geoengine.de/src/layouts/Scroller.astro at a45185298db0bbfccc579805b0b65784a17429d1 · geo-engine/geoengine.de · GitHub

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---
import 'maplibre-gl/dist/maplibre-gl.css';
import '../styles/scroller.css';

import {useTranslations} from '../i18n/utils';
import type {InferEntrySchema} from 'astro:content';

interface Props {
    title: string;
    description?: string;
    chapters: InferEntrySchema<'scroller'>;
}

const currentLocale = Astro.currentLocale;
const t = useTranslations(currentLocale);

const {title, description = t('header.slogan'), chapters} = Astro.props;

if (!chapters) {
    throw new Error('Must define `chapters` variable');
}

const pageTitle = `${title} - Geo Engine`;
---

<html lang={currentLocale}>
    <head>
        <meta charset="utf-8" />
        <link rel="icon" type="image/svg+xml" href="/favicon.png" />
        <meta name="viewport" content="width=device-width" />
        <meta name="generator" content={Astro.generator} />
        <meta name="description" content={description} />
        <title>{pageTitle}</title>
    </head>

    <div id="chapters" data-chapters={JSON.stringify(chapters)}></div>

    <script>
        import maplibregl from 'maplibre-gl';
        import scrollama from 'scrollama';

        const div = document.getElementById('chapters');
        const property = div?.dataset.chapters;

        const chapters = JSON.parse(property ?? '[]');

        // --- 1. INITIALIZE MAP ---
        const map = new maplibregl.Map({
            container: 'map',
            style: {
                version: 8,
                sources: {
                    'google-satellite': {
                        type: 'raster',
                        tiles: ['https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}'],
                        tileSize: 256,
                        attribution: '&copy; Google Satellite',
                    },
                },
                layers: [{id: 'google-layer', type: 'raster', source: 'google-satellite'}],
            },
            center: chapters[0].location.center,
            zoom: chapters[0].location.zoom,
            pitch: chapters[0].location.pitch,
            bearing: chapters[0].location.bearing,
            interactive: false,
        });

        // --- 2. SCROLL INTERACTION ---
        const scroller = scrollama();

        map.on('load', function () {
            scroller
                .setup({
                    step: '.step',
                    offset: 0.5, // Trigger slightly below middle
                    debug: false,
                })
                .onStepEnter((response) => {
                    const chapter = chapters[response.index];

                    // Highlight active step
                    document.querySelectorAll('.step').forEach((el) => el.classList.remove('active'));
                    response.element.classList.add('active');

                    // Fly to location
                    map.flyTo({
                        center: chapter.location.center,
                        zoom: chapter.location.zoom,
                        pitch: chapter.location.pitch,
                        bearing: chapter.location.bearing,
                        essential: true,
                        speed: 0.6, // Smooth cinematic speed
                        curve: 1.2,
                    });
                });
        });

        window.addEventListener('resize', scroller.resize);
    </script>

    <body>
        <div id="map"></div>

        <div id="story">
            <slot />
        </div>
    </body>


</html>