terriajs/lib/Models/ImageryLayerPreloadHelpers.js

Geospatial data visualization platform.

'use strict';

/*global require*/
var defined = require('terriajs-cesium/Source/Core/defined');


function setOpacity(catalogItem, layer, opacity) {
    if (!defined(layer)) {
        return;
    }

    if (defined(catalogItem.terria.cesium)) {
        layer.alpha = opacity;
    }

    if (defined(catalogItem.terria.leaflet)) {
        layer.setOpacity(opacity);
    }
}

function fixNextLayerOrder(catalogItem, layer, nextLayer) {
    if (!defined(layer) || !defined(nextLayer)) {
        return;
    }

    if (defined(catalogItem.terria.cesium)) {
        var imageryLayers = catalogItem.terria.cesium.scene.imageryLayers;

        var currentIndex = imageryLayers.indexOf(layer);
        var nextIndex = imageryLayers.indexOf(nextLayer);
        if (currentIndex < 0 || nextIndex < 0) {
            return;
        }

        while (nextIndex < currentIndex - 1) {
            imageryLayers.raise(nextLayer);
            ++nextIndex;
        }

        while (nextIndex > currentIndex + 1) {
            imageryLayers.lower(nextLayer);
            --nextIndex;
        }
    }
}

module.exports = { setOpacity, fixNextLayerOrder };