ol/loadingstrategy.js

OpenLayers mapping library

/**
 * @module ol/loadingstrategy
 */
/**
 * Strategy function for loading all features with a single request.
 * @param {import("./extent.js").Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @return {Array<import("./extent.js").Extent>} Extents.
 * @api
 */
export function all(extent, resolution) {
    return [[-Infinity, -Infinity, Infinity, Infinity]];
}
/**
 * Strategy function for loading features based on the view's extent and
 * resolution.
 * @param {import("./extent.js").Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @return {Array<import("./extent.js").Extent>} Extents.
 * @api
 */
export function bbox(extent, resolution) {
    return [extent];
}
/**
 * Creates a strategy function for loading features based on a tile grid.
 * @param {import("./tilegrid/TileGrid.js").default} tileGrid Tile grid.
 * @return {function(import("./extent.js").Extent, number): Array<import("./extent.js").Extent>} Loading strategy.
 * @api
 */
export function tile(tileGrid) {
    return (
    /**
     * @param {import("./extent.js").Extent} extent Extent.
     * @param {number} resolution Resolution.
     * @return {Array<import("./extent.js").Extent>} Extents.
     */
    function (extent, resolution) {
        var z = tileGrid.getZForResolution(resolution);
        var tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
        /** @type {Array<import("./extent.js").Extent>} */
        var extents = [];
        /** @type {import("./tilecoord.js").TileCoord} */
        var tileCoord = [z, 0, 0];
        for (tileCoord[1] = tileRange.minX; tileCoord[1] <= tileRange.maxX; ++tileCoord[1]) {
            for (tileCoord[2] = tileRange.minY; tileCoord[2] <= tileRange.maxY; ++tileCoord[2]) {
                extents.push(tileGrid.getTileCoordExtent(tileCoord));
            }
        }
        return extents;
    });
}
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