - 1
  when 2 then # Case two
              # only negativ values
    result[0] = @graph_top + 1
    result[1] = @graph_top + @graph_height*(1 - data_point) - 1
  when 3 then # Case three
              # positiv and negativ values
    val = data_point-@minimum_value/@spread
    if data_point >= @zero
      result[0] = @graph_top + @graph_height*(1 - (val-@zero)) + 1
      result[1] = @graph_top + @graph_height*(1 - @zero) - 1
    else
      result[0] = @graph_top + @graph_height*(1 - (val-@zero)) + 1
      result[1] = @graph_top + @graph_height*(1 - @zero) - 1
    end
  else
    result[0] = 0.0
    result[1] = 0.0
  end
end