X-Git-Url: https://projects.mako.cc/source/selectricity-live/blobdiff_plain/1a62f78f4f3818ab697bddf51f80a1ba150ce9e7..131cab23209cb1dfa81930240b8cf722d2302131:/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
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+++ b/lib/gruff-0.2.8/lib/gruff/bar_conversion.rb
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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 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