/*
* Copyright 2003-2006, 2009, 2017, 2020 United States Government, as represented
* by the Administrator of the National Aeronautics and Space Administration.
* All rights reserved.
*
* The NASAWorldWind/WebWorldWind platform is licensed under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License
* at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* NASAWorldWind/WebWorldWind also contains the following 3rd party Open Source
* software:
*
* ES6-Promise – under MIT License
* libtess.js – SGI Free Software License B
* Proj4 – under MIT License
* JSZip – under MIT License
*
* A complete listing of 3rd Party software notices and licenses included in
* WebWorldWind can be found in the WebWorldWind 3rd-party notices and licenses
* PDF found in code directory.
*/
/**
* @exports TileMatrixSet
*/
define([
'../error/ArgumentError',
'../util/Logger',
'../geom/Sector',
'../geom/TileMatrix'
],
function (ArgumentError,
Logger,
Sector,
TileMatrix) {
"use strict";
/**
* TileMatrixSet defines a generic tiled space as defined by a geographic bounding area and an array of
* TileMatrix objects which define the tiled space at different resolutions.
* @param sector the geographic bounding area of this TileMatrixSet
* @param tileMatrixList the array of TileMatrix objects forming this TileMatrixSet
* @constructor
*/
var TileMatrixSet = function (sector, tileMatrixList) {
if (!sector) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "constructor", "missingSector"));
}
if (!tileMatrixList) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "constructor",
"The specified TileMatrix list is null or undefined."));
}
/**
* The geographic coverage of this TileMatrixSet.
*/
this.sector = sector;
/**
* An array of TileMatrix objects defining this TileMatrixSet.
*/
this.entries = tileMatrixList;
};
/**
* Create a TileMatrixSet based on a quad division technique given the provided initial starting conditions.
* @param sector the geographic bounding area of the TileMatrixSet
* @param matrixWidth the number of tiles in the x direction at the initial level
* @param matrixHeight the number of tiles in the y direction at the initial level
* @param tileWidth the number of pixels or points in the x direction of a tile
* @param tileHeight the number of pixels or points in the y direction of a tile
* @param numLevels the number of resolution levels this TileMatrixSet should contain
* @returns {TileMatrixSet} fully configured TileMatrixSet
*/
TileMatrixSet.fromTilePyramid = function (sector, matrixWidth, matrixHeight, tileWidth, tileHeight, numLevels) {
if (!sector) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "fromTilePyramid", "missingSector"));
}
if (matrixWidth < 1) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "fromTilePyramid", "invalidWidth"));
}
if (matrixHeight < 1) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "fromTilePyramid", "invalidHeight"));
}
if (tileWidth < 1) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "fromTilePyramid", "invalidWidth"));
}
if (tileHeight < 1) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "fromTilePyramid", "invalidHeight"));
}
if (numLevels < 1) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "fromTilePyramid",
"The specified number of levels is invalid"));
}
var tileMatrices = [], matrix, idx;
for (idx = 0; idx < numLevels; idx++) {
matrix = new TileMatrix(sector, matrixWidth, matrixHeight, tileWidth, tileHeight);
tileMatrices.push(matrix);
matrixWidth *= 2;
matrixHeight *= 2;
}
return new TileMatrixSet(sector, tileMatrices);
};
/**
* Determines the index of the TileMatrix with the closest resolution to the provided value.
* @param degreesPerPixel the target resolution
* @returns {number} the index of the TileMatrix within this TileMatrixSet's entries array
*/
TileMatrixSet.prototype.indexOfMatrixNearest = function (degreesPerPixel) {
if (degreesPerPixel <= 0) {
throw new ArgumentError(
Logger.logMessage(Logger.LEVEL_SEVERE, "TileMatrixSet", "indexOfMatrixNearest",
"The specified resolution is invalid"));
}
var nearestIdx = -1, nearestDelta2 = Number.MAX_VALUE, delta, delta2;
for (var idx = 0, len = this.entries.length; idx < len; idx++) {
delta = (this.entries[idx].degreesPerPixel - degreesPerPixel);
delta2 = delta * delta;
if (nearestDelta2 > delta2) {
nearestDelta2 = delta2;
nearestIdx = idx;
}
}
return nearestIdx;
};
return TileMatrixSet;
});