minicomic-backend/classes/Filter.rb

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2009-05-22 13:36:08 +00:00
require 'singleton'
class Filter
include Singleton
@config = {}
@cleanup = []
attr_accessor :config, :cleanup
def initialize
@config = {}
@cleanup = []
end
def cleanup
@cleanup.each do |f|
if File.exists? f; File.unlink(f); end
end
end
def recalc_pixels
if @config['print']
if !@config['dpi']; raise "DPI not defined"; end
if (@config['dpi'].to_i.to_s) != @config['dpi'].to_s; raise "DPI not integer"; end
if @config['width_inches'] && (@config['width_inches'].to_f != 0)
@config['width'] = (@config['width_inches'].to_f * @config['dpi'].to_f).to_i
else
@config.delete('width')
end
if @config['height_inches'] && (@config['height_inches'].to_f != 0)
@config['height'] = (@config['height_inches'].to_f * @config['dpi'].to_f).to_i
else
@config.delete('height')
end
if (!@config['width'] && !@config['height'])
raise "No dimensions defined!"
end
end
end
#
# Set the config
#
def config=(c)
@config = c
recalc_pixels
end
#
# Build a temporary PNG from an SVG file
#
def inkscape(input, target)
params = []
width = @config['width']
height = @config['height']
inkscape_target = target
if @config['rotate']
case @config['rotate']
when 90, -90
t = width; width = height; height = t
inkscape_target = target + "-pre.png"
end
end
if width && (width.to_i != 0); params << "-w #{width} "; end
if height && (height.to_i != 0); params << "-h #{height} "; end
system("inkscape -e \"#{inkscape_target}\" -y 1.0 #{params.join(" ")} \"#{input}\"")
if @config['rotate']
command = [
"\"#{inkscape_target}\"",
"-rotate #{@config['rotate']}",
"\"#{target}\""
]
convert(command)
File.unlink(inkscape_target)
end
end
def convert(command, verbose = false)
system("convert " + (verbose ? "-verbose " : "" ) + [ command ].flatten.join(" "))
end
#
# Get the dimensions of a file
#
def get_dimensions(input)
dimensions = nil
IO.popen("identify -format '%w,%h' \"#{input}\"") do |fh|
dimensions = fh.readlines.first.split(",").collect { |d| d.to_i }
end
dimensions
end
end