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
105 lines (104 loc) • 3.97 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var invariant_1 = require("@turf/invariant");
/**
* Returns true if a point is on a line. Accepts a optional parameter to ignore the
* start and end vertices of the linestring.
*
* @name booleanPointOnLine
* @param {Coord} pt GeoJSON Point
* @param {Feature<LineString>} line GeoJSON LineString
* @param {Object} [options={}] Optional parameters
* @param {boolean} [options.ignoreEndVertices=false] whether to ignore the start and end vertices.
* @param {number} [options.epsilon] Fractional number to compare with the cross product result. Useful for dealing with floating points such as lng/lat points
* @returns {boolean} true/false
* @example
* var pt = turf.point([0, 0]);
* var line = turf.lineString([[-1, -1],[1, 1],[1.5, 2.2]]);
* var isPointOnLine = turf.booleanPointOnLine(pt, line);
* //=true
*/
function booleanPointOnLine(pt, line, options) {
if (options === void 0) { options = {}; }
// Normalize inputs
var ptCoords = invariant_1.getCoord(pt);
var lineCoords = invariant_1.getCoords(line);
// Main
for (var i = 0; i < lineCoords.length - 1; i++) {
var ignoreBoundary = false;
if (options.ignoreEndVertices) {
if (i === 0) {
ignoreBoundary = "start";
}
if (i === lineCoords.length - 2) {
ignoreBoundary = "end";
}
if (i === 0 && i + 1 === lineCoords.length - 1) {
ignoreBoundary = "both";
}
}
if (isPointOnLineSegment(lineCoords[i], lineCoords[i + 1], ptCoords, ignoreBoundary, typeof options.epsilon === "undefined" ? null : options.epsilon)) {
return true;
}
}
return false;
}
// See http://stackoverflow.com/a/4833823/1979085
// See https://stackoverflow.com/a/328122/1048847
/**
* @private
* @param {Position} lineSegmentStart coord pair of start of line
* @param {Position} lineSegmentEnd coord pair of end of line
* @param {Position} pt coord pair of point to check
* @param {boolean|string} excludeBoundary whether the point is allowed to fall on the line ends.
* @param {number} epsilon Fractional number to compare with the cross product result. Useful for dealing with floating points such as lng/lat points
* If true which end to ignore.
* @returns {boolean} true/false
*/
function isPointOnLineSegment(lineSegmentStart, lineSegmentEnd, pt, excludeBoundary, epsilon) {
var x = pt[0];
var y = pt[1];
var x1 = lineSegmentStart[0];
var y1 = lineSegmentStart[1];
var x2 = lineSegmentEnd[0];
var y2 = lineSegmentEnd[1];
var dxc = pt[0] - x1;
var dyc = pt[1] - y1;
var dxl = x2 - x1;
var dyl = y2 - y1;
var cross = dxc * dyl - dyc * dxl;
if (epsilon !== null) {
if (Math.abs(cross) > epsilon) {
return false;
}
}
else if (cross !== 0) {
return false;
}
if (!excludeBoundary) {
if (Math.abs(dxl) >= Math.abs(dyl)) {
return dxl > 0 ? x1 <= x && x <= x2 : x2 <= x && x <= x1;
}
return dyl > 0 ? y1 <= y && y <= y2 : y2 <= y && y <= y1;
}
else if (excludeBoundary === "start") {
if (Math.abs(dxl) >= Math.abs(dyl)) {
return dxl > 0 ? x1 < x && x <= x2 : x2 <= x && x < x1;
}
return dyl > 0 ? y1 < y && y <= y2 : y2 <= y && y < y1;
}
else if (excludeBoundary === "end") {
if (Math.abs(dxl) >= Math.abs(dyl)) {
return dxl > 0 ? x1 <= x && x < x2 : x2 < x && x <= x1;
}
return dyl > 0 ? y1 <= y && y < y2 : y2 < y && y <= y1;
}
else if (excludeBoundary === "both") {
if (Math.abs(dxl) >= Math.abs(dyl)) {
return dxl > 0 ? x1 < x && x < x2 : x2 < x && x < x1;
}
return dyl > 0 ? y1 < y && y < y2 : y2 < y && y < y1;
}
return false;
}
exports.default = booleanPointOnLine;