Slightly smaller functions
This commit is contained in:
Tim Schaub
@@ -165,205 +165,212 @@ export function getVectorTileUrlTemplate(links, mediaType) {
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return tileUrlTemplate;
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}
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/**
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* @param {SourceInfo} sourceInfo The source info.
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* @param {TileMatrixSet} tileMatrixSet Tile matrix set.
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* @param {string} tileUrlTemplate Tile URL template.
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* @param {Array<TileMatrixSetLimit>} [tileMatrixSetLimits] Tile matrix set limits.
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* @return {TileSetInfo} Tile set info.
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*/
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function parseTileMatrixSet(
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sourceInfo,
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tileMatrixSet,
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tileUrlTemplate,
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tileMatrixSetLimits
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) {
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let projection = sourceInfo.projection;
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if (!projection) {
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projection = getProjection(tileMatrixSet.crs);
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if (!projection) {
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throw new Error(`Unsupported CRS: ${tileMatrixSet.crs}`);
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}
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}
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const backwards = projection.getAxisOrientation().substr(0, 2) !== 'en';
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const matrices = tileMatrixSet.tileMatrices;
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/**
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* @type {Object<string, TileMatrix>}
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*/
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const matrixLookup = {};
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for (let i = 0; i < matrices.length; ++i) {
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const matrix = matrices[i];
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matrixLookup[matrix.id] = matrix;
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}
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/**
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* @type {Object<string, TileMatrixSetLimit>}
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*/
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const limitLookup = {};
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/**
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* @type {Array<string>}
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*/
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const matrixIds = [];
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if (tileMatrixSetLimits) {
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for (let i = 0; i < tileMatrixSetLimits.length; ++i) {
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const limit = tileMatrixSetLimits[i];
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const id = limit.tileMatrix;
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matrixIds.push(id);
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limitLookup[id] = limit;
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}
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} else {
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for (let i = 0; i < matrices.length; ++i) {
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const id = matrices[i].id;
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matrixIds.push(id);
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}
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}
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const length = matrixIds.length;
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const origins = new Array(length);
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const resolutions = new Array(length);
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const sizes = new Array(length);
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const tileSizes = new Array(length);
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const extent = [-Infinity, -Infinity, Infinity, Infinity];
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for (let i = 0; i < length; ++i) {
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const id = matrixIds[i];
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const matrix = matrixLookup[id];
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const origin = matrix.pointOfOrigin;
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if (backwards) {
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origins[i] = [origin[1], origin[0]];
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} else {
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origins[i] = origin;
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}
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resolutions[i] = matrix.cellSize;
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sizes[i] = [matrix.matrixWidth, matrix.matrixHeight];
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tileSizes[i] = [matrix.tileWidth, matrix.tileHeight];
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const limit = limitLookup[id];
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if (limit) {
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const tileMapWidth = matrix.cellSize * matrix.tileWidth;
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const minX = origins[i][0] + limit.minTileCol * tileMapWidth;
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const maxX = origins[i][0] + (limit.maxTileCol + 1) * tileMapWidth;
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const tileMapHeight = matrix.cellSize * matrix.tileHeight;
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const upsideDown = matrix.cornerOfOrigin === BOTTOM_LEFT_ORIGIN;
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let minY;
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let maxY;
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if (upsideDown) {
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minY = origins[i][1] + limit.minTileRow * tileMapHeight;
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maxY = origins[i][1] + (limit.maxTileRow + 1) * tileMapHeight;
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} else {
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minY = origins[i][1] - (limit.maxTileRow + 1) * tileMapHeight;
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maxY = origins[i][1] - limit.minTileRow * tileMapHeight;
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}
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intersectExtents(extent, [minX, minY, maxX, maxY], extent);
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}
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}
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const tileGrid = new TileGrid({
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origins: origins,
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resolutions: resolutions,
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sizes: sizes,
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tileSizes: tileSizes,
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extent: tileMatrixSetLimits ? extent : undefined,
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});
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const context = sourceInfo.context;
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const base = sourceInfo.url;
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function tileUrlFunction(tileCoord, pixelRatio, projection) {
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if (!tileCoord) {
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return undefined;
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}
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const id = matrixIds[tileCoord[0]];
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const matrix = matrixLookup[id];
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const upsideDown = matrix.cornerOfOrigin === BOTTOM_LEFT_ORIGIN;
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const localContext = {
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tileMatrix: id,
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tileCol: tileCoord[1],
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tileRow: upsideDown ? -tileCoord[2] - 1 : tileCoord[2],
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};
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if (tileMatrixSetLimits) {
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const limit = limitLookup[matrix.id];
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if (
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localContext.tileCol < limit.minTileCol ||
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localContext.tileCol > limit.maxTileCol ||
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localContext.tileRow < limit.minTileRow ||
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localContext.tileRow > limit.maxTileRow
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) {
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return undefined;
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}
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}
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assign(localContext, context);
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const url = tileUrlTemplate.replace(/\{(\w+?)\}/g, function (m, p) {
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return localContext[p];
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});
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return resolveUrl(base, url);
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}
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return {
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grid: tileGrid,
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urlTemplate: tileUrlTemplate,
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urlFunction: tileUrlFunction,
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};
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}
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/**
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* @param {SourceInfo} sourceInfo The source info.
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* @param {TileSet} tileSet Tile set.
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* @return {TileSetInfo|Promise<TileSetInfo>} Tile set info.
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*/
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function parseTileSetMetadata(sourceInfo, tileSet) {
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const tileMatrixSetLimits = tileSet.tileMatrixSetLimits;
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let tileUrlTemplate;
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if (tileSet.dataType === TileType.MAP) {
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tileUrlTemplate = getMapTileUrlTemplate(
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tileSet.links,
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sourceInfo.mediaType
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);
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} else if (tileSet.dataType === TileType.VECTOR) {
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tileUrlTemplate = getVectorTileUrlTemplate(
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tileSet.links,
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sourceInfo.mediaType
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);
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} else {
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throw new Error('Expected tileset data type to be "map" or "vector"');
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}
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if (tileSet.tileMatrixSet) {
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return parseTileMatrixSet(
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sourceInfo,
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tileSet.tileMatrixSet,
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tileUrlTemplate,
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tileMatrixSetLimits
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);
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}
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if (!tileSet.tileMatrixSetDefinition) {
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throw new Error('Expected tileMatrixSetDefinition or tileMatrixSet');
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}
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const url = resolveUrl(sourceInfo.url, tileSet.tileMatrixSetDefinition);
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return getJSON(url).then(function (tileMatrixSet) {
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return parseTileMatrixSet(
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sourceInfo,
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tileMatrixSet,
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tileUrlTemplate,
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tileMatrixSetLimits
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);
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});
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}
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/**
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* @param {SourceInfo} sourceInfo Source info.
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* @return {Promise<TileSetInfo>} Tile set info.
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*/
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export function getTileSetInfo(sourceInfo) {
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/**
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* @param {TileMatrixSet} tileMatrixSet Tile matrix set.
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* @param {string} tileUrlTemplate Tile URL template.
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* @param {Array<TileMatrixSetLimit>} [tileMatrixSetLimits] Tile matrix set limits.
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* @return {TileSetInfo} Tile set info.
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*/
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function parseTileMatrixSet(
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tileMatrixSet,
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tileUrlTemplate,
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tileMatrixSetLimits
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) {
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let projection = sourceInfo.projection;
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if (!projection) {
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projection = getProjection(tileMatrixSet.crs);
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if (!projection) {
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throw new Error(`Unsupported CRS: ${tileMatrixSet.crs}`);
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}
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}
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const backwards = projection.getAxisOrientation().substr(0, 2) !== 'en';
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const matrices = tileMatrixSet.tileMatrices;
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/**
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* @type {Object<string, TileMatrix>}
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*/
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const matrixLookup = {};
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for (let i = 0; i < matrices.length; ++i) {
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const matrix = matrices[i];
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matrixLookup[matrix.id] = matrix;
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}
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/**
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* @type {Object<string, TileMatrixSetLimit>}
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*/
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const limitLookup = {};
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/**
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* @type {Array<string>}
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*/
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const matrixIds = [];
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if (tileMatrixSetLimits) {
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for (let i = 0; i < tileMatrixSetLimits.length; ++i) {
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const limit = tileMatrixSetLimits[i];
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const id = limit.tileMatrix;
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matrixIds.push(id);
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limitLookup[id] = limit;
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}
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} else {
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for (let i = 0; i < matrices.length; ++i) {
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const id = matrices[i].id;
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matrixIds.push(id);
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}
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}
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const length = matrixIds.length;
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const origins = new Array(length);
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const resolutions = new Array(length);
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const sizes = new Array(length);
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const tileSizes = new Array(length);
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const extent = [-Infinity, -Infinity, Infinity, Infinity];
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for (let i = 0; i < length; ++i) {
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const id = matrixIds[i];
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const matrix = matrixLookup[id];
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const origin = matrix.pointOfOrigin;
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if (backwards) {
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origins[i] = [origin[1], origin[0]];
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} else {
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origins[i] = origin;
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}
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resolutions[i] = matrix.cellSize;
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sizes[i] = [matrix.matrixWidth, matrix.matrixHeight];
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tileSizes[i] = [matrix.tileWidth, matrix.tileHeight];
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const limit = limitLookup[id];
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if (limit) {
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const tileMapWidth = matrix.cellSize * matrix.tileWidth;
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const minX = origins[i][0] + limit.minTileCol * tileMapWidth;
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const maxX = origins[i][0] + (limit.maxTileCol + 1) * tileMapWidth;
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const tileMapHeight = matrix.cellSize * matrix.tileHeight;
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const upsideDown = matrix.cornerOfOrigin === BOTTOM_LEFT_ORIGIN;
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let minY;
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let maxY;
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if (upsideDown) {
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minY = origins[i][1] + limit.minTileRow * tileMapHeight;
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maxY = origins[i][1] + (limit.maxTileRow + 1) * tileMapHeight;
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} else {
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minY = origins[i][1] - (limit.maxTileRow + 1) * tileMapHeight;
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maxY = origins[i][1] - limit.minTileRow * tileMapHeight;
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}
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intersectExtents(extent, [minX, minY, maxX, maxY], extent);
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}
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}
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const tileGrid = new TileGrid({
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origins: origins,
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resolutions: resolutions,
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sizes: sizes,
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tileSizes: tileSizes,
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extent: tileMatrixSetLimits ? extent : undefined,
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});
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const context = sourceInfo.context;
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const base = sourceInfo.url;
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function tileUrlFunction(tileCoord, pixelRatio, projection) {
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if (!tileCoord) {
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return undefined;
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}
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const id = matrixIds[tileCoord[0]];
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const matrix = matrixLookup[id];
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const upsideDown = matrix.cornerOfOrigin === BOTTOM_LEFT_ORIGIN;
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const localContext = {
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tileMatrix: id,
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tileCol: tileCoord[1],
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tileRow: upsideDown ? -tileCoord[2] - 1 : tileCoord[2],
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};
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if (tileMatrixSetLimits) {
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const limit = limitLookup[matrix.id];
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if (
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localContext.tileCol < limit.minTileCol ||
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localContext.tileCol > limit.maxTileCol ||
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localContext.tileRow < limit.minTileRow ||
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localContext.tileRow > limit.maxTileRow
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) {
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return undefined;
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}
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}
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assign(localContext, context);
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const url = tileUrlTemplate.replace(/\{(\w+?)\}/g, function (m, p) {
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return localContext[p];
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});
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return resolveUrl(base, url);
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}
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return {
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grid: tileGrid,
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urlTemplate: tileUrlTemplate,
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urlFunction: tileUrlFunction,
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};
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}
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/**
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* @param {TileSet} tileSet Tile set.
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* @return {TileSetInfo|Promise<TileSetInfo>} Tile set info.
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*/
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function parseTileSetMetadata(tileSet) {
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const tileMatrixSetLimits = tileSet.tileMatrixSetLimits;
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let tileUrlTemplate;
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if (tileSet.dataType === TileType.MAP) {
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tileUrlTemplate = getMapTileUrlTemplate(
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tileSet.links,
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sourceInfo.mediaType
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);
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} else if (tileSet.dataType === TileType.VECTOR) {
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tileUrlTemplate = getVectorTileUrlTemplate(
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tileSet.links,
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sourceInfo.mediaType
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);
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} else {
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throw new Error('Expected tileset data type to be "map" or "vector"');
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}
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if (tileSet.tileMatrixSet) {
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return parseTileMatrixSet(
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tileSet.tileMatrixSet,
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tileUrlTemplate,
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tileMatrixSetLimits
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);
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}
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if (!tileSet.tileMatrixSetDefinition) {
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throw new Error('Expected tileMatrixSetDefinition or tileMatrixSet');
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}
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const url = resolveUrl(sourceInfo.url, tileSet.tileMatrixSetDefinition);
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return getJSON(url).then(function (tileMatrixSet) {
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return parseTileMatrixSet(
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tileMatrixSet,
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tileUrlTemplate,
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tileMatrixSetLimits
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);
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});
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}
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return getJSON(sourceInfo.url).then(parseTileSetMetadata);
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return getJSON(sourceInfo.url).then(function (tileSet) {
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return parseTileSetMetadata(sourceInfo, tileSet);
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});
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}
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