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simplify slope segment

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vcoppe
2024-06-28 18:40:43 +02:00
parent f2014f53a1
commit cbc5c05807
3 changed files with 11 additions and 17 deletions
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6
gpx/src/gpx.ts
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@@ -692,10 +692,6 @@ export class TrackSegment extends GPXTreeLeaf {
}
_computeSlopeSegments(statistics: GPXStatistics): [number[], number[]] {
function canSplit(point1: TrackPoint, point2: TrackPoint, point3: TrackPoint): boolean {
return statistics.local.distance.total[point3._data.index] - statistics.local.distance.total[point1._data.index] >= 0.5 && statistics.local.distance.total[point2._data.index] - statistics.local.distance.total[point3._data.index] >= 0.5;
}
// x-coordinates are given by: statistics.local.distance.total[point._data.index] * 1000
// y-coordinates are given by: point.ele
// Compute the distance between point3 and the line defined by point1 and point2
@@ -718,7 +714,7 @@ export class TrackSegment extends GPXTreeLeaf {
return Math.abs((y2 - y1) * x3 - (x2 - x1) * y3 + x2 * y1 - y2 * x1) / dist;
}
let simplified = ramerDouglasPeucker(this.trkpt, 25, elevationDistance, canSplit);
let simplified = ramerDouglasPeucker(this.trkpt, 20, elevationDistance);
let slope = [];
let length = [];

20
gpx/src/simplify.ts
View File

@@ -5,7 +5,7 @@ export type SimplifiedTrackPoint = { point: TrackPoint, distance?: number };
const earthRadius = 6371008.8;
export function ramerDouglasPeucker(points: readonly TrackPoint[], epsilon: number = 50, measure: (a: TrackPoint, b: TrackPoint, c: TrackPoint) => number = computeCrossarc, canSplit: (a: TrackPoint, b: TrackPoint, c: TrackPoint) => boolean = () => true): SimplifiedTrackPoint[] {
export function ramerDouglasPeucker(points: readonly TrackPoint[], epsilon: number = 50, measure: (a: TrackPoint, b: TrackPoint, c: TrackPoint) => number = computeCrossarc): SimplifiedTrackPoint[] {
if (points.length == 0) {
return [];
} else if (points.length == 1) {
@@ -17,33 +17,31 @@ export function ramerDouglasPeucker(points: readonly TrackPoint[], epsilon: numb
let simplified = [{
point: points[0]
}];
ramerDouglasPeuckerRecursive(points, epsilon, measure, canSplit, 0, points.length - 1, simplified);
ramerDouglasPeuckerRecursive(points, epsilon, measure, 0, points.length - 1, simplified);
simplified.push({
point: points[points.length - 1]
});
return simplified;
}
function ramerDouglasPeuckerRecursive(points: readonly TrackPoint[], epsilon: number, measure: (a: TrackPoint, b: TrackPoint, c: TrackPoint) => number, canSplit: (a: TrackPoint, b: TrackPoint, c: TrackPoint) => boolean, start: number, end: number, simplified: SimplifiedTrackPoint[]) {
function ramerDouglasPeuckerRecursive(points: readonly TrackPoint[], epsilon: number, measure: (a: TrackPoint, b: TrackPoint, c: TrackPoint) => number, start: number, end: number, simplified: SimplifiedTrackPoint[]) {
let largest = {
index: 0,
distance: 0
};
for (let i = start + 1; i < end; i++) {
if (canSplit(points[start], points[end], points[i])) {
let distance = measure(points[start], points[end], points[i]);
if (distance > largest.distance) {
largest.index = i;
largest.distance = distance;
}
let distance = measure(points[start], points[end], points[i]);
if (distance > largest.distance) {
largest.index = i;
largest.distance = distance;
}
}
if (largest.distance > epsilon && largest.index != 0) {
ramerDouglasPeuckerRecursive(points, epsilon, measure, canSplit, start, largest.index, simplified);
ramerDouglasPeuckerRecursive(points, epsilon, measure, start, largest.index, simplified);
simplified.push({ point: points[largest.index], distance: largest.distance });
ramerDouglasPeuckerRecursive(points, epsilon, measure, canSplit, largest.index, end, simplified);
ramerDouglasPeuckerRecursive(points, epsilon, measure, largest.index, end, simplified);
}
}

2
website/src/lib/components/ElevationProfile.svelte
View File

@@ -434,7 +434,7 @@
let hue = ((0.5 - v) * 120).toString(10);
let lightness = 90 - Math.abs(v) * 70;
return ['hsl(', hue, ',60%,', lightness, '%)'].join('');
return ['hsl(', hue, ',70%,', lightness, '%)'].join('');
}
function surfaceFillCallback(context) {