Server action code for this tutorial

tutorial_22_example_1_file_1.rb

  # Extract EXIF metadata from a photo on the server
  get '/tutorial_22_demo_1' do

    # load the library file that contains methods used this tutorial
    require 'lib/tutorial_22.rb'

    # Extract the metadata from an image file on the server
    @photo = MiniExiftool.new(File.join(root_dir, "/public/assets/photo_metadata_1_400.jpg"))

    # Get the Latitude and Longitude values and convert to decimal format
    @latitude_0  = dms_to_decimal(@photo['GPSLatitude'])
    @longitude_0 = dms_to_decimal(@photo['GPSLongitude'])

    # Compute a second Lat/Lon pair along the direction the image was taken - used to draw a line on the map
    bearing = @photo['GPSImgDirection'].to_f
    @latitude_1, @longitude_1 = latlong_offset(@latitude_0, @longitude_0, bearing, 0.5)

    erb :tutorial_22_demo_1
  end