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# 맵에 선을 추가하는 방법
<a name="how-to-add-line-on-map"></a>

Amazon Location Service를 사용하면 사전 레코딩된 GPS 추적을 선-문자열로 추가하고 실시간 GPS 추적을 동적 맵에 추가할 수 있습니다.

## 사전 레코딩된 선 추가
<a name="add-pre-recorded-line"></a>

이 예제에서는 사전 레코딩된 GPS 추적을 동적 맵에 GeoJSON(main.js)으로 추가합니다. 이렇게 하려면 맵에 소스(예: GeoJSON)와 선택한 선 스타일이 있는 계층을 추가해야 합니다.

### 사전 레코딩된 선 코드 예제
<a name="web-code-example-pre-recorded-line"></a>

------
#### [ index.html ]

```
<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Add a line on the map</title>
        <meta property="og:description" content="Initialize a map in an HTML element with MapLibre GL JS." />
        <meta charset='utf-8'>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@5.x/dist/maplibre-gl.css' />
        <link rel='stylesheet' href='style.css' />
        <script src='https://unpkg.com/maplibre-gl@5.x/dist/maplibre-gl.js'></script>
        <script src='main.js'></script>
    </head>
    <body>
        <!-- Map container -->
        <div id="map"></div>
        <script>
            const apiKey = "<API_KEY>";
            const mapStyle = "Standard";
            const awsRegion = "eu-central-1";
            const styleUrl = `https://maps.geo.${awsRegion}.amazonaws.com/v2/styles/${mapStyle}/descriptor?key=${apiKey}`;

            const map = new maplibregl.Map({
                container: 'map',
                style: styleUrl,
                center: [-123.126575, 49.290585],
                zoom: 12.5
            });

            map.on('load', () => {
                map.addSource('vancouver-office-to-stanley-park-route', {
                    type: 'geojson',
                    data: routeGeoJSON
                });

                map.addLayer({
                    id: 'vancouver-office-to-stanley-park-route',
                    type: 'line',
                    source: 'vancouver-office-to-stanley-park-route',
                    layout: {
                        'line-cap': 'round',
                        'line-join': 'round'
                    },
                    paint: {
                        'line-color': '#008296',
                        'line-width': 2
                    }
                });
            });
        </script>
    </body>
</html>
```

------
#### [ style.css ]

```
body { margin: 0; padding: 0; }
html, body, #map { height: 100%; }
```

------
#### [ main.js ]

```
const routeGeoJSON = {
    type: "FeatureCollection",
    features: [
        {
            type: "Feature",
            geometry: {
                type: "LineString",
                coordinates: [
                    [-123.117011, 49.281306],
                    [-123.11785, 49.28011],
                    ...
                    [-123.135735, 49.30106]
                ]
            },
            properties: {
                name: "Amazon YVR to Stanley Park",
                description: "An evening walk from Amazon office to Stanley Park."
            }
        }
    ]
};
```

------

## 실시간으로 선 추가
<a name="add-real-time-line"></a>

이 예제에서는 새 GPS 좌표를 하나씩 추가하여 실시간 GPS 추적을 생성하는 방법을 시뮬레이션합니다. 실시간 데이터 업데이트를 추적하는 데 유용합니다.

### 실시간 선 코드 예제
<a name="web-code-example-real-time-line"></a>

------
#### [ index.html ]

```
<!DOCTYPE html>
<html lang="en">
    <head>
        <title>Add a line on the map in real-time</title>
        <meta property="og:description" content="Initialize a map in an HTML element with MapLibre GL JS." />
        <meta charset='utf-8'>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@5.x/dist/maplibre-gl.css' />
        <link rel='stylesheet' href='style.css' />
        <script src='https://unpkg.com/maplibre-gl@5.x/dist/maplibre-gl.js'></script>
        <script src='main.js'></script>
    </head>
    <body>
        <!-- Map container -->
        <div id="map"></div>
        <script>
            const apiKey = "<API_KEY>";
            const mapStyle = "Standard";
            const awsRegion = "eu-central-1";
            const styleUrl = `https://maps.geo.${awsRegion}.amazonaws.com/v2/styles/${mapStyle}/descriptor?key=${apiKey}`;

            const map = new maplibregl.Map({
                container: 'map',
                style: styleUrl,
                center: [-123.126575, 49.290585],
                zoom: 12.5
            });

            map.on('load', () => {
                const coordinates = routeGeoJSON.features[0].geometry.coordinates;
                routeGeoJSON.features[0].geometry.coordinates = [coordinates[0], coordinates[20]];

                map.addSource('vancouver-office-to-stanley-park-route', {
                    type: 'geojson',
                    data: routeGeoJSON
                });

                map.addLayer({
                    id: 'vancouver-office-to-stanley-park-route',
                    type: 'line',
                    source: 'vancouver-office-to-stanley-park-route',
                    layout: {
                        'line-cap': 'round',
                        'line-join': 'round'
                    },
                    paint: {
                        'line-color': '#008296',
                        'line-width': 2
                    }
                });

                map.jumpTo({center: coordinates[0], zoom: 14});
                map.setPitch(30);

                let i = 0;
                const timer = window.setInterval(() => {
                    if (i < coordinates.length) {
                        routeGeoJSON.features[0].geometry.coordinates.push(coordinates[i]);
                        map.getSource('vancouver-office-to-stanley-park-route').setData(routeGeoJSON);
                        map.panTo(coordinates[i]);
                        i++;
                    } else {
                        window.clearInterval(timer);
                    }
                }, 100);
            });
        </script>
    </body>
</html>
```

------
#### [ style.css ]

```
body { margin: 0; padding: 0; }
html, body, #map { height: 100%; }
```

------
#### [ main.js ]

```
const routeGeoJSON = {
    type: "FeatureCollection",
    features: [
        {
            type: "Feature",
            geometry: {
                type: "LineString",
                coordinates: [
                    [-123.117011, 49.281306],
                    [-123.11785, 49.28011],
                    ...
                    [-123.135735, 49.30106]
                ]
            },
            properties: {
                name: "Amazon YVR to Stanley Park",
                description: "An evening walk from Amazon office to Stanley Park."
            }
        }
    ]
};
```

------

## 개발자 팁
<a name="developer-tips"></a>

**범위 맞춤:** 선 좌표의 범위를 계산하여 맵 범위에 선을 맞출 수 있습니다.

```
const coordinates = routeGeoJSON.features[0].geometry.coordinates;
const bounds = coordinates.reduce((bounds, coord) => bounds.extend(coord), new maplibregl.LngLatBounds(coordinates[0], coordinates[0]));
map.fitBounds(bounds, { padding: 20 });
```