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Replaced logic to find nearest segment with turf.nearestPointOnLine()

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More accurate on routes that are shaped like an 'U' for whatever reason.
This commit is contained in:
Tobias 2022-11-02 20:00:55 +01:00
parent f2d034ce8a
commit aae95877b6
1 changed files with 9 additions and 19 deletions
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28
js/control/TrackMessages.js
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@ -241,32 +241,22 @@ BR.TrackMessages = L.Class.extend({
// 1.1 meters of a point on the chart (there are 111,111 meters in a degree)
const exactMatchRounding = 1.1 / 111111;
let idx = 0;
const point = turf.point([evt.latlng.lng, evt.latlng.lat]);
let idxOffset = 0;
outer: for (let segment of this.segments) {
for (let coord of segment.feature.geometry.coordinates) {
let latDiff = evt.latlng.lat - coord[1];
let lngDiff = evt.latlng.lng - coord[0];
// first check for an almost exact match; it's simple and avoid further calculations
if (Math.abs(latDiff) < exactMatchRounding && Math.abs(lngDiff) < exactMatchRounding) {
closestPointIdx = idx;
break outer;
}
// calculate the squared distance from the current to the given;
// it's the squared distance, to avoid the expensive square root
const distance = Math.pow(latDiff, 2) + Math.pow(lngDiff, 2);
if (distance < closestDistance) {
closestPointIdx = idx;
closestDistance = distance;
}
idx++;
const bestPointForSegement = turf.nearestPointOnLine(segment.feature, point);
if (bestPointForSegement.properties.dist < closestDistance) {
closestPointIdx = idxOffset + bestPointForSegement.properties.index;
closestDistance = bestPointForSegement.properties.dist;
}
idxOffset += segment.feature.geometry.coordinates.length;
}
if (closestPointIdx) {
if (closestPointIdx !== null) {
// Now map point to next data row
let rowIdx = -1;
for (let i = 0; i < this.trackEdges.edges.length; i++) {
if (closestPointIdx <= this.trackEdges.edges[i]) {
if (closestPointIdx < this.trackEdges.edges[i]) {
rowIdx = i;
break;
}