[
https://issues.apache.org/jira/browse/MATH-880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Curtis Jensen updated MATH-880:
-------------------------------
Attachment: PolygonInputs.png
Plot of the input polygons.
> Polygon difference produces erronious results in some cases
> -----------------------------------------------------------
>
> Key: MATH-880
> URL: https://issues.apache.org/jira/browse/MATH-880
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.0
> Reporter: Curtis Jensen
> Fix For: 3.1
>
> Attachments: PolygonInputs.png
>
>
> The 2D polygon difference method is returning incorrect
> results. Below is a test case of subtracting two polygons (Sorry,
> this is the simplest case that I could find that duplicates the
> problem).
> There are three problems with the result. The first is that the first
> point of the first set of vertices is null (and the first point of the
> second set is also null). The second is that, even if the first null
> points are ignored, the returned polygon is not the correct result.
> The first and last points are way off, and the remaining points do not
> match the original polygon boundaries. Additionally, there are two
> holes that are returned in the results. This subtraction case should
> not have holes.
> {code:title="Complex Polygon Difference Test"}
> public void testComplexDifference() {
> Vector2D[][] vertices1 = new Vector2D[][] {
> new Vector2D[] {
> new Vector2D( 90.08714908223715, 38.370299337260235),
> new Vector2D( 90.08709517675004, 38.3702895991413),
> new Vector2D( 90.08401538704919, 38.368849330127944),
> new Vector2D( 90.08258210430711, 38.367634558585564),
> new Vector2D( 90.08251455106665, 38.36763409247078),
> new Vector2D( 90.08106599752608, 38.36761621664249),
> new Vector2D( 90.08249585300035, 38.36753627557965),
> new Vector2D( 90.09075743352184, 38.35914647644972),
> new Vector2D( 90.09099945896571, 38.35896264724079),
> new Vector2D( 90.09269383800086, 38.34595756121246),
> new Vector2D( 90.09638631543191, 38.3457988093121),
> new Vector2D( 90.09666417351019, 38.34523360999418),
> new Vector2D( 90.1297082145872, 38.337670454923625),
> new Vector2D( 90.12971687748956, 38.337669827794684),
> new Vector2D( 90.1240820219179, 38.34328502001131),
> new Vector2D( 90.13084259656404, 38.34017811765017),
> new Vector2D( 90.13378567942857, 38.33860579180606),
> new Vector2D( 90.13519557833206, 38.33621054663689),
> new Vector2D( 90.13545616732307, 38.33614965452864),
> new Vector2D( 90.13553111202748, 38.33613962818305),
> new Vector2D( 90.1356903436448, 38.33610227127048),
> new Vector2D( 90.13576283227428, 38.33609255422783),
> new Vector2D( 90.13595870833188, 38.33604606376991),
> new Vector2D( 90.1361556630693, 38.3360024198866),
> new Vector2D( 90.13622408795709, 38.335987048115726),
> new Vector2D( 90.13696189099994, 38.33581914328681),
> new Vector2D( 90.13746655304897, 38.33616706665265),
> new Vector2D( 90.13845973716064, 38.33650776167099),
> new Vector2D( 90.13950901827667, 38.3368469456463),
> new Vector2D( 90.14393814424852, 38.337591835857495),
> new Vector2D( 90.14483839716831, 38.337076122362475),
> new Vector2D( 90.14565474433601, 38.33769000964429),
> new Vector2D( 90.14569421179482, 38.3377117256905),
> new Vector2D( 90.14577067124333, 38.33770883625908),
> new Vector2D( 90.14600350631684, 38.337714326520995),
> new Vector2D( 90.14600355139731, 38.33771435193319),
> new Vector2D( 90.14600369112401, 38.33771443882085),
> new Vector2D( 90.14600382486884, 38.33771453466096),
> new Vector2D( 90.14600395205912, 38.33771463904344),
> new Vector2D( 90.14600407214999, 38.337714751520764),
> new Vector2D( 90.14600418462749, 38.337714871611695),
> new Vector2D( 90.14600422249327, 38.337714915811034),
> new Vector2D( 90.14867838361471, 38.34113888210675),
> new Vector2D( 90.14923750157374, 38.341582537502575),
> new Vector2D( 90.14877083250991, 38.34160685841391),
> new Vector2D( 90.14816667319519, 38.34244232585684),
> new Vector2D( 90.14797696744586, 38.34248455284745),
> new Vector2D( 90.14484318014337, 38.34385573215269),
> new Vector2D( 90.14477919958296, 38.3453797747614),
> new Vector2D( 90.14202393306448, 38.34464324839456),
> new Vector2D( 90.14198920640195, 38.344651155237216),
> new Vector2D( 90.14155207025175, 38.34486424263724),
> new Vector2D( 90.1415196143314, 38.344871730519),
> new Vector2D( 90.14128611910814, 38.34500196593859),
> new Vector2D( 90.14047850603913, 38.34600084496253),
> new Vector2D( 90.14045907000337, 38.34601860032171),
> new Vector2D( 90.14039496493928, 38.346223030432384),
> new Vector2D( 90.14037626063737, 38.346240203360026),
> new Vector2D( 90.14030005823724, 38.34646920000705),
> new Vector2D( 90.13799164754806, 38.34903093011013),
> new Vector2D( 90.11045289492762, 38.36801537312368),
> new Vector2D( 90.10871471476526, 38.36878044144294),
> new Vector2D( 90.10424901707671, 38.374300101757),
> new Vector2D( 90.10263482039932, 38.37310041316073),
> new Vector2D( 90.09834601753448, 38.373615053823414),
> new Vector2D( 90.0979455456843, 38.373578376172475),
> new Vector2D( 90.09086514328669, 38.37527884194668),
> new Vector2D( 90.09084931407364, 38.37590801712463),
> new Vector2D( 90.09081227075944, 38.37526295920463),
> new Vector2D( 90.09081378927135, 38.375193883266434)
> }
> };
> PolygonsSet set1 = buildSet(vertices1);
> Vector2D[][] vertices2 = new Vector2D[][] {
> new Vector2D[] {
> new Vector2D( 90.13067558880044, 38.36977255037573),
> new Vector2D( 90.12907570488, 38.36817308242706),
> new Vector2D( 90.1342774136516, 38.356886880294724),
> new Vector2D( 90.13090330629757, 38.34664392676211),
> new Vector2D( 90.13078571364593, 38.344904617518466),
> new Vector2D( 90.1315602208914, 38.3447185040846),
> new Vector2D( 90.1316336226821, 38.34470643148342),
> new Vector2D( 90.134020944832, 38.340936644972885),
> new Vector2D( 90.13912536387306, 38.335497255122334),
> new Vector2D( 90.1396178806582, 38.334878075552126),
> new Vector2D( 90.14083049696671, 38.33316530644106),
> new Vector2D( 90.14145252901329, 38.33152722916191),
> new Vector2D( 90.1404779335565, 38.32863516047786),
> new Vector2D( 90.14282712131586, 38.327504432532066),
> new Vector2D( 90.14616669875488, 38.3237354115015),
> new Vector2D( 90.14860976050608, 38.315714862457924),
> new Vector2D( 90.14999277782437, 38.3164932507504),
> new Vector2D( 90.15005207194997, 38.316534677663356),
> new Vector2D( 90.15508513859612, 38.31878731691609),
> new Vector2D( 90.15919938519221, 38.31852743183782),
> new Vector2D( 90.16093758658837, 38.31880662005153),
> new Vector2D( 90.16099420184912, 38.318825953291594),
> new Vector2D( 90.1665411125756, 38.31859497874757),
> new Vector2D( 90.16999653861313, 38.32505772048029),
> new Vector2D( 90.17475243391698, 38.32594398441148),
> new Vector2D( 90.17940844844992, 38.327427213761325),
> new Vector2D( 90.20951909541378, 38.330616833491774),
> new Vector2D( 90.2155400467941, 38.331746223670336),
> new Vector2D( 90.21559881391778, 38.33175551425302),
> new Vector2D( 90.21916646426041, 38.332584299620805),
> new Vector2D( 90.23863749852285, 38.34778978875795),
> new Vector2D( 90.25459855175802, 38.357790570608984),
> new Vector2D( 90.25964298227257, 38.356918010203174),
> new Vector2D( 90.26024593994703, 38.361692743151366),
> new Vector2D( 90.26146187570015, 38.36311080550837),
> new Vector2D( 90.26614159359622, 38.36510808579902),
> new Vector2D( 90.26621342936448, 38.36507942500333),
> new Vector2D( 90.26652190211962, 38.36494042196722),
> new Vector2D( 90.26621240678867, 38.365113172030874),
> new Vector2D( 90.26614057102057, 38.365141832826794),
> new Vector2D( 90.26380080055299, 38.3660381760273),
> new Vector2D( 90.26315345241, 38.36670658276421),
> new Vector2D( 90.26251574942881, 38.367490323488084),
> new Vector2D( 90.26247873448426, 38.36755266444749),
> new Vector2D( 90.26234628016698, 38.36787989125406),
> new Vector2D( 90.26214559424784, 38.36945909356126),
> new Vector2D( 90.25861728442555, 38.37200753430875),
> new Vector2D( 90.23905557537864, 38.375405314295904),
> new Vector2D( 90.22517251874075, 38.38984691662256),
> new Vector2D( 90.22549955153215, 38.3911564273979),
> new Vector2D( 90.22434386063355, 38.391476432092134),
> new Vector2D( 90.22147729457276, 38.39134652252034),
> new Vector2D( 90.22142070120117, 38.391349167741964),
> new Vector2D( 90.20665060751588, 38.39475580900313),
> new Vector2D( 90.20042268367109, 38.39842558622888),
> new Vector2D( 90.17423771242085, 38.402727751805344),
> new Vector2D( 90.16756796257476, 38.40913898597597),
> new Vector2D( 90.16728283954308, 38.411255399912875),
> new Vector2D( 90.16703538220418, 38.41136059866693),
> new Vector2D( 90.16725865657685, 38.41013618805954),
> new Vector2D( 90.16746107640665, 38.40902614307544),
> new Vector2D( 90.16122795307462, 38.39773101873203)
> }
> };
> PolygonsSet set2 = buildSet(vertices2);
> PolygonsSet set = (PolygonsSet) new
> RegionFactory<Euclidean2D>().difference(set1.copySelf(),
> set2.copySelf());
> Vector2D[][] verticies = set.getVertices();
> Assert.assertTrue(verticies[0][0] != null);
> Assert.assertEquals(1, verticies.length);
> }
> {code}
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