svelte-maplibre-gl/dist/utils.js

Build interactive web maps effortlessly with MapLibre GL JS and Svelte

let layerIdCounter = 0;
let sourceIdCounter = 0;
export function generateLayerID() {
    return `svmlgl-layer-${layerIdCounter++}`;
}
export function generateSourceID() {
    return `svmlgl-source-${sourceIdCounter++}`;
}
/**
 * Set an event listener on an Evented object, and return a function that will remove the listener.
 *
 * Intended to be used within the $effect rune.
 */
export function resetEventListener(evented, type, listener) {
    if (listener) {
        evented?.on(type, listener);
    }
    const prevListener = listener;
    return () => {
        if (prevListener) {
            evented?.off(type, prevListener);
        }
    };
}
/**
 * Set a Layer event listener on the Map object, and return a function that will remove the listener.
 *
 * Intended to be used within the $effect rune.
 */
export function resetLayerEventListener(map, type, layer, listener) {
    if (listener) {
        map?.on(type, layer, listener);
    }
    const prevListener = listener;
    return () => {
        if (prevListener) {
            map?.off(type, layer, prevListener);
        }
    };
}
/**
 * Returns whichever object actually carries MapLibre's internal camera state,
 * so the same call sites work on both MapLibre 5.x and 6.x. See {@link MapCamera}.
 */
export function getCamera(map) {
    const m = map;
    return m._camera ?? m;
}
/**
 * Reads the pending "desired state" camera transform, bridging the 5.x
 * `_getTransformForUpdate()` / 6.x `getTransformForUpdate()` rename.
 */
export function getUpdateTransform(camera) {
    const resolve = camera.getTransformForUpdate ?? camera._getTransformForUpdate;
    if (!resolve) {
        throw new Error('svelte-maplibre-gl: neither getTransformForUpdate nor _getTransformForUpdate is available on the map camera');
    }
    return resolve.call(camera);
}
export function setTransformCameraUpdate(map, value) {
    const m = map;
    if (m.setTransformCameraUpdate) {
        m.setTransformCameraUpdate(value);
    }
    else {
        getCamera(map).transformCameraUpdate = value;
    }
}
export function formatLngLat(target, lnglat) {
    if (Array.isArray(target)) {
        return [lnglat.lng, lnglat.lat];
    }
    else if ('lon' in target) {
        return { lon: lnglat.lng, lat: lnglat.lat };
    }
    else {
        return { lng: lnglat.lng, lat: lnglat.lat };
    }
}