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improve performance of reverse

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This commit is contained in:
vcoppe
2024-05-16 10:41:49 +02:00
parent 19e21d656f
commit c6ce51d0c1
1 changed files with 31 additions and 12 deletions
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43
gpx/src/gpx.ts
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@@ -1,5 +1,5 @@
import { Coordinates, GPXFileAttributes, GPXFileType, Link, Metadata, TrackExtensions, TrackPointExtensions, TrackPointType, TrackSegmentType, TrackType, WaypointType } from "./types";
import { Draft, immerable, produce } from "immer";
import { Draft, immerable, isDraft, original, produce, freeze } from "immer";
function cloneJSON<T>(obj: T): T {
if (obj === null || typeof obj !== 'object') {
@@ -72,15 +72,16 @@ abstract class GPXTreeNode<T extends GPXTreeElement<any>> extends GPXTreeElement
reverse(originalNextTimestamp?: Date, newPreviousTimestamp?: Date) {
return produce(this, (draft: Draft<GPXTreeNode<T>>) => {
let og = getOriginal(draft);
if (!originalNextTimestamp && !newPreviousTimestamp) {
originalNextTimestamp = draft.children[draft.children.length - 1].getEndTimestamp();
newPreviousTimestamp = draft.children[0].getStartTimestamp();
originalNextTimestamp = og.children[og.children.length - 1].getEndTimestamp();
newPreviousTimestamp = og.children[0].getStartTimestamp();
}
draft.children.reverse();
for (let i = 0; i < draft.children.length; i++) {
let originalStartTimestamp = draft.children[i].getStartTimestamp();
for (let i = 0; i < og.children.length; i++) {
let originalStartTimestamp = og.children[og.children.length - i - 1].getStartTimestamp();
draft.children[i] = draft.children[i].reverse(originalNextTimestamp, newPreviousTimestamp);
@@ -417,18 +418,29 @@ export class TrackSegment extends GPXTreeLeaf {
reverse(originalNextTimestamp?: Date, newPreviousTimestamp?: Date) {
return produce(this, (draft) => {
if (originalNextTimestamp !== undefined && newPreviousTimestamp !== undefined) {
let originalEndTimestamp = draft.getEndTimestamp();
let og = getOriginal(draft); // Read as much as possible from the original object because it is faster
let originalEndTimestamp = og.getEndTimestamp();
let newStartTimestamp = new Date(
newPreviousTimestamp.getTime() + originalNextTimestamp.getTime() - originalEndTimestamp.getTime()
);
for (let i = 0; i < draft.trkpt.length; i++) {
draft.trkpt[i].time = new Date(
newStartTimestamp.getTime() + (originalEndTimestamp.getTime() - draft.trkpt[i].time.getTime())
);
}
let trkpt = og.trkpt.map((point, i) => new TrackPoint({
attributes: cloneJSON(point.attributes),
ele: point.ele,
time: new Date(
newStartTimestamp.getTime() + (originalEndTimestamp.getTime() - og.trkpt[i].time.getTime())
),
extensions: cloneJSON(point.extensions),
_data: cloneJSON(point._data),
}));
trkpt.reverse();
draft.trkpt = freeze(trkpt); // Pre-freeze the array, faster as well
} else {
draft.trkpt.reverse();
}
draft.trkpt.reverse();
});
}
};
@@ -721,4 +733,11 @@ function distanceWindowSmoothing(points: ReadonlyArray<Readonly<TrackPoint>>, di
function distanceWindowSmoothingWithDistanceAccumulator(points: ReadonlyArray<Readonly<TrackPoint>>, distanceWindow: number, compute: (accumulated: number, start: number, end: number) => number): number[] {
return distanceWindowSmoothing(points, distanceWindow, (index) => index > 0 ? distance(points[index - 1].getCoordinates(), points[index].getCoordinates()) : 0, compute, (index) => distance(points[index].getCoordinates(), points[index + 1].getCoordinates()));
}
function getOriginal(obj: any): any {
while (isDraft(obj)) {
obj = original(obj);
}
return obj;
}