MediaWiki:Common.js

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// Custom Agon World Map with Leaflet (tiled)
(function() {
    // Only run on map pages
    if (!document.getElementById('agon-map-container')) return;

    // Load Leaflet CSS
    var link = document.createElement('link');
    link.rel = 'stylesheet';
    link.href = 'https://unpkg.com/leaflet@1.9.4/dist/leaflet.css';
    document.head.appendChild(link);

    // Load Leaflet JS
    var script = document.createElement('script');
    script.src = 'https://unpkg.com/leaflet@1.9.4/dist/leaflet.js';
    script.onload = function() {
        initAgonMap();
    };
    document.head.appendChild(script);
})();

function initAgonMap() {
    var mapContainer = document.getElementById('agon-map-container');
    if (!mapContainer) return;

    // Image dimensions and tiling
    var imageWidth = 16384;
    var imageHeight = 16384;
    var tileSize = 256;
    var maxZoom = 6; // 16384 / 256 = 64 => log2(64) = 6

    // Create map with custom CRS for image coordinates
    var map = L.map('agon-map-container', {
        crs: L.CRS.Simple,
        minZoom: 0,
        maxZoom: maxZoom,
        zoom: 0
    });

    // Convert pixel bounds to lat/lng bounds using unproject at max zoom
    var southWest = map.unproject([0, imageHeight], maxZoom);
    var northEast = map.unproject([imageWidth, 0], maxZoom);
    var bounds = new L.LatLngBounds(southWest, northEast);

    // Tile layer using generated pyramid under /resources/assets/tiles/AgonBigMap/{z}/{x}/{y}.jpg
    var tileUrl = mw.config.get('wgScriptPath') + '/resources/assets/tiles/AgonBigMap/{z}/{x}/{y}.jpg';
    L.tileLayer(tileUrl, {
        tileSize: tileSize,
        minZoom: 0,
        maxZoom: maxZoom,
        maxNativeZoom: maxZoom,
        bounds: bounds,
        noWrap: true
    }).addTo(map);

    // Fit map to bounds and keep panning constrained
    map.fitBounds(bounds);
    map.setMaxBounds(bounds);

    // Add scale
    L.control.scale().addTo(map);

    // Click to get coordinates (report image pixel coords Y, X)
    map.on('click', function(e) {
        var point = map.project(e.latlng, maxZoom); // pixel space
        var y = point.y.toFixed(2);
        var x = point.x.toFixed(2);
        var text = 'Coordinates: ' + y + ', ' + x;
        console.log(text);
        L.popup()
            .setLatLng(e.latlng)
            .setContent(text)
            .openOn(map);
    });

    // Load markers from page data; stored as 'Y, X' pixel coordinates
    if (window.agonMapMarkers) {
        window.agonMapMarkers.forEach(function(marker) {
            var coords = marker.coordinates.split(',').map(parseFloat); // [Y, X]
            var latlng = map.unproject([coords[1], coords[0]], maxZoom); // [x, y]
            var icon = L.icon({
                iconUrl: marker.icon || mw.config.get('wgScriptPath') + '/resources/assets/marker-icon.png',
                iconSize: [25, 41],
                iconAnchor: [12, 41],
                popupAnchor: [1, -34]
            });

            L.marker(latlng, { icon: icon })
                .addTo(map)
                .bindPopup('<b>' + marker.name + '</b><br>' + marker.description);
        });
    }
}