adaguc-webmapjs/src/WMJSBBOX.js

Interactive maps library, capable of parsing a OGC WMS getcapabilities and display geographical layers

import { error } from './WMJSConstants.js';

/**
* WMJSBBOX Class
* Creates a WebMapJS bounding box based on 4 numeric values
* Creates a WebMapJS bounding box based on 1 string with commaseparated numeric values
* Creates a WebMapJS bounding box based on an exisiting WebMapJS bounding box.
* When no parameters are given, a global latlon bbox is generated.
* Author : MaartenPlieger (plieger at knmi.nl)
* Copyright KNMI
*/
export default class WMJSBBOX {
  constructor (left, bottom, right, top) {
    this.left = -180; // 0
    this.bottom = -90; // 1`
    this.right = 180; // 2
    this.top = 90; // 3
    this.clone = this.clone.bind(this);
    this.copy = this.copy.bind(this);
    this.setBBOX = this.setBBOX.bind(this);
    this.equals = this.equals.bind(this);
    this.toString = this.toString.bind(this);
    this.setBBOX(left, bottom, right, top);
  }

  /**
   * Clone an existing BBOX
   */
  clone (_bbox) {
    if (_bbox === undefined)_bbox = this;
    let bbox = new WMJSBBOX();
    bbox.left = _bbox.left;
    bbox.bottom = _bbox.bottom;
    bbox.right = _bbox.right;
    bbox.top = _bbox.top;
    return bbox;
  }

  copy (bbox) {
    this.setBBOX(bbox);
  }

  /**
  * setBBOX method, see class description for details.
  */
  setBBOX (left, bottom, right, top) {
    /* Make sure that left is defined, otherwise fill in defaults and leave */

    if (left === undefined || left === null) {
      this.left = -180; // 0
      this.bottom = -90; // 1`
      this.right = 180; // 2
      this.top = 90; // 3
      return;
    }
    /* Check if we recieve more than one parameter by checking the second bottom parameter. */
    if (!bottom) {
      /* Otherwise it can be a bbox object or a string in the form "left,bottom,right,top" */

      if (typeof (left) === 'object') {
        /* A bbox object is given, so it is not a string */
        let a = left;
        if (a.length === undefined || a.length === null) {
          left = a.left;
          bottom = a.bottom;
          right = a.right;
          top = a.top;
        } else {
          left = parseFloat(a[0]);
          bottom = parseFloat(a[1]);
          right = parseFloat(a[2]);
          top = parseFloat(a[3]);
        }
      } else {
        /* A string like "-180,-90,180,90" is given */
        try {
          let a = left.split(',');
          if (a.length !== 4)error("Invalid map bounding box: '" + left + "'");
          left = parseFloat(a[0]);
          bottom = parseFloat(a[1]);
          right = parseFloat(a[2]);
          top = parseFloat(a[3]);
        } catch (e) {
        }
      }
    }
    /* Some safety checks on obtained values... */
    if (left === undefined || bottom === undefined || right === undefined || top === undefined ||
        left === null || bottom === null || right === null || top === null) {
      if (left === undefined)left = -180;
      if (right === undefined)right = 180;
      if (bottom === undefined)bottom = -90;
      if (top === undefined)top = 90;
    }
    /* Assign values to the bbox object */
    this.left = left;
    this.bottom = bottom;
    this.right = right;
    this.top = top;
  }

  /*
   * Compares two boundingboxes and returns true if they are equal
   */
  equals (bbox, bottom, right, top) {
    if (!bbox) {
      return false;
    }
    if (bottom !== undefined) {
      if (this.left === bbox && this.right === right && this.top === top && this.bottom === bottom) {
        return true;
      }
    }
    if (typeof (bbox) === 'object') {
      if (this.left === bbox.left && this.right === bbox.right && this.top === bbox.top && this.bottom === bbox.bottom) {
        return true;
      }
    } else {
      let a = bbox.split(',');
      if (a.length !== 4) console.log('Invalid map bounding box: ' + bbox);
      let left = parseFloat(a[0]);
      bottom = parseFloat(a[1]);
      right = parseFloat(a[2]);
      top = parseFloat(a[3]);
      let matches = 0;
      if (this.left === left) matches++;
      if (this.right === right) matches++;
      if (this.top === top) matches++;
      if (this.bottom === bottom) matches++;

      if (matches >= 2) {
        return true;
      }
    }
    return false;
  }

  /**
   * Returns the current BBOX as a string, useful for generating WMS requests.
   */
  toString () {
    return (this.left + ',' + this.bottom + ',' + this.right + ',' + this.top);
  }
};