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
145 lines (144 loc) • 6.33 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 distance_1 = __importDefault(require("@turf/distance"));
var intersect_1 = __importDefault(require("@turf/intersect"));
var helpers_1 = require("@turf/helpers");
/**
* Takes a bounding box and a cell depth and returns a set of triangular {@link Polygon|polygons} in a grid.
*
* @name triangleGrid
* @param {Array<number>} bbox extent in [minX, minY, maxX, maxY] order
* @param {number} cellSide dimension of each cell
* @param {Object} [options={}] Optional parameters
* @param {string} [options.units='kilometers'] used in calculating cellSide, can be degrees, radians, miles, or kilometers
* @param {Feature<Polygon>} [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>} grid of polygons
* @example
* var bbox = [-95, 30 ,-85, 40];
* var cellSide = 50;
* var options = {units: 'miles'};
*
* var triangleGrid = turf.triangleGrid(bbox, cellSide, options);
*
* //addToMap
* var addToMap = [triangleGrid];
*/
function triangleGrid(bbox, cellSide, options) {
if (options === void 0) { options = {}; }
// Containers
var results = [];
// Input Validation is being handled by Typescript
// if (cellSide === null || cellSide === undefined) throw new Error('cellSide is required');
// if (!isNumber(cellSide)) throw new Error('cellSide is invalid');
// if (!bbox) throw new Error('bbox is required');
// if (!Array.isArray(bbox)) throw new Error('bbox must be array');
// if (bbox.length !== 4) throw new Error('bbox must contain 4 numbers');
// if (mask && ['Polygon', 'MultiPolygon'].indexOf(getType(mask)) === -1) throw new Error('options.mask must be a (Multi)Polygon');
// Main
var xFraction = cellSide / distance_1.default([bbox[0], bbox[1]], [bbox[2], bbox[1]], options);
var cellWidth = xFraction * (bbox[2] - bbox[0]);
var yFraction = cellSide / distance_1.default([bbox[0], bbox[1]], [bbox[0], bbox[3]], options);
var cellHeight = yFraction * (bbox[3] - bbox[1]);
var xi = 0;
var currentX = bbox[0];
while (currentX <= bbox[2]) {
var yi = 0;
var currentY = bbox[1];
while (currentY <= bbox[3]) {
var cellTriangle1 = null;
var cellTriangle2 = null;
if (xi % 2 === 0 && yi % 2 === 0) {
cellTriangle1 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
cellTriangle2 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
}
else if (xi % 2 === 0 && yi % 2 === 1) {
cellTriangle1 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
cellTriangle2 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
}
else if (yi % 2 === 0 && xi % 2 === 1) {
cellTriangle1 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
cellTriangle2 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
}
else if (yi % 2 === 1 && xi % 2 === 1) {
cellTriangle1 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
cellTriangle2 = helpers_1.polygon([
[
[],
[],
[],
[],
],
], options.properties);
}
if (options.mask) {
if (intersect_1.default(options.mask, cellTriangle1))
results.push(cellTriangle1);
if (intersect_1.default(options.mask, cellTriangle2))
results.push(cellTriangle2);
}
else {
results.push(cellTriangle1);
results.push(cellTriangle2);
}
currentY += cellHeight;
yi++;
}
xi++;
currentX += cellWidth;
}
return helpers_1.featureCollection(results);
}
exports.default = triangleGrid;