PDF support more stable now

* Lays out cards with possiblity of margin, gap, and trim
* Some new directory and file validation
* Added a logger

lib/squib.rb

@@ -1,2 +1,14 @@
+require 'logger'
+
+module Squib
+
+  def logger
+    @logger ||= Logger.new(STDOUT)   
+  end
+  module_function :logger
+
+end
+
 require 'squib/deck'
 require 'squib/card'
+

lib/squib/deck.rb

@@ -13,6 +13,7 @@ module Squib
 
     def initialize(width: 825, height: 1125, cards: 1, &block)
       @width=width; @height=height
+      @dpi = 300
       @font = 'Sans 36'
       @cards = []
       cards.times{ @cards << Squib::Card.new(self, width, height) }

lib/squib/graphics/save_doc.rb

@@ -1,22 +1,37 @@
 module Squib
   class Deck
 
-    def save_pdf
+    def save_pdf(file: 'deck.pdf', dir: '_output', margin: 75, gap: 0, trim: 0)
-      #paper is 8.5x11
+      dir = dirify(dir, allow_create: true)
-      # PDF points are 1/72 of an inch
+      width = 11 * @dpi ; height = 8.5 * @dpi #TODO: allow this to be specified too
-      raise "Not implemented yet!"
+      cc = Cairo::Context.new(Cairo::PDFSurface.new("#{dir}/#{file}", width, height))
-      width = 8.5 * 72
+      x = margin ; y = margin
-      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)
+        surface = trim(card.cairo_surface, trim, @width, @height)
-        x += 825*i
+        cc.set_source(surface, x, y)
-        cc.set_source(card.cairo_surface, 0, 300)
         cc.paint
+        x += surface.width + gap
+        if x > (width - surface.width - margin)
+          x = margin 
+          y += surface.height + gap
+          if y > (height - surface.height - margin)
+            x = margin ; y = margin
+            cc.show_page #next page
+          end
+        end
       end
     end
 
+    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

lib/squib/input_helpers.rb

@@ -13,11 +13,24 @@ module Squib
     module_function :rangeify
 
     def fileify(file)
-      raise 'File #{file} does not exist!' unless File.exists? file
+      raise "File #{File.expand_path(file)} does not exist!" unless File.exists? file
       file
     end
     module_function :fileify
 
+    def dirify(dir, allow_create: false)
+      return dir if Dir.exists? dir 
+      if allow_create
+        Squib.logger.warn "PDF output dir #{dir} does not exist... attempting to create it"
+        Dir.mkdir dir
+        return dir 
+      else
+        raise "#{dir} does not exist!"
+      end
+    end
+    module_function :dirify
+
+
     def colorify(color, nillable: false)
       if nillable # for optional color arguments like text hints
         color = Cairo::Color.parse(color) unless color.nil?

samples/save_pdf.rb

@@ -0,0 +1,16 @@
+#!/usr/bin/env ruby
+require 'squib'
+
+Squib::Deck.new(width: 825, height: 1125, cards: 16) do
+  background color: :gray
+  rect x: 38, y: 38, width: 750, height: 1050, x_radius: 38, y_radius: 38
+
+  text str: (1..16).to_a, x: 220, y: 78, font: 'Arial 54'
+
+  save_pdf file: "sample-save-pdf.pdf", margin: 75, gap: 5, trim: 37
+
+  #Note that our PNGs still are not trimmed even though the pdf ones are
+  save_png range: 1, prefix: "save_pdf_"
+end
+
+puts "Done!"