goog.provide('ol.tilegrid.TileGrid');
goog.require('goog.array');
goog.require('goog.asserts');
goog.require('ol');
goog.require('ol.Coordinate');
goog.require('ol.TileCoord');
goog.require('ol.TileRange');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');
/**
* @constructor
* @param {olx.tilegrid.TileGridOptions} options Tile grid options.
* @struct
* @todo api
*/
ol.tilegrid.TileGrid = function(options) {
/**
* @protected
* @type {number}
*/
this.minZoom = goog.isDef(options.minZoom) ? options.minZoom : 0;
/**
* @private
* @type {!Array.<number>}
*/
this.resolutions_ = options.resolutions;
goog.asserts.assert(goog.array.isSorted(this.resolutions_, function(a, b) {
return b - a;
}, true));
/**
* @protected
* @type {number}
*/
this.maxZoom = this.resolutions_.length - 1;
/**
* @private
* @type {ol.Coordinate}
*/
this.origin_ = goog.isDef(options.origin) ? options.origin : null;
/**
* @private
* @type {Array.<ol.Coordinate>}
*/
this.origins_ = null;
if (goog.isDef(options.origins)) {
this.origins_ = options.origins;
goog.asserts.assert(this.origins_.length == this.maxZoom + 1);
}
goog.asserts.assert(
(goog.isNull(this.origin_) && !goog.isNull(this.origins_)) ||
(!goog.isNull(this.origin_) && goog.isNull(this.origins_)));
/**
* @private
* @type {Array.<number>}
*/
this.tileSizes_ = null;
if (goog.isDef(options.tileSizes)) {
this.tileSizes_ = options.tileSizes;
goog.asserts.assert(this.tileSizes_.length == this.maxZoom + 1);
}
/**
* @private
* @type {number|undefined}
*/
this.tileSize_ = goog.isDef(options.tileSize) ?
options.tileSize :
goog.isNull(this.tileSizes_) ? ol.DEFAULT_TILE_SIZE : undefined;
goog.asserts.assert(
(!goog.isDef(this.tileSize_) && !goog.isNull(this.tileSizes_)) ||
(goog.isDef(this.tileSize_) && goog.isNull(this.tileSizes_)));
};
/**
* @private
* @type {ol.TileCoord}
*/
ol.tilegrid.TileGrid.tmpTileCoord_ = new ol.TileCoord(0, 0, 0);
/**
* @param {{extent: (ol.Extent|undefined),
* wrapX: (boolean|undefined)}=} opt_options Options.
* @return {function(ol.TileCoord, ol.proj.Projection, ol.TileCoord=):
* ol.TileCoord} Tile coordinate transform.
*/
ol.tilegrid.TileGrid.prototype.createTileCoordTransform = goog.abstractMethod;
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {function(this: T, number, ol.TileRange): boolean} callback Callback.
* @param {T=} opt_this The object to use as `this` in `callback`.
* @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
* @param {ol.Extent=} opt_extent Temporary ol.Extent object.
* @return {boolean} Callback succeeded.
* @template T
*/
ol.tilegrid.TileGrid.prototype.forEachTileCoordParentTileRange =
function(tileCoord, callback, opt_this, opt_tileRange, opt_extent) {
var tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
var z = tileCoord.z - 1;
while (z >= this.minZoom) {
if (callback.call(opt_this, z,
this.getTileRangeForExtentAndZ(tileCoordExtent, z, opt_tileRange))) {
return true;
}
--z;
}
return false;
};
/**
* @return {number} Max zoom.
*/
ol.tilegrid.TileGrid.prototype.getMaxZoom = function() {
return this.maxZoom;
};
/**
* @return {number} Min zoom.
* @todo api
*/
ol.tilegrid.TileGrid.prototype.getMinZoom = function() {
return this.minZoom;
};
/**
* @param {number} z Z.
* @return {ol.Coordinate} Origin.
* @todo api
*/
ol.tilegrid.TileGrid.prototype.getOrigin = function(z) {
if (!goog.isNull(this.origin_)) {
return this.origin_;
} else {
goog.asserts.assert(!goog.isNull(this.origins_));
goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom);
return this.origins_[z];
}
};
/**
* @param {number} z Z.
* @return {number} Resolution.
* @todo api
*/
ol.tilegrid.TileGrid.prototype.getResolution = function(z) {
goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom);
return this.resolutions_[z];
};
/**
* @return {Array.<number>} Resolutions.
*/
ol.tilegrid.TileGrid.prototype.getResolutions = function() {
return this.resolutions_;
};
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
* @param {ol.Extent=} opt_extent Temporary ol.Extent object.
* @return {ol.TileRange} Tile range.
*/
ol.tilegrid.TileGrid.prototype.getTileCoordChildTileRange =
function(tileCoord, opt_tileRange, opt_extent) {
if (tileCoord.z < this.maxZoom) {
var tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
return this.getTileRangeForExtentAndZ(
tileCoordExtent, tileCoord.z + 1, opt_tileRange);
} else {
return null;
}
};
/**
* @param {number} z Z.
* @param {ol.TileRange} tileRange Tile range.
* @param {ol.Extent=} opt_extent Temporary ol.Extent object.
* @return {ol.Extent} Extent.
*/
ol.tilegrid.TileGrid.prototype.getTileRangeExtent =
function(z, tileRange, opt_extent) {
var origin = this.getOrigin(z);
var resolution = this.getResolution(z);
var tileSize = this.getTileSize(z);
var minX = origin[0] + tileRange.minX * tileSize * resolution;
var maxX = origin[0] + (tileRange.maxX + 1) * tileSize * resolution;
var minY = origin[1] + tileRange.minY * tileSize * resolution;
var maxY = origin[1] + (tileRange.maxY + 1) * tileSize * resolution;
return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} resolution Resolution.
* @param {ol.TileRange=} opt_tileRange Temporary tile range object.
* @return {ol.TileRange} Tile range.
*/
ol.tilegrid.TileGrid.prototype.getTileRangeForExtentAndResolution =
function(extent, resolution, opt_tileRange) {
var tileCoord = ol.tilegrid.TileGrid.tmpTileCoord_;
this.getTileCoordForXYAndResolution_(
extent[0], extent[1], resolution, false, tileCoord);
var minX = tileCoord.x;
var minY = tileCoord.y;
this.getTileCoordForXYAndResolution_(
extent[2], extent[3], resolution, true, tileCoord);
return ol.TileRange.createOrUpdate(
minX, tileCoord.x, minY, tileCoord.y, opt_tileRange);
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} z Z.
* @param {ol.TileRange=} opt_tileRange Temporary tile range object.
* @return {ol.TileRange} Tile range.
*/
ol.tilegrid.TileGrid.prototype.getTileRangeForExtentAndZ =
function(extent, z, opt_tileRange) {
var resolution = this.getResolution(z);
return this.getTileRangeForExtentAndResolution(
extent, resolution, opt_tileRange);
};
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @return {ol.Coordinate} Tile center.
*/
ol.tilegrid.TileGrid.prototype.getTileCoordCenter = function(tileCoord) {
var origin = this.getOrigin(tileCoord.z);
var resolution = this.getResolution(tileCoord.z);
var tileSize = this.getTileSize(tileCoord.z);
return [
origin[0] + (tileCoord.x + 0.5) * tileSize * resolution,
origin[1] + (tileCoord.y + 0.5) * tileSize * resolution
];
};
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @param {ol.Extent=} opt_extent Temporary extent object.
* @return {ol.Extent} Extent.
*/
ol.tilegrid.TileGrid.prototype.getTileCoordExtent =
function(tileCoord, opt_extent) {
var origin = this.getOrigin(tileCoord.z);
var resolution = this.getResolution(tileCoord.z);
var tileSize = this.getTileSize(tileCoord.z);
var minX = origin[0] + tileCoord.x * tileSize * resolution;
var minY = origin[1] + tileCoord.y * tileSize * resolution;
var maxX = minX + tileSize * resolution;
var maxY = minY + tileSize * resolution;
return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};
/**
* Get the tile coordinate for the given map coordinate and resolution. This
* method considers that coordinates that intersect tile boundaries should be
* assigned the higher tile coordinate.
*
* @param {ol.Coordinate} coordinate Coordinate.
* @param {number} resolution Resolution.
* @param {ol.TileCoord=} opt_tileCoord Destination ol.TileCoord object.
* @return {ol.TileCoord} Tile coordinate.
*/
ol.tilegrid.TileGrid.prototype.getTileCoordForCoordAndResolution = function(
coordinate, resolution, opt_tileCoord) {
return this.getTileCoordForXYAndResolution_(
coordinate[0], coordinate[1], resolution, false, opt_tileCoord);
};
/**
* @param {number} x X.
* @param {number} y Y.
* @param {number} resolution Resolution.
* @param {boolean} reverseIntersectionPolicy Instead of letting edge
* intersections go to the higher tile coordinate, let edge intersections
* go to the lower tile coordinate.
* @param {ol.TileCoord=} opt_tileCoord Temporary ol.TileCoord object.
* @return {ol.TileCoord} Tile coordinate.
* @private
*/
ol.tilegrid.TileGrid.prototype.getTileCoordForXYAndResolution_ = function(
x, y, resolution, reverseIntersectionPolicy, opt_tileCoord) {
var z = this.getZForResolution(resolution);
var scale = resolution / this.getResolution(z);
var origin = this.getOrigin(z);
var tileSize = this.getTileSize(z);
var tileCoordX = scale * (x - origin[0]) / (resolution * tileSize);
var tileCoordY = scale * (y - origin[1]) / (resolution * tileSize);
if (reverseIntersectionPolicy) {
tileCoordX = Math.ceil(tileCoordX) - 1;
tileCoordY = Math.ceil(tileCoordY) - 1;
} else {
tileCoordX = Math.floor(tileCoordX);
tileCoordY = Math.floor(tileCoordY);
}
return ol.TileCoord.createOrUpdate(z, tileCoordX, tileCoordY, opt_tileCoord);
};
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @param {number} z Z.
* @param {ol.TileCoord=} opt_tileCoord Destination ol.TileCoord object.
* @return {ol.TileCoord} Tile coordinate.
*/
ol.tilegrid.TileGrid.prototype.getTileCoordForCoordAndZ =
function(coordinate, z, opt_tileCoord) {
var resolution = this.getResolution(z);
return this.getTileCoordForXYAndResolution_(
coordinate[0], coordinate[1], resolution, false, opt_tileCoord);
};
/**
* @param {ol.TileCoord} tileCoord Tile coordinate.
* @return {number} Tile resolution.
*/
ol.tilegrid.TileGrid.prototype.getTileCoordResolution = function(tileCoord) {
goog.asserts.assert(
this.minZoom <= tileCoord.z && tileCoord.z <= this.maxZoom);
return this.resolutions_[tileCoord.z];
};
/**
* @param {number} z Z.
* @return {number} Tile size.
* @todo api
*/
ol.tilegrid.TileGrid.prototype.getTileSize = function(z) {
if (goog.isDef(this.tileSize_)) {
return this.tileSize_;
} else {
goog.asserts.assert(!goog.isNull(this.tileSizes_));
goog.asserts.assert(this.minZoom <= z && z <= this.maxZoom);
return this.tileSizes_[z];
}
};
/**
* @param {number} resolution Resolution.
* @return {number} Z.
*/
ol.tilegrid.TileGrid.prototype.getZForResolution = function(resolution) {
return ol.array.linearFindNearest(this.resolutions_, resolution, 0);
};
/**
* @param {ol.proj.Projection} projection Projection.
* @return {ol.tilegrid.TileGrid} Default tile grid for the passed projection.
*/
ol.tilegrid.getForProjection = function(projection) {
var tileGrid = projection.getDefaultTileGrid();
if (goog.isNull(tileGrid)) {
tileGrid = ol.tilegrid.createForProjection(projection);
projection.setDefaultTileGrid(tileGrid);
}
return tileGrid;
};
/**
* @param {ol.proj.Projection} projection Projection.
* @param {number=} opt_maxZoom Maximum zoom level.
* @param {number=} opt_tileSize Tile size.
* @return {ol.tilegrid.TileGrid} TileGrid instance.
*/
ol.tilegrid.createForProjection =
function(projection, opt_maxZoom, opt_tileSize) {
var projectionExtent = projection.getExtent();
var size = goog.isNull(projectionExtent) ?
360 * ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] /
projection.getMetersPerUnit() :
Math.max(projectionExtent[2] - projectionExtent[0],
projectionExtent[3] - projectionExtent[1]);
var maxZoom = goog.isDef(opt_maxZoom) ?
opt_maxZoom : ol.DEFAULT_MAX_ZOOM;
var tileSize = goog.isDef(opt_tileSize) ? opt_tileSize : ol.DEFAULT_TILE_SIZE;
var resolutions = new Array(maxZoom + 1);
var maxResolution = size / tileSize;
for (var z = 0, zz = resolutions.length; z < zz; ++z) {
resolutions[z] = maxResolution / Math.pow(2, z);
}
return new ol.tilegrid.TileGrid({
origin: goog.isNull(projectionExtent) ? [0, 0] :
ol.extent.getBottomLeft(projectionExtent),
resolutions: resolutions,
tileSize: tileSize
});
};
OpenLayers 3