save_doc.rb in squib-0.0.2

- old
+ new
@@ -1,22 +1,51 @@
-module Squib
-  class Deck
-
-    def save_pdf
-      #paper is 8.5x11
-      # PDF points are 1/72 of an inch
-      raise "Not implemented yet!"
-      width = 8.5 * 72
-      height = 11 * 72
-      cc = Cairo::Context.new(Cairo::PDFSurface.new('_img/deck.pdf', width, height))
-      x = 10
-      y = 10
-      @cards.each_with_index do |card, i|
-        cc.move_to(x,y)
-        x += 825*i
-        cc.set_source(card.cairo_surface, 0, 300)
-        cc.paint
-      end
-    end
-
-  end
+module Squib
+  class Deck
+
+    # Lays out the cards in range and renders a PDF
+    #
+    # @example
+    #   save_pdf file: 'deck.pdf', margin: 75, gap: 5, trim: 37
+    #
+    # @option opts file [String] the name of the PDF file to save. 
+    # @option opts dir [String] (_output) the directory to save to. Created if it doesn't exist.
+    # @option opts margin [Integer] (75) the margin around the outside of the page
+    # @option opts gap [Integer] (0) the space in pixels between the cards 
+    # @option opts trim [Integer] (0) the space around the edge of each card to trim (e.g. to cut off the bleed margin for print-and-play)
+    # @return [nil]
+    # @api public
+    def save_pdf(opts = {})
+      p = needs(opts, [:file_to_save, :creatable_dir, :margin, :gap, :trim])
+      width = 11 * @dpi ; height = 8.5 * @dpi #TODO: allow this to be specified too
+      cc = Cairo::Context.new(Cairo::PDFSurface.new("#{p[:dir]}/#{p[:file]}", width, height))
+      x = p[:margin] ; y = p[:margin]
+      @cards.each_with_index do |card, i|
+        surface = trim(card.cairo_surface, p[:trim], @width, @height)
+        cc.set_source(surface, x, y)
+        cc.paint
+        x += surface.width + p[:gap]
+        if x > (width - surface.width - p[:margin])
+          x = p[:margin]
+          y += surface.height + p[:gap]
+          if y > (height - surface.height - p[:margin])
+            x = p[:margin] ; y = p[:margin]
+            cc.show_page #next page
+          end
+        end
+      end
+    end
+
+    # :nodoc:
+    # @api private 
+    def trim(surface, trim, width, height)
+      if trim > 0
+        tmp = Cairo::ImageSurface.new(width-2*trim, height-2*trim)
+        cc = Cairo::Context.new(tmp)
+        cc.set_source(surface,-1*trim, -1*trim)
+        cc.paint
+        surface = tmp
+      end
+      surface
+    end
+
+  end
 end
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