Android Question Change color of (polyline pline)

[yfleury]

Hello
Using googlemapsExtra, I created a route with markers. I drew the road with the polypoints and pline.

I want to know how to change the color of the road as the vehicle moves along the road.

 

[TILogistic]

Do you want to change the color of the plotted route if the car is on it?

 

[TILogistic]

example:
if the routes are in a variable of type map.

    Dim PolylineRoute As Polyline = Route.route_polyline
    PolylineRoute.Visible = True
    PolylineRoute.Color = Colors.Yellow

 

[yfleury]

Do you want to change the color of the plotted route if the car is on it?

Exactly I want change color from black (front of car) to green (back of car)

 

[TILogistic]

you must perform some calculations with the current position of the car, with the previous and next position of the route.

Attach a project to help you.

 

[yfleury]

I have a list of polypoints in DB and use it with these sub

Sub Affiche_les_routes
    LogColor ("Affiche_les_routes ", Colors.Magenta)
    Load_Polypoints 'from DB
    For x=0 To polyPoints.Size-1
        drawDirections(x)
    Next
End Sub

Sub drawDirections (numeroRoute As Int)
'    LogColor("drawDirections ",Colors.Blue)
    Dim jo As JavaObject
    Dim Points As List
    Points.Initialize
    jo.InitializeContext

    Points = jo.RunMethod("decodePoly", Array(polyPoints.Get(numeroRoute)))
    If Points.Size > 0 And Gmap.IsInitialized Then
        pline = Gmap.AddPolyline
        pline.Points = Points
'        pline.Color = Colors.red
    End If
End Sub

I can draw all polypoints

 

[TILogistic]

Exactly I want change color from black (front of car) to green (back of car)

If you don't want to do calculations, this can help.

Google Map Routes

Hello All, i have a route drawn on google maps. is there a way to find out if the vehicle has deviated from the route. i did some research and it seems like there is an api that i could use PolyUtil.isLocationOnPath() any suggestions?

www.b4x.com

PolyUtil (library API)

1.- You must check if the point (location of the car) is within a segment of the polyline.

2.- You need to know the direction or steering angle of the car and the angle of the segment it is on.

3.- Draw the polyline from the beginning of the segment to the point of the car and from this to the end of the segment.

reference:

Direction of a Point from a Line Segment - GeeksforGeeks

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

www.geeksforgeeks.org

Minimum distance from a point to the line segment using Vectors - GeeksforGeeks

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

www.geeksforgeeks.org

How can you determine a point is between two other points on a line segment?

Let's say you have a two dimensional plane with 2 points (called a and b) on it represented by an x integer and a y integer for each point. How can you determine if another point c is on the line

stackoverflow.com

etc.

 

[TILogistic]

PolyUtil (library API)

 

[yfleury]

Thanks Operra I will read on this and I will try