#!/usr/bin/env ruby

# for Adobe InDesign
# changes the page size of the document, and scales every item on every page

# edit the following:
PAGE_WIDTH  = 1024
PAGE_HEIGHT = 768 # I'm using points, coz they're the same as pixels (72ppi)
SCALE_AMT   = 2.0 # This is the scale factor, so 2.0 == 200%


require 'rubygems'
require 'appscript'
include Appscript

def set_units(to)
	@doc.view_preference.horizontal_measurement_units.set(to)
	@doc.view_preference.vertical_measurement_units.set(to)
end

@indesign = app('Adobe InDesign CS4.app')
@doc = @indesign.active_document

@original_measurement_units  = @doc.view_preference.horizontal_measurement_units.get[0]
set_units(:points)

@doc.document_preferences.page_width.set(PAGE_WIDTH)
@doc.document_preferences.page_height.set(PAGE_HEIGHT)

# make a matrix to apply during the loop
matrix = @indesign.make(:new => :transformation_matrix)
matrix = @indesign.scale_matrix(matrix, :horizontally_by => SCALE_AMT, :vertically_by => SCALE_AMT)

# loop through all the pages
for i in 1..@doc.pages.get.length
	@indesign.transform(
		@doc.pages[i].page_items(:every),
		:in => :pasteboard_coordinates,  
		:from => [[PAGE_WIDTH/2, PAGE_HEIGHT/2], :center_anchor],
		:with_matrix => matrix
	)
end

# tidy up
set_units(@original_measurement_units)