jsts.operation.overlay.OverlayOp.difference fails silently with the following geometries

[Stophface]

Thanks for the awesome library. I think I have run into a bug.

I have this cover geometry

const cover = '{"type":"Polygon","coordinates":[[[-180,-90],[180,-90],[180,90],[-180,90],[-180,-90]]]}'

And this is the geometry I want to substract from it

const substract = '{"type":"MultiPolygon","coordinates":[[[[11.3582165852589,49.605796423266156],[11.35938210886658,49.593914318370565],[11.343173991041912,49.58664605796745],[11.325799836750775,49.59125862223311],[11.309598085585405,49.58398604821548],[11.31077099606537,49.57210219092058],[11.294576120487468,49.56482658787256],[11.2957511100792,49.552940193089384],[11.313115679293572,49.54832861050819],[11.31428745240765,49.53643888850257],[11.298099949891482,49.529161540563784],[11.299273800478307,49.51726928393577],[11.283093163560594,49.50998891462938],[11.26573817845313,49.514599522315876],[11.24956391108442,49.50731485560685],[11.250745120943,49.495420861609695],[11.234577716789783,49.4881331814979],[11.235760994391512,49.476236658857054],[11.219600450358437,49.46894596925506],[11.22078579286905,49.457046920189676],[11.204632105859792,49.44975322501224],[11.20581951044802,49.43785165174474],[11.189672677365373,49.43055495490888],[11.190862141203127,49.41865085966482],[11.17472215894895,49.4113511650898],[11.175913679211229,49.39944455009797],[11.193239918143068,49.39483682643362],[11.194428231614248,49.38292688957892],[11.17829556739262,49.375625480284],[11.1794859356811,49.363713026596834],[11.196803709480573,49.359101178228876],[11.197990874244024,49.34718540487109],[11.181865521576183,49.33988228450619],[11.183054739551451,49.32796399724284],[11.200364056351273,49.3233480256403],[11.201550074062666,49.311426420909974],[11.185432026478232,49.30412159313678],[11.186620095797688,49.29219747743936],[11.203920963718973,49.2875773840826],[11.20510583603079,49.275649953133396],[11.188995087067742,49.268343421625296],[11.190182009385593,49.256413482659035],[11.207474436538046,49.25178926903981],[11.20865816509966,49.23985601704842],[11.192554708304263,49.23254778549051],[11.19374048527162,49.22061202844375],[11.21102447975341,49.215983696065194],[11.212207066210992,49.20404462823142],[11.229487395120994,49.19941170731133],[11.230666793109911,49.1874693302274],[11.247943454391715,49.18283182230204],[11.249119665953392,49.170886137508404],[11.233024451502088,49.163578766530115],[11.234202712269047,49.151630581082536],[11.251470954728463,49.146988960650965],[11.252646032304511,49.13503746975552],[11.26991060797106,49.13039126623614],[11.271082504395299,49.11843647144304],[11.254995054739233,49.11112868595848],[11.256168999959847,49.09917139423035],[11.27342516775633,49.09452108212755],[11.274595935053993,49.08256048878126],[11.291848436902647,49.07790559752915],[11.293016028314184,49.06594170412463],[11.310264862182061,49.06128223528308],[11.311429279744637,49.049315043383935],[11.328674443604072,49.04465099851742],[11.329835689355273,49.032680509690906],[11.34707718118392,49.02801189036859],[11.348235257161647,49.016038106185576],[11.332157062652461,49.00873374450949],[11.333317190555388,48.99675746934353],[11.350550294126263,48.99208475260418],[11.351707255469059,48.98010518439732],[11.368936687890766,48.975427897190215],[11.370090484709003,48.963445037523115],[11.387316243973473,48.95876318143158],[11.40339290999486,48.96606370832109],[11.420619693582383,48.96137680696007],[11.421765110851993,48.94938985713336],[11.438988212376158,48.94469838923201],[11.44013047006684,48.93270815195823],[11.457349887536925,48.92801211911363],[11.45848898768866,48.91601859598566],[11.442413886489579,48.9087219038523],[11.443555045572152,48.89672589422454],[11.460766092231838,48.8920257785212],[11.461904096972804,48.880026485391724],[11.445836266355302,48.87272810683698],[11.446976328405773,48.860726330286795],[11.430915235739892,48.853424991038246],[11.432057352324472,48.841420733393754],[11.449255356698433,48.83671701450398],[11.450394323289832,48.82470947648617],[11.434340488069267,48.81740645851676],[11.435481507579116,48.80539644250162],[11.452671162235104,48.800688643241116],[11.453809034937532,48.78867534923386],[11.437762450746977,48.78137065636801],[11.43890237475395,48.76935488747207],[11.422862512157083,48.76204724568604],[11.424004484703913,48.7500290042435],[11.44118112848551,48.74531760108489],[11.442319958558404,48.73329608482139],[11.45949293770889,48.72858012982731],[11.46062862733154,48.71655534036907],[11.477797939881947,48.71183483516576],[11.478930491078302,48.699806774142715],[11.462898917033534,48.69250002080228],[11.464033517459477,48.68046949192927],[11.48119450709759,48.675744913866176],[11.482325972266086,48.663711115850774],[11.49948329624171,48.65898199169408],[11.50061162817438,48.64694492617615],[11.517765284532546,48.64221125756633],[11.518890485251328,48.630170926189386],[11.502867210382975,48.62286506492568],[11.503994461002701,48.61082227043907],[11.52113980819208,48.60608453566482],[11.522263930756786,48.594038477765764],[11.53940561128412,48.58929620268491],[11.54052660781342,48.57724688302684],[11.557664619737649,48.5725000692942],[11.558782492251439,48.560447489534255],[11.575916833636631,48.55569613880921],[11.57703158415512,48.543640300608295],[11.561017166626353,48.53633661279873],[11.562133968827528,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This is the code I am using, which works with all of my other substract geometries, but not with the one above.

import * as jsts from 'jsts';

const reader = new jsts.io.GeoJSONReader();
const writer = new jsts.io.GeoJSONWriter();
const coverJsts = reader.read(cover);
const geometryJsts = reader.read(substract);
const difference = jsts.operation.overlay.OverlayOp.difference(coverJsts, geometryJsts);

Now. this line const difference = jsts.operation.overlay.OverlayOp.difference(coverJsts, geometryJsts) fails silently. It never finishes, never produces an error, never produces an output and I cannot see any reason. If needed, I can provide different geometries of similar shape with which I do not encounter this problem. Here, a visualisation of substractGeojson and coverGeojson done on geojson.io.

coverGeojson (basically a geometry that covers the whole world)

substractGeojson (the 'path' I want to stencil into the cover)

I am using jsts: 2.11.0

[bjornharrtell]

Perhaps it's hitting a path that is highly inefficient as ported JavaScript, so that it will simply run "forever". Will require a substantial effort to get to the root cause and might be difficult to fix, so it's not likely I will be able to help in short term. A first step would be to compare with upstream, both with the version that the port is based on and newer. Assuming latest upstream work I would and you need to resolve this quicker I would suggest to do this kind of calculation serverside using upstream.

[Stophface]

@bjornharrtell thanks for the quick response. Is there a potential workaround? Like splitting the geometry into smaller parts and do the calculation step by step? I cannot do it Server side, it must run on the client.

[bjornharrtell]

I do not think that will help. No immediate solution comes to mind, but I do wonder if your use case really needs this perhaps you can rethink.

[Stophface]

@bjornharrtell what do you mean by „if my use case really needs this“.

My (offline) application displays the path a user took. If you drive from lets New York to Washington, that is the path I want to display. Not sure how I can work around this.

The strange thing is: when I try to run the difference algorithm with a waaaaay more complex cover geometry, it works like a charm.

[bjornharrtell]

Well, why do you need it cut out to display it?

Anyway it's surely possible find out the root cause if you dig deep enough.

[Stophface]

@bjornharrtell Because that is what my app needs to do :)

I will play around with it and let you know if I find sth out! Thanks for your help!