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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 and last point are same value). A simple box shows how to create this: 1----------2 | ........... | | ........... | clockwise (or counter clockwise)
link: 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 pol
link: Thanks for the likes guys and gals... I have been testing this and it works surprisingly well with consumer device chip sets. I shall report any oth
link: Excellent reply... I am only working from what I barely understand about this process. From what I read about examples on-line, they said to close t

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: info: year 2015 https://www.b4x.com/android/forum/threads/geo-zone-determination-point-in-polygon.53929/
link: How to check if the GPS is on a plotted route? I ask this before posting the query on the forum.

X2 As Float, Y2 As Float, Z2 As Float, BorderColor As Int, FillColor As Int()) As Object3D Create Cube - Add 6 Polygon - Set Array as Color (min 1, max 6 Color) AddCube(121,10,10,10,-10,-10,-10,xui.Color_Black,array as int(xui.Color_White)) AddCube(121,10,10,10,-10,-10,-10,xui.Color_Black,array a
link: PointClick: Checks whether the point on the screen corresponds to a polygon and returns its ID. setColor: To change color to one the most polygons. In
link: greetings thank you. In my sample I cannot choose the correct face, in a cube if I touch face 1 (it is shown on the screen as the one in front), face
link: This code displays the rotation of objects/polygons on a panel but does not modify the original objects. P3D.Rotate(Null,X,Y,Z).RenderToView(Panel,cen

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: Thanks very interesting !
link: Confirm. Work without problem in B4A. Great work @marcick +50 ;);)

9 40 40-17.9 40-40 40-40-17.9-40-40z"/> <g fill="#fff"> <polygon points="24.7 48.3 28.7 27.6 22.2 27.6 21 34.2 14.9 34.2 16.2 27.6 9.77 27.6 9.77 27.6 9.77 27.6 5.81 48.3 12.2 48.3 13.8 40.1 19.9 40.1 18.4 48.3"/> <polygon points="54.3 27.6 50.4 48.3 56.4 48.3 60.3 27.6 54.3 27.6"/> <path d="m68.1 3

I made a small test program with your coordinates to verify the calculation in Sub FindInZone. The calculation is OK ! So the problem is somewhere else. Therefore I checked further and I suspect that the problem is here: If FindInZone(polxa,polya,Point.Latitude,Point.Longitude)=True It should be: I
link: I don't understand your algorithm for the point-in-polygon check but there seems to be problem with it. Try this: Sub FindInZone( polx As List, poly A
link: -87.25455) l34.Initialize(14.05757, -87.25687) l35.Initialize(14.0609, -87.24391) l36.Initialize(14.06215, -87.23662) l37.Initialize(1
link: i change I changed in the function FindInZone polx, poly from the list type to the double type and declared as it is in the example you sent me a

At the risk of extending this discussion beyond its usefulness, I would like to add this. We will all agree that the position and shape of an object should be independent parameters. A change in position should not influence shape and a change in shape should not influence position. (Once I finish
link: I am a woodworker and shelves are real objects, and indeed that is how I measure my shelves. I am also a mathematician and rectangles are abstract obj

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

https://www.b4x.com/android/forum/threads/geo-zone-determination-point-in-polygon.53929/ Finding a point that is within a polygon.... if helpful.... This is a major function that runs every second within one of my apps to determine where the current user is located - and display on screen where h
link: but the special sub (PointInsidePolygon) need to check. if your current lat, lng is into polygon is this: Sub PointInsidePolygon(point As LatLng, Lat
link: dim pollst as list ... sub yoursub dim pol As MapPolygon Dim latlst As List Dim lonlst As List pollst.initialize latlst.initialize lonlst.initiali

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: 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
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

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