terriajs/lib/Map/Vector/unionRectangles.js

Geospatial data visualization platform.

"use strict";

var defined = require("terriajs-cesium/Source/Core/defined").default;
var DeveloperError =
  require("terriajs-cesium/Source/Core/DeveloperError").default;
var Rectangle = require("terriajs-cesium/Source/Core/Rectangle").default;

/**
 * Computes the union of two rectangles.  This function is not 180-meridian safe.
 * @param {Rectangle} first The first rectangle to union.
 * @param {Rectangle} second The second rectangle to union.
 * @param {Rectangle} [result] The existing {@link Rectangle} to which to copy the result instead of creating and returning a new instance.
 * @return {Rectangle} The union of the two rectangles.
 */
var unionRectangles = function (first, second, result) {
  if (!defined(first)) {
    throw new DeveloperError("first is required");
  }
  if (!defined(second)) {
    throw new DeveloperError("second is required");
  }

  var west = Math.min(first.west, second.west);
  var south = Math.min(first.south, second.south);
  var east = Math.max(first.east, second.east);
  var north = Math.max(first.north, second.north);

  if (!defined(result)) {
    result = new Rectangle(west, south, east, north);
  } else {
    result.west = west;
    result.south = south;
    result.east = east;
    result.north = north;
  }

  return result;
};

module.exports = unionRectangles;