lib/sparklines.rb in sparklines-0.4.4 vs lib/sparklines.rb in sparklines-0.4.5

@@ -72,11 +72,11 @@
 Licensed under the MIT license.
 
 =end
 class Sparklines
 
-  VERSION = '0.4.4'
+  VERSION = '0.4.5'
 
   @@label_margin = 5.0
   @@pointsize = 10.0
 
   class << self
@@ -461,23 +461,25 @@
 
     # step = @options[:step].to_f
     height = @options[:height].to_f
     background_color = @options[:background_color]
 
-    create_canvas((@data.size - 1) * 2, height, background_color)
+    create_canvas(@data.size * 2 - 1, height, background_color)
     
     whisker_color = @options[:whisker_color] || 'black'
     exception_color = @options[:exception_color] || 'red'
 
+    on_row = (@canvas.rows/2.0 - 1).ceil
+    off_row = (@canvas.rows/2.0).floor
     i = 0
     @data.each do |r|
       color = whisker_color
 
       if ( (r == 2 || r == -2) && exception_color )
         color = exception_color
       end
 
-      y_mid_point = (r >= 1) ? (@canvas.rows/2.0 - 1).ceil : (@canvas.rows/2.0).floor
+      y_mid_point = (r >= 1) ? on_row : off_row
 
       y_end_point = y_mid_point
       if ( r > 0) 
         y_end_point = 0
       end