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@@ -128,13 +128,13 @@ module Quilt
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       @decode = decode @code
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       if opt[:size]
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-        @scale = (((opt[:size] / 3) - 1) / (PATCH_SIZE - 1)) + 1
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+        @scale = (opt[:size].to_f / (PATCH_SIZE * 3)).ceil
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         @resize_to = opt[:size]
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       else
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         @scale = opt[:scale] || 1
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       end
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-      @patch_width = (PATCH_SIZE - 1) * @scale + 1
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+      @patch_width = PATCH_SIZE * @scale
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       @image = @@image_lib.new @patch_width * 3, @patch_width * 3
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       @back_color = @image.color 255, 255, 255
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       @fore_color = @image.color @decode[:red], @decode[:green], @decode[:blue]
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@@ -194,22 +194,23 @@ module Quilt
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       else
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         fore, back = @fore_color, @back_color
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       end
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-      @image.fill_rect(x, y, x + @patch_width, y + @patch_width, back)
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+      @image.fill_rect(x, y, x + @patch_width - 1, y + @patch_width - 1, back)
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       points = []
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       PATCHES[patch].each do |pt|
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         dx = pt % PATCH_SIZE
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         dy = pt / PATCH_SIZE
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-        px = dx.to_f / (PATCH_SIZE - 1) * @patch_width
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-        py = dy.to_f / (PATCH_SIZE - 1) * @patch_width
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+        len = @patch_width - 1
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+        px = dx.to_f / (PATCH_SIZE - 1) * len
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+        py = dy.to_f / (PATCH_SIZE - 1) * len
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         case turn
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         when 1
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-          px, py = @patch_width - py, px
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+          px, py = len - py, px
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         when 2
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-          px, py = @patch_width - px, @patch_width - py
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+          px, py = len - px, len - py
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         when 3
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-          px, py = py, @patch_width - px
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+          px, py = py, len - px
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         end
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         points << [x + px, y + py]
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       end