319 lines
10 KiB
JavaScript
319 lines
10 KiB
JavaScript
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// provide regional forecast and regional observations on a map
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// this is a two stage process because the data is shared between both
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// and allows for three instances of RegionalForecast to use the same data
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/* globals utils, _StationInfo, _RegionalCities */
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// a shared global object is used to handle the data for all instances of regional weather
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// eslint-disable-next-line no-unused-vars
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const RegionalForecastData = (() => {
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let dataPromise;
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let lastWeatherParameters;
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// update the data by providing weatherParamaters
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const updateData = (weatherParameters) => {
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// test for new data comparing weather paramaters
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if (utils.object.shallowEqual(lastWeatherParameters, weatherParameters)) return dataPromise;
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// update the promise by calling get data
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lastWeatherParameters = weatherParameters;
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dataPromise = getData(weatherParameters);
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return dataPromise;
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};
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// return an array of cities each containing an array of 3 weather paramaters 0 = current observation, 1,2 = next forecast periods
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const getData = async (weatherParameters) => {
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// map offset
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const offsetXY = {
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x: 240,
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y: 117,
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};
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// get user's location in x/y
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const sourceXY = getXYFromLatitudeLongitude(weatherParameters.latitude, weatherParameters.longitude, offsetXY.x, offsetXY.y, weatherParameters.state);
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// get latitude and longitude limits
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const minMaxLatLon = getMinMaxLatitudeLongitude(sourceXY.x, sourceXY.y, offsetXY.x, offsetXY.y, weatherParameters.state);
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// get a target distance
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let targetDistance = 2.5;
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if (weatherParameters.State === 'HI') targetDistance = 1;
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// make station info into an array
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const stationInfoArray = Object.keys(_StationInfo).map(key => Object.assign({}, _StationInfo[key], {Name: _StationInfo[key].City, targetDistance}));
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// combine regional cities with station info for additional stations
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// stations are intentionally after cities to allow cities priority when drawing the map
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const combinedCities = [..._RegionalCities, ...stationInfoArray];
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// Determine which cities are within the max/min latitude/longitude.
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const regionalCities = [];
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combinedCities.forEach(city => {
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if (city.Latitude > minMaxLatLon.minLat && city.Latitude < minMaxLatLon.maxLat &&
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city.Longitude > minMaxLatLon.minLon && city.Longitude < minMaxLatLon.maxLon - 1) {
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// default to 1 for cities loaded from _RegionalCities, use value calculate above for remaining stations
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const targetDistance = city.targetDistance || 1;
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// Only add the city as long as it isn't within set distance degree of any other city already in the array.
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const okToAddCity = regionalCities.reduce((acc, testCity) => {
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const distance = utils.calc.distance(city.Longitude, city.Latitude, testCity.Longitude, testCity.Latitude);
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return acc && distance >= targetDistance;
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}, true);
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if (okToAddCity) regionalCities.push(city);
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}
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});
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// get regional forecasts and observations (the two are intertwined due to the design of api.weather.gov)
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const regionalForecastPromises = regionalCities.map(async city => {
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try {
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// get the point first, then break down into forecast and observations
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const point = await utils.weather.getPoint(city.Latitude, city.Longitude);
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// start off the observation task
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const observationPromise = getRegionalObservation(point, city);
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const forecast = await $.ajax({
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url: point.properties.forecast,
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dataType: 'json',
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crossDomain: true,
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});
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// get XY on map for city
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const cityXY = getXYForCity(city, minMaxLatLon.maxLat, minMaxLatLon.minLon, weatherParameters.state);
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// wait for the regional observation if it's not done yet
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const observation = await observationPromise;
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// format the observation the same as the forecast
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const regionalObservation = {
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daytime: !!observation.icon.match(/\/day\//),
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temperature: utils.units.celsiusToFahrenheit(observation.temperature.value),
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name: city.Name,
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icon: observation.icon,
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x: cityXY.x,
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y: cityXY.y,
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};
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// return a pared-down forecast
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// 0th object is the current conditions
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// first object is the next period i.e. if it's daytime then it's the "tonight" forecast
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// second object is the following period
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// always skip the first forecast index because it's what's going on right now
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return [
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regionalObservation,
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buildForecast(forecast.properties.periods[1], city, cityXY),
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buildForecast(forecast.properties.periods[2], city, cityXY),
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];
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} catch (e) {
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console.log(`No regional forecast data for '${city.Name}'`);
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console.error(e);
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return false;
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}
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});
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// wait for the forecasts
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const regionalDataAll = await Promise.all(regionalForecastPromises);
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// filter out any false (unavailable data)
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const regionalData = regionalDataAll.filter(data => data);
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// return the weather data and offsets
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return {
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regionalData,
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offsetXY,
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sourceXY,
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};
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};
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const buildForecast = (forecast, city, cityXY) => ({
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daytime: forecast.isDaytime,
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temperature: forecast.temperature||0,
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name: city.Name,
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icon: forecast.icon,
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x: cityXY.x,
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y: cityXY.y,
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});
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const getRegionalObservation = async (point, city) => {
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try {
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// get stations
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const stations = await $.ajax({
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type: 'GET',
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url: point.properties.observationStations,
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dataType: 'json',
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crossDomain: true,
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});
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// get the first station
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const station = stations.features[0].id;
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// get the observation data
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const observation = await $.ajax({
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type: 'GET',
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url: `${station}/observations/latest`,
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dataType: 'json',
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crossDomain: true,
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});
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// return the observation
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return observation.properties;
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} catch (e) {
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console.log(`Unable to get regional observations for ${city.Name}`);
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console.error(e);
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return false;
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}
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};
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// return the data promise so everyone gets the same thing at the same time
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const getDataPromise = () => dataPromise;
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// utility latitude/pixel conversions
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const getXYFromLatitudeLongitude = (Latitude, Longitude, OffsetX, OffsetY, state) => {
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if (state === 'AK') return getXYFromLatitudeLongitudeAK(...arguments);
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if (state === 'HI') return getXYFromLatitudeLongitudeHI(...arguments);
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let y = 0;
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let x = 0;
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const ImgHeight = 1600;
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const ImgWidth = 2550;
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y = (50.5 - Latitude) * 55.2;
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y -= OffsetY; // Centers map.
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// Do not allow the map to exceed the max/min coordinates.
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if (y > (ImgHeight - (OffsetY * 2))) {
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y = ImgHeight - (OffsetY * 2);
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} else if (y < 0) {
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y = 0;
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}
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x = ((-127.5 - Longitude) * 41.775) * -1;
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x -= OffsetX; // Centers map.
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// Do not allow the map to exceed the max/min coordinates.
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if (x > (ImgWidth - (OffsetX * 2))) {
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x = ImgWidth - (OffsetX * 2);
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} else if (x < 0) {
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x = 0;
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}
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return { x, y };
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};
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const getXYFromLatitudeLongitudeAK = (Latitude, Longitude, OffsetX, OffsetY) => {
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let y = 0;
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let x = 0;
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const ImgHeight = 1142;
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const ImgWidth = 1200;
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y = (73.0 - Latitude) * 56;
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y -= OffsetY; // Centers map.
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// Do not allow the map to exceed the max/min coordinates.
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if (y > (ImgHeight - (OffsetY * 2))) {
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y = ImgHeight - (OffsetY * 2);
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} else if (y < 0) {
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y = 0;
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}
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x = ((-175.0 - Longitude) * 25.0) * -1;
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x -= OffsetX; // Centers map.
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// Do not allow the map to exceed the max/min coordinates.
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if (x > (ImgWidth - (OffsetX * 2))) {
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x = ImgWidth - (OffsetX * 2);
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} else if (x < 0) {
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x = 0;
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}
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return { x, y };
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};
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const getXYFromLatitudeLongitudeHI = (Latitude, Longitude, OffsetX, OffsetY) => {
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let y = 0;
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let x = 0;
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const ImgHeight = 571;
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const ImgWidth = 600;
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y = (25 - Latitude) * 55.2;
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y -= OffsetY; // Centers map.
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// Do not allow the map to exceed the max/min coordinates.
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if (y > (ImgHeight - (OffsetY * 2))) {
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y = ImgHeight - (OffsetY * 2);
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} else if (y < 0) {
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y = 0;
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}
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x = ((-164.5 - Longitude) * 41.775) * -1;
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x -= OffsetX; // Centers map.
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// Do not allow the map to exceed the max/min coordinates.
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if (x > (ImgWidth - (OffsetX * 2))) {
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x = ImgWidth - (OffsetX * 2);
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} else if (x < 0) {
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x = 0;
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}
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return { x, y };
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};
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const getMinMaxLatitudeLongitude = function (X, Y, OffsetX, OffsetY, state) {
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if (state === 'AK') return getMinMaxLatitudeLongitudeAK(...arguments);
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if (state === 'HI') return getMinMaxLatitudeLongitudeHI(...arguments);
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const maxLat = ((Y / 55.2) - 50.5) * -1;
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const minLat = (((Y + (OffsetY * 2)) / 55.2) - 50.5) * -1;
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const minLon = (((X * -1) / 41.775) + 127.5) * -1;
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const maxLon = ((((X + (OffsetX * 2)) * -1) / 41.775) + 127.5) * -1;
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return { minLat, maxLat, minLon, maxLon };
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};
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const getMinMaxLatitudeLongitudeAK = (X, Y, OffsetX, OffsetY) => {
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const maxLat = ((Y / 56) - 73.0) * -1;
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const minLat = (((Y + (OffsetY * 2)) / 56) - 73.0) * -1;
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const minLon = (((X * -1) / 25) + 175.0) * -1;
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const maxLon = ((((X + (OffsetX * 2)) * -1) / 25) + 175.0) * -1;
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return { minLat, maxLat, minLon, maxLon };
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};
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const getMinMaxLatitudeLongitudeHI = (X, Y, OffsetX, OffsetY) => {
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const maxLat = ((Y / 55.2) - 25) * -1;
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const minLat = (((Y + (OffsetY * 2)) / 55.2) - 25) * -1;
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const minLon = (((X * -1) / 41.775) + 164.5) * -1;
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const maxLon = ((((X + (OffsetX * 2)) * -1) / 41.775) + 164.5) * -1;
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return { minLat, maxLat, minLon, maxLon };
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};
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const getXYForCity = (City, MaxLatitude, MinLongitude, state) => {
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if (state === 'AK') getXYForCityAK(...arguments);
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if (state === 'HI') getXYForCityHI(...arguments);
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let x = (City.Longitude - MinLongitude) * 57;
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let y = (MaxLatitude - City.Latitude) * 70;
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if (y < 30) y = 30;
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if (y > 282) y = 282;
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if (x < 40) x = 40;
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if (x > 580) x = 580;
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return { x, y };
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};
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const getXYForCityAK = (City, MaxLatitude, MinLongitude) => {
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let x = (City.Longitude - MinLongitude) * 37;
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let y = (MaxLatitude - City.Latitude) * 70;
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if (y < 30) y = 30;
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if (y > 282) y = 282;
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if (x < 40) x = 40;
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if (x > 580) x = 580;
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return { x, y };
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};
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const getXYForCityHI = (City, MaxLatitude, MinLongitude) => {
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let x = (City.Longitude - MinLongitude) * 57;
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let y = (MaxLatitude - City.Latitude) * 70;
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if (y < 30) y = 30;
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if (y > 282) y = 282;
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if (x < 40) x = 40;
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if (x > 580) x = 580;
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return { x, y };
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};
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return {
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updateData,
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getDataPromise,
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};
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})();
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