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
58 lines • 2.15 kB
JavaScript
// index.js
import { bearing } from "@turf/bearing";
import { distance } from "@turf/distance";
import { destination } from "@turf/destination";
import { lineString, isObject } from "@turf/helpers";
function lineSliceAlong(line, startDist, stopDist, options) {
options = options || {};
if (!isObject(options)) throw new Error("options is invalid");
var coords;
var slice = [];
if (line.type === "Feature") coords = line.geometry.coordinates;
else if (line.type === "LineString") coords = line.coordinates;
else throw new Error("input must be a LineString Feature or Geometry");
var origCoordsLength = coords.length;
var travelled = 0;
var overshot, direction, interpolated;
for (var i = 0; i < coords.length; i++) {
if (startDist >= travelled && i === coords.length - 1) break;
else if (travelled > startDist && slice.length === 0) {
overshot = startDist - travelled;
if (!overshot) {
slice.push(coords[i]);
return lineString(slice);
}
direction = bearing(coords[i], coords[i - 1]) - 180;
interpolated = destination(coords[i], overshot, direction, options);
slice.push(interpolated.geometry.coordinates);
}
if (travelled >= stopDist) {
overshot = stopDist - travelled;
if (!overshot) {
slice.push(coords[i]);
return lineString(slice);
}
direction = bearing(coords[i], coords[i - 1]) - 180;
interpolated = destination(coords[i], overshot, direction, options);
slice.push(interpolated.geometry.coordinates);
return lineString(slice);
}
if (travelled >= startDist) {
slice.push(coords[i]);
}
if (i === coords.length - 1) {
return lineString(slice);
}
travelled += distance(coords[i], coords[i + 1], options);
}
if (travelled < startDist && coords.length === origCoordsLength)
throw new Error("Start position is beyond line");
var last = coords[coords.length - 1];
return lineString([last, last]);
}
var turf_line_slice_along_default = lineSliceAlong;
export {
turf_line_slice_along_default as default,
lineSliceAlong
};
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