Class: PrintMap::Worker

Inherits:
Object
  • Object
show all
Defined in:
lib/print_map/worker.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ Worker

Returns a new instance of Worker.



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# File 'lib/print_map/worker.rb', line 12

def initialize(config = {})
  @map_exporter = config[:map_exporter] || MapExporter.new
  @pdf_generator = config[:pdf_generator] || PdfGenerator.new
  @legend_images_collector = config[:legend_images_collector] || LegendImagesCollector.new
end

Instance Attribute Details

#current_job ⇒ Object (readonly)

Returns the value of attribute current_job.



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# File 'lib/print_map/worker.rb', line 9

def current_job
  @current_job
end

#legend_images_collector ⇒ Object (readonly)

Returns the value of attribute legend_images_collector.



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# File 'lib/print_map/worker.rb', line 10

def legend_images_collector
  @legend_images_collector
end

#map_exporter ⇒ Object (readonly)

Returns the value of attribute map_exporter.



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# File 'lib/print_map/worker.rb', line 10

def map_exporter
  @map_exporter
end

#pdf_generator ⇒ Object (readonly)

Returns the value of attribute pdf_generator.



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# File 'lib/print_map/worker.rb', line 10

def pdf_generator
  @pdf_generator
end

Instance Method Details

#collect_legend_images ⇒ Object 



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# File 'lib/print_map/worker.rb', line 62

def collect_legend_images
  images = []
  current_job.services.each do |url|
    puts 'fetching legends at ' + url
    images << legend_images_collector.collect(:url => url)
  end
  images.flatten
end

#create_composite_map_image ⇒ Object 



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# File 'lib/print_map/worker.rb', line 31

def create_composite_map_image
  width, height = 540, 510
  base_image = Magick::Image.new(width, height)
  base_image.background_color = 'transparent'
  base_image.format = 'PNG'

  current_job.services.each do |map_service|
    export_options = {
      :service => map_service,
      :dpi     => current_job.dpi,
      :bbox    => current_job.bbox.join(','),
      :size    => [width, height].join(',')
    }
    map_service_image = map_exporter.export(export_options)
    base_image.composite!(map_service_image, Magick::CenterGravity, Magick::OverCompositeOp)
    map_service_image.destroy!
  end

  base_image
end

#do_job(job) ⇒ Object 



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# File 'lib/print_map/worker.rb', line 18

def do_job(job)
  @current_job = job
  puts 'create composite map image'
  map_image  = create_composite_map_image
  puts 'collect legend images'
  legend_images = collect_legend_images
  puts 'generate pdf'
  pdf = generate_pdf(map_image, legend_images)
  puts 'cleanup'
  map_image.destroy!
  pdf
end

#generate_pdf(map_image, legend_images) ⇒ Object 



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# File 'lib/print_map/worker.rb', line 52

def generate_pdf(map_image, legend_images)
  opts = {
    :title         => current_job.title,
    :map_image     => map_image,
    :page_layout   => current_job.page_layout,
    :legend_images => legend_images
  }
  pdf_generator.generate(opts)
end