GPSFollowMovement (Function)

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Retrieved properties
Notes
Required application feature

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GPSFollowMovement (Function)

In french: GPSSuitDéplacement

Asks to be regularly notified about the current device position.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Versions 22 and later

This function is now available for WINDEV applications.

New in version 22

This function is now available for WINDEV applications.

Example

// Branches a procedure to receive the device position at regular intervals
GPSFollowMovement(MovementProc)

// Procedure
PROCEDURE MovementProc(pos is geoPosition)

Info(" Latitude: " + pos..Latitude)
Info(" Longitude: " + pos..Longitude)

Syntax

Enabling the notification mechanism (in a mobile) Hide the details

GPSFollowMovement(<WLanguage procedure> [, <Timeout> [, <Distance>]])

<WLanguage procedure>: Procedure name

Name of WLanguage procedure called at each notification.
This procedure has the following format:

PROCEDURE <Procedure name>(<Position>)

<Position> is a geoPosition variable containing information about the device position at the time of notification.

<Timeout>: Optional integer or optional Duration

Minimum timeout (in hundredths of a second) between two notifications. If this parameter is not specified, the minimum time-out will be set to 60 seconds.
Remark: This parameter can correspond to:
an integer corresponding to the number of hundredths of a second,
a Duration variable,
Versions 23 and later
the direct indication of duration (1 s or 10 ms for example).
New in version 23
the direct indication of duration (1 s or 10 ms for example).
the direct indication of duration (1 s or 10 ms for example).
This parameter is ignored.

<Distance>: Optional real

Minimum distance (in meters) between two notifications.
If this parameter is not specified, the minimum distance will be set to 5 meters.

Disabling the notification mechanism

GPSFollowMovement()

Remarks

Retrieved properties

To find out whether the ..Speed, ..Precision, ..Direction or ..Altitude properties of a geoPosition variable have been filled when retrieving the position, use ..SpeedValid, ..PrecisionValid, ..DirectionValid and ..AltitudeValid.
To reinitialize a geoPosition variable, use VariableReset.
The positioning information that was retrieved corresponds to the last known device position: therefore, they may not correspond to the current device position if the device was moved while the GPS signal was not valid for example. To find out the date and time when the position was calculated, use the MeasurementDate property of geoPosition variable.
..Speed, ..Precision, ..Direction and ..Altitude will be specified only if the location provider allows it (otherwise, these properties will take their default value).

Notes

Geolocation functions can consume a lot of resources on the device (battery, bandwidth, etc.). Therefore, we advise you not de define very small values for the minimum time-out and for the minimum distance between two notifications.
To stop receiving notifications, call GPSFollowMovement without parameter or call GPSEnd.

Versions 21 and later

Required application feature

The use of this function triggers the declaration of one application feature in the application generation wizard.

Required feature: Geolocation

This feature allows the applications to access the geolocation features found on the device or on the computer.

New in version 21

Required application feature

The use of this function triggers the declaration of one application feature in the application generation wizard.

Required feature: Geolocation

This feature allows the applications to access the geolocation features found on the device or on the computer.

Required application feature

The use of this function triggers the declaration of one application feature in the application generation wizard.

Required feature: Geolocation

This feature allows the applications to access the geolocation features found on the device or on the computer.

Related Examples:

Android (WINDEV Mobile): Android GPS

[ + ] This example presents the use of the GPS functions of WLanguage in an Android application.
It is used to retrieve at regular interval:
- The latitude
- The longitude
- The altitude
- The speed
- The direction

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 : wd250java.dll