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Stored procedures
Displays the current device position in a Map control and updates this position during its move.
Versions 20 and later
WEBDEV - Browser code This function is now available in Browser code.
New in version 20
WEBDEV - Browser code This function is now available in Browser code.
WEBDEV - Browser code This function is now available in Browser code.
Example
// Starts following the movement in the map
MapFollowMovement(MAP_Position)
Syntax
<Result> = MapFollowMovement(<Map control> [, <Compass> [, <Procedure name>]])
<Result>: Boolean
  • True if the following of movement was enabled,
  • False otherwise. To find out the error details, use ErrorInfo.
<Map control>: Control name
Name of Map control to use. If this parameter corresponds to an empty string (""), the Map control to which the current process belongs will be used.
<Compass>: Optional boolean
  • True to enable the compass. A compass is displayed in the Map control to indicate the orientation of the move. This option is available for the devices equipped with an orientation sensor.
  • False (default value) to disable the compass.
<Procedure name>: Optional character string (with or without quotes)
Name of WLanguage procedure ("callback") called whenever a change of position is notified. This procedure has the following format:
PROCEDURE <Procedure name> (<Position>)

where <Position> is a geoPosition variable containing information about the position of the device when the notification is performed.
The parameters of this procedure are optional. There is no need to pass parameters to this procedure. Indeed, these parameters are automatically filled during each call.
If this procedure returns False, the map displayed in the control will not be refreshed.
If this parameter is not specified, whenever a change of device position is notified, the map displayed in the Map control is automatically centered on the new position.
Remarks

Special cases

  • To stop following the move, use MapEndOfMove.
  • A blue circle may appear around the marker, indicating the current position of the device. This circle is a representation of the level of precision regarding the position. The more it is extended, less precise the position will be. To define the position of the device, the function uses two types of "localization providers":
    • the network of GPS satellites,
    • the triangulation performed from the network of mobile and Wi-Fi antennas.
    The choice depends on the localization setting of the device when the call is performed.
  • A period of time may pass between the call to MapFollowMovement and the effective display of the device position on the map. This duration corresponds to the time taken by the localization provider (GPS or mobile/Wi-Fi network) to define the current position of the device. Once this position is found, the map control is automatically centered on this one.
Related Examples:
WM Geo-localization Cross-platform examples (WINDEV Mobile): WM Geo-localization
[ + ] This example explains how to perform proximity searches with geolocalization:
- search around me
- search in a city, at a given address, or close to a specific address.
The results are displayed in a looper and in a map with markers.
WM Sports Cross-platform examples (WINDEV Mobile): WM Sports
[ + ] This example is a sport application used to save your performances.
The application calculates the distance, the time, the average speed and the number of calories spent according to the sport.
The run is displayed on a map control via markers and an itinerary.

The example also includes a server part used to synchronize the user data.
This webservice is available in the WEBDEV "WW_Sports" example.
Component : WDJS.DLL
Minimum version required
  • Version 17
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