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Embed points to routing graph in projected space #161

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Embed points to routing graph in projected space #161

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21 changes: 13 additions & 8 deletions src/pathfinding/PathfinderProvider.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -232,13 +232,17 @@ export default class PathfinderProvider {

private segmentDistToPoint(segA: ILocation, segB: ILocation, p: ILocation): number {
// potential 'catastrophic cancellation'
const sx1 = segA.longitude;
const sx2 = segB.longitude;
const px = p.longitude;
const mSegA = proj4("EPSG:4326", "EPSG:3857", [segA.longitude, segA.latitude]);
const mSegB = proj4("EPSG:4326", "EPSG:3857", [segB.longitude, segB.latitude]);
const mP = proj4("EPSG:4326", "EPSG:3857", [p.longitude, p.latitude]);

const sy1 = segA.latitude;
const sy2 = segB.latitude;
const py = p.latitude;
const sx1 = mSegA[0];
const sx2 = mSegB[0];
const px = mP[0];

const sy1 = mSegA[1];
const sy2 = mSegB[1];
const py = mP[1];

const px2 = sx2 - sx1; // <-
const py2 = sy2 - sy1; // <-
Expand All @@ -261,9 +265,10 @@ export default class PathfinderProvider {
const x = sx1 + u * px2;
const y = sy1 + u * py2;

const intersection = proj4("EPSG:3857", "EPSG:4326", [x, y]);
const result = {
longitude: x,
latitude: y,
longitude: intersection[0],
latitude: intersection[1],
};

const dist = Geo.getDistanceBetweenLocations(p, result);
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