terriajs/lib/Map/Vector/unionRectangleArray.js

Geospatial data visualization platform.

"use strict";

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

/**
 * Computes the union of an array of rectangles.  This function is not 180-meridian safe.
 * @param  {Rectangle[]} rectangles The array of rectangles to union.
 * @return {Rectangle} The union of the rectangles, or undefined if the array of rectangles is empty.
 */
var unionRectangleArray = function (rectangles) {
  var result;
  for (var i = 0; i < rectangles.length; ++i) {
    if (!defined(rectangles[i])) {
      continue;
    }

    if (!defined(result)) {
      result = Rectangle.clone(rectangles[i]);
    } else {
      var rectangle = rectangles[i];
      if (defined(rectangle)) {
        result = unionRectangles(result, rectangle, result);
      }
    }
  }

  return result;
};

module.exports = unionRectangleArray;