Added the Gruff library to the lib/ directory of the the rails folder, and the

[selectricity-live] / lib / gruff-0.2.8 / lib / gruff / bar_conversion.rb

diff --git a/lib/gruff-0.2.8/lib/gruff/bar_conversion.rb b/lib/gruff-0.2.8/lib/gruff/bar_conversion.rb
new file mode 100644 (file)
index 0000000..880daca
--- /dev/null
+++ b/lib/gruff-0.2.8/lib/gruff/bar_conversion.rb
@@ -0,0 +1,46 @@
+##
+# 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 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     
+
+end