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@@ -107,11 +107,9 @@ module Prawn
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         @row_colors = ["ffffff","cccccc"] if @row_colors == :pdf_writer
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-        @original_row_colors = @row_colors.dup if @row_colors
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-        calculate_column_widths
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-        (options[:widths] || {}).each do |index,width| 
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-          @col_widths[index] = width
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-        end
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+        @original_row_colors = @row_colors.dup if @row_colors  
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+        
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+        calculate_column_widths(options[:widths])
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       end
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       # Width of the table in PDF points
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@@ -142,8 +140,8 @@ module Prawn
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       private
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-      def calculate_column_widths
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-        @col_widths = [0] * @data[0].length
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+      def calculate_column_widths(manual_widths=nil)
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+        @col_widths = [0] * @data[0].length    
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         renderable_data.each do |row|
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           row.each_with_index do |cell,i|
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             length = cell.lines.map { |e| 
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@@ -151,7 +149,10 @@ module Prawn
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                 2*@horizontal_padding
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             @col_widths[i] = length if length > @col_widths[i]
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           end
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-        end
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+        end  
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+        
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+        # TODO: Could optimize here
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+        manual_widths.each { |k,v| @col_widths[k] = v } if manual_widths           
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       end
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       def renderable_data

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@@ -93,11 +93,11 @@ module Prawn
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           scale = font_size / 1000.0
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           if options[:kerning]
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-            kern(string).inject(0) do |s,r|
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+            kern(string).inject(0) do |s,r|   
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               if r.is_a? String
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                 s + string_width(r, font_size, :kerning => false)
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-              else
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-                s + (r * scale)
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+              else 
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+                s - (r * scale)
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               end
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             end
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           else

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@@ -17,10 +17,10 @@ describe "adobe font metrics" do
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   end
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   it "should kern a string" do
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-    @times.kern("To").should == ["T", -80, "o"]
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-    @times.kern("Télé").should == ["T", -70, "élé"]
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-    @times.kern("Technology").should == ["T", -70, "echnology"]
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-    @times.kern("Technology...").should == ["T", -70, "echnology", -65, "..."]
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+    @times.kern("To").should == ["T", 80, "o"]
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+    @times.kern("Télé").should == ["T", 70, "élé"]
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+    @times.kern("Technology").should == ["T", 70, "echnology"]
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+    @times.kern("Technology...").should == ["T", 70, "echnology", 65, "..."]
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   end
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 end
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@@ -41,15 +41,18 @@ describe "ttf font metrics" do
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   end
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   it "should kern a string" do
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-    @activa.kern("To").should == ["T", -186, "o"]
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+    @activa.kern("To").should == ["\0007", 186.0, "\000R"]
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     # Does activa use kerning classes here? Ruby/TTF doesn't support
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     # format 2 kerning tables, so don't bother for now.
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     # @activa.kern("Télé").should == ["T", -186, "élé"]
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-    @activa.kern("Technology").should == ["T", -186, "echnology"]
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-    @activa.kern("Technology...").should == ["T", -186, "echnology", -88, "..."]
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+    @activa.kern("Technology").should == ["\0007", 186.0, 
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+      "\000H\000F\000K\000Q\000R\000O\000R\000J\000\\"]
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+    @activa.kern("Technology...").should == ["\0007", 186.0,
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+       "\000H\000F\000K\000Q\000R\000O\000R\000J\000\\", 88.0, 
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+       "\000\021\000\021\000\021"] 
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   end
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 end
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