Class: MapPrint::GeoJSONHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/map_print/geo_json_handler.rb

Instance Method Summary collapse

Constructor Details

#initialize(geojson, sw, ne, width, height) ⇒ GeoJSONHandler

Returns a new instance of GeoJSONHandler.



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# File 'lib/map_print/geo_json_handler.rb', line 5

def initialize(geojson, sw, ne, width, height)
  @top_lat = ne[:lat]
  @total_lat = (ne[:lat] - sw[:lat])
  @left_lng = sw[:lng]
  @total_lng = (ne[:lng] - sw[:lng])
  @height = height
  @width = width
  @geojson = JSON[geojson]
rescue JSON::GeneratorError, JSON::ParserError
  raise InvalidGeoJSON.new("Invalid GeoJSON: #{geojson.inspect}")
end

Instance Method Details

#process ⇒ Object 



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# File 'lib/map_print/geo_json_handler.rb', line 17

def process
  tempfile = Tempfile.new ['geojson', '.png']
  `convert -density 300 -size #{@width}x#{@height} xc:transparent #{tempfile.path}`
  @image = MiniMagick::Image.new tempfile.path

  draw_geojson

  @image.write(tempfile.path)
  MiniMagick::Image.open(tempfile.path)
ensure
  tempfile.close
end