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
# File lib/gruff/bar_conversion.rb, line 20 def getLeftYRightYscaled( 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 ) then 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