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With this class, you can check if the GPS location coordinate is inside a polygon. You can use this class to check whether the user is inside a building, shopping mall or any custom shape. This class is only for B4A and B4I. Here is how can you get the coordinates of an establishment (school, offic
link: This is based on google.maps.geometry.poly.containsLocation. To check if the point is on the edge of a polyline you have to use google.maps.geometry.p
link: How to check if the GPS is on a plotted route? I ask this before posting the query on the forum.
link: info: year 2015 https://www.b4x.com/android/forum/threads/geo-zone-determination-point-in-polygon.53929/

Based on this source http://rosettacode.org/wiki/Ray-casting_algorithm I've adatped the code to B4i (should be identical for B4J and B4A too) and I want to share it in this so helpful forum. You need to call the sub with a Point(LatLng) and a list(LatLng) that contains the sequence of vertex of the
link: Confirm. Work without problem in B4A. Great work @marcick +50 ;);)
link: Thanks very interesting !

I use this code to check whether a point is inside a polyon: Type ePoint(X As Double, Y As Double) Public Sub IsPointInPolygon(polygon() As ePoint, X As Double, Y As Double) As Boolean Dim result As Boolean = False Dim j As Int = polygon.length - 1 For i = 0 To polygon.length - 1
link: Hi, José, thank you, but unfortunately not. "Geofence regions are defined as a circle with a center point and radius" My areas are polygons, like thi
link: Hello I want to parse a KML file with polygons (XML2MAP ?) and save it (in a SQL file, or is there a more suitable way?) Then the user should be abl
link: Yes, it is possible. Yes, you should use Xml2Map.

Attached you find a small project which returns if a point is inside the polygon, in the surrounding with a given distance or outsides the surrounding. It is an evolution of this project. The routine checks first if the point is in the polygon and then check if the distance of the point to the each
link: Hi, im using googlemapextras and have a series of polygons which define property boundaries. I need to be able to calculate if a given lat/lng is with
link: You can see the formula here: https://en.wikipedia.#Line_defined_by_two_points If the polygon is not too large then you can ignore the fact that the

Is a point inside a polygon: Converted from a C routine taken from here: http://www.codeproject.com/Tips/84226/Is-a-Point-inside-a-Polygon There is an explanation of it's workings and it's license in the link. Private Sub pnpoly(nvert As Int, vertx() As Int, verty() As Int, testx As Int, testy As
link: hi, Private Sub pnpoly(nvert As Int, vertx() As Int, verty() As Int, testx As Int, testy As Int) i understand that vertx() and verty() are the poly
link: maybe something like this: Dim point() As Double = Array As Double(120,80) '. Dim polygon As List polygon.Initialize polygon.Add(Ar
link: I am not sure if the question is pointed to wonder or to anyone but a good and importent formula would be to get the centroid of an polygon https://e

The algoritm for finding out if a point is within a polygon is pretty straightforward: Pick a point that you know is outside the polygon (such as the smallest X and smallest Y, both -1). Then, simply see how many polygon border lines a line between that point and the point you want to test intersec
link: Dim current_location As LatLng What type of object is LatLng? Can I create this without have to load another lib? I just want to use PolygonRaycast
link: <root> <doclet-version-NOT-library-version>1.00</doclet-version-NOT-library-version> <dependsOn>googlemaps</dependsOn> <dependsOn>googlemapsextr

Search for "point inside a polygon" and possibly the questions are answered at post #2 (point) and #5 (area)
link: hello my freinds ,I took a polygon with jgooglemap library How can a point inside the polygon or not? and How to calculate polygon area? tanks
link: There's a text Box in top right Page on community forum to do searches: https://www.b4x./?query=point+inside+a+polygon&page=1&prefix=0

You can have a look at this project PointInPolygonSurrounding. The only point is that the program, in this project, returns if the point is in the polygon, in an outer surrounding within a given distance or out of the surrounding. The code could easily modified to check the inverse. In the CheckPoi
link: I use this in my app to determine if a vehicle is within a defined zone made of 5 or more lat/lon coordinates. Point 1 is also Point 5 (first point a
link: Central point for a square works because of its simmetry. Also would work for regular polygons. Not sure if centroid would solve all cases If you wan
link: :( i am afraid this solution will not help me much. lets say i have 2 polygons and i want to know if they are overlapping so what am i doing i che

Not worked on this idea yet, but solved 2 problems demonstrated in the posted image. One was that adding random map points inside a polygon that was drawn round a point on the 180 degree meridian didn't work OK. This was caused by a Sub that checked if a lat/lng point was inside that polygon didn't
link: Managed to draw a polygon (purple) around a point on the 180 meridian. Managed to (kind of) get random points (red) in that polygon. Less so managed t
link: dMinLat, dMaxLng) End If Return BB End Sub Then from this boundingbox we can see if the polygon has a point on the 180 degree meri
link: I can avoid the wrong polygon lines by recording (in a map) the lX points of a newly added polygon, with the polygon index as the key and the lX as th

If it doesn't need to be 100% accurate then you can treat the circle as a square and test whether any of the four points is inside the polygon (assuming that the circle is small relatively to the polygon). https://www.b4x.com/android/forum/threads/geo-zone-determination-point-in-polygon.53929/#cont
link: Hello all, is there a way to find out if a circle ( a point with a radius ) overlaps with any of the polygons in a KMZ/KML file? many thanks.
link: If it needs to be accurate or if you have more complicated shapes than a circle: Create two bitmaps (BitmapCreator). Draw filled polygons on one. Dr
link: That is a brilliant idea. I am going to put this to work. I will feedback on the result.

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