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##
# 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
#
class Gruff::BarConversion
attr_writer :mode
attr_writer :zero
attr_writer :graph_top
attr_writer :graph_height
attr_writer :minimum_value
attr_writer :spread
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
end
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