Follow location

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<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
        <script crossorigin src="https://cdn.jsdelivr.net/npm/@babel/standalone@7/babel.min.js"></script>
        <script crossorigin src="https://cdn.jsdelivr.net/npm/satellite.js@5.0.0/dist/satellite.min.js"></script>
        <!-- To make the map appear, you must add your apikey -->
        <script src="https://js.api.mappable.world/v3/?apikey=<YOUR_APIKEY>&lang=en_US" type="text/javascript"></script>

        <script
            data-plugins="transform-modules-umd"
            data-presets="typescript"
            type="text/babel"
            src="../variables.ts"
        ></script>
        <script
            data-plugins="transform-modules-umd"
            data-presets="typescript"
            type="text/babel"
            src="./common.ts"
        ></script>
        <script data-plugins="transform-modules-umd" data-presets="typescript" type="text/babel">
            import {LngLat} from '@mappable-world/mappable-types/imperative';
            import {
                animateMarker,
                ANIMATION_DURATION,
                BEHAVIORS,
                getLocation,
                getSatelliteRoute,
                LOCATION,
                MARKER_IMAGE_PATH
            } from './common';
            import {LINE_STRING_STYLE} from '../variables';
            
            // Initialize global variables
            window.map = null;
            
            // Main function to initialize the application
            main();
            async function main() {
                await mappable.ready;
            
                const {MMap, MMapDefaultSchemeLayer, MMapDefaultFeaturesLayer, MMapMarker, MMapFeature} = mappable;
            
                map = new MMap(
                    document.getElementById('app'),
                    {location: LOCATION, behaviors: BEHAVIORS, showScaleInCopyrights: true},
                    [new MMapDefaultSchemeLayer({}), new MMapDefaultFeaturesLayer({})]
                );
            
                const markerElement = document.createElement('div');
                markerElement.className = 'marker-container';
                const markerImg = document.createElement('img');
                markerImg.src = MARKER_IMAGE_PATH;
                markerImg.alt = 'marker';
                markerElement.appendChild(markerImg);
            
                const marker = new MMapMarker({disableRoundCoordinates: true, coordinates: [0, 0]}, markerElement);
            
                const feature = new MMapFeature({geometry: {type: 'MultiLineString', coordinates: []}, style: LINE_STRING_STYLE});
                map.addChild(feature);
            
                let prevCoordinates: LngLat;
                await fetchData();
            
                // Set an interval to update the location periodically
                setInterval(fetchData, ANIMATION_DURATION);
            
                async function fetchData() {
                    const newCoordinates = await getLocation();
            
                    const lineCoordinates = await getSatelliteRoute();
            
                    if (!map.children.includes(marker)) {
                        marker.update({coordinates: newCoordinates});
                        map.addChild(marker);
                    }
                    if (!prevCoordinates) {
                        map.setLocation({center: newCoordinates});
                    } else {
                        animateMarker(prevCoordinates, newCoordinates, (lngLat) => {
                            map.setLocation({center: lngLat});
                            marker.update({coordinates: lngLat});
                        });
                    }
            
                    prevCoordinates = newCoordinates;
                    feature.update({geometry: {type: 'MultiLineString', coordinates: lineCoordinates}});
                }
            }
        </script>

        <style> html, body, #app { width: 100%; height: 100%; margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } .toolbar { position: absolute; z-index: 1000; top: 0; left: 0; display: flex; align-items: center; padding: 16px; } .toolbar a { padding: 16px; }  </style>
        <link rel="stylesheet" href="../variables.css" />
    </head>
    <body>
        <div id="app"></div>
    </body>
</html>

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
        <script crossorigin src="https://cdn.jsdelivr.net/npm/react@17/umd/react.production.min.js"></script>
        <script crossorigin src="https://cdn.jsdelivr.net/npm/react-dom@17/umd/react-dom.production.min.js"></script>
        <script crossorigin src="https://cdn.jsdelivr.net/npm/@babel/standalone@7/babel.min.js"></script>
        <script crossorigin src="https://cdn.jsdelivr.net/npm/satellite.js@5.0.0/dist/satellite.min.js"></script>
        <!-- To make the map appear, you must add your apikey -->
        <script src="https://js.api.mappable.world/v3/?apikey=<YOUR_APIKEY>&lang=en_US" type="text/javascript"></script>

        <script
            data-plugins="transform-modules-umd"
            data-presets="typescript"
            type="text/babel"
            src="../variables.ts"
        ></script>
        <script
            data-plugins="transform-modules-umd"
            data-presets="typescript"
            type="text/babel"
            src="./common.ts"
        ></script>
        <script data-plugins="transform-modules-umd" data-presets="react, typescript" type="text/babel">
            import {LngLat} from '@mappable-world/mappable-types';
            import {
                animateMarker,
                ANIMATION_DURATION,
                BEHAVIORS,
                getLocation,
                getSatelliteRoute,
                LOCATION,
                MARKER_IMAGE_PATH
            } from './common';
            import {LINE_STRING_STYLE} from '../variables';
            
            // Global variable to hold the map instance
            window.map = null;
            
            // Main function to initialize the application
            main();
            
            async function main() {
                // Import Mappable maps and wait for the library to be ready
                const [mappableReact] = await Promise.all([mappable.import('@mappable-world/mappable-reactify'), mappable.ready]);
            
                // Reactify Mappable maps for use with React
                const reactify = mappableReact.reactify.bindTo(React, ReactDOM);
                const {MMap, MMapDefaultSchemeLayer, MMapDefaultFeaturesLayer, MMapMarker, MMapFeature} = reactify.module(mappable);
            
                const {useState, useEffect, useRef} = React;
            
                function App() {
                    // State for current coordinates and line coordinates
                    const [location, setLocation] = useState(LOCATION);
                    const [coordinates, setCoordinates] = useState<LngLat>();
                    const [lineCoordinates, setLineCoordinates] = useState<LngLat[][]>([]);
            
                    // References for marker and previous coordinates
                    const prevCoordinatesRef = useRef<LngLat>(null);
            
                    useEffect(() => {
                        fetchData();
            
                        // Set an interval to update the location periodically
                        const updateSource = setInterval(() => {
                            fetchData();
                        }, ANIMATION_DURATION);
            
                        // Function to fetch new location and satellite route
                        async function fetchData() {
                            const newCoordinates = await getLocation(); // Fetch new coordinates
            
                            // Fetch satellite route coordinates
                            const lines = await getSatelliteRoute();
            
                            if (!prevCoordinatesRef.current) {
                                setCoordinates(newCoordinates);
                                setLocation({center: newCoordinates});
                            } else {
                                // Animate marker if previous coordinates exist
                                animateMarker(prevCoordinatesRef.current, newCoordinates, (lngLat) => {
                                    setLocation({center: lngLat});
                                    setCoordinates(lngLat);
                                });
                            }
            
                            prevCoordinatesRef.current = newCoordinates;
                            setLineCoordinates(lines); // Update line coordinates state
                        }
            
                        // Cleanup function to clear the interval when the component unmounts
                        return () => clearInterval(updateSource);
                    }, []); // Empty dependency array to run once on mount
            
                    return (
                        <MMap location={location} behaviors={BEHAVIORS} showScaleInCopyrights={true} ref={(x) => (map = x)}>
                            <MMapDefaultSchemeLayer />
                            <MMapDefaultFeaturesLayer />
                            {coordinates && (
                                <MMapMarker disableRoundCoordinates coordinates={coordinates}>
                                    <div className="marker-container">
                                        <img src={MARKER_IMAGE_PATH} alt="marker" />
                                    </div>
                                </MMapMarker>
                            )}
                            {lineCoordinates && (
                                <MMapFeature
                                    geometry={{type: 'MultiLineString', coordinates: lineCoordinates}}
                                    style={LINE_STRING_STYLE}
                                />
                            )}
                        </MMap>
                    );
                }
            
                // Render the App component inside a strict mode
                ReactDOM.render(
                    <React.StrictMode>
                        <App />
                    </React.StrictMode>,
                    document.getElementById('app')
                );
            }
        </script>

        <style> html, body, #app { width: 100%; height: 100%; margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } .toolbar { position: absolute; z-index: 1000; top: 0; left: 0; display: flex; align-items: center; padding: 16px; } .toolbar a { padding: 16px; }  </style>
        <link rel="stylesheet" href="../variables.css" />
    </head>
    <body>
        <div id="app"></div>
    </body>
</html>

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
        <script crossorigin src="https://cdn.jsdelivr.net/npm/vue@3/dist/vue.global.js"></script>
        <script crossorigin src="https://cdn.jsdelivr.net/npm/@babel/standalone@7/babel.min.js"></script>
        <script crossorigin src="https://cdn.jsdelivr.net/npm/satellite.js@5.0.0/dist/satellite.min.js"></script>
        <!-- To make the map appear, you must add your apikey -->
        <script src="https://js.api.mappable.world/v3/?apikey=<YOUR_APIKEY>&lang=en_US" type="text/javascript"></script>

        <script
            data-plugins="transform-modules-umd"
            data-presets="typescript"
            type="text/babel"
            src="../variables.ts"
        ></script>
        <script
            data-plugins="transform-modules-umd"
            data-presets="typescript"
            type="text/babel"
            src="./common.ts"
        ></script>
        <script data-plugins="transform-modules-umd" data-presets=" typescript" type="text/babel">
            import {
                animateMarker,
                ANIMATION_DURATION,
                BEHAVIORS,
                getLocation,
                getSatelliteRoute,
                LOCATION,
                MARKER_IMAGE_PATH
            } from './common';
            import {LINE_STRING_STYLE} from '../variables';
            
            window.map = null;
            
            async function main() {
                // Import the Vuefy module for Mappable Maps integration
                const [mappableVue] = await Promise.all([mappable.import('@mappable-world/mappable-vuefy'), mappable.ready]);
            
                // Bind Vuefy to the Vue instance
                const vuefy = mappableVue.vuefy.bindTo(Vue);
            
                // Destructure required components from the Vuefy module
                const {MMap, MMapDefaultSchemeLayer, MMapDefaultFeaturesLayer, MMapMarker, MMapFeature} = vuefy.module(mappable);
            
                // Create the Vue application
                const app = Vue.createApp({
                    components: {
                        MMap,
                        MMapDefaultSchemeLayer,
                        MMapDefaultFeaturesLayer,
                        MMapMarker,
                        MMapFeature
                    },
            
                    setup() {
                        // Reference to the map instance
                        const refMap = (ref) => {
                            window.map = ref?.entity;
                        };
            
                        // Reactive variables for location and coordinates
                        const location = Vue.ref(LOCATION);
                        const coordinates = Vue.ref(null);
                        const lineCoordinates = Vue.ref([]);
                        const prevCoordinates = Vue.ref(null);
                        const updateSource = Vue.ref(null);
            
                        // Lifecycle hook to fetch new coordinates on mount
                        Vue.onMounted(() => {
                            // Function to fetch new coordinates and update the map
                            // Initial data fetch
                            fetchData();
            
                            // Set an interval to update the location periodically
                            updateSource.value = setInterval(() => {
                                fetchData();
                            }, ANIMATION_DURATION);
            
                            // Function to fetch new location and satellite route
                            async function fetchData() {
                                // Fetch new coordinates from the API
                                const newCoordinates = await getLocation();
            
                                // Fetch satellite route coordinates
                                lineCoordinates.value = await getSatelliteRoute();
            
                                if (!prevCoordinates.value) {
                                    // Update current marker coordinates
                                    coordinates.value = newCoordinates;
                                    // Update the map location
                                    location.value = {center: newCoordinates};
                                } else {
                                    // Animate marker if previous coordinates exist
                                    animateMarker(prevCoordinates.value, newCoordinates, (lngLat) => {
                                        location.value = {center: lngLat};
                                        coordinates.value = lngLat;
                                    });
                                }
            
                                // Store marker coordinates as previous
                                prevCoordinates.value = newCoordinates;
                            }
                        });
            
                        Vue.onBeforeUnmount(() => {
                            clearInterval(updateSource.value);
                        });
            
                        // Return reactive variables to the template
                        return {
                            location,
                            coordinates,
                            lineCoordinates,
                            refMap,
                            MARKER_IMAGE_PATH,
                            LINE_STRING_STYLE,
                            BEHAVIORS
                        };
                    },
            
                    // Template for the Vue component
                    template: `
                        <MMap :location="location" :behaviors="BEHAVIORS" :showScaleInCopyrights="true" :ref="refMap">
                          <MMapDefaultSchemeLayer />
                          <MMapDefaultFeaturesLayer />
                          <MMapMarker v-if="coordinates" disableRoundCoordinates :coordinates="coordinates">
                            <div class="marker-container">
                              <img :src="MARKER_IMAGE_PATH" alt="marker" />
                            </div>
                          </MMapMarker>
                          <MMapFeature
                            v-if="lineCoordinates"
                            :geometry="{ type: 'MultiLineString', coordinates: lineCoordinates }"
                            :style="LINE_STRING_STYLE"
                          />
                        </MMap>`
                });
            
                // Mount the Vue application to the DOM
                app.mount('#app');
            }
            
            // Execute the main function to start the application
            main();
        </script>

        <style> html, body, #app { width: 100%; height: 100%; margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; } .toolbar { position: absolute; z-index: 1000; top: 0; left: 0; display: flex; align-items: center; padding: 16px; } .toolbar a { padding: 16px; }  </style>
        <link rel="stylesheet" href="../variables.css" />
    </head>
    <body>
        <div id="app"></div>
    </body>
</html>

import type {DrawingStyle} from '@mappable-world/mappable-types';

export const LINE_STRING_STYLE: DrawingStyle = {
    simplificationRate: 0,
    stroke: [
        {color: '#2E4CE5', width: 3, dash: [8, 14]}, // Primary stroke style
        {color: '#FFFFFF', width: 7, opacity: 0.3} // Secondary stroke style
    ]
};

.marker-container {
    position: absolute;

    display: flex;
    justify-content: center;
    align-items: center;

    box-sizing: border-box;
    min-width: 24px;
    min-height: 24px;

    border: 3px solid #fff;
    border-radius: 8px;
    background-color: #313133;
    box-shadow: 0 0 2px 0 #5f698314;

    transform: translate(-50%, -50%);
}

import type {LngLat, MMapLocationRequest, BehaviorType} from '@mappable-world/mappable-types';

export const LOCATION: MMapLocationRequest = {
    center: [0, 0], // starting position [lng, lat]
    zoom: 3 // starting zoom
};
export const BEHAVIORS: BehaviorType[] = ['scrollZoom'];

// Constants for marker image path, animation duration, and line string style
export const MARKER_IMAGE_PATH = '../icon-iss.svg';
export const ANIMATION_DURATION = 5000; // Duration for animation in milliseconds

// Function to get the satellite route
export async function getSatelliteRoute(): Promise<LngLat[][]> {
    try {
        // Fetch satellite TLE data
        const response = await fetch('https://api.wheretheiss.at/v1/satellites/25544/tles', {method: 'GET'});
        const responseJSON = await response.json();

        // Create current UTC date
        const now = new Date(
            Date.UTC(
                new Date().getUTCFullYear(),
                new Date().getUTCMonth(),
                new Date().getUTCDate(),
                new Date().getUTCHours(),
                new Date().getUTCMinutes(),
                new Date().getUTCSeconds()
            )
        );

        // Convert TLE to satellite record
        const satrec = satellite.twoline2satrec(responseJSON.line1, responseJSON.line2);
        const positions: LngLat[] = []; // Array to hold satellite positions

        // Define time duration and interval for position calculations
        const durationMilliseconds = 50 * 60 * 1000; // 45 minutes in milliseconds
        const intervalMilliseconds = 10000; // 10 seconds interval for each position

        // Calculate satellite positions over the specified duration
        for (let time = -durationMilliseconds; time <= durationMilliseconds; time += intervalMilliseconds) {
            const positionTime = new Date(now.getTime() + time);
            const positionAndVelocity = satellite.propagate(satrec, positionTime);
            const positionEci = positionAndVelocity.position;

            // Check for valid ECI position
            if (!positionEci) {
                console.error('Invalid position ECI:', positionAndVelocity);
                continue;
            }

            // Convert ECI position to geodetic coordinates
            const gmst = satellite.gstime(positionTime);
            const positionGd = satellite.eciToGeodetic(positionEci, gmst);
            positions.push([positionGd.longitude * (180 / Math.PI), positionGd.latitude * (180 / Math.PI)]);
        }

        // Split the array of positions into two parts
        const {firstPart, secondPart} = splitArray(positions);
        return [firstPart, secondPart];
    } catch (err) {
        console.error('Failed to fetch satellite route:', err);
        throw new Error('Failed to fetch satellite route');
    }
}

// Helper function to split an array into two parts based on a condition
const splitArray = (arr) => {
    let firstPart = [];
    let secondPart = [];
    let foundSplit = false;

    for (let i = 0; i < arr.length; i++) {
        // Determine where to split the array based on longitude values
        if (!foundSplit && i !== 0 && +arr[i][0] < +arr[i - 1][0]) {
            foundSplit = true;
        }
        // Push to the appropriate part based on the split condition
        if (!foundSplit) {
            firstPart.push(arr[i]);
        } else {
            secondPart.push(arr[i]);
        }
    }
    return {firstPart, secondPart};
};

// Function to animate a marker's movement from one location to another
export const animateMarker = (from: LngLat, to: LngLat, callback: (lngLat: LngLat) => void) => {
    const duration = ANIMATION_DURATION; // Duration of the animation
    const startTime = performance.now(); // Start time of the animation

    const animateStep = (currentTime) => {
        const elapsed = currentTime - startTime; // Calculate elapsed time
        const t = Math.min(elapsed / duration, 1); // Calculate interpolation factor

        // Interpolate longitude and latitude
        const interpolatedLongitude = from[0] + (to[0] - from[0]) * t;
        const interpolatedLatitude = from[1] + (to[1] - from[1]) * t;
        callback([interpolatedLongitude, interpolatedLatitude]);

        // Continue animation if not complete
        if (t < 1) {
            requestAnimationFrame(animateStep);
        }
    };

    requestAnimationFrame(animateStep); // Start the animation
};

// Function to get the current location of the satellite
export async function getLocation(): Promise<LngLat> {
    try {
        // Fetch satellite location data
        const response = await fetch('https://api.wheretheiss.at/v1/satellites/25544', {method: 'GET'});
        const {longitude, latitude} = await response.json();
        return [longitude, latitude]; // Return coordinates as LngLat
    } catch (err) {
        console.error('Failed to fetch satellite location:', err);
        throw new Error('Failed to fetch satellite location');
    }
}