Issues checking if location is within set polygon about maps_toolkit

[Sacchid]

Sorry although I am not author of this package, am writing this to ask you that are you sure are those co-ordinates for points correctly ordered?
By using similar Geo-fencing package, both points (Point(25.392898, 55.455251) Point(25.394104, 55.454473)) are not inside Polygon, but Point(55.455251, 25.392898) and Point(55.454473, 25.394104) are both inside the given polygon.
For my ref, can you send link with which you have checked, I will also check these points with Gmap later.

[kb0]

Can you provide an example?

[ChristianAdrian]

<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Calibri",sans-serif;} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} MsoChpDefault {mso-style-type:export-only;} @page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 {page:WordSection1;} -->I’m using your package with another package and I used wikimapia API for getting the coordinates of the polygon. So in this capture you can see that the red pin is the current location. But containslocation returns false. When I move it in a different area within the polygon it returns true but sometimes it doesn’t. Anyway how to debug this issue? Sent from Mail for Windows 10 From: kb0Sent: Thursday, July 9, 2020 3:22 PMSubject: Re: [kb0/maps_toolkit] Issues checking if location is within set polygon (#4) Can you provide an example?—You are receiving this because you authored the thread.Reply to this email directly, view it on GitHub, or unsubscribe.  Virus-free. www.avast.com

[ChristianAdrian]

Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 [image: Capture.PNG] In the emulator the red pin is the current coordinates that is being compared I used wikimapia API for plotting the polygon and that the red highlight in the map as you can see the red pin is within the polygon but contains.location returns false in this coordinates. If I move it within the same polygon it returns true. How fix on this issue?

[kb0]

1. No image, only text [image: Capture.PNG]
2. Can you provide dart code with coordinates of polygon, and coordinates of point? Something, like:

PolygonUtil.containsLocation(
  LatLng(20.0, 33.5),
  [LatLng(28, -82), LatLng(29, -83), LatLng(30, -85), LatLng(28, -82)],
  true)

[ChristianAdrian]

[{"x":55.4695522,"y":25.3937088},{"x":55.4680877,"y":25.3945885},{"x":55.4669666,"y":25.3952887},{"x":55.4651588,"y":25.3955238},{"x":55.4634045,"y":25.3957539},{"x":55.461688,"y":25.395926},{"x":55.4603147,"y":25.396064},{"x":55.4590219,"y":25.3962459},{"x":55.4580186,"y":25.396384},{"x":55.4564952,"y":25.3967619},{"x":55.4557013,"y":25.397467},{"x":55.4548966,"y":25.3981769},{"x":55.4546231,"y":25.3986979},{"x":55.4543602,"y":25.3991751},{"x":55.4540169,"y":25.3991849},{"x":55.4538935,"y":25.3997689},{"x":55.4537487,"y":25.4004544},{"x":55.4535448,"y":25.4012299},{"x":55.4526758,"y":25.4010844},{"x":55.4519248,"y":25.4040403},{"x":55.4517852,"y":25.4040112},{"x":55.4487705,"y":25.4027515},{"x":55.4485558,"y":25.4026156},{"x":55.4480168,"y":25.4021663},{"x":55.4498431,"y":25.4003286},{"x":55.4510986,"y":25.3985452},{"x":55.4533194,"y":25.3953276},{"x":55.454607,"y":25.393263},{"x":55.4548966,"y":25.3928947},{"x":55.4551541,"y":25.3923422},{"x":55.4552613,"y":25.3913827},{"x":55.4551005,"y":25.3903843},{"x":55.4553687,"y":25.3899676},{"x":55.4563611,"y":25.389815},{"x":55.4573321,"y":25.3897108},{"x":55.4584693,"y":25.3895291},{"x":55.4590433,"y":25.3894467},{"x":55.4602503,"y":25.3892553},{"x":55.4609638,"y":25.3891559},{"x":55.4621171,"y":25.3889694},{"x":55.4635441,"y":25.3890759},{"x":55.4651105,"y":25.3893376},{"x":55.4662719,"y":25.3897823},{"x":55.4674708,"y":25.3902487},{"x":55.4683774,"y":25.3906583},{"x":55.4692679,"y":25.3910217},{"x":55.4708289,"y":25.3916445},{"x":55.4719017,"y":25.3917995}] this are the polygon coordinates 25.392898, 55.455251 this is a sample coordinate that does not work. 25.394104, 55.454473 this is a coordinate that returns true

…

On Thu, Jul 9, 2020 at 5:09 PM kb0 ***@***.***> wrote: 1. No image, only text [image: Capture.PNG] 2. Can you provide dart code with coordinates of polygon, and coordinates of point? Something, like: PolygonUtil.containsLocation( LatLng(20.0, 33.5), [LatLng(28, -82), LatLng(29, -83), LatLng(30, -85), LatLng(28, -82)], true) — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#4 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOW6FULILUT5HAV2DOWYXHLR2W6SBANCNFSM4OVKEQOQ> .

[ChristianAdrian]

any update regarding this issue?

[ChristianAdrian]

Sorry although I am not author of this package, am writing this to ask you that are you sure are those co-ordinates for points correctly ordered?
By using similar Geo-fencing package, both points (Point(25.392898, 55.455251) Point(25.394104, 55.454473)) are not inside Polygon, but Point(55.455251, 25.392898) and Point(55.454473, 25.394104) are both inside the given polygon.
For my ref, can you send link with which you have checked, I will also check these points with Gmap later.

Hi, I used wikimapia's api for getting the coordinate points and then saved it to our database. http://wikimapia.org/#lang=en&lat=25.390714&lon=55.457182&z=15&m=w&show=/22012924/Al-Rashideya-1 this is the link for the plotted coordinates.

[kb0]

@ChristianAdrian you should check order of your testing points. I add test for your case at https://github.com/kb0/maps_toolkit/blob/master/test/polygon_util_test.dart. It's work as expected:

// correct order of latitude and longitude
expect(
	PolygonUtil.containsLocation(
		LatLng(55.455251, 25.392898), polygon, true),
	equals(true));

expect(
	PolygonUtil.containsLocation(
		LatLng(55.454473, 25.394104), polygon, true),
	equals(true));

// reverse order of latitude and longitude
expect(
	PolygonUtil.containsLocation(
		LatLng(25.394104, 55.454473), polygon, true),
	equals(false));

expect(
	PolygonUtil.containsLocation(
		LatLng(25.394104, 55.454473), polygon, true),
	equals(false));

[ChristianAdrian]

@kb0

should check order of your testing points. I add test for your

@ChristianAdrian you should check order of your testing points. I add test for your case at https://github.com/kb0/maps_toolkit/blob/master/test/polygon_util_test.dart. It's work as expected:

// correct order of latitude and longitude
expect(
	PolygonUtil.containsLocation(
		LatLng(55.455251, 25.392898), polygon, true),
	equals(true));

expect(
	PolygonUtil.containsLocation(
		LatLng(55.454473, 25.394104), polygon, true),
	equals(true));

// reverse order of latitude and longitude
expect(
	PolygonUtil.containsLocation(
		LatLng(25.394104, 55.454473), polygon, true),
	equals(false));

expect(
	PolygonUtil.containsLocation(
		LatLng(25.394104, 55.454473), polygon, true),
	equals(false));

Hi, sorry my example was not clear but the value of x is the lng and the value of y is the lat
because im getting this data in an api thats why its like that but in my code I used it as the opposite
so in my code it is like this.

final polygon = makeList([

  25.3937088,
  55.4695522,
  25.3945885,
  55.4680877,
  25.3952887,
  55.4669666,
  25.3955238,
  55.4651588,
  25.3957539,
  55.4634045,
  25.395926,
  55.461688,
  25.396064,
  55.4603147,
  25.3962459,
  55.4590219,
  25.396384,
  55.4580186,
  25.3967619,
  55.4564952,
  25.397467,
  55.4557013,
  25.3981769,
  55.4548966,
  25.3986979,
  55.4546231,
  25.3991751,
  55.4543602,
  25.3991849,
  55.4540169,
  25.3997689,
  55.4538935,
  25.4004544,
  55.4537487,
  25.4012299,
  55.4535448,
  25.4010844,
  55.4526758,
  25.4040403,
  55.4519248,
  25.4040112,
  55.4517852,
  25.4027515,
  55.4487705,
  25.4026156,
  55.4485558,
  25.4021663,
  55.4480168,
  25.4003286,
  55.4498431,
  25.3985452,
  55.4510986,
  25.3953276,
  55.4533194,
  25.393263,
  55.454607,
  25.3928947,
  55.4548966,
  25.3923422,
  55.4551541,
  25.3913827,
  55.4552613,
  25.3903843,
  55.4551005,
  25.3899676,
  55.4553687,
  25.389815,
  55.4563611,
  25.3897108,
  55.4573321,
  25.3895291,
  55.4584693,
  25.3894467,
  55.4590433,
  25.3892553,
  55.4602503,
  25.3891559,
  55.4609638,
  25.3889694,
  55.4621171,
  25.3890759,
  55.4635441,
  25.3893376,
  55.4651105,
  25.3897823,
  55.4662719,
  25.3902487,
  55.4674708,
  25.3906583,
  55.4683774,
  25.3910217,
  55.4692679,
  25.3916445,
  55.4708289,
  25.3917995
  55.4719017,
]);

PolygonUtil.containsLocation(

  LatLng(25.394104, 55.454473), polygon, true),

equals(false));
expect(
PolygonUtil.containsLocation(
LatLng(25.394104, 55.454473), polygon, true),
equals(false));

its supposed to be like this. But I'm still getting some parts within the polygon return false.

[kb0]

@ChristianAdrian I add test with reverse order of coordinates (latitude <-> longitude) - 'contains issue-4-2' (923579b) - it's work on your data

[ChristianAdrian]

@kb0

@ChristianAdrian I add test with reverse order of coordinates (latitude <-> longitude) - 'contains issue-4-2' (923579b) - it's work on your data

yes that returns true
but this one returns false even if its within the polygon
25.392898, 55.455251

reference from my first
#4 (comment)

this is why I cant figure out the problem because some of the plots within the polygon works but some does not

[kb0]

Fix point in tests, point (25.392898, 55.455251) return true:

    expect(
        PolygonUtil.containsLocation(
            LatLng(25.392898, 55.455251), polygon, true),
        equals(true));

[ChristianAdrian]

Fix point in tests, point (25.392898, 55.455251) return true:

    expect(
        PolygonUtil.containsLocation(
            LatLng(25.392898, 55.455251), polygon, true),
        equals(true));

Thanks, I have found the problem it's with the other package I'm using to get the location