node-red-contrib-tak-registration
Version:
A Node-RED node to register to TAK and to help wrap files as datapackages to send to TAK
83 lines (82 loc) • 3.45 kB
JavaScript
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var boolean_intersects_1 = __importDefault(require("@turf/boolean-intersects"));
var distance_1 = __importDefault(require("@turf/distance"));
var helpers_1 = require("@turf/helpers");
/**
* Creates a grid of rectangles from a bounding box, {@link Feature} or {@link FeatureCollection}.
*
* @name rectangleGrid
* @param {Array<number>} bbox extent in [minX, minY, maxX, maxY] order
* @param {number} cellWidth of each cell, in units
* @param {number} cellHeight of each cell, in units
* @param {Object} [options={}] Optional parameters
* @param {string} [options.units='kilometers'] units ("degrees", "radians", "miles", "kilometers") that the given cellWidth
* and cellHeight are expressed in. Converted at the southern border.
* @param {Feature<Polygon|MultiPolygon>} [options.mask] if passed a Polygon or MultiPolygon,
* the grid Points will be created only inside it
* @param {Object} [options.properties={}] passed to each point of the grid
* @returns {FeatureCollection<Polygon>} a grid of polygons
* @example
* var bbox = [-95, 30 ,-85, 40];
* var cellWidth = 50;
* var cellHeight = 20;
* var options = {units: 'miles'};
*
* var rectangleGrid = turf.rectangleGrid(bbox, cellWidth, cellHeight, options);
*
* //addToMap
* var addToMap = [rectangleGrid]
*/
function rectangleGrid(bbox, cellWidth, cellHeight, options) {
if (options === void 0) { options = {}; }
// Containers
var results = [];
var west = bbox[0];
var south = bbox[1];
var east = bbox[2];
var north = bbox[3];
var xFraction = cellWidth / distance_1.default([west, south], [east, south], options);
var cellWidthDeg = xFraction * (east - west);
var yFraction = cellHeight / distance_1.default([west, south], [west, north], options);
var cellHeightDeg = yFraction * (north - south);
// rows & columns
var bboxWidth = east - west;
var bboxHeight = north - south;
var columns = Math.floor(bboxWidth / cellWidthDeg);
var rows = Math.floor(bboxHeight / cellHeightDeg);
// if the grid does not fill the bbox perfectly, center it.
var deltaX = (bboxWidth - columns * cellWidthDeg) / 2;
var deltaY = (bboxHeight - rows * cellHeightDeg) / 2;
// iterate over columns & rows
var currentX = west + deltaX;
for (var column = 0; column < columns; column++) {
var currentY = south + deltaY;
for (var row = 0; row < rows; row++) {
var cellPoly = helpers_1.polygon([
[
[currentX, currentY],
[currentX, currentY + cellHeightDeg],
[currentX + cellWidthDeg, currentY + cellHeightDeg],
[currentX + cellWidthDeg, currentY],
[currentX, currentY],
],
], options.properties);
if (options.mask) {
if (boolean_intersects_1.default(options.mask, cellPoly)) {
results.push(cellPoly);
}
}
else {
results.push(cellPoly);
}
currentY += cellHeightDeg;
}
currentX += cellWidthDeg;
}
return helpers_1.featureCollection(results);
}
exports.default = rectangleGrid;