s/ol3/ol/
This commit is contained in:
Tom Payne
311
src/ol/tilegrid.js
Normal file
311
src/ol/tilegrid.js
Normal file
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// FIXME cope with tile grids whose minium zoom is not zero
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goog.provide('ol.TileGrid');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('ol.Coordinate');
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goog.require('ol.Extent');
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goog.require('ol.PixelBounds');
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goog.require('ol.Size');
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goog.require('ol.TileBounds');
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goog.require('ol.TileCoord');
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goog.require('ol.array');
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/**
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* @constructor
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* @param {!Array.<number>} resolutions Resolutions.
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* @param {ol.Extent} extent Extent.
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* @param {ol.Coordinate|!Array.<ol.Coordinate>} origin Origin.
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* @param {ol.Size=} opt_tileSize Tile size.
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*/
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ol.TileGrid = function(resolutions, extent, origin, opt_tileSize) {
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/**
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* @private
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* @type {Array.<number>}
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*/
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this.resolutions_ = resolutions;
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goog.asserts.assert(goog.array.isSorted(resolutions, function(a, b) {
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return b - a;
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}, true));
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/**
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* @private
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* @type {number}
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*/
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this.numResolutions_ = this.resolutions_.length;
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/**
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* @private
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* @type {ol.Extent}
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*/
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this.extent_ = extent;
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/**
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* @private
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* @type {ol.Coordinate}
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*/
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this.origin_ = null;
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/**
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* @private
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* @type {Array.<ol.Coordinate>}
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*/
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this.origins_ = null;
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if (origin instanceof ol.Coordinate) {
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this.origin_ = origin;
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} else if (goog.isArray(origin)) {
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goog.asserts.assert(origin.length == this.numResolutions_);
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this.origins_ = origin;
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} else {
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goog.asserts.assert(false);
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}
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/**
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* @private
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* @type {ol.Size}
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*/
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this.tileSize_ = opt_tileSize || new ol.Size(256, 256);
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {function(this: T, number, ol.TileBounds): boolean} callback
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* Callback.
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* @param {T=} opt_obj Object.
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* @template T
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*/
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ol.TileGrid.prototype.forEachTileCoordParentTileBounds =
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function(tileCoord, callback, opt_obj) {
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var tileCoordExtent = this.getTileCoordExtent(tileCoord);
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var z = tileCoord.z - 1;
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while (z >= 0) {
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if (callback.call(
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opt_obj, z, this.getTileBoundsForExtentAndZ(tileCoordExtent, z))) {
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return;
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}
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--z;
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}
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};
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/**
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* @return {ol.Extent} Extent.
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*/
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ol.TileGrid.prototype.getExtent = function() {
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return this.extent_;
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};
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/**
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* @param {number} z Z.
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* @return {ol.Coordinate} Origin.
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*/
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ol.TileGrid.prototype.getOrigin = function(z) {
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if (!goog.isNull(this.origin_)) {
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return this.origin_;
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} else {
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goog.asserts.assert(!goog.isNull(this.origins_));
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goog.asserts.assert(0 <= z && z < this.origins_.length);
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return this.origins_[z];
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}
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {number} resolution Resolution.
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* @return {ol.PixelBounds} Pixel bounds.
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*/
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ol.TileGrid.prototype.getPixelBoundsForTileCoordAndResolution = function(
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tileCoord, resolution) {
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var scale = resolution / this.getResolution(tileCoord.z);
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var tileSize = this.getTileSize();
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tileSize = new ol.Size(tileSize.width / scale,
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tileSize.height / scale);
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var minX, maxX, minY, maxY;
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minX = Math.round(tileCoord.x * tileSize.width);
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maxX = Math.round((tileCoord.x + 1) * tileSize.width);
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minY = Math.round(tileCoord.y * tileSize.height);
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maxY = Math.round((tileCoord.y + 1) * tileSize.height);
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return new ol.PixelBounds(minX, minY, maxX, maxY);
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};
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/**
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* @param {number} z Z.
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* @return {number} Resolution.
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*/
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ol.TileGrid.prototype.getResolution = function(z) {
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goog.asserts.assert(0 <= z && z < this.numResolutions_);
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return this.resolutions_[z];
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};
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/**
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* @return {Array.<number>} Resolutions.
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*/
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ol.TileGrid.prototype.getResolutions = function() {
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return this.resolutions_;
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};
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/**
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* @param {number} z Z.
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* @param {ol.TileBounds} tileBounds Tile bounds.
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* @return {ol.Extent} Extent.
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*/
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ol.TileGrid.prototype.getTileBoundsExtent = function(z, tileBounds) {
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var origin = this.getOrigin(z);
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var resolution = this.getResolution(z);
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var tileSize = this.tileSize_;
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var minX = origin.x + tileBounds.minX * tileSize.width * resolution;
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var minY = origin.y + tileBounds.minY * tileSize.height * resolution;
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var maxX = origin.x + (tileBounds.maxX + 1) * tileSize.width * resolution;
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var maxY = origin.y + (tileBounds.maxY + 1) * tileSize.height * resolution;
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return new ol.Extent(minX, minY, maxX, maxY);
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};
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/**
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* @param {ol.Extent} extent Extent.
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* @param {number} resolution Resolution.
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* @return {ol.TileBounds} Tile bounds.
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*/
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ol.TileGrid.prototype.getTileBoundsForExtentAndResolution = function(
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extent, resolution) {
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var min = this.getTileCoordForCoordAndResolution(
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new ol.Coordinate(extent.minX, extent.minY), resolution);
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var max = this.getTileCoordForCoordAndResolution(
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new ol.Coordinate(extent.maxX, extent.maxY), resolution);
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return new ol.TileBounds(min.x, min.y, max.x, max.y);
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};
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/**
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* @param {ol.Extent} extent Extent.
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* @param {number} z Z.
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* @return {ol.TileBounds} Tile bounds.
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*/
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ol.TileGrid.prototype.getTileBoundsForExtentAndZ = function(extent, z) {
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var resolution = this.getResolution(z);
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return this.getTileBoundsForExtentAndResolution(extent, resolution);
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @return {ol.Coordinate} Tile center.
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*/
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ol.TileGrid.prototype.getTileCoordCenter = function(tileCoord) {
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var origin = this.getOrigin(tileCoord.z);
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var resolution = this.getResolution(tileCoord.z);
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var tileSize = this.tileSize_;
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var x = origin.x + (tileCoord.x + 0.5) * tileSize.width * resolution;
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var y = origin.y + (tileCoord.y + 0.5) * tileSize.height * resolution;
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return new ol.Coordinate(x, y);
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @return {ol.Extent} Extent.
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*/
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ol.TileGrid.prototype.getTileCoordExtent = function(tileCoord) {
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var origin = this.getOrigin(tileCoord.z);
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var resolution = this.getResolution(tileCoord.z);
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var tileSize = this.tileSize_;
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var minX = origin.x + tileCoord.x * tileSize.width * resolution;
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var minY = origin.y + tileCoord.y * tileSize.height * resolution;
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var maxX = minX + tileSize.width * resolution;
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var maxY = minY + tileSize.height * resolution;
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return new ol.Extent(minX, minY, maxX, maxY);
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};
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/**
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {number} resolution Resolution.
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* @return {ol.TileCoord} Tile coordinate.
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*/
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ol.TileGrid.prototype.getTileCoordForCoordAndResolution = function(
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coordinate, resolution) {
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var z = this.getZForResolution(resolution);
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var scale = resolution / this.getResolution(z);
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var origin = this.getOrigin(z);
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var offsetFromOrigin = new ol.Coordinate(
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Math.floor((coordinate.x - origin.x) / resolution),
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Math.floor((coordinate.y - origin.y) / resolution));
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var tileSize = this.getTileSize();
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tileSize = new ol.Size(tileSize.width / scale,
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tileSize.height / scale);
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var x, y;
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x = Math.floor(offsetFromOrigin.x / tileSize.width);
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y = Math.floor(offsetFromOrigin.y / tileSize.height);
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var tileCoord = new ol.TileCoord(z, x, y);
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var tileCoordPixelBounds = this.getPixelBoundsForTileCoordAndResolution(
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tileCoord, resolution);
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// adjust x to allow for stretched tiles
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if (offsetFromOrigin.x < tileCoordPixelBounds.minX) {
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tileCoord.x -= 1;
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} else if (offsetFromOrigin.x >= tileCoordPixelBounds.maxX) {
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tileCoord.x += 1;
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}
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// adjust y to allow for stretched tiles
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if (offsetFromOrigin.y < tileCoordPixelBounds.minY) {
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tileCoord.y -= 1;
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} else if (offsetFromOrigin.y >= tileCoordPixelBounds.maxY) {
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tileCoord.y += 1;
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}
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return tileCoord;
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};
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/**
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* @param {ol.Coordinate} coordinate Coordinate.
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* @param {number} z Z.
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* @return {ol.TileCoord} Tile coordinate.
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*/
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ol.TileGrid.prototype.getTileCoordForCoordAndZ = function(coordinate, z) {
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var resolution = this.getResolution(z);
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return this.getTileCoordForCoordAndResolution(coordinate, resolution);
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};
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @return {number} Tile resolution.
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*/
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ol.TileGrid.prototype.getTileCoordResolution = function(tileCoord) {
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goog.asserts.assert(0 <= tileCoord.z && tileCoord.z < this.numResolutions_);
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return this.resolutions_[tileCoord.z];
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};
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/**
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* @return {ol.Size} Tile size.
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*/
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ol.TileGrid.prototype.getTileSize = function() {
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return this.tileSize_;
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};
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/**
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* @param {number} resolution Resolution.
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* @return {number} Z.
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*/
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ol.TileGrid.prototype.getZForResolution = function(resolution) {
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return ol.array.linearFindNearest(this.resolutions_, resolution);
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};
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