Class: Natour::MapGeoAdmin::MapServlet

Inherits:
WEBrick::HTTPServlet::AbstractServlet
  • Object
show all
Defined in:
lib/natour/map_geo_admin.rb

Instance Method Summary collapse

Instance Method Details

#do_GET(request, response) ⇒ Object

rubocop:disable Naming/MethodName

Raises:

  • (WEBrick::HTTPStatus::NotFound) 


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# File 'lib/natour/map_geo_admin.rb', line 82

def do_GET(request, response) # rubocop:disable Naming/MethodName
  raise WEBrick::HTTPStatus::NotFound unless request.path == '/map'

  files = request.query.fetch('gps-files', '').split(',')
  colors = request.query.fetch('gps-colors', '').split(',')
  (files.size - colors.size).times { colors << (colors.last || 'blueviolet') }
  layers = ['ch.swisstopo.pixelkarte-farbe']
  layers |= request.query.fetch('map-layers', '').split(',')

  width, height = request.query.fetch('map-size', '').split(',')
  raise WEBrick::HTTPStatus::BadRequest unless width && height

  doc = []
  doc << '<html><head>'
  doc << '<link rel="icon" href="data:;base64,iVBORw0KGgo=">'
  doc << '<script src="js/jquery-3.5.1.slim.min.js"></script>'
  doc << '<script src="js/bootstrap.min.js"></script>'
  doc << '<script src="js/loader.js"></script>'
  doc << '<script type="text/javascript">'
  doc << '  $(function() {'
  doc << '    let map = new ga.Map({'
  doc << '      controls: [],'
  doc << '      target: "map",'
  doc << '      view: new ol.View()'
  doc << '    })'
  doc << "    let layers = [#{layers.map { |layer| "\"#{layer}\"" }.join(', ')}]"
  doc << '    layers.forEach(function(layer) {'
  doc << '      map.addLayer(ga.layer.create(layer))'
  doc << '    })'
  doc << '    let getStyles = function(color) {'
  doc << '      return {'
  doc << '        "Point": new ol.style.Style({'
  doc << '          image: new ol.style.Circle({'
  doc << '            fill: new ol.style.Fill({'
  doc << '              color: function() {'
  doc << '                let [r, g, b, a] = ol.color.asArray(color)'
  doc << '                a = 0.3'
  doc << '                return ol.color.asString([r, g, b, a])'
  doc << '              }()'
  doc << '            }),'
  doc << '            radius: 6,'
  doc << '            stroke: new ol.style.Stroke({'
  doc << '              color: color,'
  doc << '              width: 1.5'
  doc << '            })'
  doc << '          })'
  doc << '        }),'
  doc << '        "LineString": new ol.style.Style({'
  doc << '          stroke: new ol.style.Stroke({'
  doc << '            color: color,'
  doc << '            width: 3'
  doc << '          })'
  doc << '        }),'
  doc << '        "MultiLineString": new ol.style.Style({'
  doc << '          stroke: new ol.style.Stroke({'
  doc << '            color: color,'
  doc << '            width: 3'
  doc << '          })'
  doc << '        })'
  doc << '      }'
  doc << '    }'
  doc << "    let sources = [#{files.zip(colors)
                                    .map { |file, color| "{ file: \"#{file}\", color: \"#{color}\" }" }
                                    .join(', ')}]"
  doc << '    let vectors = sources.map(function(source) {'
  doc << '      return new ol.layer.Vector({'
  doc << '        source: new ol.source.Vector({'
  doc << '          format: function() {'
  doc << '            if (source.file.endsWith(".gpx")) {'
  doc << '              return new ol.format.GPX()'
  doc << '            } else if (source.file.endsWith(".kml")) {'
  doc << '              return new ol.format.KML({'
  doc << '                extractStyles: false'
  doc << '              })'
  doc << '            } else {'
  doc << '              return null'
  doc << '            }'
  doc << '          }(),'
  doc << '          url: source.file'
  doc << '        }),'
  doc << '        style: function(feature) {'
  doc << '          return getStyles(source.color)[feature.getGeometry().getType()]'
  doc << '        }'
  doc << '      })'
  doc << '    })'
  doc << '    vectors.forEach(function(vector) {'
  doc << '      map.addLayer(vector)'
  doc << '      vector.getSource().on("change", function(evt) {'
  doc << '        let extent = ol.extent.createEmpty()'
  doc << '        vectors.forEach(function(vector) {'
  doc << '          ol.extent.extend(extent, vector.getSource().getExtent())'
  doc << '        })'
  doc << '        map.getView().fit(extent, map.getSize())'
  doc << '      })'
  doc << '    })'
  doc << '  })'
  doc << '</script>'
  doc << '<style type="text/css">'
  doc << '  .map {'
  doc << "    width: #{width};"
  doc << "    height: #{height};"
  doc << '  }'
  doc << '</style>'
  doc << '</head><body><div id="map" class="map"></div></body></html>'
  response.body = doc.join("\n")
  response['Content-Type'] = 'text/html'
end