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nanomap
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feat: shortest path (plain implementation)

This commit is contained in:
arielherself 2023-12-25 00:06:07 +08:00
parent 5eeb2aea42
commit ed568f3572
10 changed files with 12044 additions and 76 deletions
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1
.babelrc Normal file
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@ -0,0 +1 @@
{ "presets": ["@babel/preset-flow"] }

6
.idea/misc.xml Normal file
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@ -0,0 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="JavaScriptSettings">
<option name="languageLevel" value="ES6" />
</component>
</project>

45
.idea/workspace.xml
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@ -5,6 +5,13 @@
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<component name="ChangeListManager">
<list default="true" id="3c7078e7-6f30-4d92-9696-11496f9e6dff" name="Changes" comment="">
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158
api/click.js
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@ -1,19 +1,167 @@
import {post} from "../src/Networking";
import {MinPriorityQueue} from "@datastructures-js/priority-queue";
function haversine_distance(p1,p2) {
const toRadians = (degrees) => {
return degrees * Math.PI / 180;
};
const [lat1, lon1] = p1;
const [lat2, lon2] = p2;
const R = 6371;
const dLat = toRadians(lat2 - lat1);
const dLon = toRadians(lon2 - lon1);
const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos(toRadians(lat1)) * Math.cos(toRadians(lat2)) *
Math.sin(dLon / 2) * Math.sin(dLon / 2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
if (R * c < 0) console.log("WARNING!!!");
return R * c;
}
function find_nearest_node_id(nodes, point) {
const [lat, lon] = point;
let min_distance = 1e100;
let res = 0;
for (let node_id in nodes) {
const curr_distance = haversine_distance(nodes[node_id], point);
if (curr_distance < min_distance) {
min_distance = curr_distance;
res = node_id;
}
}
return res;
}
function __spa(nodes, ch, u, p) {
console.log(`node count: ${Object.keys(nodes).length}`);
const weight_cache = {};
try {
const get_weight = (n1, n2) => {
const tup = [n1, n2];
if (weight_cache[tup]) {
return weight_cache[[n1, n2]];
}
// console.log("21");
// console.log(`${nodes[n1]} ${nodes[n2]}`);
weight_cache[tup] = haversine_distance(nodes[n1], nodes[n2]);
return weight_cache[tup];
};
const dis = {};
const fa = {};
const vis = new Set();
const pq = new MinPriorityQueue();
// console.log(`nodes: ${JSON.stringify(nodes)}`);
dis[u] = 0;
pq.push([0, u]);
while (!pq.isEmpty()) {
const [d, v] = pq.pop();
if (vis.has(v) || !ch[v]) continue;
vis.add(v);
const t = ch[v].length;
for (let j = 0; j < t; ++j) {
const c = ch[v][j];
if (!nodes[c]) continue;
const w = get_weight(v, c);
if (!dis[c] || d + w < dis[c]) {
dis[c] = d + w;
pq.push([dis[c], c]);
fa[c] = v;
}
}
}
// console.log(`fa = ${JSON.stringify(fa)}`);
let curr = p;
const res = [p];
// console.log(JSON.stringify(p));
vis.clear();
while (fa[curr]) {
// console.log(JSON.stringify(curr));
curr = fa[curr].toString();
if(vis.has(curr)) {
console.log(`Cycle at ${curr}`);
break;
}
vis.add(curr);
res.push(curr);
}
console.log("finished __spa.");
// console.log(JSON.stringify(res));
return res;
} catch (e) {
console.log(e);
}
}
function shortest_path(nodes, ways, start_point, end_point){
try { // console.log(`Calling shortest_path(${nodes},${ways},${start_point},${end_point})`);
const ch_dict = {};
for (const way_id in ways) {
const l = ways[way_id];
const n = l.length;
for (let i = 1; i < n; ++i) {
if (ch_dict[l[i]]) {
ch_dict[l[i]].push(l[i - 1]);
} else {
ch_dict[l[i]] = [l[i - 1]];
}
if (ch_dict[l[i - 1]]) {
ch_dict[l[i - 1]].push(l[i]);
} else {
ch_dict[l[i - 1]] = [l[i]];
}
}
}
// console.log(ch_dict);
const clean_nodes = {};
Object.keys(nodes).forEach((node_id) => {
if (ch_dict[node_id]) clean_nodes[node_id] = nodes[node_id];
});
const actual_start_node_id = find_nearest_node_id(clean_nodes, start_point);
const actual_end_node_id = find_nearest_node_id(clean_nodes, end_point);
console.log("calling __spa...");
const seq = __spa(clean_nodes, ch_dict, actual_start_node_id, actual_end_node_id);
const res = [end_point];
seq.forEach((node_id) => {
if (clean_nodes[node_id]) res.push(clean_nodes[node_id]);
});
res.push(start_point);
return res;
} catch (e) {
console.log(e);
}
}
export default function handler(req,res){
const pts=JSON.parse(req.body);
const latRange=pts.map((row)=>row[0]),
lonRange=pts.map((row)=>row[1]);
const minlon=Math.min(...lonRange),minlat=Math.min(...latRange),
maxlon=Math.max(...lonRange),maxlat=Math.max(...latRange);
const request_uri=`https://www.overpass-api.de/api/interpreter?data=[out:json];node[highway](${minlat},${minlon},${maxlat},${maxlon});out;`;
const minlon=Math.min(...lonRange) - 0.01,minlat=Math.min(...latRange) - 0.01,
maxlon=Math.max(...lonRange) + 0.01,maxlat=Math.max(...latRange) + 0.01;
// console.log(`1+1`);
const request_uri=`https://www.overpass-api.de/api/interpreter?data=[out:json];way[highway](${minlat},${minlon},${maxlat},${maxlon});(._;>;);out body;`;
console.log(`Requesting ${request_uri}`);
const fetch_debug_response= fetch(request_uri).then((response)=>{
return response.json();
});
fetch_debug_response.then((debug_response)=>{
console.log(debug_response);
let ps = {};
let ws = {};
debug_response.elements.forEach((it)=> {
if (it.type === "node") {
ps[it.id] = [it.lat,it.lon];
} else if (it.type === "way") {
ws[it.id] = it.nodes;
}
});
// console.log(`pts[0]: ${pts[0]}`);
const path_found = shortest_path(ps,ws,pts[0],pts[pts.length - 1]);
// const path_found = [];
// console.log(JSON.stringify(path_found));
res.status(200).json({
log: `Method: click\nArgs: ${pts}\nStatus: requested "${request_uri}", got response ${JSON.stringify(debug_response.elements)}`,
multipolyline: JSON.stringify(pts),
multipolyline: JSON.stringify(path_found),
// __debug_pts: ps
});
}).catch(e=>{
res.status(500);

9
api/handshake.js
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@ -1,11 +1,8 @@
const __DEBUG__=1,
__APP_VERSION__='v0.1.2a',
__APP_VERSION__='v0.1.3a',
__APP_INTRO__=`
<b>Relocating Support</b>
Can't find where you are from? We now memorize the last location you visited. Tap the "Relocate" button to find your way home.<br>
<b>Nearby Search</b>
You can first locate a general area and schedule detailed travel plan later. Tap the magnifier/gear icon to toggle between Nearby Search mode and Global Search mode.
<i>This update also includes several stability and UI improvements.</i>
<b>Right way to follow.</b><br>
In this update you can find a shortest route for any given start and destination.<br>
`;
export default function handler(req,res){

11667
example/interpreter.json Normal file
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217
package-lock.json generated
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@ -1,13 +1,14 @@
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"integrity": "sha512-hOOqoiNXrmGdFbhgCzu6GiURxUgM27Xwd/aPuu8RfHEZPBzL1Z54okAHAQjXfcQNwvrlkAmAp4SlRTZ45vlthQ==",
"bin": {
"parser": "bin/babel-parser.js"
},
@ -1899,6 +1981,23 @@
"semver": "bin/semver.js"
}
},
"node_modules/@babel/preset-flow": {
"version": "7.23.3",
"resolved": "https://registry.npmjs.org/@babel/preset-flow/-/preset-flow-7.23.3.tgz",
"integrity": "sha512-7yn6hl8RIv+KNk6iIrGZ+D06VhVY35wLVf23Cz/mMu1zOr7u4MMP4j0nZ9tLf8+4ZFpnib8cFYgB/oYg9hfswA==",
"dev": true,
"dependencies": {
"@babel/helper-plugin-utils": "^7.22.5",
"@babel/helper-validator-option": "^7.22.15",
"@babel/plugin-transform-flow-strip-types": "^7.23.3"
},
"engines": {
"node": ">=6.9.0"
},
"peerDependencies": {
"@babel/core": "^7.0.0-0"
}
},
"node_modules/@babel/preset-modules": {
"version": "0.1.6-no-external-plugins",
"resolved": "https://registry.npmjs.org/@babel/preset-modules/-/preset-modules-0.1.6-no-external-plugins.tgz",
@ -1979,18 +2078,18 @@
}
},
"node_modules/@babel/traverse": {
"version": "7.23.3",
"resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.23.3.tgz",
"integrity": "sha512-+K0yF1/9yR0oHdE0StHuEj3uTPzwwbrLGfNOndVJVV2TqA5+j3oljJUb4nmB954FLGjNem976+B+eDuLIjesiQ==",
"version": "7.23.5",
"resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.23.5.tgz",
"integrity": "sha512-czx7Xy5a6sapWWRx61m1Ke1Ra4vczu1mCTtJam5zRTBOonfdJ+S/B6HYmGYu3fJtr8GGET3si6IhgWVBhJ/m8w==",
"dependencies": {
"@babel/code-frame": "^7.22.13",
"@babel/generator": "^7.23.3",
"@babel/code-frame": "^7.23.5",
"@babel/generator": "^7.23.5",
"@babel/helper-environment-visitor": "^7.22.20",
"@babel/helper-function-name": "^7.23.0",
"@babel/helper-hoist-variables": "^7.22.5",
"@babel/helper-split-export-declaration": "^7.22.6",
"@babel/parser": "^7.23.3",
"@babel/types": "^7.23.3",
"@babel/parser": "^7.23.5",
"@babel/types": "^7.23.5",
"debug": "^4.1.0",
"globals": "^11.1.0"
},
@ -1999,11 +2098,11 @@
}
},
"node_modules/@babel/types": {
"version": "7.23.3",
"resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.3.tgz",
"integrity": "sha512-OZnvoH2l8PK5eUvEcUyCt/sXgr/h+UWpVuBbOljwcrAgUl6lpchoQ++PHGyQy1AtYnVA6CEq3y5xeEI10brpXw==",
"version": "7.23.5",
"resolved": "https://registry.npmjs.org/@babel/types/-/types-7.23.5.tgz",
"integrity": "sha512-ON5kSOJwVO6xXVRTvOI0eOnWe7VdUcIpsovGo9U/Br4Ie4UVFQTboO2cYnDhAGU6Fp+UxSiT+pMft0SMHfuq6w==",
"dependencies": {
"@babel/helper-string-parser": "^7.22.5",
"@babel/helper-string-parser": "^7.23.4",
"@babel/helper-validator-identifier": "^7.22.20",
"to-fast-properties": "^2.0.0"
},
@ -2286,6 +2385,19 @@
"postcss-selector-parser": "^6.0.10"
}
},
"node_modules/@datastructures-js/heap": {
"version": "4.3.2",
"resolved": "https://registry.npmjs.org/@datastructures-js/heap/-/heap-4.3.2.tgz",
"integrity": "sha512-7/9QSsIZ+wMG3C9++mz9iOjdtTp9C036PISHvNjG3eyFO8nXOBJQFKgeV7M6/+EPl+oXXFRGBb8Ue60LsqTqGw=="
},
"node_modules/@datastructures-js/priority-queue": {
"version": "6.3.0",
"resolved": "https://registry.npmjs.org/@datastructures-js/priority-queue/-/priority-queue-6.3.0.tgz",
"integrity": "sha512-bJkryPys8zVYMCSjyBPYzJlw5V2kMeOYzGHRBXiGkwqTv8vZ/Ux5RO736T8Y6l3cH+ocbQV9UxlsFwA9qI4VhA==",
"dependencies": {
"@datastructures-js/heap": "^4.3.1"
}
},
"node_modules/@emotion/babel-plugin": {
"version": "11.11.0",
"resolved": "https://registry.npmjs.org/@emotion/babel-plugin/-/babel-plugin-11.11.0.tgz",
@ -3620,6 +3732,13 @@
"resolved": "https://registry.npmjs.org/react-is/-/react-is-18.2.0.tgz",
"integrity": "sha512-xWGDIW6x921xtzPkhiULtthJHoJvBbF3q26fzloPCK0hsvxtPVelvftw3zjbHWSkR2km9Z+4uxbDDK/6Zw9B8w=="
},
"node_modules/@nicolo-ribaudo/chokidar-2": {
"version": "2.1.8-no-fsevents.3",
"resolved": "https://registry.npmjs.org/@nicolo-ribaudo/chokidar-2/-/chokidar-2-2.1.8-no-fsevents.3.tgz",
"integrity": "sha512-s88O1aVtXftvp5bCPB7WnmXc5IwOZZ7YPuwNPt+GtOOXpPvad1LfbmjYv+qII7zP6RU2QGnqve27dnLycEnyEQ==",
"dev": true,
"optional": true
},
"node_modules/@nicolo-ribaudo/eslint-scope-5-internals": {
"version": "5.1.1-v1",
"resolved": "https://registry.npmjs.org/@nicolo-ribaudo/eslint-scope-5-internals/-/eslint-scope-5-internals-5.1.1-v1.tgz",
@ -8480,6 +8599,12 @@
"resolved": "https://registry.npmjs.org/fs-monkey/-/fs-monkey-1.0.5.tgz",
"integrity": "sha512-8uMbBjrhzW76TYgEV27Y5E//W2f/lTFmx78P2w19FZSxarhI/798APGQyuGCwmkNxgwGRhrLfvWyLBvNtuOmew=="
},
"node_modules/fs-readdir-recursive": {
"version": "1.1.0",
"resolved": "https://registry.npmjs.org/fs-readdir-recursive/-/fs-readdir-recursive-1.1.0.tgz",
"integrity": "sha512-GNanXlVr2pf02+sPN40XN8HG+ePaNcvM0q5mZBd668Obwb0yD5GiUbZOFgwn8kGMY6I3mdyDJzieUy3PTYyTRA==",
"dev": true
},
"node_modules/fs.realpath": {
"version": "1.0.0",
"resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",

6
package.json
View File

@ -3,6 +3,7 @@
"version": "0.1.1",
"private": true,
"dependencies": {
"@datastructures-js/priority-queue": "^6.3.0",
"@emotion/react": "^11.11.1",
"@emotion/styled": "^11.11.0",
"@mui/icons-material": "^5.14.18",
@ -15,7 +16,10 @@
"react-scripts": "5.0.1"
},
"devDependencies": {
"@babel/plugin-proposal-private-property-in-object": "latest"
"@babel/cli": "^7.23.4",
"@babel/core": "^7.23.5",
"@babel/plugin-proposal-private-property-in-object": "latest",
"@babel/preset-flow": "^7.23.3"
},
"scripts": {
"start": "react-scripts start",

9
src/UMap.js
View File

@ -109,13 +109,18 @@ function MapClickHandler({mks,focusUpdater,locator,locker}) {
post('POST', 'click', mks.current.state.markers).then((response) => {
// TODO: real functionality
const pl = JSON.parse(response.multipolyline);
mks.current.flushPolylines(pl);
// DEBUG
// response.__debug_pts.forEach(({lat,lon})=>{
// mks.current.addCandMarker(lat,lon);
// });
console.log(`pl = ${JSON.stringify(pl)}`);
if (pl.length > 1) mks.current.flushPolylines(pl);
focusUpdater([lat,lng]);
locator([lat,lng]);
locker(true);
}).catch((e) => {
console.error(e);
location.reload();
// location.reload();
});
},
// TODO

2
test/test_nearest.js Normal file
View File

@ -0,0 +1,2 @@
import shortestPath from "../comp/ShortestPath.js";
console.log('Hello!');