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# frozen_string_literal: true
##
# Original Author: David Stokar
#
# This class performs the y coordinates 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
#
# @private
class Gruff::BarConversion
def initialize(top:, bottom:, minimum_value:, maximum_value:, spread:)
@graph_top = top
@graph_height = bottom - top
@spread = spread
@minimum_value = minimum_value
@maximum_value = maximum_value
if minimum_value >= 0
# all bars go from zero to positive
@mode = 1
elsif maximum_value <= 0
# all bars go from 0 to negative
@mode = 2
else
# bars either go from zero to negative or to positive
@mode = 3
@zero = -minimum_value / @spread
end
end
def get_top_bottom_scaled(data_point)
data_point = data_point.to_f
result = []
case @mode
when 1
# minimum value >= 0 ( only positive values )
result[0] = @graph_top + (@graph_height * (1 - data_point))
result[1] = @graph_top + @graph_height
when 2
# only negative values
result[0] = @graph_top
result[1] = @graph_top + (@graph_height * (1 - data_point))
when 3
# positive and negative values
val = data_point - (@minimum_value / @spread)
result[0] = @graph_top + (@graph_height * (1 - (val - @zero)))
result[1] = @graph_top + (@graph_height * (1 - @zero))
end
result
end
end
Version data entries
16 entries across 16 versions & 1 rubygems